diff --git a/examples/listdir.cc b/examples/listdir.cc
index 8864c78..5664582 100644
--- a/examples/listdir.cc
+++ b/examples/listdir.cc
@@ -1,5 +1,6 @@
 #include <ostd/io.hh>
 #include <ostd/filesystem.hh>
+#include <ostd/range.hh>
 
 using namespace ostd;
 
@@ -7,16 +8,19 @@ void list_dirs(ConstCharRange path, int off = 0) {
     DirectoryStream ds{path};
     /* iterate all items in directory */
     for (auto v: ds.iter()) {
-        if (v.type() != FileType::directory)
+        if (v.type() != FileType::directory) {
             continue;
-        for (int i = 0; i < off; ++i) write(' ');
+        }
+        for_each(range(off), [](int) { write(' '); });
         writeln(v.filename());
         list_dirs(v.path(), off + 1);
     }
 }
 
 int main(int argc, char **argv) {
-    if (argc < 1) return 1;
+    if (argc < 1) {
+        return 1;
+    }
     list_dirs(argv[1]);
     return 0;
 }
diff --git a/examples/range.cc b/examples/range.cc
index 2a08e04..5541ca9 100644
--- a/examples/range.cc
+++ b/examples/range.cc
@@ -7,19 +7,22 @@ using namespace ostd;
 int main() {
     /* range iter - prints 0 to 9 each on new line */
     writeln("range iter test");
-    for (int i: range(10))
+    for (int i: range(10)) {
         writeln(i);
+    }
 
     /* algorithm: map - prints 0.5 to 9.5 each on new line */
     writeln("range map test");
-    for (float f: map(range(10), [](int v) { return v + 0.5f; }))
+    for (float f: map(range(10), [](int v) { return v + 0.5f; })) {
         writeln(f);
+    }
 
     /* algorithm: filter - prints 10, 15, 8 each on new line */
     writeln("range filter test");
     auto il = { 5, 5, 5, 5, 5, 10, 15, 4, 8, 2 };
-    for (int i: filter(iter(il), [](int v) { return v > 5; }))
+    for (int i: filter(iter(il), [](int v) { return v > 5; })) {
         writeln(i);
+    }
 
     /* prints ABCDEF (ASCII 65, 66, 67, 68, 69, 70) */
     writeln("string gen test");
@@ -31,8 +34,9 @@ int main() {
     auto x = { 11, 22, 33 };
     auto y = { 44, 55, 66 };
     auto z = { 77, 88, 99 };
-    for (auto i: iter(x).join(iter(y), iter(z)))
+    for (auto i: iter(x).join(iter(y), iter(z))) {
         writeln(i);
+    }
 
     /* chunk a range into subranges - prints
      * {11, 22, 33}
@@ -41,21 +45,25 @@ int main() {
      */
     writeln("range chunk test");
     auto cr = { 11, 22, 33, 44, 55, 66, 77, 88, 99 };
-    for (auto r: iter(cr).chunks(3))
+    for (auto r: iter(cr).chunks(3)) {
         writeln(r);
+    }
 
     /* take test, prints only first 4 */
     writeln("range take test");
-    for (auto r: iter(cr).take(4))
+    for (auto r: iter(cr).take(4)) {
         writeln(r);
+    }
 
     /* {11, 44, 77}, {22, 55, 88}, {33, 66, 99} */
     writeln("range zip test");
-    for (auto v: iter(x).zip(iter(y), iter(z)))
+    for (auto v: iter(x).zip(iter(y), iter(z))) {
         writeln(v);
+    }
 
     /* 2-tuple zip uses Pair */
     writeln("2-tuple range zip");
-    for (auto v: iter({ 5, 10, 15, 20 }).zip(iter({ 6, 11, 16, 21 })))
+    for (auto v: iter({ 5, 10, 15, 20 }).zip(iter({ 6, 11, 16, 21 }))) {
         writeln(v.first, ", ", v.second);
+    }
 }
diff --git a/examples/range_pipe.cc b/examples/range_pipe.cc
index ddc434e..516de1e 100644
--- a/examples/range_pipe.cc
+++ b/examples/range_pipe.cc
@@ -10,14 +10,16 @@ using namespace ostd;
 int main() {
     /* algorithm: map - prints 0.5 to 9.5 each on new line */
     writeln("range map test");
-    for (float f: range(10) | map([](int v) { return v + 0.5f; }))
+    for (float f: range(10) | map([](int v) { return v + 0.5f; })) {
         writeln(f);
+    }
 
     /* algorithm: filter - prints 10, 15, 8 each on new line */
     writeln("range filter test");
     auto il = { 5, 5, 5, 5, 5, 10, 15, 4, 8, 2 };
-    for (int i: iter(il) | filter([](int v) { return v > 5; }))
+    for (int i: iter(il) | filter([](int v) { return v > 5; })) {
         writeln(i);
+    }
 
     /* prints ABCDEF (ASCII 65, 66, 67, 68, 69, 70) */
     writeln("string gen test");
@@ -29,8 +31,9 @@ int main() {
     auto x = { 11, 22, 33 };
     auto y = { 44, 55, 66 };
     auto z = { 77, 88, 99 };
-    for (auto i: iter(x) | join(iter(y), iter(z)))
+    for (auto i: iter(x) | join(iter(y), iter(z))) {
         writeln(i);
+    }
 
     /* chunk a range into subranges - prints
      * {11, 22, 33}
@@ -39,23 +42,27 @@ int main() {
      */
     writeln("range chunk test");
     auto cr = { 11, 22, 33, 44, 55, 66, 77, 88, 99 };
-    for (auto r: iter(cr) | chunks(3))
+    for (auto r: iter(cr) | chunks(3)) {
         writeln(r);
+    }
 
     /* take test, prints only first 4 */
     writeln("range take test");
-    for (auto r: iter(cr) | take(4))
+    for (auto r: iter(cr) | take(4)) {
         writeln(r);
+    }
 
     /* {11, 44, 77}, {22, 55, 88}, {33, 66, 99} */
     writeln("range zip test");
-    for (auto v: iter(x) | zip(iter(y), iter(z)))
+    for (auto v: iter(x) | zip(iter(y), iter(z))) {
         writeln(v);
+    }
 
     /* 2-tuple zip uses Pair */
     writeln("2-tuple range zip");
-    for (auto v: iter({ 5, 10, 15, 20 }) | zip(iter({ 6, 11, 16, 21 })))
+    for (auto v: iter({ 5, 10, 15, 20 }) | zip(iter({ 6, 11, 16, 21 }))) {
         writeln(v.first, ", ", v.second);
+    }
 
     /* more complex pipe */
     writeln("several piped algorithms");
@@ -65,16 +72,19 @@ int main() {
     generate(arr.iter(), []() { return rand() % 128; });
 
     auto r = arr.iter()
-        | sort()
+        | sort  ()
         | filter([](auto v) { return v >= 65 && v <= 90; })
-        |    map([](auto v) { return char(v); });
+        | map   ([](auto v) { return char(v); });
 
     writeln(String(r));
 
     /* "list comprehensions" */
     writeln("list initialization");
 
-    Vector<int> test(range(20) | filter([](int v) { return v % 2 == 0; })
-                               |    map([](int v) { return v * 2; }));
+    Vector<int> test(
+        range(20)
+            | filter([](int v) { return v % 2 == 0; })
+            | map   ([](int v) { return v * 2; })
+    );
     writeln(test);
 }
diff --git a/examples/signal.cc b/examples/signal.cc
index 4db7f91..8a5e70f 100644
--- a/examples/signal.cc
+++ b/examples/signal.cc
@@ -48,8 +48,9 @@ int main() {
     /* we can connect lambdas, including closures
      * this callback can access "test" easily and it will still work
      */
-    auto idx = st.on_simple.connect([&](SignalTest const &, int v,
-                                        ConstCharRange str) {
+    auto idx = st.on_simple.connect([&](
+        SignalTest const &, int v, ConstCharRange str
+    ) {
         writefln("and lambda test: %d, %s (%d)", v, str, test);
     });
 
@@ -69,13 +70,16 @@ int main() {
     /* the reference to SignalTest here is mutable */
     st.on_param.connect([](SignalTest &self, float oldval) {
         writeln("value changed...");
-        writefln("   old value: %f, new value: %f", oldval,
-            self.get_param());
+        writefln(
+            "   old value: %f, new value: %f", oldval, self.get_param()
+        );
 
         /* when we have a mutable reference we can change the original
          * object, for example re-emit its own signal once again
          */
-        if (self.get_param() > 140.0f) return;
+        if (self.get_param() > 140.0f) {
+            return;
+        }
         self.set_param(self.get_param() + 1.0f);
     });
 
diff --git a/examples/stream1.cc b/examples/stream1.cc
index 50e4f93..07e0329 100644
--- a/examples/stream1.cc
+++ b/examples/stream1.cc
@@ -9,14 +9,18 @@ void print_result(Uint32 x) {
 
 int main() {
     FileStream wtest{"test.bin", StreamMode::write};
-    copy(iter({ 0xABCD1214, 0xBADC3264, 0xDEADBEEF, 0xBEEFDEAD }), wtest.iter<Uint32>());
+    copy(
+        iter({ 0xABCD1214, 0xBADC3264, 0xDEADBEEF, 0xBEEFDEAD }),
+        wtest.iter<Uint32>()
+    );
     wtest.close();
 
     FileStream rtest{"test.bin"};
     writefln("stream size: %d", rtest.size());
 
-    for (Uint32 x: map(rtest.iter<Uint32>(), FromBigEndian<Uint32>()))
+    for (Uint32 x: map(rtest.iter<Uint32>(), FromBigEndian<Uint32>())) {
         print_result(x);
+    }
 
     return 0;
 }
diff --git a/examples/stream2.cc b/examples/stream2.cc
index ba6f709..3592adc 100644
--- a/examples/stream2.cc
+++ b/examples/stream2.cc
@@ -9,12 +9,13 @@ int main() {
 
     FileStream wtest{"test.txt", StreamMode::write};
 
-    String smpl = "This is a test file for later read.\n"
-                  "It contains some sample text in order to see whether "
-                  "things actually read correctly.\n\n\n"
-                  ""
-                  "This is after a few newlines. The file continues here.\n"
-                  "The file ends here.\n";
+    String smpl = 
+        "This is a test file for later read.\n"
+        "It contains some sample text in order to see whether "
+        "things actually read correctly.\n\n\n"
+        ""
+        "This is after a few newlines. The file continues here.\n"
+        "The file ends here.\n";
 
     copy(smpl.iter(), wtest.iter());
     wtest.close();
diff --git a/ostd/algorithm.hh b/ostd/algorithm.hh
index 34c0743..5b03657 100644
--- a/ostd/algorithm.hh
+++ b/ostd/algorithm.hh
@@ -39,8 +39,11 @@ inline auto partition(F &&func) {
 template<typename R, typename P>
 inline bool is_partitioned(R range, P pred) {
     for (; !range.empty() && pred(range.front()); range.pop_front());
-    for (; !range.empty(); range.pop_front())
-        if (pred(range.front())) return false;
+    for (; !range.empty(); range.pop_front()) {
+        if (pred(range.front())) {
+            return false;
+        }
+    }
     return true;
 }
 
@@ -69,20 +72,25 @@ namespace detail {
     }
 
     template<typename R, typename C>
-    static void hs_sift_down(R range, RangeSize<R> s,
-                             RangeSize<R> e, C &compare) {
+    static void hs_sift_down(
+        R range, RangeSize<R> s, RangeSize<R> e, C &compare
+    ) {
         RangeSize<R> r = s;
         while ((r * 2 + 1) <= e) {
             RangeSize<R> ch = r * 2 + 1;
             RangeSize<R> sw = r;
-            if (compare(range[sw], range[ch]))
+            if (compare(range[sw], range[ch])) {
                 sw = ch;
-            if (((ch + 1) <= e) && compare(range[sw], range[ch + 1]))
+            }
+            if (((ch + 1) <= e) && compare(range[sw], range[ch + 1])) {
                 sw = ch + 1;
+            }
             if (sw != r) {
                 detail::swap_adl(range[r], range[sw]);
                 r = sw;
-            } else return;
+            } else {
+                return;
+            }
         }
     }
 
@@ -92,7 +100,9 @@ namespace detail {
         RangeSize<R> st = (len - 2) / 2;
         for (;;) {
             detail::hs_sift_down(range, st, len - 1, compare);
-            if (st-- == 0) break;
+            if (st-- == 0) {
+                break;
+            }
         }
         RangeSize<R> e = len - 1;
         while (e > 0) {
@@ -117,19 +127,23 @@ namespace detail {
         R pr = range;
         pr.pop_back();
         for (; !pr.empty(); pr.pop_front()) {
-            if (compare(pr.front(), range.back()))
+            if (compare(pr.front(), range.back())) {
                 detail::swap_adl(pr.front(), range[pi++]);
+            }
         }
         detail::swap_adl(range[pi], range.back());
         detail::introloop(range.slice(0, pi), compare, depth - 1);
-        detail::introloop(range.slice(pi + 1, range.size()), compare,
-            depth - 1);
+        detail::introloop(
+            range.slice(pi + 1, range.size()), compare, depth - 1
+        );
     }
 
     template<typename R, typename C>
     inline void introsort(R range, C &compare) {
-        detail::introloop(range, compare, RangeSize<R>(2
-            * (log(range.size()) / log(2))));
+        detail::introloop(
+            range, compare,
+            static_cast<RangeSize<R>>(2 * (log(range.size()) / log(2)))
+        );
     }
 } /* namespace detail */
 
@@ -176,17 +190,21 @@ inline T const &max_cmp(T const &a, T const &b, C compare) {
 template<typename R>
 inline R min_element(R range) {
     R r = range;
-    for (; !range.empty(); range.pop_front())
-        if (ostd::min(r.front(), range.front()) == range.front())
+    for (; !range.empty(); range.pop_front()) {
+        if (ostd::min(r.front(), range.front()) == range.front()) {
             r = range;
+        }
+    }
     return r;
 }
 template<typename R, typename C>
 inline R min_element_cmp(R range, C compare) {
     R r = range;
-    for (; !range.empty(); range.pop_front())
-        if (ostd::min_cmp(r.front(), range.front(), compare) == range.front())
+    for (; !range.empty(); range.pop_front()) {
+        if (ostd::min_cmp(r.front(), range.front(), compare) == range.front()) {
             r = range;
+        }
+    }
     return r;
 }
 inline auto min_element() {
@@ -202,17 +220,21 @@ inline auto min_element_cmp(C &&compare) {
 template<typename R>
 inline R max_element(R range) {
     R r = range;
-    for (; !range.empty(); range.pop_front())
-        if (ostd::max(r.front(), range.front()) == range.front())
+    for (; !range.empty(); range.pop_front()) {
+        if (ostd::max(r.front(), range.front()) == range.front()) {
             r = range;
+        }
+    }
     return r;
 }
 template<typename R, typename C>
 inline R max_element_cmp(R range, C compare) {
     R r = range;
-    for (; !range.empty(); range.pop_front())
-        if (ostd::max_cmp(r.front(), range.front(), compare) == range.front())
+    for (; !range.empty(); range.pop_front()) {
+        if (ostd::max_cmp(r.front(), range.front(), compare) == range.front()) {
             r = range;
+        }
+    }
     return r;
 }
 inline auto max_element() {
@@ -261,8 +283,12 @@ inline T clamp(T const &v, U const &lo, U const &hi, C compare) {
 template<typename R1, typename R2>
 inline bool lexicographical_compare(R1 range1, R2 range2) {
     while (!range1.empty() && !range2.empty()) {
-        if (range1.front() < range2.front()) return true;
-        if (range2.front() < range1.front()) return false;
+        if (range1.front() < range2.front()) {
+            return true;
+        }
+        if (range2.front() < range1.front()) {
+            return false;
+        }
         range1.pop_front();
         range2.pop_front();
     }
@@ -271,15 +297,21 @@ inline bool lexicographical_compare(R1 range1, R2 range2) {
 template<typename R>
 inline auto lexicographical_compare(R &&range) {
     return [range = forward<R>(range)](auto &&obj) mutable {
-        return lexicographical_compare(forward<decltype(obj)>(obj), forward<R>(range));
+        return lexicographical_compare(
+            forward<decltype(obj)>(obj), forward<R>(range)
+        );
     };
 }
 
 template<typename R1, typename R2, typename C>
 inline bool lexicographical_compare_cmp(R1 range1, R2 range2, C compare) {
     while (!range1.empty() && !range2.empty()) {
-        if (compare(range1.front(), range2.front())) return true;
-        if (compare(range2.front(), range1.front())) return false;
+        if (compare(range1.front(), range2.front())) {
+            return true;
+        }
+        if (compare(range2.front(), range1.front())) {
+            return false;
+        }
         range1.pop_front();
         range2.pop_front();
     }
@@ -287,9 +319,12 @@ inline bool lexicographical_compare_cmp(R1 range1, R2 range2, C compare) {
 }
 template<typename R, typename C>
 inline auto lexicographical_compare_cmp(R &&range, C &&compare) {
-    return [range = forward<R>(range), compare = forward<C>(compare)](auto &&obj) mutable {
-        return lexicographical_compare_cmp(forward<decltype(obj)>(obj),
-            forward<R>(range), forward<C>(compare));
+    return [
+        range = forward<R>(range), compare = forward<C>(compare)
+    ](auto &&obj) mutable {
+        return lexicographical_compare_cmp(
+            forward<decltype(obj)>(obj), forward<R>(range), forward<C>(compare)
+        );
     };
 }
 
@@ -297,8 +332,9 @@ inline auto lexicographical_compare_cmp(R &&range, C &&compare) {
 
 template<typename R, typename F>
 inline F for_each(R range, F func) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         func(range.front());
+    }
     return move(func);
 }
 
@@ -311,8 +347,11 @@ inline auto for_each(F &&func) {
 
 template<typename R, typename P>
 inline bool all_of(R range, P pred) {
-    for (; !range.empty(); range.pop_front())
-        if (!pred(range.front())) return false;
+    for (; !range.empty(); range.pop_front()) {
+        if (!pred(range.front())) {
+            return false;
+        }
+    }
     return true;
 }
 
@@ -353,9 +392,11 @@ inline auto none_of(F &&func) {
 
 template<typename R, typename T>
 inline R find(R range, T const &v) {
-    for (; !range.empty(); range.pop_front())
-        if (range.front() == v)
+    for (; !range.empty(); range.pop_front()) {
+        if (range.front() == v) {
             break;
+        }
+    }
     return range;
 }
 
@@ -369,13 +410,16 @@ inline auto find(T &&v) {
 template<typename R, typename T>
 inline R find_last(R range, T const &v) {
     range = find(range, v);
-    if (!range.empty()) for (;;) {
-        R prev = range;
-        prev.pop_front();
-        R r = find(prev, v);
-        if (r.empty())
-            break;
-        range = r;
+    if (!range.empty()) {
+        for (;;) {
+            R prev = range;
+            prev.pop_front();
+            R r = find(prev, v);
+            if (r.empty()) {
+                break;
+            }
+            range = r;
+        }
     }
     return range;
 }
@@ -389,9 +433,11 @@ inline auto find_last(T &&v) {
 
 template<typename R, typename P>
 inline R find_if(R range, P pred) {
-    for (; !range.empty(); range.pop_front())
-        if (pred(range.front()))
+    for (; !range.empty(); range.pop_front()) {
+        if (pred(range.front())) {
             break;
+        }
+    }
     return range;
 }
 
@@ -404,9 +450,11 @@ inline auto find_if(F &&func) {
 
 template<typename R, typename P>
 inline R find_if_not(R range, P pred) {
-    for (; !range.empty(); range.pop_front())
-        if (!pred(range.front()))
+    for (; !range.empty(); range.pop_front()) {
+        if (!pred(range.front())) {
             break;
+        }
+    }
     return range;
 }
 
@@ -419,26 +467,35 @@ inline auto find_if_not(F &&func) {
 
 template<typename R1, typename R2, typename C>
 inline R1 find_one_of_cmp(R1 range, R2 values, C compare) {
-    for (; !range.empty(); range.pop_front())
-        for (R2 rv = values; !rv.empty(); rv.pop_front())
-            if (compare(range.front(), rv.front()))
+    for (; !range.empty(); range.pop_front()) {
+        for (R2 rv = values; !rv.empty(); rv.pop_front()) {
+            if (compare(range.front(), rv.front())) {
                 return range;
+            }
+        }
+    }
     return range;
 }
 template<typename R, typename C>
 inline auto find_one_of_cmp(R &&values, C &&compare) {
-    return [values = forward<R>(values), compare = forward<C>(compare)](auto &&obj) mutable {
-        return find_one_of_cmp(forward<decltype(obj)>(obj),
-            forward<R>(values), forward<C>(compare));
+    return [
+        values = forward<R>(values), compare = forward<C>(compare)
+    ](auto &&obj) mutable {
+        return find_one_of_cmp(
+            forward<decltype(obj)>(obj), forward<R>(values), forward<C>(compare)
+        );
     };
 }
 
 template<typename R1, typename R2>
 inline R1 find_one_of(R1 range, R2 values) {
-    for (; !range.empty(); range.pop_front())
-        for (R2 rv = values; !rv.empty(); rv.pop_front())
-            if (range.front() == rv.front())
+    for (; !range.empty(); range.pop_front()) {
+        for (R2 rv = values; !rv.empty(); rv.pop_front()) {
+            if (range.front() == rv.front()) {
                 return range;
+            }
+        }
+    }
     return range;
 }
 template<typename R>
@@ -451,9 +508,11 @@ inline auto find_one_of(R &&values) {
 template<typename R, typename T>
 inline RangeSize<R> count(R range, T const &v) {
     RangeSize<R> ret = 0;
-    for (; !range.empty(); range.pop_front())
-        if (range.front() == v)
+    for (; !range.empty(); range.pop_front()) {
+        if (range.front() == v) {
             ++ret;
+        }
+    }
     return ret;
 }
 
@@ -467,9 +526,11 @@ inline auto count(T &&v) {
 template<typename R, typename P>
 inline RangeSize<R> count_if(R range, P pred) {
     RangeSize<R> ret = 0;
-    for (; !range.empty(); range.pop_front())
-        if (pred(range.front()))
+    for (; !range.empty(); range.pop_front()) {
+        if (pred(range.front())) {
             ++ret;
+        }
+    }
     return ret;
 }
 
@@ -483,9 +544,11 @@ inline auto count_if(F &&func) {
 template<typename R, typename P>
 inline RangeSize<R> count_if_not(R range, P pred) {
     RangeSize<R> ret = 0;
-    for (; !range.empty(); range.pop_front())
-        if (!pred(range.front()))
+    for (; !range.empty(); range.pop_front()) {
+        if (!pred(range.front())) {
             ++ret;
+        }
+    }
     return ret;
 }
 
@@ -499,8 +562,9 @@ inline auto count_if_not(F &&func) {
 template<typename R>
 inline bool equal(R range1, R range2) {
     for (; !range1.empty(); range1.pop_front()) {
-        if (range2.empty() || (range1.front() != range2.front()))
+        if (range2.empty() || (range1.front() != range2.front())) {
             return false;
+        }
         range2.pop_front();
     }
     return range2.empty();
@@ -529,31 +593,37 @@ inline auto slice_until(R &&range) {
 
 template<typename R1, typename R2>
 inline R2 copy(R1 irange, R2 orange) {
-    for (; !irange.empty(); irange.pop_front())
+    for (; !irange.empty(); irange.pop_front()) {
         orange.put(irange.front());
+    }
     return orange;
 }
 
 template<typename R1, typename R2, typename P>
 inline R2 copy_if(R1 irange, R2 orange, P pred) {
-    for (; !irange.empty(); irange.pop_front())
-        if (pred(irange.front()))
+    for (; !irange.empty(); irange.pop_front()) {
+        if (pred(irange.front())) {
             orange.put(irange.front());
+        }
+    }
     return orange;
 }
 
 template<typename R1, typename R2, typename P>
 inline R2 copy_if_not(R1 irange, R2 orange, P pred) {
-    for (; !irange.empty(); irange.pop_front())
-        if (!pred(irange.front()))
+    for (; !irange.empty(); irange.pop_front()) {
+        if (!pred(irange.front())) {
             orange.put(irange.front());
+        }
+    }
     return orange;
 }
 
 template<typename R1, typename R2>
 inline R2 move(R1 irange, R2 orange) {
-    for (; !irange.empty(); irange.pop_front())
+    for (; !irange.empty(); irange.pop_front()) {
         orange.put(move(irange.front()));
+    }
     return orange;
 }
 
@@ -568,21 +638,24 @@ inline void reverse(R range) {
 
 template<typename R1, typename R2>
 inline R2 reverse_copy(R1 irange, R2 orange) {
-    for (; !irange.empty(); irange.pop_back())
+    for (; !irange.empty(); irange.pop_back()) {
         orange.put(irange.back());
+    }
     return orange;
 }
 
 template<typename R, typename T>
 inline void fill(R range, T const &v) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         range.front() = v;
+    }
 }
 
 template<typename R, typename F>
 inline void generate(R range, F gen) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         range.front() = gen();
+    }
 }
 
 template<typename R1, typename R2>
@@ -597,21 +670,24 @@ inline Pair<R1, R2> swap_ranges(R1 range1, R2 range2) {
 
 template<typename R, typename T>
 inline void iota(R range, T value) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         range.front() = value++;
+    }
 }
 
 template<typename R, typename T>
 inline T foldl(R range, T init) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         init = init + range.front();
+    }
     return init;
 }
 
 template<typename R, typename T, typename F>
 inline T foldl_f(R range, T init, F func) {
-    for (; !range.empty(); range.pop_front())
+    for (; !range.empty(); range.pop_front()) {
         init = func(init, range.front());
+    }
     return init;
 }
 
@@ -623,22 +699,28 @@ inline auto foldl(T &&init) {
 }
 template<typename T, typename F>
 inline auto foldl_f(T &&init, F &&func) {
-    return [init = forward<T>(init), func = forward<F>(func)](auto &&obj) mutable {
-        return foldl_f(forward<decltype(obj)>(obj), forward<T>(init), forward<F>(func));
+    return [
+        init = forward<T>(init), func = forward<F>(func)
+    ](auto &&obj) mutable {
+        return foldl_f(
+            forward<decltype(obj)>(obj), forward<T>(init), forward<F>(func)
+        );
     };
 }
 
 template<typename R, typename T>
 inline T foldr(R range, T init) {
-    for (; !range.empty(); range.pop_back())
+    for (; !range.empty(); range.pop_back()) {
         init = init + range.back();
+    }
     return init;
 }
 
 template<typename R, typename T, typename F>
 inline T foldr_f(R range, T init, F func) {
-    for (; !range.empty(); range.pop_back())
+    for (; !range.empty(); range.pop_back()) {
         init = func(init, range.back());
+    }
     return init;
 }
 
@@ -650,8 +732,12 @@ inline auto foldr(T &&init) {
 }
 template<typename T, typename F>
 inline auto foldr_f(T &&init, F &&func) {
-    return [init = forward<T>(init), func = forward<F>(func)](auto &&obj) mutable {
-        return foldr_f(forward<decltype(obj)>(obj), forward<T>(init), forward<F>(func));
+    return [
+        init = forward<T>(init), func = forward<F>(func)
+    ](auto &&obj) mutable {
+        return foldr_f(
+            forward<decltype(obj)>(obj), forward<T>(init), forward<F>(func)
+        );
     };
 }
 
@@ -734,8 +820,8 @@ public:
 };
 
 namespace detail {
-    template<typename R, typename F> using MapReturnType
-        = decltype(declval<F>()(declval<RangeReference<R>>()));
+    template<typename R, typename F>
+    using MapReturnType = decltype(declval<F>()(declval<RangeReference<R>>()));
 }
 
 template<typename R, typename F>
@@ -760,22 +846,27 @@ private:
     Decay<F> p_pred;
 
     void advance_valid() {
-        while (!p_range.empty() && !p_pred(front())) p_range.pop_front();
+        while (!p_range.empty() && !p_pred(front())) {
+            p_range.pop_front();
+        }
     }
 
 public:
     FilterRange() = delete;
     template<typename P>
-    FilterRange(T const &range, P &&pred): p_range(range),
-    p_pred(forward<P>(pred)) {
+    FilterRange(T const &range, P &&pred):
+        p_range(range), p_pred(forward<P>(pred))
+    {
         advance_valid();
     }
-    FilterRange(FilterRange const &it): p_range(it.p_range),
-    p_pred(it.p_pred) {
+    FilterRange(FilterRange const &it):
+        p_range(it.p_range), p_pred(it.p_pred)
+    {
         advance_valid();
     }
-    FilterRange(FilterRange &&it): p_range(move(it.p_range)),
-    p_pred(move(it.p_pred)) {
+    FilterRange(FilterRange &&it):
+        p_range(move(it.p_range)), p_pred(move(it.p_pred))
+    {
         advance_valid();
     }
 
@@ -808,10 +899,10 @@ public:
 };
 
 namespace detail {
-    template<typename R, typename P> using FilterPred
-        = EnableIf<IsSame<
-            decltype(declval<P>()(declval<RangeReference<R>>())), bool
-        >, P>;
+    template<typename R, typename P>
+    using FilterPred = EnableIf<
+        IsSame<decltype(declval<P>()(declval<RangeReference<R>>())), bool>, P
+    >;
 }
 
 template<typename R, typename P>
diff --git a/ostd/array.hh b/ostd/array.hh
index e7d7ea1..e5503d7 100644
--- a/ostd/array.hh
+++ b/ostd/array.hh
@@ -31,11 +31,15 @@ struct Array {
     T const &operator[](Size i) const { return p_buf[i]; }
 
     T *at(Size i) {
-        if (!in_range(i)) return nullptr;
+        if (!in_range(i)) {
+            return nullptr;
+        }
         return &p_buf[i];
     }
     T const *at(Size i) const {
-        if (!in_range(i)) return nullptr;
+        if (!in_range(i)) {
+            return nullptr;
+        }
         return &p_buf[i];
     }
 
diff --git a/ostd/atomic.hh b/ostd/atomic.hh
index a6b4471..12c844a 100644
--- a/ostd/atomic.hh
+++ b/ostd/atomic.hh
@@ -31,7 +31,8 @@ namespace detail {
         T p_value;
     };
 
-    template<typename T> T atomic_create();
+    template<typename T>
+    T atomic_create();
 
     template<typename T, typename U>
     EnableIf<sizeof(T()->value = atomic_create<U>()), char>
@@ -41,8 +42,8 @@ namespace detail {
     int test_atomic_assignable(...);
 
     template<typename T, typename U>
-    constexpr bool CanAtomicAssign
-        = (sizeof(test_atomic_assignable<T, U>(1)) == sizeof(char));
+    constexpr bool CanAtomicAssign =
+        (sizeof(test_atomic_assignable<T, U>(1)) == sizeof(char));
 
     template<typename T>
     static inline EnableIf<
@@ -59,7 +60,9 @@ namespace detail {
         char volatile *to  = reinterpret_cast<char volatile *>(&a->p_value);
         char volatile *end = to + sizeof(T);
         char *from = reinterpret_cast<char *>(&v);
-        while (to != end) *to++ =*from++;
+        while (to != end) {
+            *to++ =*from++;
+        }
     }
 
     template<typename T>
@@ -88,21 +91,25 @@ static constexpr Size AtomicPointerLockFree = __GCC_ATOMIC_POINTER_LOCK_FREE;
 
 namespace detail {
     static inline constexpr int to_gcc_order(MemoryOrder ord) {
-        return ((ord == MemoryOrder::relaxed) ? __ATOMIC_RELAXED :
-               ((ord == MemoryOrder::acquire) ? __ATOMIC_ACQUIRE :
-               ((ord == MemoryOrder::release) ? __ATOMIC_RELEASE :
-               ((ord == MemoryOrder::seq_cst) ? __ATOMIC_SEQ_CST :
-               ((ord == MemoryOrder::acq_rel) ? __ATOMIC_ACQ_REL :
-                                                __ATOMIC_CONSUME)))));
+        return (
+            ((ord == MemoryOrder::relaxed) ? __ATOMIC_RELAXED :
+            ((ord == MemoryOrder::acquire) ? __ATOMIC_ACQUIRE :
+            ((ord == MemoryOrder::release) ? __ATOMIC_RELEASE :
+            ((ord == MemoryOrder::seq_cst) ? __ATOMIC_SEQ_CST :
+            ((ord == MemoryOrder::acq_rel) ? __ATOMIC_ACQ_REL :
+                                              __ATOMIC_CONSUME)))))
+        );
     }
 
     static inline constexpr int to_gcc_failure_order(MemoryOrder ord) {
-        return ((ord == MemoryOrder::relaxed) ? __ATOMIC_RELAXED :
-               ((ord == MemoryOrder::acquire) ? __ATOMIC_ACQUIRE :
-               ((ord == MemoryOrder::release) ? __ATOMIC_RELAXED :
-               ((ord == MemoryOrder::seq_cst) ? __ATOMIC_SEQ_CST :
-               ((ord == MemoryOrder::acq_rel) ? __ATOMIC_ACQUIRE :
-                                                __ATOMIC_CONSUME)))));
+        return (
+            ((ord == MemoryOrder::relaxed) ? __ATOMIC_RELAXED :
+            ((ord == MemoryOrder::acquire) ? __ATOMIC_ACQUIRE :
+            ((ord == MemoryOrder::release) ? __ATOMIC_RELAXED :
+            ((ord == MemoryOrder::seq_cst) ? __ATOMIC_SEQ_CST :
+            ((ord == MemoryOrder::acq_rel) ? __ATOMIC_ACQUIRE :
+                                             __ATOMIC_CONSUME)))))
+        );
     }
 
     static inline void atomic_thread_fence(MemoryOrder ord) {
@@ -119,8 +126,9 @@ namespace detail {
     }
 
     template<typename T>
-    static inline void atomic_store(AtomicBase<T> volatile *a,
-                                    T v, MemoryOrder ord) {
+    static inline void atomic_store(
+        AtomicBase<T> volatile *a, T v, MemoryOrder ord
+    ) {
         __atomic_store(&a->p_value, &v, to_gcc_order(ord));
     }
 
@@ -163,8 +171,10 @@ namespace detail {
         AtomicBase<T> volatile *a, T *expected, T v,
         MemoryOrder success, MemoryOrder failure
     ) {
-        return __atomic_compare_exchange(&a->p_value, expected, &v, false,
-            to_gcc_order(success), to_gcc_failure_order(failure));
+        return __atomic_compare_exchange(
+            &a->p_value, expected, &v, false,
+            to_gcc_order(success), to_gcc_failure_order(failure)
+        );
     }
 
     template<typename T>
@@ -172,8 +182,10 @@ namespace detail {
         AtomicBase<T> *a, T *expected, T v,
         MemoryOrder success, MemoryOrder failure
     ) {
-        return __atomic_compare_exchange(&a->p_value, expected, &v, false,
-            to_gcc_order(success), to_gcc_failure_order(failure));
+        return __atomic_compare_exchange(
+            &a->p_value, expected, &v, false,
+            to_gcc_order(success), to_gcc_failure_order(failure)
+        );
     }
 
     template<typename T>
@@ -181,8 +193,10 @@ namespace detail {
         AtomicBase<T> volatile *a, T *expected, T v,
         MemoryOrder success, MemoryOrder failure
     ) {
-        return __atomic_compare_exchange(&a->p_value, expected, &v, true,
-            to_gcc_order(success), to_gcc_failure_order(failure));
+        return __atomic_compare_exchange(
+            &a->p_value, expected, &v, true,
+            to_gcc_order(success), to_gcc_failure_order(failure)
+        );
     }
 
     template<typename T>
@@ -190,8 +204,10 @@ namespace detail {
         AtomicBase<T> *a, T *expected, T v,
         MemoryOrder success, MemoryOrder failure
     ) {
-        return __atomic_compare_exchange(&a->p_value, expected, &v, true,
-            to_gcc_order(success), to_gcc_failure_order(failure));
+        return __atomic_compare_exchange(
+            &a->p_value, expected, &v, true,
+            to_gcc_order(success), to_gcc_failure_order(failure)
+        );
     }
 
     template<typename T>
@@ -200,84 +216,96 @@ namespace detail {
     template<typename T>
     struct SkipAmt<T *> { static constexpr Size value = sizeof(T); };
 
-    template<typename T> struct SkipAmt<T[]> {};
-    template<typename T, Size N> struct SkipAmt<T[N]> {};
+    template<typename T>
+    struct SkipAmt<T[]> {};
+
+    template<typename T, Size N>
+    struct SkipAmt<T[N]> {};
 
     template<typename T, typename U>
-    static inline T atomic_fetch_add(AtomicBase<T> volatile *a,
-                                     U d, MemoryOrder ord) {
-        return __atomic_fetch_add(&a->p_value, d * SkipAmt<T>::value,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_add(
+        AtomicBase<T> volatile *a, U d, MemoryOrder ord
+    ) {
+        return __atomic_fetch_add(
+            &a->p_value, d * SkipAmt<T>::value, to_gcc_order(ord)
+        );
     }
 
     template<typename T, typename U>
-    static inline T atomic_fetch_add(AtomicBase<T> *a,
-                                     U d, MemoryOrder ord) {
-        return __atomic_fetch_add(&a->p_value, d * SkipAmt<T>::value,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_add(
+        AtomicBase<T> *a, U d, MemoryOrder ord
+    ) {
+        return __atomic_fetch_add(
+            &a->p_value, d * SkipAmt<T>::value, to_gcc_order(ord)
+        );
     }
 
     template<typename T, typename U>
-    static inline T atomic_fetch_sub(AtomicBase<T> volatile *a,
-                                     U d, MemoryOrder ord) {
-        return __atomic_fetch_sub(&a->p_value, d * SkipAmt<T>::value,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_sub(
+        AtomicBase<T> volatile *a, U d, MemoryOrder ord
+    ) {
+        return __atomic_fetch_sub(
+            &a->p_value, d * SkipAmt<T>::value, to_gcc_order(ord)
+        );
     }
 
     template<typename T, typename U>
-    static inline T atomic_fetch_sub(AtomicBase<T> *a,
-                                     U d, MemoryOrder ord) {
-        return __atomic_fetch_sub(&a->p_value, d * SkipAmt<T>::value,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_sub(
+        AtomicBase<T> *a, U d, MemoryOrder ord
+    ) {
+        return __atomic_fetch_sub(
+            &a->p_value, d * SkipAmt<T>::value, to_gcc_order(ord)
+        );
     }
 
     template<typename T>
-    static inline T atomic_fetch_and(AtomicBase<T> volatile *a,
-                                     T pattern, MemoryOrder ord) {
-        return __atomic_fetch_and(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_and(
+        AtomicBase<T> volatile *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_and(&a->p_value, pattern, to_gcc_order(ord));
     }
 
     template<typename T>
-    static inline T atomic_fetch_and(AtomicBase<T> *a,
-                                     T pattern, MemoryOrder ord) {
-        return __atomic_fetch_and(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_and(
+        AtomicBase<T> *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_and(&a->p_value, pattern, to_gcc_order(ord));
     }
 
     template<typename T>
-    static inline T atomic_fetch_or(AtomicBase<T> volatile *a,
-                                    T pattern, MemoryOrder ord) {
-        return __atomic_fetch_or(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_or(
+        AtomicBase<T> volatile *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_or(&a->p_value, pattern, to_gcc_order(ord));
     }
 
     template<typename T>
-    static inline T atomic_fetch_or(AtomicBase<T> *a,
-                                    T pattern, MemoryOrder ord) {
-        return __atomic_fetch_or(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_or(
+        AtomicBase<T> *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_or(&a->p_value, pattern, to_gcc_order(ord));
     }
 
     template<typename T>
-    static inline T atomic_fetch_xor(AtomicBase<T> volatile *a,
-                                     T pattern, MemoryOrder ord) {
-        return __atomic_fetch_xor(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_xor(
+        AtomicBase<T> volatile *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_xor(&a->p_value, pattern, to_gcc_order(ord));
     }
 
     template<typename T>
-    static inline T atomic_fetch_xor(AtomicBase<T> *a,
-                                     T pattern, MemoryOrder ord) {
-        return __atomic_fetch_xor(&a->p_value, pattern,
-            to_gcc_order(ord));
+    static inline T atomic_fetch_xor(
+        AtomicBase<T> *a, T pattern, MemoryOrder ord
+    ) {
+        return __atomic_fetch_xor(&a->p_value, pattern, to_gcc_order(ord));
     }
 } /* namespace detail */
 #else
 # error Unsupported compiler
 #endif
 
-template <typename T> inline T kill_dependency(T v) {
+template <typename T>
+inline T kill_dependency(T v) {
     return v;
 }
 
@@ -330,45 +358,47 @@ namespace detail {
             return atomic_exchange(&p_a, v, ord);
         }
 
-        bool compare_exchange_weak(T &e, T v, MemoryOrder s,
-                                   MemoryOrder f) volatile {
+        bool compare_exchange_weak(
+            T &e, T v, MemoryOrder s, MemoryOrder f
+        ) volatile {
             return atomic_compare_exchange_weak(&p_a, &e, v, s, f);
         }
 
-        bool compare_exchange_weak(T &e, T v, MemoryOrder s,
-                                   MemoryOrder f) {
+        bool compare_exchange_weak(T &e, T v, MemoryOrder s, MemoryOrder f) {
             return atomic_compare_exchange_weak(&p_a, &e, v, s, f);
         }
 
-        bool compare_exchange_strong(T &e, T v, MemoryOrder s,
-                                     MemoryOrder f) volatile {
+        bool compare_exchange_strong(
+            T &e, T v, MemoryOrder s, MemoryOrder f
+        ) volatile {
             return atomic_compare_exchange_strong(&p_a, &e, v, s, f);
         }
 
-        bool compare_exchange_strong(T &e, T v, MemoryOrder s,
-                                     MemoryOrder f) {
+        bool compare_exchange_strong(T &e, T v, MemoryOrder s, MemoryOrder f) {
             return atomic_compare_exchange_strong(&p_a, &e, v, s, f);
         }
 
-        bool compare_exchange_weak(T &e, T v, MemoryOrder ord
-                                                  = MemoryOrder::seq_cst)
-        volatile {
+        bool compare_exchange_weak(
+            T &e, T v, MemoryOrder ord = MemoryOrder::seq_cst
+        ) volatile {
             return atomic_compare_exchange_weak(&p_a, &e, v, ord, ord);
         }
 
-        bool compare_exchange_weak(T &e, T v, MemoryOrder ord
-                                                  = MemoryOrder::seq_cst) {
+        bool compare_exchange_weak(
+            T &e, T v, MemoryOrder ord = MemoryOrder::seq_cst
+        ) {
             return atomic_compare_exchange_weak(&p_a, &e, v, ord, ord);
         }
 
-        bool compare_exchange_strong(T &e, T v, MemoryOrder ord
-                                                    = MemoryOrder::seq_cst)
-        volatile {
+        bool compare_exchange_strong(
+            T &e, T v, MemoryOrder ord = MemoryOrder::seq_cst
+        ) volatile {
             return atomic_compare_exchange_strong(&p_a, &e, v, ord, ord);
         }
 
-        bool compare_exchange_strong(T &e, T v, MemoryOrder ord
-                                                    = MemoryOrder::seq_cst) {
+        bool compare_exchange_strong(
+            T &e, T v, MemoryOrder ord = MemoryOrder::seq_cst
+        ) {
             return atomic_compare_exchange_strong(&p_a, &e, v, ord, ord);
         }
     };
@@ -421,10 +451,10 @@ namespace detail {
             return atomic_fetch_xor(&this->p_a, op, ord);
         }
 
-        T operator++(int) volatile { return fetch_add(T(1));         }
-        T operator++(int)          { return fetch_add(T(1));         }
-        T operator--(int) volatile { return fetch_sub(T(1));         }
-        T operator--(int)          { return fetch_sub(T(1));         }
+        T operator++(int) volatile { return fetch_add(T(1));        }
+        T operator++(int)          { return fetch_add(T(1));        }
+        T operator--(int) volatile { return fetch_sub(T(1));        }
+        T operator--(int)          { return fetch_sub(T(1));        }
         T operator++(   ) volatile { return fetch_add(T(1)) + T(1); }
         T operator++(   )          { return fetch_add(T(1)) + T(1); }
         T operator--(   ) volatile { return fetch_sub(T(1)) - T(1); }
@@ -581,20 +611,17 @@ inline T atomic_exchange(Atomic<T> *a, T v) {
 }
 
 template <typename T>
-inline T atomic_exchange_explicit(Atomic<T> volatile *a, T v,
-                                  MemoryOrder ord) {
+inline T atomic_exchange_explicit(Atomic<T> volatile *a, T v, MemoryOrder ord) {
     return a->exchange(v, ord);
 }
 
 template <typename T>
-inline T atomic_exchange_explicit(Atomic<T> *a, T v,
-                                   MemoryOrder ord) {
+inline T atomic_exchange_explicit(Atomic<T> *a, T v, MemoryOrder ord) {
     return a->exchange(v, ord);
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_weak(Atomic<T> volatile *a,
-                                         T *e, T v) {
+inline bool atomic_compare_exchange_weak(Atomic<T> volatile *a, T *e, T v) {
     return a->compare_exchange_weak(*e, v);
 }
 
@@ -604,8 +631,7 @@ inline bool atomic_compare_exchange_weak(Atomic<T> *a, T *e, T v) {
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_strong(Atomic<T> volatile *a,
-                                           T *e, T v) {
+inline bool atomic_compare_exchange_strong(Atomic<T> volatile *a, T *e, T v) {
     return a->compare_exchange_strong(*e, v);
 }
 
@@ -615,46 +641,44 @@ inline bool atomic_compare_exchange_strong(Atomic<T> *a, T *e, T v) {
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_weak_explicit(Atomic<T> volatile *a,
-                                                  T *e, T v,
-                                                  MemoryOrder s,
-                                                  MemoryOrder f) {
+inline bool atomic_compare_exchange_weak_explicit(
+    Atomic<T> volatile *a, T *e, T v, MemoryOrder s, MemoryOrder f
+) {
     return a->compare_exchange_weak(*e, v, s, f);
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_weak_explicit(Atomic<T> *a, T *e,
-                                                  T v,
-                                                  MemoryOrder s,
-                                                  MemoryOrder f) {
+inline bool atomic_compare_exchange_weak_explicit(
+    Atomic<T> *a, T *e, T v, MemoryOrder s, MemoryOrder f
+) {
     return a->compare_exchange_weak(*e, v, s, f);
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_strong_explicit(Atomic<T> volatile *a,
-                                                    T *e, T v,
-                                                    MemoryOrder s,
-                                                    MemoryOrder f) {
+inline bool atomic_compare_exchange_strong_explicit(
+    Atomic<T> volatile *a, T *e, T v, MemoryOrder s, MemoryOrder f
+) {
     return a->compare_exchange_strong(*e, v, s, f);
 }
 
 template <typename T>
-inline bool atomic_compare_exchange_strong_explicit(Atomic<T> *a, T *e,
-                                                    T v,
-                                                    MemoryOrder s,
-                                                    MemoryOrder f) {
+inline bool atomic_compare_exchange_strong_explicit(
+    Atomic<T> *a, T *e, T v, MemoryOrder s, MemoryOrder f
+) {
     return a->compare_exchange_strong(*e, v, s, f);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_add(Atomic<T> volatile *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_add(
+    Atomic<T> volatile *a, T op
+) {
     return a->fetch_add(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_add(Atomic<T> *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_add(
+    Atomic<T> *a, T op
+) {
     return a->fetch_add(op);
 }
 
@@ -669,39 +693,44 @@ inline T *atomic_fetch_add(Atomic<T *> *a, Ptrdiff op) {
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_add_explicit(Atomic<T> volatile *a, T op,
-                          MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_add_explicit(
+    Atomic<T> volatile *a, T op, MemoryOrder ord
+) {
     return a->fetch_add(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_add_explicit(Atomic<T> *a, T op, MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_add_explicit(
+    Atomic<T> *a, T op, MemoryOrder ord
+) {
     return a->fetch_add(op, ord);
 }
 
 template <typename T>
-inline T *atomic_fetch_add_explicit(Atomic<T *> volatile *a,
-                                    Ptrdiff op, MemoryOrder ord) {
+inline T *atomic_fetch_add_explicit(
+    Atomic<T *> volatile *a, Ptrdiff op, MemoryOrder ord
+) {
     return a->fetch_add(op, ord);
 }
 
 template <typename T>
-inline T *atomic_fetch_add_explicit(Atomic<T *> *a, Ptrdiff op,
-                                    MemoryOrder ord) {
+inline T *atomic_fetch_add_explicit(
+    Atomic<T *> *a, Ptrdiff op, MemoryOrder ord
+) {
     return a->fetch_add(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_sub(Atomic<T> volatile *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_sub(
+    Atomic<T> volatile *a, T op
+) {
     return a->fetch_sub(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_sub(Atomic<T> *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_sub(
+    Atomic<T> *a, T op
+) {
     return a->fetch_sub(op);
 }
 
@@ -716,102 +745,114 @@ inline T *atomic_fetch_sub(Atomic<T *> *a, Ptrdiff op) {
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_sub_explicit(Atomic<T> volatile *a, T op,
-                          MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_sub_explicit(
+    Atomic<T> volatile *a, T op, MemoryOrder ord
+) {
     return a->fetch_sub(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_sub_explicit(Atomic<T> *a, T op, MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_sub_explicit(
+    Atomic<T> *a, T op, MemoryOrder ord
+) {
     return a->fetch_sub(op, ord);
 }
 
 template <typename T>
-inline T *atomic_fetch_sub_explicit(Atomic<T *> volatile *a,
-                                    Ptrdiff op, MemoryOrder ord) {
+inline T *atomic_fetch_sub_explicit(
+    Atomic<T *> volatile *a, Ptrdiff op, MemoryOrder ord
+) {
     return a->fetch_sub(op, ord);
 }
 
 template <typename T>
-inline T *atomic_fetch_sub_explicit(Atomic<T *> *a, Ptrdiff op,
-                                    MemoryOrder ord) {
+inline T *atomic_fetch_sub_explicit(
+    Atomic<T *> *a, Ptrdiff op, MemoryOrder ord
+) {
     return a->fetch_sub(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_and(Atomic<T> volatile *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_and(
+    Atomic<T> volatile *a, T op
+) {
     return a->fetch_and(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_and(Atomic<T> *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_and(
+    Atomic<T> *a, T op
+) {
     return a->fetch_and(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_and_explicit(Atomic<T> volatile *a, T op,
-                          MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_and_explicit(
+    Atomic<T> volatile *a, T op, MemoryOrder ord
+) {
     return a->fetch_and(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_and_explicit(Atomic<T> *a, T op, MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_and_explicit(
+    Atomic<T> *a, T op, MemoryOrder ord
+) {
     return a->fetch_and(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_or(Atomic<T> volatile *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_or(
+    Atomic<T> volatile *a, T op
+) {
     return a->fetch_or(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_or(Atomic<T> *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_or(
+    Atomic<T> *a, T op
+) {
     return a->fetch_or(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_or_explicit(Atomic<T> volatile *a, T op,
-                         MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_or_explicit(
+    Atomic<T> volatile *a, T op, MemoryOrder ord
+) {
     return a->fetch_or(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_or_explicit(Atomic<T> *a, T op, MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_or_explicit(
+    Atomic<T> *a, T op, MemoryOrder ord
+) {
     return a->fetch_or(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_xor(Atomic<T> volatile *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_xor(
+    Atomic<T> volatile *a, T op
+) {
     return a->fetch_xor(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_xor(Atomic<T> *a, T op) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_xor(
+    Atomic<T> *a, T op
+) {
     return a->fetch_xor(op);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_xor_explicit(Atomic<T> volatile *a, T op,
-                          MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_xor_explicit(
+    Atomic<T> volatile *a, T op, MemoryOrder ord
+) {
     return a->fetch_xor(op, ord);
 }
 
 template <typename T>
-inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T>
-atomic_fetch_xor_explicit(Atomic<T> *a, T op, MemoryOrder ord) {
+inline EnableIf<IsIntegral<T> && !IsSame<T, bool>, T> atomic_fetch_xor_explicit(
+    Atomic<T> *a, T op, MemoryOrder ord
+) {
     return a->fetch_xor(op, ord);
 }
 
@@ -852,13 +893,13 @@ inline bool atomic_flag_test_and_set(AtomicFlag *a) {
     return a->test_and_set();
 }
 
-inline bool atomic_flag_test_and_set_explicit(AtomicFlag volatile *a,
-                                              MemoryOrder ord) {
+inline bool atomic_flag_test_and_set_explicit(
+    AtomicFlag volatile *a, MemoryOrder ord
+) {
     return a->test_and_set(ord);
 }
 
-inline bool atomic_flag_test_and_set_explicit(AtomicFlag *a,
-                                              MemoryOrder ord) {
+inline bool atomic_flag_test_and_set_explicit(AtomicFlag *a, MemoryOrder ord) {
     return a->test_and_set(ord);
 }
 
@@ -870,8 +911,7 @@ inline void atomic_flag_clear(AtomicFlag *a) {
     a->clear();
 }
 
-inline void atomic_flag_clear_explicit(AtomicFlag volatile *a,
-                                       MemoryOrder ord) {
+inline void atomic_flag_clear_explicit(AtomicFlag volatile *a, MemoryOrder ord) {
     a->clear(ord);
 }
 
diff --git a/ostd/environ.hh b/ostd/environ.hh
index 20749f6..d3e5bdc 100644
--- a/ostd/environ.hh
+++ b/ostd/environ.hh
@@ -24,14 +24,19 @@ inline Maybe<String> env_get(ConstCharRange name) {
     auto tbuf = to_temp_cstr(name, buf, sizeof(buf));
 #ifndef OSTD_PLATFORM_WIN32
     char const *ret = getenv(tbuf.get());
-    if (!ret) return ostd::nothing;
+    if (!ret) {
+        return ostd::nothing;
+    }
     return ostd::move(String(ret));
 #else
     String rbuf;
     for (;;) {
-        auto ret = GetEnvironmentVariable(tbuf.get(), rbuf.data(),
-                                          rbuf.capacity() + 1);
-        if (!ret) return ostd::nothing;
+        auto ret = GetEnvironmentVariable(
+            tbuf.get(), rbuf.data(), rbuf.capacity() + 1
+        );
+        if (!ret) {
+            return ostd::nothing;
+        }
         if (ret <= rbuf.capacity()) {
             rbuf.advance(ret);
             break;
@@ -42,13 +47,15 @@ inline Maybe<String> env_get(ConstCharRange name) {
 #endif
 }
 
-inline bool env_set(ConstCharRange name, ConstCharRange value,
-                    bool update = true) {
+inline bool env_set(
+    ConstCharRange name, ConstCharRange value, bool update = true
+) {
     char sbuf[2048];
     char *buf = sbuf;
     bool alloc = (name.size() + value.size() + 2) > sizeof(sbuf);
-    if (alloc)
+    if (alloc) {
         buf = new char[name.size() + value.size() + 2];
+    }
     memcpy(buf, name.data(), name.size());
     buf[name.size()] = '\0';
     memcpy(&buf[name.size() + 1], value.data(), value.size());
@@ -56,12 +63,14 @@ inline bool env_set(ConstCharRange name, ConstCharRange value,
 #ifndef OSTD_PLATFORM_WIN32
     bool ret = !setenv(buf, &buf[name.size() + 1], update);
 #else
-    if (!update && GetEnvironmentVariable(buf, nullptr, 0))
+    if (!update && GetEnvironmentVariable(buf, nullptr, 0)) {
         return true;
+    }
     bool ret = !!SetEnvironmentVariable(buf, &buf[name.size() + 1]);
 #endif
-    if (alloc)
+    if (alloc) {
         delete[] buf;
+    }
     return ret;
 }
 
@@ -79,7 +88,7 @@ inline bool env_unset(ConstCharRange name) {
 #ifndef OSTD_PLATFORM_WIN32
     return !unsetenv(String(name).data());
 #else
-        return !!SetEnvironmentVariable(String(name).data(), nullptr);
+    return !!SetEnvironmentVariable(String(name).data(), nullptr);
 #endif
 }
 
diff --git a/ostd/event.hh b/ostd/event.hh
index 7088888..4a60e6a 100644
--- a/ostd/event.hh
+++ b/ostd/event.hh
@@ -16,8 +16,9 @@ namespace detail {
     struct SignalBase {
         SignalBase(C *cl): p_class(cl), p_funcs(nullptr), p_nfuncs(0) {}
 
-        SignalBase(SignalBase const &ev): p_class(ev.p_class),
-                                          p_nfuncs(ev.p_nfuncs) {
+        SignalBase(SignalBase const &ev):
+            p_class(ev.p_class), p_nfuncs(ev.p_nfuncs)
+        {
             using Func = Function<void(C &, A...)>;
             byte *bufp = new byte[sizeof(Func) * p_nfuncs];
             Func *nbuf = reinterpret_cast<Func *>(bufp);
@@ -26,8 +27,9 @@ namespace detail {
             p_funcs = nbuf;
         }
 
-        SignalBase(SignalBase &&ev): p_class(nullptr), p_funcs(nullptr),
-                                   p_nfuncs(0) {
+        SignalBase(SignalBase &&ev):
+            p_class(nullptr), p_funcs(nullptr), p_nfuncs(0)
+        {
             swap(ev);
         }
 
@@ -37,8 +39,9 @@ namespace detail {
             p_nfuncs = ev.p_nfuncs;
             byte *bufp = new byte[sizeof(Func) * p_nfuncs];
             Func *nbuf = reinterpret_cast<Func *>(bufp);
-            for (Size i = 0; i < p_nfuncs; ++i)
+            for (Size i = 0; i < p_nfuncs; ++i) {
                 new (&nbuf[i]) Func(ev.p_funcs[i]);
+            }
             p_funcs = nbuf;
             return *this;
         }
@@ -51,8 +54,9 @@ namespace detail {
         ~SignalBase() { clear(); }
 
         void clear() {
-            for (Size i = 0; i < p_nfuncs; ++i)
+            for (Size i = 0; i < p_nfuncs; ++i) {
                 p_funcs[i].~Function<void(C &, A...)>();
+            }
             delete[] reinterpret_cast<byte *>(p_funcs);
             p_funcs = nullptr;
             p_nfuncs = 0;
@@ -80,16 +84,23 @@ namespace detail {
         }
 
         bool disconnect(Size idx) {
-            if ((idx >= p_nfuncs) || !p_funcs[idx]) return false;
+            if ((idx >= p_nfuncs) || !p_funcs[idx]) {
+                return false;
+            }
             p_funcs[idx] = nullptr;
             return true;
         }
 
         template<typename ...Args>
         void emit(Args &&...args) const {
-            if (!p_class) return;
-            for (Size i = 0; i < p_nfuncs; ++i)
-                if (p_funcs[i]) p_funcs[i](*p_class, args...);
+            if (!p_class) {
+                return;
+            }
+            for (Size i = 0; i < p_nfuncs; ++i) {
+                if (p_funcs[i]) {
+                    p_funcs[i](*p_class, args...);
+                }
+            }
         }
 
         C *get_class() const {
diff --git a/ostd/ext/sdl_rwops.hh b/ostd/ext/sdl_rwops.hh
index 6119488..c0985a6 100644
--- a/ostd/ext/sdl_rwops.hh
+++ b/ostd/ext/sdl_rwops.hh
@@ -29,28 +29,41 @@ inline SDL_RWops *stream_to_rwops(Stream &s) {
     if (!rwr) {
         return nullptr;
     }
+
     rwr->hidden.unknown.data1 = &s;
+
     rwr->size = [](SDL_RWops *rw) -> SDLRWopsOffset {
         Stream *is = static_cast<Stream *>(rw->hidden.unknown.data1);
         return static_cast<SDLRWopsOffset>(is->size());
     };
-    rwr->seek = [](SDL_RWops *rw, SDLRWopsOffset pos, int whence) -> SDLRWopsOffset {
+
+    rwr->seek = [](SDL_RWops *rw, SDLRWopsOffset pos, int whence) ->
+        SDLRWopsOffset
+    {
         Stream *is = static_cast<Stream *>(rw->hidden.unknown.data1);
-        if (!pos && whence == SEEK_CUR)
+        if (!pos && whence == SEEK_CUR) {
             return static_cast<SDLRWopsOffset>(is->tell());
-        if (is->seek(((StreamOffset)pos, (StreamSeek)whence))
+        }
+        if (is->seek(((StreamOffset)pos, (StreamSeek)whence)) {
             return static_cast<SDLRWopsOffset>(is->tell());
+        }
         return -1;
     };
+
     rwr->read = [](SDL_RWops *rw, void *buf, Size size, Size nb) -> Size {
         Stream *is = static_cast<Stream *>(rw->hidden.unknown.data1);
         return is->read_bytes(buf, size * nb) / size;
     };
+
     rwr->write = [](SDL_RWops *rw, const void *buf, Size size, Size nb) -> Size {
         Stream *is = static_cast<Stream *>(rw->hidden.unknown.data1);
         return is->write_bytes(buf, size * nb) / size;
     };
-    rwr->close = [](SDL_RWops *) -> int { return 0; };
+
+    rwr->close = [](SDL_RWops *) -> int {
+        return 0;
+    };
+
     return rwr;
 }
 
diff --git a/ostd/filesystem.hh b/ostd/filesystem.hh
index a2f0c48..683904a 100644
--- a/ostd/filesystem.hh
+++ b/ostd/filesystem.hh
@@ -59,12 +59,14 @@ struct FileInfo {
     FileInfo(FileInfo const &i):
         p_slash(i.p_slash), p_dot(i.p_dot), p_type(i.p_type),
         p_path(i.p_path), p_atime(i.p_atime), p_mtime(i.p_mtime),
-        p_ctime(i.p_ctime) {}
+        p_ctime(i.p_ctime)
+    {}
 
     FileInfo(FileInfo &&i):
         p_slash(i.p_slash), p_dot(i.p_dot), p_type(i.p_type),
         p_path(move(i.p_path)), p_atime(i.p_atime), p_mtime(i.p_mtime),
-        p_ctime(i.p_ctime) {
+        p_ctime(i.p_ctime)
+    {
         i.p_slash = i.p_dot = npos;
         i.p_type = FileType::unknown;
         i.p_atime = i.p_ctime = i.p_mtime = 0;
@@ -93,18 +95,22 @@ struct FileInfo {
     ConstCharRange path() const { return p_path.iter(); }
 
     ConstCharRange filename() const {
-        return path().slice((p_slash == npos) ? 0 : (p_slash + 1),
-                            p_path.size());
+        return path().slice(
+            (p_slash == npos) ? 0 : (p_slash + 1), p_path.size()
+        );
     }
 
     ConstCharRange stem() const {
-        return path().slice((p_slash == npos) ? 0 : (p_slash + 1),
-                            (p_dot == npos) ? p_path.size() : p_dot);
+        return path().slice(
+            (p_slash == npos) ? 0 : (p_slash + 1),
+            (p_dot == npos) ? p_path.size() : p_dot
+        );
     }
 
     ConstCharRange extension() const {
-        return (p_dot == npos) ? ConstCharRange()
-                               : path().slice(p_dot, p_path.size());
+        return (p_dot == npos)
+            ? ConstCharRange()
+            : path().slice(p_dot, p_path.size());
     }
 
     FileType type() const { return p_type; }
@@ -150,53 +156,55 @@ private:
         ConstCharRange r = p_path.iter();
 
         ConstCharRange found = find_last(r, PathSeparator);
-        if (found.empty())
+        if (found.empty()) {
             p_slash = npos;
-        else
+        } else {
             p_slash = r.distance_front(found);
+        }
 
         found = find(filename(), '.');
-        if (found.empty())
+        if (found.empty()) {
             p_dot = npos;
-        else
+        } else {
             p_dot = r.distance_front(found);
+        }
 
 #ifdef OSTD_PLATFORM_WIN32
-        if (attr.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        if (attr.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
             p_type = FileType::directory;
-        else if (attr.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT)
+        } else if (attr.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
             p_type = FileType::symlink;
-        else if (attr.dwFileAttributes & (FILE_ATTRIBUTE_ARCHIVE |
-                                          FILE_ATTRIBUTE_COMPRESSED |
-                                          FILE_ATTRIBUTE_COMPRESSED |
-                                          FILE_ATTRIBUTE_HIDDEN |
-                                          FILE_ATTRIBUTE_NORMAL |
-                                          FILE_ATTRIBUTE_SPARSE_FILE |
-                                          FILE_ATTRIBUTE_TEMPORARY))
+        } else if (attr.dwFileAttributes & (
+            FILE_ATTRIBUTE_ARCHIVE     | FILE_ATTRIBUTE_COMPRESSED |
+            FILE_ATTRIBUTE_HIDDEN      | FILE_ATTRIBUTE_NORMAL     |
+            FILE_ATTRIBUTE_SPARSE_FILE | FILE_ATTRIBUTE_TEMPORARY
+        )) {
             p_type = FileType::regular;
-        else
+        } else {
             p_type = FileType::unknown;
+        }
 
         p_atime = detail::filetime_to_time_t(attr.ftLastAccessTime);
         p_mtime = detail::filetime_to_time_t(attr.ftLastWriteTime);
         p_ctime = detail::filetime_to_time_t(attr.ftCreationTime);
 #else
-        if (S_ISREG(st.st_mode))
+        if (S_ISREG(st.st_mode)) {
             p_type = FileType::regular;
-        else if (S_ISDIR(st.st_mode))
+        } else if (S_ISDIR(st.st_mode)) {
             p_type = FileType::directory;
-        else if (S_ISCHR(st.st_mode))
+        } else if (S_ISCHR(st.st_mode)) {
             p_type = FileType::character;
-        else if (S_ISBLK(st.st_mode))
+        } else if (S_ISBLK(st.st_mode)) {
             p_type = FileType::block;
-        else if (S_ISFIFO(st.st_mode))
+        } else if (S_ISFIFO(st.st_mode)) {
             p_type = FileType::fifo;
-        else if (S_ISLNK(st.st_mode))
+        } else if (S_ISLNK(st.st_mode)) {
             p_type = FileType::symlink;
-        else if (S_ISSOCK(st.st_mode))
+        } else if (S_ISSOCK(st.st_mode)) {
             p_type = FileType::socket;
-        else
+        } else {
             p_type = FileType::unknown;
+        }
 
         p_atime = st.st_atime;
         p_mtime = st.st_mtime;
@@ -219,9 +227,9 @@ struct DirectoryStream {
 
     DirectoryStream(): p_d(), p_de(), p_dev(), p_path() {}
     DirectoryStream(DirectoryStream const &) = delete;
-    DirectoryStream(DirectoryStream &&s): p_d(s.p_d), p_de(s.p_de),
-                                          p_dev(s.p_dev),
-                                          p_path(move(s.p_path)) {
+    DirectoryStream(DirectoryStream &&s):
+        p_d(s.p_d), p_de(s.p_de), p_dev(s.p_dev), p_path(move(s.p_path))
+    {
         s.p_d = nullptr;
         s.p_de = nullptr;
         memset(&s.p_dev, 0, sizeof(s.p_dev));
@@ -241,7 +249,9 @@ struct DirectoryStream {
     }
 
     bool open(ConstCharRange path) {
-        if (p_d || (path.size() > FILENAME_MAX)) return false;
+        if (p_d || (path.size() > FILENAME_MAX)) {
+            return false;
+        }
         char buf[FILENAME_MAX + 1];
         memcpy(buf, &path[0], path.size());
         buf[path.size()] = '\0';
@@ -263,20 +273,27 @@ struct DirectoryStream {
     }
 
     long size() const {
-        if (!p_d) return -1;
+        if (!p_d) {
+            return -1;
+        }
         DIR *td = opendir(p_path.data());
-        if (!td) return -1;
+        if (!td) {
+            return -1;
+        }
         long ret = 0;
         struct dirent rdv;
         struct dirent *rd;
-        while (pop_front(td, &rdv, &rd))
+        while (pop_front(td, &rdv, &rd)) {
             ret += strcmp(rd->d_name, ".") && strcmp(rd->d_name, "..");
+        }
         closedir(td);
         return ret;
     }
 
     bool rewind() {
-        if (!p_d) return false;
+        if (!p_d) {
+            return false;
+        }
         rewinddir(p_d);
         if (!pop_front()) {
             close();
@@ -290,8 +307,9 @@ struct DirectoryStream {
     }
 
     FileInfo read() {
-        if (!pop_front())
+        if (!pop_front()) {
             return FileInfo();
+        }
         return front();
     }
 
@@ -311,10 +329,12 @@ private:
         /* order of . and .. in the stream is not guaranteed, apparently...
          * gotta check every time because of that
          */
-        while (*de && (!strcmp((*de)->d_name, ".") ||
-                       !strcmp((*de)->d_name, ".."))) {
-            if (readdir_r(d, dev, de))
+        while (*de && (
+            !strcmp((*de)->d_name, ".") || !strcmp((*de)->d_name, "..")
+        )) {
+            if (readdir_r(d, dev, de)) {
                 return false;
+            }
         }
         return !!*de;
     }
@@ -324,8 +344,9 @@ private:
     }
 
     FileInfo front() const {
-        if (!p_de)
+        if (!p_de) {
             return FileInfo();
+        }
         String ap = p_path;
         ap += PathSeparator;
         ap += static_cast<char const *>(p_de->d_name);
@@ -345,9 +366,9 @@ struct DirectoryStream {
 
     DirectoryStream(): p_handle(INVALID_HANDLE_VALUE), p_data(), p_path() {}
     DirectoryStream(DirectoryStream const &) = delete;
-    DirectoryStream(DirectoryStream &&s): p_handle(s.p_handle),
-                                          p_data(s.p_data),
-                                          p_path(move(s.p_path)) {
+    DirectoryStream(DirectoryStream &&s):
+        p_handle(s.p_handle), p_data(s.p_data), p_path(move(s.p_path))
+    {
         s.p_handle = INVALID_HANDLE_VALUE;
         memset(&s.p_data, 0, sizeof(s.p_data));
     }
@@ -366,10 +387,12 @@ struct DirectoryStream {
     }
 
     bool open(ConstCharRange path) {
-        if (p_handle != INVALID_HANDLE_VALUE)
+        if (p_handle != INVALID_HANDLE_VALUE) {
             return false;
-        if ((path.size() >= 1024) || !path.size())
+        }
+        if ((path.size() >= 1024) || !path.size()) {
             return false;
+        }
         char buf[1026];
         memcpy(buf, &path[0], path.size());
         char *bptr = &buf[path.size()];
@@ -378,10 +401,12 @@ struct DirectoryStream {
         /* include trailing zero */
         memcpy(bptr, "\\*", 3);
         p_handle = FindFirstFile(buf, &p_data);
-        if (p_handle == INVALID_HANDLE_VALUE)
+        if (p_handle == INVALID_HANDLE_VALUE) {
             return false;
-        while (!strcmp(p_data.cFileName, ".") ||
-               !strcmp(p_data.cFileName, "..")) {
+        }
+        while (
+            !strcmp(p_data.cFileName, ".") || !strcmp(p_data.cFileName, "..")
+        ) {
             if (!FindNextFile(p_handle, &p_data)) {
                 FindClose(p_handle);
                 p_handle = INVALID_HANDLE_VALUE;
@@ -396,47 +421,55 @@ struct DirectoryStream {
     bool is_open() const { return p_handle != INVALID_HANDLE_VALUE; }
 
     void close() {
-        if (p_handle != INVALID_HANDLE_VALUE)
+        if (p_handle != INVALID_HANDLE_VALUE) {
             FindClose(p_handle);
+        }
         p_handle = INVALID_HANDLE_VALUE;
         p_data.cFileName[0] = '\0';
     }
 
     long size() const {
-        if (p_handle == INVALID_HANDLE_VALUE)
+        if (p_handle == INVALID_HANDLE_VALUE) {
             return -1;
+        }
         WIN32_FIND_DATA wfd;
         HANDLE td = FindFirstFile(p_path.data(), &wfd);
-        if (td == INVALID_HANDLE_VALUE)
+        if (td == INVALID_HANDLE_VALUE) {
             return -1;
-        while (!strcmp(wfd.cFileName, ".") && !strcmp(wfd.cFileName, ".."))
+        }
+        while (!strcmp(wfd.cFileName, ".") && !strcmp(wfd.cFileName, "..")) {
             if (!FindNextFile(td, &wfd)) {
                 FindClose(td);
                 return 0;
             }
+        }
         long ret = 1;
-        while (FindNextFile(td, &wfd))
+        while (FindNextFile(td, &wfd)) {
             ++ret;
+        }
         FindClose(td);
         return ret;
     }
 
     bool rewind() {
-        if (p_handle != INVALID_HANDLE_VALUE)
+        if (p_handle != INVALID_HANDLE_VALUE) {
             FindClose(p_handle);
+        }
         p_handle = FindFirstFile(p_path.data(), &p_data);
         if (p_handle == INVALID_HANDLE_VALUE) {
             p_data.cFileName[0] = '\0';
             return false;
         }
-        while (!strcmp(p_data.cFileName, ".") ||
-               !strcmp(p_data.cFileName, ".."))
+        while (
+            !strcmp(p_data.cFileName, ".") || !strcmp(p_data.cFileName, "..")
+        ) {
             if (!FindNextFile(p_handle, &p_data)) {
                 FindClose(p_handle);
                 p_handle = INVALID_HANDLE_VALUE;
                 p_data.cFileName[0] = '\0';
                 return false;
             }
+        }
         return true;
     }
 
@@ -445,8 +478,9 @@ struct DirectoryStream {
     }
 
     FileInfo read() {
-        if (!pop_front())
+        if (!pop_front()) {
             return FileInfo();
+        }
         return front();
     }
 
@@ -460,8 +494,9 @@ struct DirectoryStream {
 
 private:
     bool pop_front() {
-        if (!is_open())
+        if (!is_open()) {
             return false;
+        }
         if (!FindNextFile(p_handle, &p_data)) {
             p_data.cFileName[0] = '\0';
             return false;
@@ -470,8 +505,9 @@ private:
     }
 
     FileInfo front() const {
-        if (empty())
+        if (empty()) {
             return FileInfo();
+        }
         String ap = p_path;
         ap += PathSeparator;
         ap += static_cast<char const *>(p_data.cFileName);
@@ -521,7 +557,8 @@ inline DirectoryRange DirectoryStream::iter() {
 }
 
 namespace detail {
-    template<Size I> struct PathJoin {
+    template<Size I>
+    struct PathJoin {
         template<typename T, typename ...A>
         static void join(String &s, T const &a, A const &...b) {
             s += a;
@@ -530,7 +567,8 @@ namespace detail {
         }
     };
 
-    template<> struct PathJoin<1> {
+    template<>
+    struct PathJoin<1> {
         template<typename T>
         static void join(String &s, T const &a) {
             s += a;
@@ -548,8 +586,9 @@ inline FileInfo path_join(A const &...args) {
 
 inline bool directory_change(ConstCharRange path) {
     char buf[1024];
-    if (path.size() >= 1024)
+    if (path.size() >= 1024) {
         return false;
+    }
     memcpy(buf, path.data(), path.size());
     buf[path.size()] = '\0';
 #ifndef OSTD_PLATFORM_WIN32
diff --git a/ostd/format.hh b/ostd/format.hh
index d86ceee..87076a2 100644
--- a/ostd/format.hh
+++ b/ostd/format.hh
@@ -110,17 +110,17 @@ namespace detail {
 
     /* retrieve width/precision */
     template<typename T>
-    bool convert_arg_param(T const &val, int &param, EnableIf<
-        IsIntegral<T>, bool
-    > = true) {
+    bool convert_arg_param(
+        T const &val, int &param, EnableIf<IsIntegral<T>, bool> = true
+    ) {
         param = int(val);
         return true;
     }
 
     template<typename T>
-    bool convert_arg_param(T const &, int &, EnableIf<
-        !IsIntegral<T>, bool
-    > = true) {
+    bool convert_arg_param(
+        T const &, int &, EnableIf<!IsIntegral<T>, bool> = true
+    ) {
         assert(false && "invalid argument for width/precision");
         return false;
     }
@@ -135,7 +135,9 @@ namespace detail {
     }
     template<typename T, typename ...A>
     bool get_arg_param(Size idx, int &param, T const &val, A const &...args) {
-        if (idx) return get_arg_param(idx - 1, param, args...);
+        if (idx) {
+            return get_arg_param(idx - 1, param, args...);
+        }
         return convert_arg_param(val, param);
     }
 }
@@ -143,19 +145,28 @@ namespace detail {
 struct FormatSpec {
     FormatSpec(): p_nested_escape(false), p_fmt() {}
     FormatSpec(ConstCharRange fmt, bool escape = false):
-        p_nested_escape(escape), p_fmt(fmt) {}
+        p_nested_escape(escape), p_fmt(fmt)
+    {}
 
     template<typename R>
     bool read_until_spec(R &writer, Size *wret) {
         Size written = 0;
-        if (wret) *wret = 0;
-        if (p_fmt.empty()) return false;
+        if (wret) {
+            *wret = 0;
+        }
+        if (p_fmt.empty()) {
+            return false;
+        }
         while (!p_fmt.empty()) {
             if (p_fmt.front() == '%') {
                 p_fmt.pop_front();
-                if (p_fmt.front() == '%') goto plain;
+                if (p_fmt.front() == '%') {
+                    goto plain;
+                }
                 bool r = read_spec();
-                if (wret) *wret = written;
+                if (wret) {
+                    *wret = written;
+                }
                 return r;
             }
         plain:
@@ -163,16 +174,22 @@ struct FormatSpec {
             writer.put(p_fmt.front());
             p_fmt.pop_front();
         }
-        if (wret) *wret = written;
+        if (wret) {
+            *wret = written;
+        }
         return false;
     }
 
     template<typename R>
     Size write_spaces(R &writer, Size n, bool left, char c = ' ') const {
-        if (left == bool(p_flags & FMT_FLAG_DASH)) return 0;
+        if (left == bool(p_flags & FMT_FLAG_DASH)) {
+            return 0;
+        }
         int r = p_width - int(n);
         for (int w = p_width - int(n); --w >= 0; writer.put(c));
-        if (r < 0) return 0;
+        if (r < 0) {
+            return 0;
+        }
         return r;
     }
 
@@ -183,11 +200,21 @@ struct FormatSpec {
     template<typename R>
     Size build_spec(R &&out, ConstCharRange spec) {
         Size ret = out.put('%');
-        if (p_flags & FMT_FLAG_DASH ) ret += out.put('-');
-        if (p_flags & FMT_FLAG_ZERO ) ret += out.put('0');
-        if (p_flags & FMT_FLAG_SPACE) ret += out.put(' ');
-        if (p_flags & FMT_FLAG_PLUS ) ret += out.put('+');
-        if (p_flags & FMT_FLAG_HASH ) ret += out.put('#');
+        if (p_flags & FMT_FLAG_DASH ) {
+            ret += out.put('-');
+        }
+        if (p_flags & FMT_FLAG_ZERO ) {
+            ret += out.put('0');
+        }
+        if (p_flags & FMT_FLAG_SPACE) {
+            ret += out.put(' ');
+        }
+        if (p_flags & FMT_FLAG_PLUS ) {
+            ret += out.put('+');
+        }
+        if (p_flags & FMT_FLAG_HASH ) {
+            ret += out.put('#');
+        }
         ret += out.put_n("*.*", 3);
         ret += out.put_n(&spec[0], spec.size());
         return ret;
@@ -250,7 +277,9 @@ protected:
         while (!p_fmt.empty()) {
             if (p_fmt.front() == '%') {
                 p_fmt.pop_front();
-                if (p_fmt.front() == '%') goto plain;
+                if (p_fmt.front() == '%') {
+                    goto plain;
+                }
                 return read_spec();
             }
         plain:
@@ -339,12 +368,17 @@ protected:
             p_flags = detail::parse_fmt_flags(p_fmt, 0);
         } else {
             for (Size i = 0; i < ndig; ++i) {
-                if (p_buf[i] != '0') break;
+                if (p_buf[i] != '0') {
+                    break;
+                }
                 ++skipd;
             }
-            if (skipd) p_flags = FMT_FLAG_ZERO;
-            if (skipd == ndig)
+            if (skipd) {
+                p_flags = FMT_FLAG_ZERO;
+            }
+            if (skipd == ndig) {
                 p_flags = detail::parse_fmt_flags(p_fmt, p_flags);
+            }
         }
 
         /* range/array formatting */
@@ -371,7 +405,9 @@ protected:
         p_precision = 0;
         p_has_precision = false;
         p_arg_precision = false;
-        if (p_fmt.front() != '.') goto fmtchar;
+        if (p_fmt.front() != '.') {
+            goto fmtchar;
+        }
         p_fmt.pop_front();
 
         if (detail::read_digits(p_fmt, p_buf)) {
@@ -380,7 +416,9 @@ protected:
         } else if (p_fmt.front() == '*') {
             p_arg_precision = p_has_precision = true;
             p_fmt.pop_front();
-        } else return false;
+        } else {
+            return false;
+        }
 
     fmtchar:
         p_spec = p_fmt.front();
@@ -397,11 +435,14 @@ protected:
 
 /* for custom container formatting */
 
-template<typename T, typename R, typename = EnableIf<
-    IsSame<decltype(declval<T const &>()
-        .to_format(declval<R &>(), declval<FormatSpec const &>())), bool
+template<
+    typename T, typename R, typename = EnableIf<
+        IsSame<decltype(declval<T const &>()
+            .to_format(declval<R &>(), declval<FormatSpec const &>())), bool
+        >
     >
->> inline bool to_format(T const &v, R &writer, FormatSpec const &fs) {
+>
+inline bool to_format(T const &v, R &writer, FormatSpec const &fs) {
     return v.to_format(writer, fs);
 }
 
@@ -421,9 +462,12 @@ namespace detail {
         }
 
         int base = detail::fmt_bases[specn];
-        if (!val) buf[n++] = '0';
-        for (; val; val /= base)
+        if (!val) {
+            buf[n++] = '0';
+        }
+        for (; val; val /= base) {
             buf[n++] = detail::fmt_digits[spec >= 'a'][val % base];
+        }
         r = n;
 
         int flags = fl->flags();
@@ -441,12 +485,16 @@ namespace detail {
             r += pfxlen;
         }
 
-        if (!zero)
+        if (!zero) {
             r += fl->write_spaces(writer, n + pfxlen + sign, true, ' ');
-        if (sign) writer.put(neg ? '-' : *((" \0+") + lsgn * 2));
+        }
+        if (sign) {
+            writer.put(neg ? '-' : *((" \0+") + lsgn * 2));
+        }
         writer.put_n(pfx, pfxlen);
-        if (zero)
+        if (zero) {
             r += fl->write_spaces(writer, n + pfxlen + sign, true, '0');
+        }
 
         for (int i = int(n - 1); i >= 0; --i) {
             writer.put(buf[i]);
@@ -456,8 +504,10 @@ namespace detail {
     }
 
     template<typename R, typename ...A>
-    static Ptrdiff format_impl(R &writer, Size &fmtn, bool escape,
-                               ConstCharRange fmt, A const &...args);
+    static Ptrdiff format_impl(
+        R &writer, Size &fmtn, bool escape,
+        ConstCharRange fmt, A const &...args
+    );
 
     template<typename T, typename = RangeOf<T>>
     static True test_fmt_range(int);
@@ -470,88 +520,99 @@ namespace detail {
     template<Size I>
     struct FmtTupleUnpacker {
         template<typename R, typename T, typename ...A>
-        static inline Ptrdiff unpack(R &writer, Size &fmtn, bool esc,
-                                     ConstCharRange fmt, T const &item,
-                                     A const &...args) {
-            return FmtTupleUnpacker<I - 1>::unpack(writer, fmtn, esc, fmt,
-                item, get<I - 1>(item), args...);
+        static inline Ptrdiff unpack(
+            R &writer, Size &fmtn, bool esc, ConstCharRange fmt,
+            T const &item, A const &...args
+        ) {
+            return FmtTupleUnpacker<I - 1>::unpack(
+                writer, fmtn, esc, fmt, item, get<I - 1>(item), args...
+            );
         }
     };
 
     template<>
     struct FmtTupleUnpacker<0> {
         template<typename R, typename T, typename ...A>
-        static inline Ptrdiff unpack(R &writer, Size &fmtn, bool esc,
-                                     ConstCharRange fmt, T const &,
-                                     A const &...args) {
+        static inline Ptrdiff unpack(
+            R &writer, Size &fmtn, bool esc, ConstCharRange fmt,
+            T const &, A const &...args
+        ) {
             return format_impl(writer, fmtn, esc, fmt, args...);
         }
     };
 
     template<typename R, typename T>
-    inline Ptrdiff format_ritem(R &writer, Size &fmtn, bool esc, bool,
-                                ConstCharRange fmt, T const &item,
-                                EnableIf<!IsTupleLike<T>, bool>
-                                    = true) {
+    inline Ptrdiff format_ritem(
+        R &writer, Size &fmtn, bool esc, bool, ConstCharRange fmt,
+        T const &item, EnableIf<!IsTupleLike<T>, bool> = true
+    ) {
         return format_impl(writer, fmtn, esc, fmt, item);
     }
 
     template<typename R, typename T>
-    inline Ptrdiff format_ritem(R &writer, Size &fmtn, bool esc,
-                                bool expandval, ConstCharRange fmt,
-                                T const &item,
-                                EnableIf<IsTupleLike<T>, bool>
-                                    = true) {
+    inline Ptrdiff format_ritem(
+        R &writer, Size &fmtn, bool esc, bool expandval, ConstCharRange fmt,
+        T const &item, EnableIf<IsTupleLike<T>, bool> = true
+    ) {
         if (expandval) {
-            return FmtTupleUnpacker<TupleSize<T>>::unpack(writer,
-                fmtn, esc, fmt, item);
+            return FmtTupleUnpacker<TupleSize<T>>::unpack(
+                writer, fmtn, esc, fmt, item
+            );
         }
         return format_impl(writer, fmtn, esc, fmt, item);
     }
 
     template<typename R, typename T>
-    inline Ptrdiff write_range(R &writer, FormatSpec const *fl,
-                               bool escape, bool expandval,
-                               ConstCharRange sep,
-                               T const &val,
-                               EnableIf<FmtRangeTest<T>, bool>
-                                   = true) {
+    inline Ptrdiff write_range(
+        R &writer, FormatSpec const *fl, bool escape, bool expandval,
+        ConstCharRange sep, T const &val, EnableIf<FmtRangeTest<T>, bool> = true
+    ) {
         auto range = ostd::iter(val);
-        if (range.empty()) return 0;
+        if (range.empty()) {
+            return 0;
+        }
         Ptrdiff ret = 0;
         Size fmtn = 0;
         /* test first item */
-        Ptrdiff fret = format_ritem(writer, fmtn, escape, expandval,
-            fl->rest(), range.front());
-        if (fret < 0) return fret;
+        Ptrdiff fret = format_ritem(
+            writer, fmtn, escape, expandval, fl->rest(), range.front()
+        );
+        if (fret < 0) {
+            return fret;
+        }
         ret += fret;
         range.pop_front();
         /* write the rest (if any) */
         for (; !range.empty(); range.pop_front()) {
             auto v = writer.put_n(&sep[0], sep.size());
-            if (v != sep.size())
+            if (v != sep.size()) {
                 return -1;
+            }
             ret += sep.size();
-            fret = format_ritem(writer, fmtn, escape, expandval,
-                fl->rest(), range.front());
-            if (fret < 0) return fret;
+            fret = format_ritem(
+                writer, fmtn, escape, expandval, fl->rest(), range.front()
+            );
+            if (fret < 0) {
+                return fret;
+            }
             ret += fret;
         }
         return ret;
     }
 
     template<typename R, typename T>
-    inline Ptrdiff write_range(R &, FormatSpec const *, bool, bool,
-                               ConstCharRange, T const &,
-                               EnableIf<!FmtRangeTest<T>, bool>
-                                   = true) {
+    inline Ptrdiff write_range(
+        R &, FormatSpec const *, bool, bool, ConstCharRange,
+        T const &, EnableIf<!FmtRangeTest<T>, bool> = true
+    ) {
         assert(false && "invalid value for ranged format");
         return -1;
     }
 
     template<typename T>
     static True test_fmt_tostr(decltype(ostd::to_string(declval<T>())) *);
-    template<typename> static False test_fmt_tostr(...);
+    template<typename>
+    static False test_fmt_tostr(...);
 
     template<typename T>
     constexpr bool FmtTostrTest = decltype(test_fmt_tostr<T>(0))::value;
@@ -583,10 +644,11 @@ namespace detail {
         ret.push('"');
         while (!val.empty()) {
             char const *esc = escape_fmt_char(val.front(), '"');
-            if (esc)
+            if (esc) {
                 ret.append(esc);
-            else
+            } else {
                 ret.push(val.front());
+            }
             val.pop_front();
         }
         ret.push('"');
@@ -594,9 +656,9 @@ namespace detail {
     }
 
     template<typename T, typename R>
-    static True test_tofmt(decltype(to_format(declval<T const &>(),
-                                              declval<R &>(),
-                                              declval<FormatSpec const &>())) *);
+    static True test_tofmt(decltype(to_format(
+        declval<T const &>(), declval<R &>(), declval<FormatSpec const &>()
+    )) *);
 
     template<typename, typename>
     static False test_tofmt(...);
@@ -615,7 +677,9 @@ namespace detail {
                 return write_str(writer, false, escape_fmt_str(val));
             }
             Size n = val.size();
-            if (this->precision()) n = this->precision();
+            if (this->precision()) {
+                n = this->precision();
+            }
             Ptrdiff r = n;
             r += this->write_spaces(writer, n, true);
             writer.put_n(&val[0], n);
@@ -625,9 +689,11 @@ namespace detail {
 
         /* any string value */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool escape, T const &val, EnableIf<
-            IsConstructible<ConstCharRange, T const &>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool escape, T const &val, EnableIf<
+                IsConstructible<ConstCharRange, T const &>, bool
+            > = true
+        ) {
             if (this->spec() != 's') {
                 assert(false && "cannot print strings with the given spec");
                 return -1;
@@ -661,7 +727,9 @@ namespace detail {
                 writer.put('\'');
                 writer.put(val);
                 writer.put('\'');
-            } else writer.put(val);
+            } else {
+                writer.put(val);
+            }
             r += this->write_spaces(writer, 1 + escape * 2, false);
             return r;
         }
@@ -669,33 +737,41 @@ namespace detail {
         /* bool */
         template<typename R>
         Ptrdiff write(R &writer, bool, bool val) {
-            if (this->spec() == 's')
+            if (this->spec() == 's') {
                 return write(writer, ("false\0true") + (6 * val));
-            else
+            } else {
                 return write(writer, int(val));
+            }
         }
 
         /* signed integers */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool, T val, EnableIf<
-            IsIntegral<T> && IsSigned<T>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool, T val, EnableIf<
+                IsIntegral<T> && IsSigned<T>, bool
+            > = true
+        ) {
             using UT = MakeUnsigned<T>;
-            return detail::write_u(writer, this, val < 0,
-                (val < 0) ? static_cast<UT>(-val) : static_cast<UT>(val));
+            return detail::write_u(
+                writer, this, val < 0,
+                (val < 0) ? static_cast<UT>(-val) : static_cast<UT>(val)
+            );
         }
 
         /* unsigned integers */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool, T val, EnableIf<
-            IsIntegral<T> && IsUnsigned<T>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool, T val, EnableIf<
+                IsIntegral<T> && IsUnsigned<T>, bool
+            > = true
+        ) {
             return detail::write_u(writer, this, false, val);
         }
 
         template<typename R, typename T, bool Long = IsSame<T, ldouble>>
-        Ptrdiff write(R &writer, bool, T val, EnableIf<IsFloatingPoint<T>, bool>
-                      = true) {
+        Ptrdiff write(
+            R &writer, bool, T val, EnableIf<IsFloatingPoint<T>, bool> = true
+        ) {
             char buf[16], rbuf[128];
             char fmtspec[Long + 1];
 
@@ -705,31 +781,42 @@ namespace detail {
                 assert(false && "cannot format floats with the given spec");
                 return -1;
             }
-            if (specn == 7) fmtspec[Long] = 'g';
-            if (Long) fmtspec[0] = 'L';
+            if (specn == 7) {
+                fmtspec[Long] = 'g';
+            }
+            if (Long) {
+                fmtspec[0] = 'L';
+            }
 
             buf[this->build_spec(iter(buf), fmtspec)] = '\0';
-            Ptrdiff ret = snprintf(rbuf, sizeof(rbuf), buf,
-                this->width(),
-                this->has_precision() ? this->precision() : 6, val);
+            Ptrdiff ret = snprintf(
+                rbuf, sizeof(rbuf), buf, this->width(),
+                this->has_precision() ? this->precision() : 6, val
+            );
 
             char *dbuf = nullptr;
             if (Size(ret) >= sizeof(rbuf)) {
                 /* this should typically never happen */
                 dbuf = new char[ret + 1];
-                ret = snprintf(dbuf, ret + 1, buf, this->width(),
-                    this->has_precision() ? this->precision() : 6, val);
+                ret = snprintf(
+                    dbuf, ret + 1, buf, this->width(),
+                    this->has_precision() ? this->precision() : 6, val
+                );
                 writer.put_n(dbuf, ret);
                 delete[] dbuf;
-            } else writer.put_n(rbuf, ret);
+            } else {
+                writer.put_n(rbuf, ret);
+            }
             return ret;
         }
 
         /* pointer value */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool, T *val, EnableIf<
-            !IsConstructible<ConstCharRange, T *>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool, T *val, EnableIf<
+                !IsConstructible<ConstCharRange, T *>, bool
+            > = true
+        ) {
             if (this->p_spec == 's') {
                 this->p_spec = 'x';
                 this->p_flags |= FMT_FLAG_HASH;
@@ -739,11 +826,13 @@ namespace detail {
 
         /* generic value */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool, T const &val, EnableIf<
-            !IsArithmetic<T> &&
-            !IsConstructible<ConstCharRange, T const &> &&
-            FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool, T const &val, EnableIf<
+                !IsArithmetic<T> &&
+                !IsConstructible<ConstCharRange, T const &> &&
+                FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
+            > = true
+        ) {
             if (this->spec() != 's') {
                 assert(false && "custom objects need '%s' format");
                 return -1;
@@ -753,21 +842,26 @@ namespace detail {
 
         /* custom format case */
         template<typename R, typename T>
-        Ptrdiff write(R &writer, bool, T const &val,
-            EnableIf<FmtTofmtTest<T, TostrRange<R>>, bool
-        > = true) {
+        Ptrdiff write(
+            R &writer, bool, T const &val,
+            EnableIf<FmtTofmtTest<T, TostrRange<R>>, bool> = true
+        ) {
             TostrRange<R> sink(writer);
-            if (!to_format(val, sink, *this)) return -1;
+            if (!to_format(val, sink, *this)) {
+                return -1;
+            }
             return sink.get_written();
         }
 
         /* generic failure case */
         template<typename R, typename T>
-        Ptrdiff write(R &, bool, T const &, EnableIf<
-            !IsArithmetic<T> &&
-            !IsConstructible<ConstCharRange, T const &> &&
-            !FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
-        > = true) {
+        Ptrdiff write(
+            R &, bool, T const &, EnableIf<
+                !IsArithmetic<T> &&
+                !IsConstructible<ConstCharRange, T const &> &&
+                !FmtTostrTest<T> && !FmtTofmtTest<T, TostrRange<R>>, bool
+            > = true
+        ) {
             assert(false && "value cannot be formatted");
             return -1;
         }
@@ -783,39 +877,48 @@ namespace detail {
         }
 
         template<typename R, typename T, typename ...A>
-        Ptrdiff write_arg(R &writer, Size idx, T const &val,
-                          A const &...args) {
-            if (idx) return write_arg(writer, idx - 1, args...);
+        Ptrdiff write_arg(
+            R &writer, Size idx, T const &val, A const &...args
+        ) {
+            if (idx) {
+                return write_arg(writer, idx - 1, args...);
+            }
             return write(writer, this->p_nested_escape, val);
         }
 
         /* range writer */
         template<typename R, typename T>
-        Ptrdiff write_range(R &writer, Size idx, bool expandval,
-                            ConstCharRange sep, T const &val) {
+        Ptrdiff write_range(
+            R &writer, Size idx, bool expandval,
+            ConstCharRange sep, T const &val
+        ) {
             if (idx) {
                 assert(false && "not enough format args");
                 return -1;
             }
-            return detail::write_range(writer, this, this->p_nested_escape,
-                expandval, sep, val);
+            return detail::write_range(
+                writer, this, this->p_nested_escape, expandval, sep, val
+            );
         }
 
         template<typename R, typename T, typename ...A>
-        Ptrdiff write_range(R &writer, Size idx, bool expandval,
-                            ConstCharRange sep, T const &val,
-                            A const &...args) {
+        Ptrdiff write_range(
+            R &writer, Size idx, bool expandval, ConstCharRange sep,
+            T const &val, A const &...args
+        ) {
             if (idx) {
                 return write_range(writer, idx - 1, expandval, sep, args...);
             }
-            return detail::write_range(writer, this,
-                this->p_nested_escape, expandval, sep, val);
+            return detail::write_range(
+                writer, this, this->p_nested_escape, expandval, sep, val
+            );
         }
     };
 
     template<typename R, typename ...A>
-    inline Ptrdiff format_impl(R &writer, Size &fmtn, bool escape,
-                               ConstCharRange fmt, A const &...args) {
+    inline Ptrdiff format_impl(
+        R &writer, Size &fmtn, bool escape, ConstCharRange fmt, A const &...args
+    ) {
         Size argidx = 1, retn = 0, twr = 0;
         Ptrdiff written = 0;
         detail::WriteSpec spec(fmt, escape);
@@ -823,26 +926,33 @@ namespace detail {
             written += twr;
             Size argpos = spec.index();
             if (spec.is_nested()) {
-                if (!argpos) argpos = argidx++;
+                if (!argpos) {
+                    argpos = argidx++;
+                }
                 /* FIXME: figure out a better way */
                 detail::WriteSpec nspec(spec.nested(), spec.nested_escape());
-                Ptrdiff sw = nspec.write_range(writer, argpos - 1,
-                    (spec.flags() & FMT_FLAG_HASH),
-                    spec.nested_sep(), args...);
-                if (sw < 0) return sw;
+                Ptrdiff sw = nspec.write_range(
+                    writer, argpos - 1, (spec.flags() & FMT_FLAG_HASH),
+                    spec.nested_sep(), args...
+                );
+                if (sw < 0) {
+                    return sw;
+                }
                 written += sw;
                 continue;
             }
             if (!argpos) {
                 argpos = argidx++;
                 if (spec.arg_width()) {
-                    if (!spec.set_width(argpos - 1, args...))
+                    if (!spec.set_width(argpos - 1, args...)) {
                         return -1;
+                    }
                     argpos = argidx++;
                 }
                 if (spec.arg_precision()) {
-                    if (!spec.set_precision(argpos - 1, args...))
+                    if (!spec.set_precision(argpos - 1, args...)) {
                         return -1;
+                    }
                     argpos = argidx++;
                 }
             } else {
@@ -852,20 +962,24 @@ namespace detail {
                         assert(false && "argument precision not given");
                         return -1;
                     }
-                    if (!spec.set_precision(argpos - 2, args...))
+                    if (!spec.set_precision(argpos - 2, args...)) {
                         return -1;
+                    }
                 }
                 if (spec.arg_width()) {
                     if (argpos <= (Size(argprec) + 1)) {
                         assert(false && "argument width not given");
                         return -1;
                     }
-                    if (!spec.set_width(argpos - 2 - argprec, args...))
+                    if (!spec.set_width(argpos - 2 - argprec, args...)) {
                         return -1;
+                    }
                 }
             }
             Ptrdiff sw = spec.write_arg(writer, argpos - 1, args...);
-            if (sw < 0) return sw;
+            if (sw < 0) {
+                return sw;
+            }
             written += sw;
         }
         written += twr;
@@ -874,19 +988,23 @@ namespace detail {
     }
 
     template<typename R, typename ...A>
-    inline Ptrdiff format_impl(R &writer, Size &fmtn, bool,
-                               ConstCharRange fmt) {
+    inline Ptrdiff format_impl(
+        R &writer, Size &fmtn, bool, ConstCharRange fmt
+    ) {
         Size written = 0;
         detail::WriteSpec spec(fmt, false);
-        if (spec.read_until_spec(writer, &written)) return -1;
+        if (spec.read_until_spec(writer, &written)) {
+            return -1;
+        }
         fmtn = 0;
         return written;
     }
 } /* namespace detail */
 
 template<typename R, typename ...A>
-inline Ptrdiff format(R &&writer, Size &fmtn, ConstCharRange fmt,
-                      A const &...args) {
+inline Ptrdiff format(
+    R &&writer, Size &fmtn, ConstCharRange fmt, A const &...args
+) {
     return detail::format_impl(writer, fmtn, false, fmt, args...);
 }
 
diff --git a/ostd/functional.hh b/ostd/functional.hh
index 3940fb0..4594267 100644
--- a/ostd/functional.hh
+++ b/ostd/functional.hh
@@ -19,7 +19,8 @@ namespace ostd {
 /* basic function objects */
 
 #define OSTD_DEFINE_BINARY_OP(name, op, RT) \
-template<typename T> struct name { \
+template<typename T> \
+struct name { \
     RT operator()(T const &x, T const &y) const { \
         return x op y; \
     } \
@@ -58,7 +59,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct CharEqual<T, false> {
+    template<typename T>
+    struct CharEqual<T, false> {
         using FirstArgument = T *;
         using SecondArgument = T *;
         using Result = bool;
@@ -68,7 +70,8 @@ namespace detail {
     };
 }
 
-template<typename T> struct EqualWithCstr {
+template<typename T>
+struct EqualWithCstr {
     using FirstArgument = T;
     using SecondArgument = T;
     bool operator()(T const &x, T const &y) const {
@@ -76,36 +79,40 @@ template<typename T> struct EqualWithCstr {
     }
 };
 
-template<typename T> struct EqualWithCstr<T *>: detail::CharEqual<T> {};
+template<typename T>
+struct EqualWithCstr<T *>: detail::CharEqual<T> {};
 
-template<typename T> struct LogicalNot {
+template<typename T>
+struct LogicalNot {
     bool operator()(T const &x) const { return !x; }
     using Argument = T;
     using Result = bool;
 };
 
-template<typename T> struct Negate {
+template<typename T>
+struct Negate {
     bool operator()(T const &x) const { return -x; }
     using Argument = T;
     using Result = T;
 };
 
-template<typename T> struct BinaryNegate {
+template<typename T>
+struct BinaryNegate {
     using FirstArgument = typename T::FirstArgument;
     using SecondArgument = typename T::SecondArgument;
     using Result = bool;
 
     explicit BinaryNegate(T const &f): p_fn(f) {}
 
-    bool operator()(FirstArgument const &x,
-                    SecondArgument const &y) {
+    bool operator()(FirstArgument const &x, SecondArgument const &y) {
         return !p_fn(x, y);
     }
 private:
     T p_fn;
 };
 
-template<typename T> struct UnaryNegate {
+template<typename T>
+struct UnaryNegate {
     using Argument = typename T::Argument;
     using Result = bool;
 
@@ -117,11 +124,13 @@ private:
     T p_fn;
 };
 
-template<typename T> UnaryNegate<T> not1(T const &fn) {
+template<typename T>
+UnaryNegate<T> not1(T const &fn) {
     return UnaryNegate<T>(fn);
 }
 
-template<typename T> BinaryNegate<T> not2(T const &fn) {
+template<typename T>
+BinaryNegate<T> not2(T const &fn) {
     return BinaryNegate<T>(fn);
 }
 
@@ -194,19 +203,26 @@ namespace detail {
 }
 
 #if OSTD_BYTE_ORDER == OSTD_ENDIAN_LIL
-template<typename T> struct FromLilEndian: detail::EndianSame<T> {};
-template<typename T> struct FromBigEndian: EndianSwap<T> {};
+template<typename T>
+struct FromLilEndian: detail::EndianSame<T> {};
+template<typename T>
+struct FromBigEndian: EndianSwap<T> {};
 #else
-template<typename T> struct FromLilEndian: EndianSwap<T> {};
-template<typename T> struct FromBigEndian: detail::EndianSame<T> {};
+template<typename T>
+struct FromLilEndian: EndianSwap<T> {};
+template<typename T>
+struct FromBigEndian: detail::EndianSame<T> {};
 #endif
 
-template<typename T> T from_lil_endian(T x) { return FromLilEndian<T>()(x); }
-template<typename T> T from_big_endian(T x) { return FromBigEndian<T>()(x); }
+template<typename T>
+T from_lil_endian(T x) { return FromLilEndian<T>()(x); }
+template<typename T>
+T from_big_endian(T x) { return FromBigEndian<T>()(x); }
 
 /* hash */
 
-template<typename T> struct ToHash {
+template<typename T>
+struct ToHash {
     using Argument = T;
     using Result = Size;
 
@@ -216,7 +232,8 @@ template<typename T> struct ToHash {
 };
 
 namespace detail {
-    template<typename T> struct ToHashBase {
+    template<typename T>
+    struct ToHashBase {
         using Argument = T;
         using Result = Size;
 
@@ -226,7 +243,9 @@ namespace detail {
     };
 }
 
-#define OSTD_HASH_BASIC(T) template<> struct ToHash<T>: detail::ToHashBase<T> {};
+#define OSTD_HASH_BASIC(T) \
+template<> \
+struct ToHash<T>: detail::ToHashBase<T> {};
 
 OSTD_HASH_BASIC(bool)
 OSTD_HASH_BASIC(char)
@@ -249,13 +268,15 @@ OSTD_HASH_BASIC(Wchar)
 #undef OSTD_HASH_BASIC
 
 namespace detail {
-    template<Size E> struct FnvConstants {
+    template<Size E>
+    struct FnvConstants {
         static constexpr Size prime = 16777619u;
         static constexpr Size offset = 2166136261u;
     };
 
 
-    template<> struct FnvConstants<8> {
+    template<>
+    struct FnvConstants<8> {
         /* conversion is necessary here because when compiling on
          * 32bit, compilers will complain, despite this template
          * not being instantiated...
@@ -278,7 +299,8 @@ namespace detail {
     template<typename T, Size = sizeof(T) / sizeof(Size)>
     struct ScalarHash;
 
-    template<typename T> struct ScalarHash<T, 0> {
+    template<typename T>
+    struct ScalarHash<T, 0> {
         using Argument = T;
         using Result = Size;
 
@@ -290,7 +312,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct ScalarHash<T, 1> {
+    template<typename T>
+    struct ScalarHash<T, 1> {
         using Argument = T;
         using Result = Size;
 
@@ -301,7 +324,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct ScalarHash<T, 2> {
+    template<typename T>
+    struct ScalarHash<T, 2> {
         using Argument = T;
         using Result = Size;
 
@@ -312,7 +336,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct ScalarHash<T, 3> {
+    template<typename T>
+    struct ScalarHash<T, 3> {
         using Argument = T;
         using Result = Size;
 
@@ -323,7 +348,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct ScalarHash<T, 4> {
+    template<typename T>
+    struct ScalarHash<T, 4> {
         using Argument = T;
         using Result = Size;
 
@@ -335,26 +361,33 @@ namespace detail {
     };
 } /* namespace detail */
 
-template<> struct ToHash<llong>: detail::ScalarHash<llong> {};
-template<> struct ToHash<ullong>: detail::ScalarHash<ullong> {};
+template<>
+struct ToHash<llong>: detail::ScalarHash<llong> {};
+template<>
+struct ToHash<ullong>: detail::ScalarHash<ullong> {};
 
-template<> struct ToHash<float>: detail::ScalarHash<float> {
+template<>
+struct ToHash<float>: detail::ScalarHash<float> {
     Size operator()(float v) const {
         if (v == 0) return 0;
         return detail::ScalarHash<float>::operator()(v);
     }
 };
 
-template<> struct ToHash<double>: detail::ScalarHash<double> {
+template<>
+struct ToHash<double>: detail::ScalarHash<double> {
     Size operator()(double v) const {
         if (v == 0) return 0;
         return detail::ScalarHash<double>::operator()(v);
     }
 };
 
-template<> struct ToHash<ldouble>: detail::ScalarHash<ldouble> {
+template<>
+struct ToHash<ldouble>: detail::ScalarHash<ldouble> {
     Size operator()(ldouble v) const {
-        if (v == 0) return 0;
+        if (v == 0) {
+            return 0;
+        }
 #ifdef __i386__
         union { ldouble v; struct { Size h1, h2, h3, h4; }; } u;
         u.h1 = u.h2 = u.h3 = u.h4 = 0;
@@ -385,7 +418,8 @@ namespace detail {
         }
     };
 
-    template<typename T> struct ToHashPtr<T, true> {
+    template<typename T>
+    struct ToHashPtr<T, true> {
         using Argument = T *;
         using Result = Size;
         Size operator()(T *v) const {
@@ -394,7 +428,8 @@ namespace detail {
     };
 }
 
-template<typename T> struct ToHash<T *>: detail::ToHashPtr<T> {};
+template<typename T>
+struct ToHash<T *>: detail::ToHashPtr<T> {};
 
 template<typename T>
 typename ToHash<T>::Result to_hash(T const &v) {
@@ -428,7 +463,8 @@ template<typename T>
 ReferenceWrapper<T> ref(ReferenceWrapper<T> v) {
     return ReferenceWrapper<T>(v);
 }
-template<typename T> void ref(T const &&) = delete;
+template<typename T>
+void ref(T const &&) = delete;
 
 template<typename T>
 ReferenceWrapper<T const> cref(T const &v) {
@@ -438,12 +474,14 @@ template<typename T>
 ReferenceWrapper<T const> cref(ReferenceWrapper<T> v) {
     return ReferenceWrapper<T>(v);
 }
-template<typename T> void cref(T const &&) = delete;
+template<typename T>
+void cref(T const &&) = delete;
 
 /* mem_fn */
 
 namespace detail {
-    template<typename, typename> struct MemTypes;
+    template<typename, typename>
+    struct MemTypes;
     template<typename T, typename R, typename ...A>
     struct MemTypes<T, R(A...)> {
         using Result = R;
@@ -474,22 +512,26 @@ namespace detail {
         MemFn(R T::*ptr): p_ptr(ptr) {}
         template<typename... A>
         auto operator()(T &obj, A &&...args) ->
-          decltype(((obj).*(p_ptr))(forward<A>(args)...)) {
+            decltype(((obj).*(p_ptr))(forward<A>(args)...))
+        {
             return ((obj).*(p_ptr))(forward<A>(args)...);
         }
         template<typename... A>
         auto operator()(T const &obj, A &&...args) ->
-          decltype(((obj).*(p_ptr))(forward<A>(args)...)) const {
+            decltype(((obj).*(p_ptr))(forward<A>(args)...))
+        const {
             return ((obj).*(p_ptr))(forward<A>(args)...);
         }
         template<typename... A>
         auto operator()(T *obj, A &&...args) ->
-          decltype(((obj)->*(p_ptr))(forward<A>(args)...)) {
+            decltype(((obj)->*(p_ptr))(forward<A>(args)...))
+        {
             return ((obj)->*(p_ptr))(forward<A>(args)...);
         }
         template<typename... A>
         auto operator()(T const *obj, A &&...args) ->
-          decltype(((obj)->*(p_ptr))(forward<A>(args)...)) const {
+            decltype(((obj)->*(p_ptr))(forward<A>(args)...))
+        const {
             return ((obj)->*(p_ptr))(forward<A>(args)...);
         }
     };
@@ -504,7 +546,8 @@ detail::MemFn<R, T> mem_fn(R T:: *ptr) {
  * reference: http://probablydance.com/2013/01/13/a-faster-implementation-of-stdfunction
  */
 
-template<typename> struct Function;
+template<typename>
+struct Function;
 
 namespace detail {
     struct FunctorData {
@@ -512,9 +555,9 @@ namespace detail {
     };
 
     template<typename T>
-    constexpr bool FunctorInPlace = sizeof(T) <= sizeof(FunctorData) &&
-                                    (alignof(FunctorData) % alignof(T)) == 0 &&
-                                    IsMoveConstructible<T>;
+    constexpr bool FunctorInPlace =
+        sizeof(T) <= sizeof(FunctorData) &&
+        (alignof(FunctorData) % alignof(T)) == 0 && IsMoveConstructible<T>;
 
     struct FunctionManager;
 
@@ -547,7 +590,8 @@ namespace detail {
         template<typename R, typename ...Args>
         static R call(FunctorData const &s, Args ...args) {
             return (*reinterpret_cast<T *>(&const_cast<FunctorData &>(s)))(
-                forward<Args>(args)...);
+                forward<Args>(args)...
+            );
         }
 
         static void store_f(FmStorage &s, T v) {
@@ -577,7 +621,8 @@ namespace detail {
         template<typename R, typename ...Args>
         static R call(FunctorData const &s, Args ...args) {
             return (*reinterpret_cast<AllocatorPointer<A> &>(
-                const_cast<FunctorData &>(s)))(forward<Args>(args)...);
+                const_cast<FunctorData &>(s))
+            )(forward<Args>(args)...);
         }
 
         static void store_f(FmStorage &s, T v) {
@@ -594,7 +639,9 @@ namespace detail {
 
         static void destroy_f(A &a, FmStorage &s) {
             AllocatorPointer<A> &ptr = get_ptr_ref(s);
-            if (!ptr) return;
+            if (!ptr) {
+                return;
+            }
             allocator_destroy(a, ptr);
             allocator_deallocate(a, ptr, 1);
             ptr = nullptr;
@@ -610,7 +657,8 @@ namespace detail {
 
         static AllocatorPointer<A> &get_ptr_ref(FmStorage const &s) {
             return reinterpret_cast<AllocatorPointer<A> &>(
-                const_cast<FunctorData &>(s.data));
+                const_cast<FunctorData &>(s.data)
+            );
         }
     };
 
@@ -634,17 +682,19 @@ namespace detail {
             };
         }
 
-        void (* const call_move_and_destroyf)(FmStorage &lhs,
-            FmStorage &&rhs);
-        void (* const call_copyf)(FmStorage &lhs,
-            FmStorage const &rhs);
-        void (* const call_copyf_fo)(FmStorage &lhs,
-            FmStorage const &rhs);
+        void (* const call_move_and_destroyf)(
+            FmStorage &lhs, FmStorage &&rhs
+        );
+        void (* const call_copyf)(
+            FmStorage &lhs, FmStorage const &rhs
+        );
+        void (* const call_copyf_fo)(
+            FmStorage &lhs, FmStorage const &rhs
+        );
         void (* const call_destroyf)(FmStorage &s);
 
         template<typename T, typename A>
-        static void call_move_and_destroy(FmStorage &lhs,
-                                          FmStorage &&rhs) {
+        static void call_move_and_destroy(FmStorage &lhs, FmStorage &&rhs) {
             using Spec = FunctorDataManager<T, A>;
             Spec::move_f(lhs, move(rhs));
             Spec::destroy_f(rhs.get_alloc<A>(), rhs);
@@ -653,16 +703,14 @@ namespace detail {
         }
 
         template<typename T, typename A>
-        static void call_copy(FmStorage &lhs,
-                              FmStorage const &rhs) {
+        static void call_copy(FmStorage &lhs, FmStorage const &rhs) {
             using Spec = FunctorDataManager<T, A>;
             create_fm<T, A>(lhs, A(rhs.get_alloc<A>()));
             Spec::store_f(lhs, Spec::get_ref(rhs));
         }
 
         template<typename T, typename A>
-        static void call_copy_fo(FmStorage &lhs,
-                                 FmStorage const &rhs) {
+        static void call_copy_fo(FmStorage &lhs, FmStorage const &rhs) {
             using Spec = FunctorDataManager<T, A>;
             Spec::store_f(lhs, Spec::get_ref(rhs));
         }
@@ -677,8 +725,8 @@ namespace detail {
 
     template<typename T, typename A>
     inline static FunctionManager const &get_default_fm() {
-        static FunctionManager const def_manager
-            = FunctionManager::create_default_manager<T, A>();
+        static FunctionManager const def_manager =
+            FunctionManager::create_default_manager<T, A>();
         return def_manager;
     }
 
@@ -726,14 +774,15 @@ namespace detail {
     struct ValidFunctorNat {};
 
     template<typename U, typename ...A>
-    static decltype(func_to_functor(declval<U>()) (declval<A>()...))
-        valid_functor_test(U *);
+    static decltype(
+        func_to_functor(declval<U>()) (declval<A>()...)
+    ) valid_functor_test(U *);
     template<typename, typename ...>
     static ValidFunctorNat valid_functor_test(...);
 
     template<typename T, typename R, typename ...A>
-    constexpr bool IsValidFunctor<T, R(A...)>
-        = IsConvertible<decltype(valid_functor_test<T, A...>(nullptr)), R>;
+    constexpr bool IsValidFunctor<T, R(A...)> =
+        IsConvertible<decltype(valid_functor_test<T, A...>(nullptr)), R>;
 
     template<typename T>
     using FunctorType = decltype(func_to_functor(declval<T>()));
@@ -755,13 +804,15 @@ struct Function<R(Args...)>: detail::FunctionBase<R, Args...> {
 
     template<typename T, typename = EnableIf<
         detail::IsValidFunctor<T, R(Args...)>
-    >> Function(T f) {
+    >>
+    Function(T f) {
         if (func_is_null(f)) {
             init_empty();
             return;
         }
-        initialize(detail::func_to_functor(forward<T>(f)),
-            Allocator<detail::FunctorType<T>>());
+        initialize(detail::func_to_functor(
+            forward<T>(f)), Allocator<detail::FunctorType<T>>()
+        );
     }
 
     template<typename A>
@@ -778,9 +829,10 @@ struct Function<R(Args...)>: detail::FunctionBase<R, Args...> {
 
     template<typename A>
     Function(AllocatorArg, A const &a, Function const &f):
-    p_call(f.p_call) {
-        detail::FunctionManager const *mfa
-            = &detail::get_default_fm<AllocatorValue<A>, A>();
+        p_call(f.p_call)
+    {
+        detail::FunctionManager const *mfa =
+            &detail::get_default_fm<AllocatorValue<A>, A>();
         if (f.p_stor.manager == mfa) {
             detail::create_fm<AllocatorValue<A>, A>(p_stor, A(a));
             mfa->call_copyf_fo(p_stor, f.p_stor);
@@ -788,8 +840,8 @@ struct Function<R(Args...)>: detail::FunctionBase<R, Args...> {
         }
 
         using AA = AllocatorRebind<A, Function>;
-        detail::FunctionManager const *mff
-            = &detail::get_default_fm<Function, AA>();
+        detail::FunctionManager const *mff =
+            &detail::get_default_fm<Function, AA>();
         if (f.p_stor.manager == mff) {
             detail::create_fm<Function, AA>(p_stor, AA(a));
             mff->call_copyf_fo(p_stor, f.P_stor);
@@ -801,7 +853,8 @@ struct Function<R(Args...)>: detail::FunctionBase<R, Args...> {
 
     template<typename A, typename T, typename = EnableIf<
         detail::IsValidFunctor<T, R(Args...)>
-    >> Function(AllocatorArg, A const &a, T f) {
+    >>
+    Function(AllocatorArg, A const &a, T f) {
         if (func_is_null(f)) {
             init_empty();
             return;
@@ -860,8 +913,7 @@ private:
         using emptya = Allocator<emptyf>;
         p_call = nullptr;
         detail::create_fm<emptyf, emptya>(p_stor, emptya());
-        detail::FunctorDataManager<emptyf, emptya>::store_f(p_stor,
-            nullptr);
+        detail::FunctorDataManager<emptyf, emptya>::store_f(p_stor, nullptr);
     }
 
     template<typename T>
@@ -922,9 +974,10 @@ namespace detail {
         using Type = typename DcLambdaTypes<F>::Ptr;
     };
 
-    template<typename F, bool = IsDefaultConstructible<F> &&
-                                IsMoveConstructible<F>
-    > struct DcFuncTypeObj {
+    template<typename F, bool =
+        IsDefaultConstructible<F> && IsMoveConstructible<F>
+    >
+    struct DcFuncTypeObj {
         using Type = typename DcFuncTypeObjBase<F>::Type;
     };
 
@@ -944,8 +997,8 @@ namespace detail {
     };
 }
 
-template<typename F> using FunctionMakeDefaultConstructible
-    = typename detail::DcFuncType<F>::Type;
+template<typename F>
+using FunctionMakeDefaultConstructible = typename detail::DcFuncType<F>::Type;
 
 } /* namespace ostd */
 
diff --git a/ostd/initializer_list.hh b/ostd/initializer_list.hh
index b6ec393..14e0fb2 100644
--- a/ostd/initializer_list.hh
+++ b/ostd/initializer_list.hh
@@ -36,7 +36,8 @@ public:
 
 namespace ostd {
 
-template<typename T> using InitializerList = std::initializer_list<T>;
+template<typename T>
+using InitializerList = std::initializer_list<T>;
 
 template<typename T>
 PointerRange<T const> iter(std::initializer_list<T> init) {
diff --git a/ostd/internal/hashtable.hh b/ostd/internal/hashtable.hh
index a60acc3..4f9d21c 100644
--- a/ostd/internal/hashtable.hh
+++ b/ostd/internal/hashtable.hh
@@ -26,15 +26,15 @@ namespace detail {
     };
 
     template<typename R>
-    static inline Size estimate_hrsize(const R &range,
-        EnableIf<IsFiniteRandomAccessRange<R>, bool> = true
+    static inline Size estimate_hrsize(
+        const R &range, EnableIf<IsFiniteRandomAccessRange<R>, bool> = true
     ) {
         return range.size();
     }
 
     template<typename R>
-    static inline Size estimate_hrsize(const R &,
-        EnableIf<!IsFiniteRandomAccessRange<R>, bool> = true
+    static inline Size estimate_hrsize(
+        const R &, EnableIf<!IsFiniteRandomAccessRange<R>, bool> = true
     ) {
         /* we have no idea how big the range actually is */
         return 16;
@@ -55,9 +55,13 @@ public:
     HashRange(Chain *node): p_node(node) {}
 
     template<typename U>
-    HashRange(const HashRange<U> &v, EnableIf<
-        IsSame<RemoveCv<T>, RemoveCv<U>> && IsConvertible<U *, T *>, bool
-    > = true): p_node(const_cast<Chain *>(v.p_node)) {}
+    HashRange(
+        const HashRange<U> &v, EnableIf<
+            IsSame<RemoveCv<T>, RemoveCv<U>> && IsConvertible<U *, T *>, bool
+        > = true
+    ):
+        p_node(const_cast<Chain *>(v.p_node))
+    {}
 
     HashRange &operator=(const HashRange &v) {
         p_node = v.p_node;
@@ -67,7 +71,9 @@ public:
     bool empty() const { return !p_node; }
 
     bool pop_front() {
-        if (!p_node) return false;
+        if (!p_node) {
+            return false;
+        }
         p_node = p_node->next;
         return true;
     }
@@ -93,10 +99,14 @@ public:
     BucketRange(const BucketRange &v): p_node(v.p_node), p_end(v.p_end) {}
 
     template<typename U>
-    BucketRange(const BucketRange<U> &v, EnableIf<
-        IsSame<RemoveCv<T>, RemoveCv<U>> && IsConvertible<U *, T *>, bool
-    > = true): p_node(const_cast<Chain *>(v.p_node)),
-                p_end(const_cast<Chain *>(v.p_end)) {}
+    BucketRange(
+        const BucketRange<U> &v, EnableIf<
+            IsSame<RemoveCv<T>, RemoveCv<U>> && IsConvertible<U *, T *>, bool
+        > = true
+    ):
+        p_node(const_cast<Chain *>(v.p_node)),
+        p_end(const_cast<Chain *>(v.p_end))
+    {}
 
     BucketRange &operator=(const BucketRange &v) {
         p_node = v.p_node;
@@ -107,7 +117,9 @@ public:
     bool empty() const { return p_node == p_end; }
 
     bool pop_front() {
-        if (p_node == p_end) return false;
+        if (p_node == p_end) {
+            return false;
+        }
         p_node = p_node->next;
         return true;
     }
@@ -131,8 +143,8 @@ namespace detail {
     static constexpr Size ChunkLowerBound = 32;
     static constexpr Size ChunkUpperBound = 128;
 
-    template<typename E, Size N> constexpr Size HashChainAlign
-        = (((sizeof(HashChain<E>[N]) + sizeof(void *)) % CacheLineSize) == 0)
+    template<typename E, Size N> constexpr Size HashChainAlign =
+        (((sizeof(HashChain<E>[N]) + sizeof(void *)) % CacheLineSize) == 0)
             ? N : HashChainAlign<E, N + 1>;
 
     template<typename E>
@@ -152,9 +164,11 @@ namespace detail {
     template<Size N>
     struct HashPad: HashChainPad<N, N % CacheLineSize == 0> {};
 
-    template<typename E, Size V = HashChainAlign<E, ChunkLowerBound>,
-             bool P = (V == ChunkUpperBound)
-    > struct HashChunk;
+    template<
+        typename E, Size V = HashChainAlign<E, ChunkLowerBound>,
+        bool P = (V == ChunkUpperBound)
+    >
+    struct HashChunk;
 
     template<typename E, Size V>
     struct HashChunk<E, V, false> {
@@ -181,7 +195,8 @@ namespace detail {
         typename C, /* equality check */
         typename A, /* allocator */
         bool Multihash
-    > struct Hashtable {
+    >
+    struct Hashtable {
 private:
         using Chain = HashChain<E>;
         using Chunk = HashChunk<E>;
@@ -220,12 +235,16 @@ private:
         }
 
         Chain *find(const K &key, Size &h) const {
-            if (!p_size) return nullptr;
+            if (!p_size) {
+                return nullptr;
+            }
             h = bucket(key);
             Chain **cp = p_data.first();
-            for (Chain *c = cp[h], *e = cp[h + 1]; c != e; c = c->next)
-                if (get_eq()(key, B::get_key(c->value)))
+            for (Chain *c = cp[h], *e = cp[h + 1]; c != e; c = c->next) {
+                if (get_eq()(key, B::get_key(c->value))) {
                     return c;
+                }
+            }
             return nullptr;
         }
 
@@ -236,18 +255,28 @@ private:
             if (it) {
                 c->prev = it->prev;
                 it->prev = c;
-                if (c->prev) c->prev->next = c;
+                if (c->prev) {
+                    c->prev->next = c;
+                }
             } else {
                 size_t nb = h;
-                while (nb && !cp[nb]) --nb;
+                while (nb && !cp[nb]) {
+                    --nb;
+                }
                 Chain *prev = cp[nb];
-                while (prev && prev->next) prev = prev->next;
+                while (prev && prev->next) {
+                    prev = prev->next;
+                }
                 c->prev = prev;
-                if (prev) prev->next = c;
+                if (prev) {
+                    prev->next = c;
+                }
             }
             for (; it == cp[h]; --h) {
                 cp[h] = c;
-                if (!h) break;
+                if (!h) {
+                    break;
+                }
             }
             return c;
         }
@@ -258,8 +287,9 @@ private:
                 allocator_construct(get_challoc(), chunk);
                 chunk->next = p_chunks;
                 p_chunks = chunk;
-                for (Size i = 0; i < (Chunk::num - 1); ++i)
+                for (Size i = 0; i < (Chunk::num - 1); ++i) {
                     chunk->chains[i].next = &chunk->chains[i + 1];
+                }
                 chunk->chains[Chunk::num - 1].next = p_unused;
                 p_unused = chunk->chains;
             }
@@ -282,10 +312,11 @@ private:
         }
 
         void rehash_ahead(Size n) {
-            if (!bucket_count())
+            if (!bucket_count()) {
                 reserve(n);
-            else if ((float(size() + n) / bucket_count()) > max_load_factor())
+            } else if ((float(size() + n) / bucket_count()) > max_load_factor()) {
                 rehash(Size((size() + 1) / max_load_factor()) * 2);
+            }
         }
 
 protected:
@@ -299,7 +330,9 @@ protected:
         T &access_or_insert(const K &key) {
             Size h = 0;
             Chain *c = find(key, h);
-            if (c) return B::get_data(c->value);
+            if (c) {
+                return B::get_data(c->value);
+            }
             rehash_ahead(1);
             return insert(bucket(key), key);
         }
@@ -307,7 +340,9 @@ protected:
         T &access_or_insert(K &&key) {
             Size h = 0;
             Chain *c = find(key, h);
-            if (c) return B::get_data(c->value);
+            if (c) {
+                return B::get_data(c->value);
+            }
             rehash_ahead(1);
             return insert(bucket(key), move(key));
         }
@@ -315,7 +350,9 @@ protected:
         T *access(const K &key) const {
             Size h;
             Chain *c = find(key, h);
-            if (c) return &B::get_data(c->value);
+            if (c) {
+                return &B::get_data(c->value);
+            }
             return nullptr;
         }
 
@@ -323,8 +360,9 @@ protected:
         void assign_range(R range) {
             clear();
             reserve_at_least(detail::estimate_hrsize(range));
-            for (; !range.empty(); range.pop_front())
+            for (; !range.empty(); range.pop_front()) {
                 emplace(range.front());
+            }
             rehash_up();
         }
 
@@ -332,8 +370,9 @@ protected:
             const E *beg = il.begin(), *end = il.end();
             clear();
             reserve_at_least(end - beg);
-            while (beg != end)
+            while (beg != end) {
                 emplace(*beg++);
+            }
         }
 
         const H &get_hash() const { return p_data.second().second().first(); }
@@ -357,7 +396,9 @@ protected:
         p_data(nullptr, FAPair(AllocPair(alloc, CoreAllocPair(alloc, alloc)),
             FuncPair(hf, eqf))),
         p_maxlf(1.0f) {
-            if (!size) return;
+            if (!size) {
+                return;
+            }
             init_buckets();
         }
 
@@ -366,7 +407,9 @@ protected:
         p_data(nullptr, FAPair(AllocPair(alloc, CoreAllocPair(alloc, alloc)),
             FuncPair(ht.get_hash(), ht.get_eq()))),
         p_maxlf(ht.p_maxlf) {
-            if (!p_size) return;
+            if (!p_size) {
+                return;
+            }
             init_buckets();
             Chain **och = ht.p_data.first();
             for (Chain *oc = *och; oc; oc = oc->next) {
@@ -418,16 +461,18 @@ protected:
             clear();
             if (AllocatorPropagateOnContainerCopyAssignment<A>) {
                 if ((get_cpalloc() != ht.get_cpalloc()) && p_size) {
-                    allocator_deallocate(get_cpalloc(),
-                        p_data.first(), p_size + 1);
+                    allocator_deallocate(
+                        get_cpalloc(), p_data.first(), p_size + 1
+                    );
                     init_buckets();
                 }
                 get_alloc() = ht.get_alloc();
                 get_cpalloc() = ht.get_cpalloc();
                 get_challoc() = ht.get_challoc();
             }
-            for (ConstRange range = ht.iter(); !range.empty(); range.pop_front())
+            for (ConstRange range = ht.iter(); !range.empty(); range.pop_front()) {
                 emplace(range.front());
+            }
             return *this;
         }
 
@@ -439,19 +484,24 @@ protected:
             swap_adl(p_unused, ht.p_unused);
             swap_adl(p_data.first(), ht.p_data.first());
             swap_adl(p_data.second().second(), ht.p_data.second().second());
-            if (AllocatorPropagateOnContainerMoveAssignment<A>)
+            if (AllocatorPropagateOnContainerMoveAssignment<A>) {
                 swap_adl(p_data.second().first(), ht.p_data.second().first());
+            }
             return *this;
         }
 
         void rehash_up() {
-            if (load_factor() <= max_load_factor()) return;
+            if (load_factor() <= max_load_factor()) {
+                return;
+            }
             rehash(Size(size() / max_load_factor()) * 2);
         }
 
         void reserve_at_least(Size count) {
             Size nc = Size(ceil(count / max_load_factor()));
-            if (p_size > nc) return;
+            if (p_size > nc) {
+                return;
+            }
             rehash(nc);
         }
 
@@ -462,14 +512,16 @@ protected:
             swap_adl(p_unused, ht.p_unused);
             swap_adl(p_data.first(), ht.p_data.first());
             swap_adl(p_data.second().second(), ht.p_data.second().second());
-            if (AllocatorPropagateOnContainerSwap<A>)
+            if (AllocatorPropagateOnContainerSwap<A>) {
                 swap_adl(p_data.second().first(), ht.p_data.second().first());
+            }
         }
 
 public:
         ~Hashtable() {
-            if (p_size) allocator_deallocate(get_cpalloc(),
-                p_data.first(), p_size + 1);
+            if (p_size) {
+                allocator_deallocate(get_cpalloc(), p_data.first(), p_size + 1);
+            }
             delete_chunks(p_chunks);
         }
 
@@ -478,7 +530,9 @@ public:
         }
 
         void clear() {
-            if (!p_len) return;
+            if (!p_len) {
+                return;
+            }
             clear_buckets();
             p_len = 0;
             p_unused = nullptr;
@@ -498,10 +552,13 @@ public:
 
         Size bucket_size(Size n) const {
             Size ret = 0;
-            if (n >= p_size) return ret;
+            if (n >= p_size) {
+                return ret;
+            }
             Chain **cp = p_data.first();
-            for (Chain *c = cp[n], *e = cp[n + 1]; c != e; c = c->next)
+            for (Chain *c = cp[n], *e = cp[n + 1]; c != e; c = c->next) {
                 ++ret;
+            }
             return ret;
         }
 
@@ -540,26 +597,38 @@ public:
         Size erase(const K &key) {
             Size h = 0;
             Chain *c = find(key, h);
-            if (!c) return 0;
+            if (!c) {
+                return 0;
+            }
             Chain **cp = p_data.first();
             Size olen = p_len;
             for (Chain *e = cp[h + 1]; c != e; c = c->next) {
-                if (!get_eq()(key, B::get_key(c->value))) break;
+                if (!get_eq()(key, B::get_key(c->value))) {
+                    break;
+                }
                 --p_len;
                 Size hh = h;
                 Chain *next = c->next;
                 for (; cp[hh] == c; --hh) {
                     cp[hh] = next;
-                    if (!hh) break;
+                    if (!hh) {
+                        break;
+                    }
+                }
+                if (c->prev) {
+                    c->prev->next = next;
+                }
+                if (next) {
+                    next->prev = c->prev;
                 }
-                if (c->prev) c->prev->next = next;
-                if (next) next->prev = c->prev;
                 c->next = p_unused;
                 c->prev = nullptr;
                 p_unused = c;
                 allocator_destroy(get_alloc(), &c->value);
                 allocator_construct(get_alloc(), &c->value);
-                if (!Multihash) return 1;
+                if (!Multihash) {
+                    return 1;
+                }
             }
             return olen - p_len;
         }
@@ -567,11 +636,18 @@ public:
         Size count(const K &key) {
             Size h = 0;
             Chain *c = find(key, h);
-            if (!c) return 0;
+            if (!c) {
+                return 0;
+            }
             Size ret = 1;
-            if (!Multihash) return ret;
-            for (c = c->next; c; c = c->next)
-                if (get_eq()(key, B::get_key(c->value))) ++ret;
+            if (!Multihash) {
+                return ret;
+            }
+            for (c = c->next; c; c = c->next) {
+                if (get_eq()(key, B::get_key(c->value))) {
+                    ++ret;
+                }
+            }
             return ret;
         }
 
@@ -582,7 +658,9 @@ public:
 
         ConstRange find(const K &key) const {
             Size h = 0;
-            return ConstRange(reinterpret_cast<detail::HashChain<const E> *>(find(key, h)));
+            return ConstRange(reinterpret_cast<detail::HashChain<const E> *>(
+                find(key, h)
+            ));
         }
 
         float load_factor() const { return float(p_len) / p_size; }
@@ -591,7 +669,9 @@ public:
 
         void rehash(Size count) {
             Size fbcount = Size(p_len / max_load_factor());
-            if (fbcount > count) count = fbcount;
+            if (fbcount > count) {
+                count = fbcount;
+            }
 
             Chain **och = p_data.first();
             Size osize = p_size;
@@ -608,8 +688,9 @@ public:
                 p = pp;
             }
 
-            if (och && osize) allocator_deallocate(get_cpalloc(),
-                och, osize + 1);
+            if (och && osize) {
+                allocator_deallocate(get_cpalloc(), och, osize + 1);
+            }
         }
 
         void reserve(Size count) {
@@ -617,35 +698,51 @@ public:
         }
 
         Range iter() {
-            if (!p_len) return Range();
+            if (!p_len) {
+                return Range();
+            }
             return Range(*p_data.first());
         }
         ConstRange iter() const {
             using Chain = detail::HashChain<const E>;
-            if (!p_len) return ConstRange();
+            if (!p_len) {
+                return ConstRange();
+            }
             return ConstRange(reinterpret_cast<Chain *>(*p_data.first()));
         }
         ConstRange citer() const {
             using Chain = detail::HashChain<const E>;
-            if (!p_len) return ConstRange();
+            if (!p_len) {
+                return ConstRange();
+            }
             return ConstRange(reinterpret_cast<Chain *>(*p_data.first()));
         }
 
         LocalRange iter(Size n) {
-            if (n >= p_size) return LocalRange();
+            if (n >= p_size) {
+                return LocalRange();
+            }
             return LocalRange(p_data.first()[n], p_data.first()[n + 1]);
         }
         ConstLocalRange iter(Size n) const {
             using Chain = detail::HashChain<const E>;
-            if (n >= p_size) return ConstLocalRange();
-            return ConstLocalRange(reinterpret_cast<Chain *>(p_data.first()[n]),
-                                   reinterpret_cast<Chain *>(p_data.first()[n + 1]));
+            if (n >= p_size) {
+                return ConstLocalRange();
+            }
+            return ConstLocalRange(
+                reinterpret_cast<Chain *>(p_data.first()[n]),
+                reinterpret_cast<Chain *>(p_data.first()[n + 1])
+            );
         }
         ConstLocalRange citer(Size n) const {
             using Chain = detail::HashChain<const E>;
-            if (n >= p_size) return ConstLocalRange();
-            return ConstLocalRange(reinterpret_cast<Chain *>(p_data.first()[n]),
-                                   reinterpret_cast<Chain *>(p_data.first()[n + 1]));
+            if (n >= p_size) {
+                return ConstLocalRange();
+            }
+            return ConstLocalRange(
+                reinterpret_cast<Chain *>(p_data.first()[n]),
+                reinterpret_cast<Chain *>(p_data.first()[n + 1])
+            );
         }
     };
 } /* namespace detail */
diff --git a/ostd/internal/mutex.hh b/ostd/internal/mutex.hh
index 0145c88..2dab1a4 100644
--- a/ostd/internal/mutex.hh
+++ b/ostd/internal/mutex.hh
@@ -92,7 +92,9 @@ struct UniqueLock {
     UniqueLock(MutexType &m, AdoptLock): p_mtx(&m), p_owns(true) {}
 
     ~UniqueLock() {
-        if (p_owns) p_mtx->unlock();
+        if (p_owns) {
+            p_mtx->unlock();
+        }
     }
 
     UniqueLock(const UniqueLock &) = delete;
@@ -104,7 +106,9 @@ struct UniqueLock {
     }
 
     UniqueLock &operator=(UniqueLock &&u) {
-        if (p_owns) p_mtx->unlock();
+        if (p_owns) {
+            p_mtx->unlock();
+        }
         p_mtx = u.p_mtx;
         p_owns = u.p_owns;
         u.p_mtx = nullptr;
@@ -113,24 +117,27 @@ struct UniqueLock {
     }
 
     bool lock() {
-        if (!p_mtx || p_owns) return false;
-        bool ret = p_mtx->lock();
-        if (ret) p_owns = true;
-        return ret;
+        if (!p_mtx || p_owns) {
+            return false;
+        }
+        return (p_owns = p_mtx->lock());
     }
 
     int try_lock() {
-        if (!p_mtx || p_owns) return 1;
+        if (!p_mtx || p_owns) {
+            return 1;
+        }
         int ret = p_mtx->try_lock();
-        if (ret) return ret;
         p_owns = (ret == 0);
         return ret;
     }
 
     bool unlock() {
-        if (!p_mtx || p_owns) return false;
+        if (!p_mtx || !p_owns) {
+            return false;
+        }
         bool ret = p_mtx->unlock();
-        if (ret) p_owns = false;
+        p_owns = !ret;
         return ret;
     }
 
@@ -176,8 +183,9 @@ struct Condition {
     }
 
     bool wait(UniqueLock<Mutex> &l) {
-        if (!l.owns_lock())
+        if (!l.owns_lock()) {
             return false;
+        }
         return !pthread_cond_wait(&p_cnd, l.mutex()->native_handle());
     }
 
diff --git a/ostd/internal/tuple.hh b/ostd/internal/tuple.hh
index fb30f95..c585fd1 100644
--- a/ostd/internal/tuple.hh
+++ b/ostd/internal/tuple.hh
@@ -12,21 +12,29 @@
 
 namespace ostd {
 
-template<typename ...A> class Tuple;
-template<typename T, typename U> struct Pair;
-template<typename T, Size I> struct Array;
+template<typename ...A>
+class Tuple;
+template<typename T, typename U>
+struct Pair;
+template<typename T, Size I>
+struct Array;
 
 /* tuple size */
 
-template<typename T> constexpr Size TupleSize = detail::Undefined<T>();
+template<typename T>
+constexpr Size TupleSize = detail::Undefined<T>();
 
-template<typename T> constexpr Size TupleSize<const T> = TupleSize<T>;
-template<typename T> constexpr Size TupleSize<volatile T> = TupleSize<T>;
-template<typename T> constexpr Size TupleSize<const volatile T> = TupleSize<T>;
+template<typename T>
+constexpr Size TupleSize<const T> = TupleSize<T>;
+template<typename T>
+constexpr Size TupleSize<volatile T> = TupleSize<T>;
+template<typename T>
+constexpr Size TupleSize<const volatile T> = TupleSize<T>;
 
 /* tuple element */
 
-template<Size I, typename T> struct TupleElementBase;
+template<Size I, typename T> 
+struct TupleElementBase;
 template<Size I, typename T>
 struct TupleElementBase<I, const T> {
     using Type = AddConst<typename TupleElementBase<I, T>::Type>;
@@ -45,15 +53,20 @@ using TupleElement = typename TupleElementBase<I, T>::Type;
 
 /* is tuple-like */
 
-template<typename T> constexpr bool IsTupleLike = false;
+template<typename T>
+constexpr bool IsTupleLike = false;
 
-template<typename T> constexpr bool IsTupleLike<const T> = IsTupleLike<T>;
-template<typename T> constexpr bool IsTupleLike<volatile T> = IsTupleLike<T>;
-template<typename T> constexpr bool IsTupleLike<const volatile T> = IsTupleLike<T>;
+template<typename T>
+constexpr bool IsTupleLike<const T> = IsTupleLike<T>;
+template<typename T>
+constexpr bool IsTupleLike<volatile T> = IsTupleLike<T>;
+template<typename T>
+constexpr bool IsTupleLike<const volatile T> = IsTupleLike<T>;
 
 /* tuple specializations */
 
-template<typename ...A> constexpr bool IsTupleLike<Tuple<A...>> = true;
+template<typename ...A>
+constexpr bool IsTupleLike<Tuple<A...>> = true;
 
 template<Size I, typename ...A>
 inline TupleElement<I, Tuple<A...>> &get(Tuple<A...> &);
@@ -69,7 +82,8 @@ inline const TupleElement<I, Tuple<A...>> &&get(const Tuple<A...> &&);
 
 /* pair specializations */
 
-template<typename T, typename U> constexpr bool IsTupleLike<Pair<T, U>> = true;
+template<typename T, typename U>
+constexpr bool IsTupleLike<Pair<T, U>> = true;
 
 template<Size I, typename T, typename U>
 inline TupleElement<I, Pair<T, U>> &get(Pair<T, U> &);
@@ -85,7 +99,8 @@ inline const TupleElement<I, Pair<T, U>> &&get(const Pair<T, U> &&);
 
 /* array specializations */
 
-template<typename T, Size I> constexpr bool IsTupleLike<Array<T, I>> = true;
+template<typename T, Size I>
+constexpr bool IsTupleLike<Array<T, I>> = true;
 
 template<Size I, typename T, Size S>
 inline T &get(Array<T, S> &);
@@ -102,14 +117,16 @@ inline const T &&get(const Array<T, S> &&);
 /* make tuple indices */
 
 namespace detail {
-    template<Size ...> struct TupleIndices {};
+    template<Size ...>
+    struct TupleIndices {};
 
-    template<Size S, typename T, Size E> struct MakeTupleIndicesBase;
+    template<Size S, typename T, Size E>
+    struct MakeTupleIndicesBase;
 
     template<Size S, Size ...I, Size E>
     struct MakeTupleIndicesBase<S, TupleIndices<I...>, E> {
-        using Type = typename MakeTupleIndicesBase<S + 1,
-            TupleIndices<I..., S>, E>::Type;
+        using Type =
+            typename MakeTupleIndicesBase<S + 1, TupleIndices<I..., S>, E>::Type;
     };
 
     template<Size E, Size ...I>
@@ -130,10 +147,12 @@ namespace detail {
 /* tuple types */
 
 namespace detail {
-    template<typename ...T> struct TupleTypes {};
+    template<typename ...T>
+    struct TupleTypes {};
 }
 
-template<Size I> struct TupleElementBase<I, detail::TupleTypes<>> {
+template<Size I>
+struct TupleElementBase<I, detail::TupleTypes<>> {
 public:
     static_assert(I == 0, "TupleElement index out of range");
     static_assert(I != 0, "TupleElement index out of range");
@@ -148,14 +167,15 @@ public:
 template<Size I, typename H, typename ...T>
 struct TupleElementBase<I, detail::TupleTypes<H, T...>> {
 public:
-    using Type = typename TupleElementBase<I - 1,
-        detail::TupleTypes<T...>>::Type;
+    using Type =
+        typename TupleElementBase<I - 1, detail::TupleTypes<T...>>::Type;
 };
 
-template<typename ...T> constexpr Size TupleSize<detail::TupleTypes<T...>>
-    = sizeof...(T);
+template<typename ...T>
+constexpr Size TupleSize<detail::TupleTypes<T...>> = sizeof...(T);
 
-template<typename ...T> constexpr bool IsTupleLike<detail::TupleTypes<T...>> = true;
+template<typename ...T>
+constexpr bool IsTupleLike<detail::TupleTypes<T...>> = true;
 
 /* make tuple types */
 
@@ -166,10 +186,17 @@ namespace detail {
     template<typename ...TS, typename T, Size S, Size E>
     struct MakeTupleTypesBase<TupleTypes<TS...>, T, S, E> {
         using TR = RemoveReference<T>;
-        using Type = typename MakeTupleTypesBase<TupleTypes<TS...,
-            Conditional<IsLvalueReference<T>,
-                TupleElement<S, TR> &,
-                TupleElement<S, TR>>>, T, S + 1, E>::Type;
+        using Type = typename MakeTupleTypesBase<
+            TupleTypes<
+                TS...,
+                Conditional<
+                    IsLvalueReference<T>,
+                    TupleElement<S, TR> &,
+                    TupleElement<S, TR>
+                >
+            >,
+            T, S + 1, E
+        >::Type;
     };
 
     template<typename ...TS, typename T, Size E>
@@ -194,9 +221,11 @@ namespace detail {
     constexpr bool TupleConvertibleBase = false;
 
     template<typename T, typename ...TT, typename U, typename ...UU>
-    constexpr bool TupleConvertibleBase<TupleTypes<T, TT...>, TupleTypes<U, UU...>>
-        = IsConvertible<T, U> && TupleConvertibleBase<TupleTypes<TT...>,
-                                                      TupleTypes<UU...>>;
+    constexpr bool TupleConvertibleBase<
+        TupleTypes<T, TT...>, TupleTypes<U, UU...>
+    > =
+        IsConvertible<T, U> &&
+        TupleConvertibleBase<TupleTypes<TT...>, TupleTypes<UU...>>;
 
     template<>
     constexpr bool TupleConvertibleBase<TupleTypes<>, TupleTypes<>> = true;
@@ -205,17 +234,20 @@ namespace detail {
     constexpr bool TupleConvertibleApply = false;
 
     template<typename T, typename U>
-    constexpr bool TupleConvertibleApply<true, T, U>
-        = TupleConvertibleBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
+    constexpr bool TupleConvertibleApply<true, T, U> =
+        TupleConvertibleBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
 
-    template<typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
-                                     bool = IsTupleLike<U>>
+    template<
+        typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
+        bool = IsTupleLike<U>
+    >
     constexpr bool TupleConvertible = false;
 
     template<typename T, typename U>
-    constexpr bool TupleConvertible<T, U, true, true> = TupleConvertibleApply<
-        TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
-    >;
+    constexpr bool TupleConvertible<T, U, true, true> =
+        TupleConvertibleApply<
+            TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
+        >;
 }
 
 /* tuple constructible */
@@ -225,9 +257,11 @@ namespace detail {
     constexpr bool TupleConstructibleBase = false;
 
     template<typename T, typename ...TT, typename U, typename ...UU>
-    constexpr bool TupleConstructibleBase<TupleTypes<T, TT...>, TupleTypes<U, UU...>>
-        = IsConstructible<U, T> && TupleConstructibleBase<TupleTypes<TT...>,
-                                                          TupleTypes<UU...>>;
+    constexpr bool TupleConstructibleBase<
+        TupleTypes<T, TT...>, TupleTypes<U, UU...>
+    > =
+        IsConstructible<U, T> &&
+        TupleConstructibleBase<TupleTypes<TT...>, TupleTypes<UU...>>;
 
     template<>
     constexpr bool TupleConstructibleBase<TupleTypes<>, TupleTypes<>> = true;
@@ -236,17 +270,20 @@ namespace detail {
     constexpr bool TupleConstructibleApply = false;
 
     template<typename T, typename U>
-    constexpr bool TupleConstructibleApply<true, T, U>
-        = TupleConstructibleBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
+    constexpr bool TupleConstructibleApply<true, T, U> =
+        TupleConstructibleBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
 
-    template<typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
-                                     bool = IsTupleLike<U>>
+    template<
+        typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
+        bool = IsTupleLike<U>
+    >
     constexpr bool TupleConstructible = false;
 
     template<typename T, typename U>
-    constexpr bool TupleConstructible<T, U, true, true> = TupleConstructibleApply<
-        TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
-    >;
+    constexpr bool TupleConstructible<T, U, true, true> =
+        TupleConstructibleApply<
+            TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
+        >;
 }
 
 /* tuple assignable */
@@ -256,9 +293,11 @@ namespace detail {
     constexpr bool TupleAssignableBase = false;
 
     template<typename T, typename ...TT, typename U, typename ...UU>
-    constexpr bool TupleAssignableBase<TupleTypes<T, TT...>, TupleTypes<U, UU...>>
-        = IsAssignable<U &, T> && TupleAssignableBase<TupleTypes<TT...>,
-                                                      TupleTypes<UU...>>;
+    constexpr bool TupleAssignableBase<
+        TupleTypes<T, TT...>, TupleTypes<U, UU...>
+    > =
+        IsAssignable<U &, T> &&
+        TupleAssignableBase<TupleTypes<TT...>, TupleTypes<UU...>>;
 
     template<>
     constexpr bool TupleAssignableBase<TupleTypes<>, TupleTypes<>> = true;
@@ -267,17 +306,20 @@ namespace detail {
     constexpr bool TupleAssignableApply = false;
 
     template<typename T, typename U>
-    constexpr bool TupleAssignableApply<true, T, U>
-        = TupleAssignableBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
+    constexpr bool TupleAssignableApply<true, T, U> =
+        TupleAssignableBase<MakeTupleTypes<T>, MakeTupleTypes<U>>;
 
-    template<typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
-                                     bool = IsTupleLike<U>>
+    template<
+        typename T, typename U, bool = IsTupleLike<RemoveReference<T>>,
+        bool = IsTupleLike<U>
+    >
     constexpr bool TupleAssignable = false;
 
     template<typename T, typename U>
-    constexpr bool TupleAssignable<T, U, true, true> = TupleAssignableApply<
-        TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
-    >;
+    constexpr bool TupleAssignable<T, U, true, true> =
+        TupleAssignableApply<
+            TupleSize<RemoveReference<T>> == TupleSize<U>, T, U
+        >;
 }
 
 } /* namespace ostd */
diff --git a/ostd/io.hh b/ostd/io.hh
index 8e601a4..4a7ac11 100644
--- a/ostd/io.hh
+++ b/ostd/io.hh
@@ -49,7 +49,9 @@ struct FileStream: Stream {
     }
 
     bool open(ConstCharRange path, StreamMode mode = StreamMode::read) {
-        if (p_f || (path.size() > FILENAME_MAX)) return false;
+        if (p_f || (path.size() > FILENAME_MAX)) {
+            return false;
+        }
         char buf[FILENAME_MAX + 1];
         memcpy(buf, &path[0], path.size());
         buf[path.size()] = '\0';
@@ -57,15 +59,18 @@ struct FileStream: Stream {
 #ifndef OSTD_PLATFORM_WIN32
         p_f = fopen(buf, detail::filemodes[Size(mode)]);
 #else
-        if (fopen_s(&p_f, buf, detail::filemodes[Size(mode)]) != 0)
+        if (fopen_s(&p_f, buf, detail::filemodes[Size(mode)]) != 0) {
             return false;
+        }
 #endif
         p_owned = !!p_f;
         return is_open();
     }
 
     bool open(FILE *f) {
-        if (p_f) return false;
+        if (p_f) {
+            return false;
+        }
         p_f = f;
         p_owned = false;
         return is_open();
@@ -75,7 +80,9 @@ struct FileStream: Stream {
     bool is_owned() const { return p_owned; }
 
     void close() {
-        if (p_f && p_owned) fclose(p_f);
+        if (p_f && p_owned) {
+            fclose(p_f);
+        }
         p_f = nullptr;
         p_owned = false;
     }
@@ -144,9 +151,11 @@ namespace detail {
     }
 
     template<typename T>
-    inline void write_impl(T const &v, EnableIf<
-        !IsConstructible<ConstCharRange, T const &>, IoNat
-    > = IoNat()) {
+    inline void write_impl(
+        T const &v, EnableIf<
+            !IsConstructible<ConstCharRange, T const &>, IoNat
+        > = IoNat()
+    ) {
         write(ostd::to_string(v));
     }
 }
@@ -178,10 +187,12 @@ inline void writeln(T const &v, A const &...args) {
 template<typename ...A>
 inline void writef(ConstCharRange fmt, A const &...args) {
     char buf[512];
-    Ptrdiff need = format(detail::FormatOutRange<sizeof(buf)>(buf),
-        fmt, args...);
-    if (need < 0) return;
-    else if (Size(need) < sizeof(buf)) {
+    Ptrdiff need = format(
+        detail::FormatOutRange<sizeof(buf)>(buf), fmt, args...
+    );
+    if (need < 0) {
+        return;
+    } else if (Size(need) < sizeof(buf)) {
         fwrite(buf, 1, need, stdout);
         return;
     }
diff --git a/ostd/keyset.hh b/ostd/keyset.hh
index f7e5051..f1dcdce 100644
--- a/ostd/keyset.hh
+++ b/ostd/keyset.hh
@@ -40,7 +40,8 @@ namespace detail {
 
     template<
         typename T, typename H, typename C, typename A, bool IsMultihash
-    > struct KeysetImpl: detail::Hashtable<detail::KeysetBase<T, A>,
+    >
+    struct KeysetImpl: detail::Hashtable<detail::KeysetBase<T, A>,
         T, KeysetKey<T>, T, H, C, A, IsMultihash
     > {
     private:
@@ -65,20 +66,24 @@ namespace detail {
         using ConstLocalRange = BucketRange<T const>;
         using Allocator = A;
 
-        explicit KeysetImpl(Size size, H const &hf = H(),
-            C const &eqf = C(), A const &alloc = A()
+        explicit KeysetImpl(
+            Size size, H const &hf = H(), C const &eqf = C(),
+            A const &alloc = A()
         ): Base(size, hf, eqf, alloc) {}
 
         KeysetImpl(): KeysetImpl(0) {}
         explicit KeysetImpl(A const &alloc): KeysetImpl(0, H(), C(), alloc) {}
 
         KeysetImpl(Size size, A const &alloc):
-            KeysetImpl(size, H(), C(), alloc) {}
+            KeysetImpl(size, H(), C(), alloc)
+        {}
         KeysetImpl(Size size, H const &hf, A const &alloc):
-            KeysetImpl(size, hf, C(), alloc) {}
+            KeysetImpl(size, hf, C(), alloc)
+        {}
 
-        KeysetImpl(KeysetImpl const &m): Base(m,
-            allocator_container_copy(m.get_alloc())) {}
+        KeysetImpl(KeysetImpl const &m):
+            Base(m, allocator_container_copy(m.get_alloc())
+        {}
 
         KeysetImpl(KeysetImpl const &m, A const &alloc): Base(m, alloc) {}
 
@@ -87,33 +92,45 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> KeysetImpl(R range, Size size = 0, H const &hf = H(),
+        >>
+        KeysetImpl(
+            R range, Size size = 0, H const &hf = H(),
             C const &eqf = C(), A const &alloc = A()
-        ): Base(size ? size : detail::estimate_hrsize(range),
-                   hf, eqf, alloc) {
-            for (; !range.empty(); range.pop_front())
+        ):
+            Base(size ? size : detail::estimate_hrsize(range), hf, eqf, alloc)
+        {
+            for (; !range.empty(); range.pop_front()) {
                 Base::emplace(range.front());
+            }
             Base::rehash_up();
         }
 
         template<typename R>
-        KeysetImpl(R range, Size size, A const &alloc)
-        : KeysetImpl(range, size, H(), C(), alloc) {}
+        KeysetImpl(R range, Size size, A const &alloc):
+            KeysetImpl(range, size, H(), C(), alloc)
+        {}
 
         template<typename R>
-        KeysetImpl(R range, Size size, H const &hf, A const &alloc)
-        : KeysetImpl(range, size, hf, C(), alloc) {}
+        KeysetImpl(R range, Size size, H const &hf, A const &alloc):
+            KeysetImpl(range, size, hf, C(), alloc)
+        {}
 
-        KeysetImpl(InitializerList<Value> init, Size size = 0,
+        KeysetImpl(
+            InitializerList<Value> init, Size size = 0,
             H const &hf = H(), C const &eqf = C(), A const &alloc = A()
-        ): KeysetImpl(iter(init), size, hf, eqf, alloc) {}
+        ):
+            KeysetImpl(iter(init), size, hf, eqf, alloc)
+        {}
 
-        KeysetImpl(InitializerList<Value> init, Size size, A const &alloc)
-        : KeysetImpl(iter(init), size, H(), C(), alloc) {}
+        KeysetImpl(InitializerList<Value> init, Size size, A const &alloc):
+            KeysetImpl(iter(init), size, H(), C(), alloc)
+        {}
 
-        KeysetImpl(InitializerList<Value> init, Size size, H const &hf,
-            A const &alloc
-        ): KeysetImpl(iter(init), size, hf, C(), alloc) {}
+        KeysetImpl(
+            InitializerList<Value> init, Size size, H const &hf, A const &alloc
+        ):
+            KeysetImpl(iter(init), size, hf, C(), alloc)
+        {}
 
         KeysetImpl &operator=(KeysetImpl const &m) {
             Base::operator=(m);
@@ -127,7 +144,8 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> KeysetImpl &operator=(R range) {
+        >>
+        KeysetImpl &operator=(R range) {
             Base::assign_range(range);
             return *this;
         }
@@ -166,14 +184,16 @@ template<
     typename H = ToHash<detail::KeysetKey<T>>,
     typename C = EqualWithCstr<detail::KeysetKey<T>>,
     typename A = Allocator<T>
-> using Keyset = detail::KeysetImpl<T, H, C, A, false>;
+>
+using Keyset = detail::KeysetImpl<T, H, C, A, false>;
 
 template<
     typename T,
     typename H = ToHash<detail::KeysetKey<T>>,
     typename C = EqualWithCstr<detail::KeysetKey<T>>,
     typename A = Allocator<T>
-> using Multikeyset = detail::KeysetImpl<T, H, C, A, true>;
+>
+using Multikeyset = detail::KeysetImpl<T, H, C, A, true>;
 
 } /* namespace ostd */
 
diff --git a/ostd/map.hh b/ostd/map.hh
index 6f61054..131c353 100644
--- a/ostd/map.hh
+++ b/ostd/map.hh
@@ -40,7 +40,8 @@ namespace detail {
     template<
         typename K, typename T, typename H,
         typename C, typename A, bool IsMultihash
-    > struct MapImpl: detail::Hashtable<detail::MapBase<K, T, A>,
+    >
+    struct MapImpl: detail::Hashtable<detail::MapBase<K, T, A>,
         Pair<K const, T>, K, T, H, C, A, IsMultihash
     > {
     private:
@@ -65,20 +66,26 @@ namespace detail {
         using ConstLocalRange = BucketRange<Pair<K const, T> const>;
         using Allocator = A;
 
-        explicit MapImpl(Size size, H const &hf = H(),
+        explicit MapImpl(
+            Size size, H const &hf = H(),
             C const &eqf = C(), A const &alloc = A()
-        ): Base(size, hf, eqf, alloc) {}
+        ):
+            Base(size, hf, eqf, alloc)
+        {}
 
         MapImpl(): MapImpl(0) {}
         explicit MapImpl(A const &alloc): MapImpl(0, H(), C(), alloc) {}
 
         MapImpl(Size size, A const &alloc):
-            MapImpl(size, H(), C(), alloc) {}
+            MapImpl(size, H(), C(), alloc)
+        {}
         MapImpl(Size size, H const &hf, A const &alloc):
-            MapImpl(size, hf, C(), alloc) {}
+            MapImpl(size, hf, C(), alloc)
+        {}
 
-        MapImpl(MapImpl const &m): Base(m,
-            allocator_container_copy(m.get_alloc())) {}
+        MapImpl(MapImpl const &m):
+            Base(m, allocator_container_copy(m.get_alloc()))
+        {}
 
         MapImpl(MapImpl const &m, A const &alloc): Base(m, alloc) {}
 
@@ -87,33 +94,45 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> MapImpl(R range, Size size = 0, H const &hf = H(),
+        >>
+        MapImpl(
+            R range, Size size = 0, H const &hf = H(),
             C const &eqf = C(), A const &alloc = A()
-        ): Base(size ? size : detail::estimate_hrsize(range),
-                   hf, eqf, alloc) {
-            for (; !range.empty(); range.pop_front())
+        ):
+            Base(size ? size : detail::estimate_hrsize(range), hf, eqf, alloc)
+        {
+            for (; !range.empty(); range.pop_front()) {
                 Base::emplace(range.front());
+            }
             Base::rehash_up();
         }
 
         template<typename R>
-        MapImpl(R range, Size size, A const &alloc)
-        : MapImpl(range, size, H(), C(), alloc) {}
+        MapImpl(R range, Size size, A const &alloc):
+            MapImpl(range, size, H(), C(), alloc)
+        {}
 
         template<typename R>
-        MapImpl(R range, Size size, H const &hf, A const &alloc)
-        : MapImpl(range, size, hf, C(), alloc) {}
+        MapImpl(R range, Size size, H const &hf, A const &alloc):
+            MapImpl(range, size, hf, C(), alloc)
+        {}
 
-        MapImpl(InitializerList<Value> init, Size size = 0,
+        MapImpl(
+            InitializerList<Value> init, Size size = 0,
             H const &hf = H(), C const &eqf = C(), A const &alloc = A()
-        ): MapImpl(iter(init), size, hf, eqf, alloc) {}
+        ):
+            MapImpl(iter(init), size, hf, eqf, alloc)
+        {}
 
-        MapImpl(InitializerList<Value> init, Size size, A const &alloc)
-        : MapImpl(iter(init), size, H(), C(), alloc) {}
+        MapImpl(InitializerList<Value> init, Size size, A const &alloc):
+            MapImpl(iter(init), size, H(), C(), alloc)
+        {}
 
-        MapImpl(InitializerList<Value> init, Size size, H const &hf,
-            A const &alloc
-        ): MapImpl(iter(init), size, hf, C(), alloc) {}
+        MapImpl(
+            InitializerList<Value> init, Size size, H const &hf, A const &alloc
+        ):
+            MapImpl(iter(init), size, hf, C(), alloc)
+        {}
 
         MapImpl &operator=(MapImpl const &m) {
             Base::operator=(m);
@@ -127,7 +146,8 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> MapImpl &operator=(R range) {
+        >>
+        MapImpl &operator=(R range) {
             Base::assign_range(range);
             return *this;
         }
@@ -166,14 +186,16 @@ template<
     typename H = ToHash<K>,
     typename C = EqualWithCstr<K>,
     typename A = Allocator<Pair<K const, T>>
-> using Map = detail::MapImpl<K, T, H, C, A, false>;
+>
+using Map = detail::MapImpl<K, T, H, C, A, false>;
 
 template<
     typename K, typename T,
     typename H = ToHash<K>,
     typename C = EqualWithCstr<K>,
     typename A = Allocator<Pair<K const, T>>
-> using Multimap = detail::MapImpl<K, T, H, C, A, true>;
+>
+using Multimap = detail::MapImpl<K, T, H, C, A, true>;
 
 } /* namespace ostd */
 
diff --git a/ostd/maybe.hh b/ostd/maybe.hh
index ae137f3..ad8f464 100644
--- a/ostd/maybe.hh
+++ b/ostd/maybe.hh
@@ -37,22 +37,28 @@ namespace detail {
         constexpr MaybeStorage(): p_null_state('\0') {}
 
         MaybeStorage(MaybeStorage const &v): p_engaged(v.p_engaged) {
-            if (p_engaged) ::new(address_of(p_value)) Value(v.p_value);
+            if (p_engaged) {
+                ::new(address_of(p_value)) Value(v.p_value);
+            }
         }
 
         MaybeStorage(MaybeStorage &&v): p_engaged(v.p_engaged) {
-            if (p_engaged)
+            if (p_engaged) {
                 ::new(address_of(p_value)) Value(move(v.p_value));
+            }
         }
 
         constexpr MaybeStorage(Value const &v): p_value(v), p_engaged(true) {}
         constexpr MaybeStorage(Value &&v): p_value(move(v)), p_engaged(true) {}
 
         template<typename ...A> constexpr MaybeStorage(InPlace, A &&...args):
-            p_value(forward<A>(args)...), p_engaged(true) {}
+            p_value(forward<A>(args)...), p_engaged(true)
+        {}
 
         ~MaybeStorage() {
-            if (p_engaged) p_value.~Value();
+            if (p_engaged) {
+                p_value.~Value();
+            }
         }
     };
 
@@ -69,21 +75,26 @@ namespace detail {
         constexpr MaybeStorage(): p_null_state('\0') {}
 
         MaybeStorage(MaybeStorage const &v): p_engaged(v.p_engaged) {
-            if (p_engaged) ::new(address_of(p_value)) Value(v.p_value);
+            if (p_engaged) {
+                ::new(address_of(p_value)) Value(v.p_value);
+            }
         }
 
         MaybeStorage(MaybeStorage &&v): p_engaged(v.p_engaged) {
-            if (p_engaged)
+            if (p_engaged) {
                 ::new(address_of(p_value)) Value(move(v.p_value));
+            }
         }
 
         constexpr MaybeStorage(Value const &v): p_value(v), p_engaged(true) {}
         constexpr MaybeStorage(Value &&v):
-            p_value(move(v)), p_engaged(true) {}
+            p_value(move(v)), p_engaged(true)
+        {}
 
         template<typename ...A>
         constexpr MaybeStorage(InPlace, A &&...args):
-            p_value(forward<A>(args)...), p_engaged(true) {}
+            p_value(forward<A>(args)...), p_engaged(true)
+        {}
     };
 }
 
@@ -93,16 +104,26 @@ class Maybe: private detail::MaybeStorage<T> {
 public:
     using Value = T;
 
-    static_assert(!IsReference<T>,
-        "Initialization of Maybe with a reference type is not allowed.");
-    static_assert(!IsSame<RemoveCv<T>, InPlace>,
-        "Initialization of Maybe with InPlace is not allowed.");
-    static_assert(!IsSame<RemoveCv<T>, Nothing>,
-        "Initialization of Maybe with Nothing is not allowed.");
-    static_assert(IsObject<T>,
-        "Initialization of Maybe with non-object type is not allowed.");
-    static_assert(IsDestructible<T>,
-        "Initialization of Maybe with a non-destructible object is not allowed.");
+    static_assert(
+        !IsReference<T>,
+        "Initialization of Maybe with a reference type is not allowed."
+    );
+    static_assert(
+        !IsSame<RemoveCv<T>, InPlace>,
+        "Initialization of Maybe with InPlace is not allowed."
+    );
+    static_assert(
+        !IsSame<RemoveCv<T>, Nothing>,
+        "Initialization of Maybe with Nothing is not allowed."
+    );
+    static_assert(
+        IsObject<T>,
+        "Initialization of Maybe with non-object type is not allowed."
+    );
+    static_assert(
+        IsDestructible<T>,
+        "Initialization of Maybe with a non-destructible object is not allowed."
+    );
 
     constexpr Maybe() {}
     Maybe(Maybe const &) = default;
@@ -112,14 +133,16 @@ public:
     constexpr Maybe(Value &&v): Base(move(v)) {}
 
     template<typename ...A, typename = EnableIf<IsConstructible<T, A...>>>
-    constexpr explicit Maybe(InPlace, A &&...args): Base(in_place,
-        forward<A>(args)...) {}
+    constexpr explicit Maybe(InPlace, A &&...args):
+        Base(in_place, forward<A>(args)...)
+    {}
 
     template<typename U, typename ...A, typename = EnableIf<
-        IsConstructible<T, std::initializer_list<U> &, A...>>>
-    constexpr explicit
-    Maybe(InPlace, std::initializer_list<U> il, A &&...args):
-        Base(in_place, il, forward<A>(args)...) {}
+        IsConstructible<T, std::initializer_list<U> &, A...>>
+    >
+    constexpr explicit Maybe(InPlace, std::initializer_list<U> il, A &&...args):
+        Base(in_place, il, forward<A>(args)...)
+    {}
 
     ~Maybe() = default;
 
@@ -133,12 +156,15 @@ public:
 
     Maybe &operator=(Maybe const &v) {
         if (this->p_engaged == v.p_engaged) {
-            if (this->p_engaged) this->p_value = v.p_value;
+            if (this->p_engaged) {
+                this->p_value = v.p_value;
+            }
         } else {
-            if (this->p_engaged)
+            if (this->p_engaged) {
                 this->p_value.~Value();
-            else
+            } else {
                 ::new(address_of(this->p_value)) Value(v.p_value);
+            }
             this->p_engaged = v.p_engaged;
         }
         return *this;
@@ -146,11 +172,13 @@ public:
 
     Maybe &operator=(Maybe &&v) {
         if (this->p_engaged == v.p_engaged) {
-            if (this->p_engaged) this->p_value = move(v.p_value);
+            if (this->p_engaged) {
+                this->p_value = move(v.p_value);
+            }
         } else {
-            if (this->p_engaged)
+            if (this->p_engaged) {
                 this->p_value.~Value();
-            else {
+            } else {
                 ::new(address_of(this->p_value)) Value(move(v.p_value));
             }
             this->p_engaged = v.p_engaged;
@@ -217,26 +245,35 @@ public:
 
     template<typename U>
     constexpr Value value_or(U &&v) const & {
-        static_assert(IsCopyConstructible<Value>,
-            "Maybe<T>::value_or: T must be copy constructible");
-        static_assert(IsConvertible<U, Value>,
-            "Maybe<T>::value_or: U must be convertible to T");
+        static_assert(
+            IsCopyConstructible<Value>,
+            "Maybe<T>::value_or: T must be copy constructible"
+        );
+        static_assert(
+            IsConvertible<U, Value>,
+            "Maybe<T>::value_or: U must be convertible to T"
+        );
         return this->p_engaged ? this->p_value : Value(forward<U>(v));
     }
 
     template<typename U>
     Value value_or(U &&v) && {
-        static_assert(IsMoveConstructible<Value>,
-            "Maybe<T>::value_or: T must be copy constructible");
-        static_assert(IsConvertible<U, Value>,
-            "Maybe<T>::value_or: U must be convertible to T");
-        return this->p_engaged ? move(this->p_value)
-                               : Value(forward<U>(v));
+        static_assert(
+            IsMoveConstructible<Value>,
+            "Maybe<T>::value_or: T must be copy constructible"
+        );
+        static_assert(
+            IsConvertible<U, Value>,
+            "Maybe<T>::value_or: U must be convertible to T"
+        );
+        return this->p_engaged ? move(this->p_value) : Value(forward<U>(v));
     }
 
     void swap(Maybe &v) {
         if (this->p_engaged == v.p_engaged) {
-            if (this->p_engaged) detail::swap_adl(this->p_value, v.p_value);
+            if (this->p_engaged) {
+                detail::swap_adl(this->p_value, v.p_value);
+            }
         } else {
             if (this->p_engaged) {
                 ::new(address_of(v.p_value)) Value(move(this->p_value));
diff --git a/ostd/memory.hh b/ostd/memory.hh
index 71a5abf..2c2e987 100644
--- a/ostd/memory.hh
+++ b/ostd/memory.hh
@@ -16,8 +16,9 @@ namespace ostd {
 /* address of */
 
 template<typename T> constexpr T *address_of(T &v) {
-    return reinterpret_cast<T *>(&const_cast<char &>
-        (reinterpret_cast<char const volatile &>(v)));
+    return reinterpret_cast<T *>(
+        &const_cast<char &>(reinterpret_cast<char const volatile &>(v))
+    );
 }
 
 /* pointer traits */
@@ -25,8 +26,10 @@ template<typename T> constexpr T *address_of(T &v) {
 namespace detail {
     template<typename T>
     struct HasElement {
-        template<typename U> static int test(...);
-        template<typename U> static char test(typename U::Element * = 0);
+        template<typename U>
+        static int test(...);
+        template<typename U>
+        static char test(typename U::Element * = 0);
 
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
@@ -34,7 +37,8 @@ namespace detail {
     template<typename T, bool = HasElement<T>::value>
     struct PointerElementBase;
 
-    template<typename T> struct PointerElementBase<T, true> {
+    template<typename T>
+    struct PointerElementBase<T, true> {
         using Type = typename T::Element;
     };
 
@@ -60,8 +64,10 @@ namespace detail {
 
     template<typename T>
     struct HasDifference {
-        template<typename U> static int test(...);
-        template<typename U> static char test(typename U::Difference * = 0);
+        template<typename U>
+        static int test(...);
+        template<typename U>
+        static char test(typename U::Difference * = 0);
 
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
@@ -71,7 +77,8 @@ namespace detail {
         using Type = Ptrdiff;
     };
 
-    template<typename T> struct PointerDifferenceBase<T, true> {
+    template<typename T>
+    struct PointerDifferenceBase<T, true> {
         using Type = typename T::Difference;
     };
 
@@ -87,9 +94,10 @@ namespace detail {
 
     template<typename T, typename U>
     struct HasRebind {
-        template<typename V> static int test(...);
-        template<typename V> static char test(
-            typename V::template Rebind<U> * = 0);
+        template<typename V>
+        static int test(...);
+        template<typename V>
+        static char test(typename V::template Rebind<U> * = 0);
 
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
@@ -99,14 +107,16 @@ namespace detail {
         using Type = typename T::template Rebind<U>;
     };
 
-    template<template<typename, typename...> class T, typename U,
+    template<
+        template<typename, typename...> class T, typename U,
         typename ...A, typename V
     >
     struct PointerRebindBase<T<U, A...>, V, true> {
         using Type = typename T<U, A...>::template Rebind<V>;
     };
 
-    template<template<typename, typename...> class T, typename U,
+    template<
+        template<typename, typename...> class T, typename U,
         typename ...A, typename V
     >
     struct PointerRebindBase<T<U, A...>, V, false> {
@@ -153,9 +163,11 @@ namespace detail {
 
     template<typename T>
     struct PointerTo {
-        static T pointer_to(Conditional<IsVoid<PointerElement<T>>,
-            PointerToNat, PointerElement<T>
-        > &r) {
+        static T pointer_to(
+            Conditional<
+                IsVoid<PointerElement<T>>, PointerToNat, PointerElement<T>
+            > &r
+        ) {
             return T::pointer_to(r);
         }
     };
@@ -169,9 +181,11 @@ namespace detail {
 }
 
 template<typename T>
-static T pointer_to(Conditional<IsVoid<PointerElement<T>>,
-    detail::PointerToNat, PointerElement<T>
-> &r) {
+static T pointer_to(
+    Conditional<
+        IsVoid<PointerElement<T>>, detail::PointerToNat, PointerElement<T>
+    > &r
+) {
     return detail::PointerTo<T>::pointer_to(r);
 }
 
@@ -181,7 +195,8 @@ template<typename T>
 struct DefaultDelete {
     constexpr DefaultDelete() = default;
 
-    template<typename U> DefaultDelete(DefaultDelete<U> const &) {};
+    template<typename U>
+    DefaultDelete(DefaultDelete<U> const &) {};
 
     void operator()(T *p) const {
         delete p;
@@ -192,12 +207,14 @@ template<typename T>
 struct DefaultDelete<T[]> {
     constexpr DefaultDelete() = default;
 
-    template<typename U> DefaultDelete(DefaultDelete<U[]> const &) {};
+    template<typename U>
+    DefaultDelete(DefaultDelete<U[]> const &) {};
 
     void operator()(T *p) const {
         delete[] p;
     }
-    template<typename U> void operator()(U *) const = delete;
+    template<typename U>
+    void operator()(U *) const = delete;
 };
 
 /* box */
@@ -208,18 +225,21 @@ namespace detail {
     template<typename T>
     static char ptr_test(typename T::Pointer * = 0);
 
-    template<typename T> constexpr bool HasPtr = sizeof(ptr_test<T>(0)) == 1;
+    template<typename T>
+    constexpr bool HasPtr = sizeof(ptr_test<T>(0)) == 1;
 
     template<typename T, typename D, bool = HasPtr<D>>
     struct PointerBase {
         using Type = typename D::Pointer;
     };
 
-    template<typename T, typename D> struct PointerBase<T, D, false> {
+    template<typename T, typename D>
+    struct PointerBase<T, D, false> {
         using Type = T *;
     };
 
-    template<typename T, typename D> struct PointerType {
+    template<typename T, typename D>
+    struct PointerType {
         using Type = typename PointerBase<T, RemoveReference<D>>::Type;
     };
 } /* namespace detail */
@@ -249,20 +269,26 @@ public:
     }
 
     Box(Pointer p, Conditional<IsReference<D>, D, AddLvalueReference<D const>> d):
-        p_stor(p, d) {}
+        p_stor(p, d)
+    {}
 
     Box(Pointer p, RemoveReference<D> &&d):
-    p_stor(p, move(d)) {
+        p_stor(p, move(d))
+    {
         static_assert(!IsReference<D>, "rvalue deleter cannot be a ref");
     }
 
     Box(Box &&u): p_stor(u.release(), forward<D>(u.get_deleter())) {}
 
     template<typename TT, typename DD>
-    Box(Box<TT, DD> &&u, EnableIf<!IsArray<TT>
-        && IsConvertible<typename Box<TT, DD>::Pointer, Pointer>
-        && IsConvertible<DD, D> && (!IsReference<D> || IsSame<D, DD>)
-    > = Nat()): p_stor(u.release(), forward<DD>(u.get_deleter())) {}
+    Box(
+        Box<TT, DD> &&u, EnableIf<
+            !IsArray<TT> &&
+            IsConvertible<typename Box<TT, DD>::Pointer, Pointer> &&
+            IsConvertible<DD, D> && (!IsReference<D> || IsSame<D, DD>),
+            Nat
+        > = Nat()
+    ): p_stor(u.release(), forward<DD>(u.get_deleter())) {}
 
     Box &operator=(Box &&u) {
         reset(u.release());
@@ -271,9 +297,10 @@ public:
     }
 
     template<typename TT, typename DD>
-    EnableIf<!IsArray<TT>
-        && IsConvertible<typename Box<TT, DD>::Pointer, Pointer>
-        && IsAssignable<D &, DD &&>,
+    EnableIf<
+        !IsArray<TT> &&
+        IsConvertible<typename Box<TT, DD>::Pointer, Pointer> &&
+        IsAssignable<D &, DD &&>,
         Box &
     > operator=(Box<TT, DD> &&u) {
         reset(u.release());
@@ -309,7 +336,9 @@ public:
     void reset(Pointer p = nullptr) {
         Pointer tmp = p_stor.first();
         p_stor.first() = p;
-        if (tmp) p_stor.second()(tmp);
+        if (tmp) {
+            p_stor.second()(tmp);
+        }
     }
 
     void swap(Box &u) {
@@ -324,14 +353,16 @@ namespace detail {
     template<typename T, typename U, bool = IsSame<
         RemoveCv<PointerElement<T>>,
         RemoveCv<PointerElement<U>>
-    >> constexpr bool SameOrLessCvQualifiedBase = IsConvertible<T, U>;
+    >>
+    constexpr bool SameOrLessCvQualifiedBase = IsConvertible<T, U>;
 
     template<typename T, typename U>
     constexpr bool SameOrLessCvQualifiedBase<T, U, false> = false;
 
-    template<typename T, typename U, bool = IsPointer<T>
-        || IsSame<T, U> || detail::HasElement<T>::value
-    > constexpr bool SameOrLessCvQualified = SameOrLessCvQualifiedBase<T, U>;
+    template<typename T, typename U, bool =
+        IsPointer<T> || IsSame<T, U> || detail::HasElement<T>::value
+    >
+    constexpr bool SameOrLessCvQualified = SameOrLessCvQualifiedBase<T, U>;
 
     template<typename T, typename U>
     constexpr bool SameOrLessCvQualified<T, U, false> = false;
@@ -366,30 +397,39 @@ public:
     template<typename U> Box(U p, Conditional<
         IsReference<D>, D, AddLvalueReference<D const>
     > d, EnableIf<detail::SameOrLessCvQualified<U, Pointer>, Nat> = Nat()):
-        p_stor(p, d) {}
+        p_stor(p, d)
+    {}
 
     Box(Nullptr, Conditional<IsReference<D>, D, AddLvalueReference<D const>> d):
-        p_stor(nullptr, d) {}
+        p_stor(nullptr, d)
+    {}
 
     template<typename U> Box(U p, RemoveReference<D> &&d,
     EnableIf<detail::SameOrLessCvQualified<U, Pointer>, Nat> = Nat()):
-    p_stor(p, move(d)) {
+        p_stor(p, move(d))
+    {
         static_assert(!IsReference<D>, "rvalue deleter cannot be a ref");
     }
 
     Box(Nullptr, RemoveReference<D> &&d):
-    p_stor(nullptr, move(d)) {
+        p_stor(nullptr, move(d))
+    {
         static_assert(!IsReference<D>, "rvalue deleter cannot be a ref");
     }
 
     Box(Box &&u): p_stor(u.release(), forward<D>(u.get_deleter())) {}
 
     template<typename TT, typename DD>
-    Box(Box<TT, DD> &&u, EnableIf<IsArray<TT>
-        && detail::SameOrLessCvQualified<typename Box<TT, DD>::Pointer,
-                                         Pointer>
-        && IsConvertible<DD, D> && (!IsReference<D> || IsSame<D, DD>)> = Nat()
-    ): p_stor(u.release(), forward<DD>(u.get_deleter())) {}
+    Box(
+        Box<TT, DD> &&u, EnableIf<
+            IsArray<TT> &&
+            detail::SameOrLessCvQualified<typename Box<TT, DD>::Pointer,Pointer> &&
+            IsConvertible<DD, D> && (!IsReference<D> || IsSame<D, DD>),
+            Nat
+        > = Nat()
+    ):
+        p_stor(u.release(), forward<DD>(u.get_deleter()))
+    {}
 
     Box &operator=(Box &&u) {
         reset(u.release());
@@ -398,10 +438,10 @@ public:
     }
 
     template<typename TT, typename DD>
-    EnableIf<IsArray<TT>
-        && detail::SameOrLessCvQualified<typename Box<TT, DD>::Pointer,
-                                         Pointer>
-        && IsAssignable<D &, DD &&>,
+    EnableIf<
+        IsArray<TT> &&
+        detail::SameOrLessCvQualified<typename Box<TT, DD>::Pointer, Pointer> &&
+        IsAssignable<D &, DD &&>,
         Box &
     > operator=(Box<TT, DD> &&u) {
         reset(u.release());
@@ -435,18 +475,23 @@ public:
         return p;
     }
 
-    template<typename U> EnableIf<
+    template<typename U>
+    EnableIf<
         detail::SameOrLessCvQualified<U, Pointer>, void
     > reset(U p) {
         Pointer tmp = p_stor.first();
         p_stor.first() = p;
-        if (tmp) p_stor.second()(tmp);
+        if (tmp) {
+            p_stor.second()(tmp);
+        }
     }
 
     void reset(Nullptr) {
         Pointer tmp = p_stor.first();
         p_stor.first() = nullptr;
-        if (tmp) p_stor.second()(tmp);
+        if (tmp) {
+            p_stor.second()(tmp);
+        }
     }
 
     void reset() {
@@ -462,15 +507,18 @@ private:
 };
 
 namespace detail {
-    template<typename T> struct BoxIf {
+    template<typename T>
+    struct BoxIf {
         using BoxType = Box<T>;
     };
 
-    template<typename T> struct BoxIf<T[]> {
+    template<typename T>
+    struct BoxIf<T[]> {
         using BoxUnknownSize = Box<T[]>;
     };
 
-    template<typename T, Size N> struct BoxIf<T[N]> {
+    template<typename T, Size N>
+    struct BoxIf<T[N]> {
         using BoxKnownSize = void;
     };
 }
@@ -490,25 +538,31 @@ typename detail::BoxIf<T>::BoxKnownSize make_box(A &&...args) = delete;
 
 /* allocator */
 
-template<typename> struct Allocator;
+template<typename>
+struct Allocator;
 
-template<> struct Allocator<void> {
+template<>
+struct Allocator<void> {
     using Value = void;
     using Pointer = void *;
     using ConstPointer = void const *;
 
-    template<typename U> using Rebind = Allocator<U>;
+    template<typename U>
+    using Rebind = Allocator<U>;
 };
 
-template<> struct Allocator<void const> {
+template<>
+struct Allocator<void const> {
     using Value = void const;
     using Pointer = void const *;
     using ConstPointer = void const *;
 
-    template<typename U> using Rebind = Allocator<U>;
+    template<typename U>
+    using Rebind = Allocator<U>;
 };
 
-template<typename T> struct Allocator {
+template<typename T>
+struct Allocator {
     using Size = ostd::Size;
     using Difference = Ptrdiff;
     using Value = T;
@@ -517,10 +571,12 @@ template<typename T> struct Allocator {
     using Pointer = T *;
     using ConstPointer = T const *;
 
-    template<typename U> using Rebind = Allocator<U>;
+    template<typename U>
+    using Rebind = Allocator<U>;
 
     Allocator() {}
-    template<typename U> Allocator(Allocator<U> const &) {}
+    template<typename U>
+    Allocator(Allocator<U> const &) {}
 
     Pointer address(Reference v) const {
         return address_of(v);
@@ -545,7 +601,8 @@ template<typename T> struct Allocator {
     void destroy(Pointer p) { p->~T(); }
 };
 
-template<typename T> struct Allocator<T const> {
+template<typename T>
+struct Allocator<T const> {
     using Size = ostd::Size;
     using Difference = Ptrdiff;
     using Value = T const;
@@ -554,10 +611,12 @@ template<typename T> struct Allocator<T const> {
     using Pointer = T const *;
     using ConstPointer = T const *;
 
-    template<typename U> using Rebind = Allocator<U>;
+    template<typename U>
+    using Rebind = Allocator<U>;
 
     Allocator() {}
-    template<typename U> Allocator(Allocator<U> const &) {}
+    template<typename U>
+    Allocator(Allocator<U> const &) {}
 
     ConstPointer address(ConstReference v) const {
         return address_of(v);
@@ -594,14 +653,14 @@ bool operator!=(Allocator<T> const &, Allocator<U> const &) {
 namespace detail {
     template<typename T>
     struct ConstPtrTest {
-        template<typename U> static char test(
-            typename U::ConstPointer * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(typename U::ConstPointer * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
-    template<typename T, typename P, typename A,
-        bool = ConstPtrTest<A>::value>
+    template<typename T, typename P, typename A, bool = ConstPtrTest<A>::value>
     struct ConstPointer {
         using Type = typename A::ConstPointer;
     };
@@ -613,9 +672,10 @@ namespace detail {
 
     template<typename T>
     struct VoidPtrTest {
-        template<typename U> static char test(
-            typename U::VoidPointer * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(typename U::VoidPointer * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -649,8 +709,10 @@ namespace detail {
 
     template<typename T>
     struct SizeTest {
-        template<typename U> static char test(typename U::Size * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(typename U::Size * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -698,8 +760,10 @@ using AllocatorConstVoidPointer = typename detail::ConstVoidPointer<
 namespace detail {
     template<typename T>
     struct DiffTest {
-        template<typename U> static char test(typename U::Difference * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(typename U::Difference * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -734,14 +798,16 @@ namespace detail {
         using Type = typename T::template Rebind<U>;
     };
 
-    template<template<typename, typename...> class A, typename T,
+    template<
+        template<typename, typename...> class A, typename T,
         typename ...Args, typename U
     >
     struct AllocTraitsRebindType<A<T, Args...>, U, true> {
         using Type = typename A<T, Args...>::template Rebind<U>;
     };
 
-    template<template<typename, typename...> class A, typename T,
+    template<
+        template<typename, typename...> class A, typename T,
         typename ...Args, typename U
     >
     struct AllocTraitsRebindType<A<T, Args...>, U, false> {
@@ -759,57 +825,62 @@ using AllocatorRebind = typename detail::AllocTraitsRebindType<
 namespace detail {
     template<typename T>
     struct PropagateOnContainerCopyAssignmentTest {
-        template<typename U> static char test(
-            decltype(U::PropagateOnContainerCopyAssignment) * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(decltype(U::PropagateOnContainerCopyAssignment) * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
-    template<typename A, bool = PropagateOnContainerCopyAssignmentTest<
-        A
-    >::value> constexpr bool PropagateOnContainerCopyAssignmentBase = false;
+    template<typename A, bool =
+        PropagateOnContainerCopyAssignmentTest<A>::value
+    >
+    constexpr bool PropagateOnContainerCopyAssignmentBase = false;
 
     template<typename A>
-    constexpr bool PropagateOnContainerCopyAssignmentBase<A, true>
-        = A::PropagateOnContainerCopyAssignment;
+    constexpr bool PropagateOnContainerCopyAssignmentBase<A, true> =
+        A::PropagateOnContainerCopyAssignment;
 } /* namespace detail */
 
 template<typename A>
-constexpr bool AllocatorPropagateOnContainerCopyAssignment
-    = detail::PropagateOnContainerCopyAssignmentBase<A>;
+constexpr bool AllocatorPropagateOnContainerCopyAssignment =
+    detail::PropagateOnContainerCopyAssignmentBase<A>;
 
 /* allocator propagate on container move assignment */
 
 namespace detail {
     template<typename T>
     struct PropagateOnContainerMoveAssignmentTest {
-        template<typename U> static char test(
-            decltype(U::PropagateOnContainerMoveAssignment) * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(decltype(U::PropagateOnContainerMoveAssignment) * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
-    template<typename A, bool = PropagateOnContainerMoveAssignmentTest<
-        A
-    >::value> constexpr bool PropagateOnContainerMoveAssignmentBase = false;
+    template<typename A, bool =
+        PropagateOnContainerMoveAssignmentTest<A>::value
+    >
+    constexpr bool PropagateOnContainerMoveAssignmentBase = false;
 
     template<typename A>
-    constexpr bool PropagateOnContainerMoveAssignmentBase<A, true>
-        = A::PropagateOnContainerMoveAssignment;
+    constexpr bool PropagateOnContainerMoveAssignmentBase<A, true> =
+        A::PropagateOnContainerMoveAssignment;
 } /* namespace detail */
 
 template<typename A>
-constexpr bool AllocatorPropagateOnContainerMoveAssignment
-    = detail::PropagateOnContainerMoveAssignmentBase<A>;
+constexpr bool AllocatorPropagateOnContainerMoveAssignment =
+    detail::PropagateOnContainerMoveAssignmentBase<A>;
 
 /* allocator propagate on container swap */
 
 namespace detail {
     template<typename T>
     struct PropagateOnContainerSwapTest {
-        template<typename U> static char test(
-            decltype(U::PropagateOnContainerSwap) * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(decltype(U::PropagateOnContainerSwap) * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -817,21 +888,23 @@ namespace detail {
     constexpr bool PropagateOnContainerSwapBase = false;
 
     template<typename A>
-    constexpr bool PropagateOnContainerSwapBase<A, true>
-        = A::PropagateOnContainerSwap;
+    constexpr bool PropagateOnContainerSwapBase<A, true> =
+        A::PropagateOnContainerSwap;
 } /* namespace detail */
 
 template<typename A>
-constexpr bool AllocatorPropagateOnContainerSwap
-    = detail::PropagateOnContainerSwapBase<A>;
+constexpr bool AllocatorPropagateOnContainerSwap =
+    detail::PropagateOnContainerSwapBase<A>;
 
 /* allocator is always equal */
 
 namespace detail {
     template<typename T>
     struct IsAlwaysEqualTest {
-        template<typename U> static char test(decltype(U::IsAlwaysEqual) * = 0);
-        template<typename U> static  int test(...);
+        template<typename U>
+        static char test(decltype(U::IsAlwaysEqual) * = 0);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -848,56 +921,58 @@ constexpr bool AllocatorIsAlwaysEqual = detail::IsAlwaysEqualBase<A>;
 /* allocator allocate */
 
 template<typename A>
-inline AllocatorPointer<A>
-allocator_allocate(A &a, AllocatorSize<A> n) {
+inline AllocatorPointer<A> allocator_allocate(A &a, AllocatorSize<A> n) {
     return a.allocate(n);
 }
 
 namespace detail {
     template<typename A, typename S, typename CVP>
-    auto allocate_hint_test(A &&a, S &&sz, CVP &&p)
-        -> decltype(a.allocate(sz, p), True());
+    auto allocate_hint_test(A &&a, S &&sz, CVP &&p) ->
+        decltype(a.allocate(sz, p), True());
 
     template<typename A, typename S, typename CVP>
-    auto allocate_hint_test(A const &, S &&, CVP &&)
-        -> False;
+    auto allocate_hint_test(A const &, S &&, CVP &&) -> False;
 
     template<typename A, typename S, typename CVP>
-    constexpr bool AllocateHintTest
-        = IsSame<decltype(allocate_hint_test(declval<A>(),
-                                             declval<S>(),
-                                             declval<CVP>())), True
+    constexpr bool AllocateHintTest =
+        IsSame<
+            decltype(allocate_hint_test(
+                declval<A>(), declval<S>(), declval<CVP>()
+            )), True
         >;
 
     template<typename A>
-    inline AllocatorPointer<A> allocate(A &a, AllocatorSize<A> n,
-                                         AllocatorConstVoidPointer<A> h,
-                                         True) {
+    inline AllocatorPointer<A> allocate(
+        A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A> h, True
+    ) {
         return a.allocate(n, h);
     }
 
     template<typename A>
-    inline AllocatorPointer<A> allocate(A &a, AllocatorSize<A> n,
-                                         AllocatorConstVoidPointer<A>,
-                                         False) {
+    inline AllocatorPointer<A> allocate(
+        A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A>, False
+    ) {
         return a.allocate(n);
     }
 } /* namespace detail */
 
 template<typename A>
-inline AllocatorPointer<A>
-allocator_allocate(A &a, AllocatorSize<A> n,
-                   AllocatorConstVoidPointer<A> h) {
-    return detail::allocate(a, n, h, BoolConstant<detail::AllocateHintTest<
+inline AllocatorPointer<A> allocator_allocate(
+    A &a, AllocatorSize<A> n, AllocatorConstVoidPointer<A> h
+) {
+    return detail::allocate(
+        a, n, h, BoolConstant<detail::AllocateHintTest<
             A, AllocatorSize<A>, AllocatorConstVoidPointer<A>
-    >>());
+        >>()
+    );
 }
 
 /* allocator deallocate */
 
 template<typename A>
-inline void allocator_deallocate(A &a, AllocatorPointer<A> p,
-                                 AllocatorSize<A> n) {
+inline void allocator_deallocate(
+    A &a, AllocatorPointer<A> p, AllocatorSize<A> n
+) {
     a.deallocate(p, n);
 }
 
@@ -905,19 +980,18 @@ inline void allocator_deallocate(A &a, AllocatorPointer<A> p,
 
 namespace detail {
     template<typename A, typename T, typename ...Args>
-    auto construct_test(A &&a, T *p, Args &&...args)
-        -> decltype(a.construct(p, forward<Args>(args)...),
-            True());
+    auto construct_test(A &&a, T *p, Args &&...args) ->
+        decltype(a.construct(p, forward<Args>(args)...), True());
 
     template<typename A, typename T, typename ...Args>
-    auto construct_test(A const &, T *, Args &&...)
-        -> False;
+    auto construct_test(A const &, T *, Args &&...) -> False;
 
     template<typename A, typename T, typename ...Args>
-    constexpr bool ConstructTest
-        = IsSame<decltype(construct_test(declval<A>(),
-                                         declval<T>(),
-                                         declval<Args>()...)), True
+    constexpr bool ConstructTest =
+        IsSame<
+            decltype(construct_test(
+                declval<A>(), declval<T>(), declval<Args>()...
+            )), True
         >;
 
     template<typename A, typename T, typename ...Args>
@@ -933,8 +1007,10 @@ namespace detail {
 
 template<typename A, typename T, typename ...Args>
 inline void allocator_construct(A &a, T *p, Args &&...args) {
-    detail::construct(BoolConstant<detail::ConstructTest<A, T *, Args...>>(),
-                      a, p, forward<Args>(args)...);
+    detail::construct(
+        BoolConstant<detail::ConstructTest<A, T *, Args...>>(),
+        a, p, forward<Args>(args)...
+    );
 }
 
 /* allocator destroy */
@@ -947,8 +1023,8 @@ namespace detail {
     auto destroy_test(A const &, P &&) -> False;
 
     template<typename A, typename P>
-    constexpr bool DestroyTest
-        = IsSame<decltype(destroy_test(declval<A>(), declval<P>())), True>;
+    constexpr bool DestroyTest =
+        IsSame<decltype(destroy_test(declval<A>(), declval<P>())), True>;
 
     template<typename A, typename T>
     inline void destroy(True, A &a, T *p) {
@@ -976,8 +1052,8 @@ namespace detail {
     auto alloc_max_size_test(A const &) -> False;
 
     template<typename A>
-    constexpr bool AllocMaxSizeTest
-        = IsSame<decltype(alloc_max_size_test(declval<A &>())), True>;
+    constexpr bool AllocMaxSizeTest =
+        IsSame<decltype(alloc_max_size_test(declval<A &>())), True>;
 
     template<typename A>
     inline AllocatorSize<A> alloc_max_size(True, A const &a) {
@@ -992,9 +1068,9 @@ namespace detail {
 
 template<typename A>
 inline AllocatorSize<A> allocator_max_size(A const &a) {
-    return detail::alloc_max_size(BoolConstant<
-        detail::AllocMaxSizeTest<A const>
-    >(), a);
+    return detail::alloc_max_size(
+        BoolConstant<detail::AllocMaxSizeTest<A const>>(), a
+    );
 }
 
 /* allocator container copy */
@@ -1007,8 +1083,8 @@ namespace detail {
     auto alloc_copy_test(A const &) -> False;
 
     template<typename A>
-    constexpr bool AllocCopyTest
-        = IsSame<decltype(alloc_copy_test(declval<A &>())), True>;
+    constexpr bool AllocCopyTest =
+        IsSame<decltype(alloc_copy_test(declval<A &>())), True>;
 
     template<typename A>
     inline AllocatorType<A> alloc_container_copy(True, A const &a) {
@@ -1023,9 +1099,9 @@ namespace detail {
 
 template<typename A>
 inline AllocatorType<A> allocator_container_copy(A const &a) {
-    return detail::alloc_container_copy(BoolConstant<
-        detail::AllocCopyTest<A const>
-    >(), a);
+    return detail::alloc_container_copy(
+        BoolConstant<detail::AllocCopyTest<A const>>(), a
+    );
 }
 
 /* allocator arg */
@@ -1037,9 +1113,12 @@ constexpr AllocatorArg allocator_arg = AllocatorArg();
 /* uses allocator */
 
 namespace detail {
-    template<typename T> struct HasAllocatorType {
-        template<typename U> static char test(typename U::Allocator *);
-        template<typename U> static  int test(...);
+    template<typename T>
+    struct HasAllocatorType {
+        template<typename U>
+        static char test(typename U::Allocator *);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == 1);
     };
 
@@ -1067,8 +1146,8 @@ namespace detail {
 }
 
 template<typename T, typename A, typename ...Args>
-constexpr int UsesAllocatorConstructor
-    = detail::UsesAllocCtor<T, A, Args...>::value;
+constexpr int UsesAllocatorConstructor =
+    detail::UsesAllocCtor<T, A, Args...>::value;
 
 } /* namespace ostd */
 
diff --git a/ostd/platform.hh b/ostd/platform.hh
index d8b9616..7870d8a 100644
--- a/ostd/platform.hh
+++ b/ostd/platform.hh
@@ -136,7 +136,9 @@ inline uint32_t endian_swap32(uint32_t x) {
     return (x << 24) | (x >> 24) | ((x >> 8) & 0xFF00) | ((x << 8) & 0xFF0000);
 }
 inline uint64_t endian_swap64(uint64_t x) {
-    return endian_swap32(uint32_t(x >> 32)) | (uint64_t(endian_swap32(uint32_t(x))) << 32);
+    return endian_swap32(
+        uint32_t(x >> 32)) | (uint64_t(endian_swap32(uint32_t(x))) << 32
+    );
 }
 
 #endif
diff --git a/ostd/range.hh b/ostd/range.hh
index fb69f47..fb6cc79 100644
--- a/ostd/range.hh
+++ b/ostd/range.hh
@@ -25,14 +25,17 @@ struct RandomAccessRangeTag: BidirectionalRangeTag {};
 struct FiniteRandomAccessRangeTag: RandomAccessRangeTag {};
 struct ContiguousRangeTag: FiniteRandomAccessRangeTag {};
 
-template<typename T> struct RangeHalf;
+template<typename T>
+struct RangeHalf;
 
 #define OSTD_RANGE_TRAIT(Name) \
 namespace detail { \
     template<typename T> \
     struct Range##Name##Test { \
-        template<typename U> static char test(RemoveReference<typename U::Name> *); \
-        template<typename U> static  int test(...); \
+        template<typename U> \
+        static char test(RemoveReference<typename U::Name> *); \
+        template<typename U> \
+        static int test(...); \
         static constexpr bool value = (sizeof(test<T>(0)) == sizeof(char)); \
     }; \
     template<typename T, bool = Range##Name##Test<T>::value> \
@@ -54,24 +57,25 @@ OSTD_RANGE_TRAIT(Difference)
 #undef OSTD_RANGE_TRAIT
 
 namespace detail {
-    template<typename U> static char is_range_test(typename U::Category *,
-                                                   typename U::Size *,
-                                                   typename U::Difference *,
-                                                   typename U::Value *,
-                                                   RemoveReference<
-                                                       typename U::Reference
-                                                   > *);
-    template<typename U> static int is_range_test(...);
+    template<typename U>
+    static char is_range_test(
+        typename U::Category *, typename U::Size *,
+        typename U::Difference *, typename U::Value *,
+        RemoveReference<typename U::Reference> *
+    );
+    template<typename U>
+    static int is_range_test(...);
 
-    template<typename T> constexpr bool IsRangeTest
-        = (sizeof(is_range_test<T>(0, 0, 0, 0, 0)) == sizeof(char));
+    template<typename T> constexpr bool IsRangeTest =
+        (sizeof(is_range_test<T>(0, 0, 0, 0, 0)) == sizeof(char));
 }
 
 // is input range
 
 namespace detail {
-    template<typename T> constexpr bool IsInputRangeCore
-        = IsConvertible<RangeCategory<T>, InputRangeTag>;
+    template<typename T>
+    constexpr bool IsInputRangeCore =
+        IsConvertible<RangeCategory<T>, InputRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsInputRangeBase = false;
@@ -86,8 +90,9 @@ constexpr bool IsInputRange = detail::IsInputRangeBase<T>;
 // is forward range
 
 namespace detail {
-    template<typename T> constexpr bool IsForwardRangeCore
-        = IsConvertible<RangeCategory<T>, ForwardRangeTag>;
+    template<typename T>
+    constexpr bool IsForwardRangeCore =
+        IsConvertible<RangeCategory<T>, ForwardRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsForwardRangeBase = false;
@@ -102,8 +107,9 @@ constexpr bool IsForwardRange = detail::IsForwardRangeBase<T>;
 // is bidirectional range
 
 namespace detail {
-    template<typename T> constexpr bool IsBidirectionalRangeCore
-        = IsConvertible<RangeCategory<T>, BidirectionalRangeTag>;
+    template<typename T>
+    constexpr bool IsBidirectionalRangeCore =
+        IsConvertible<RangeCategory<T>, BidirectionalRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsBidirectionalRangeBase = false;
@@ -113,14 +119,15 @@ namespace detail {
         detail::IsBidirectionalRangeCore<T>;
 }
 
-template<typename T> constexpr bool IsBidirectionalRange
-    = detail::IsBidirectionalRangeBase<T>;
+template<typename T> constexpr bool IsBidirectionalRange =
+    detail::IsBidirectionalRangeBase<T>;
 
 // is random access range
 
 namespace detail {
-    template<typename T> constexpr bool IsRandomAccessRangeCore
-        = IsConvertible<RangeCategory<T>, RandomAccessRangeTag>;
+    template<typename T>
+    constexpr bool IsRandomAccessRangeCore =
+        IsConvertible<RangeCategory<T>, RandomAccessRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsRandomAccessRangeBase = false;
@@ -130,14 +137,15 @@ namespace detail {
         detail::IsRandomAccessRangeCore<T>;
 }
 
-template<typename T> constexpr bool IsRandomAccessRange
-    = detail::IsRandomAccessRangeBase<T>;
+template<typename T> constexpr bool IsRandomAccessRange =
+    detail::IsRandomAccessRangeBase<T>;
 
 // is finite random access range
 
 namespace detail {
-    template<typename T> constexpr bool IsFiniteRandomAccessRangeCore
-        = IsConvertible<RangeCategory<T>, FiniteRandomAccessRangeTag>;
+    template<typename T>
+    constexpr bool IsFiniteRandomAccessRangeCore =
+        IsConvertible<RangeCategory<T>, FiniteRandomAccessRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsFiniteRandomAccessRangeBase = false;
@@ -147,19 +155,20 @@ namespace detail {
         detail::IsFiniteRandomAccessRangeCore<T>;
 }
 
-template<typename T> constexpr bool IsFiniteRandomAccessRange
-    = detail::IsFiniteRandomAccessRangeBase<T>;
+template<typename T> constexpr bool IsFiniteRandomAccessRange =
+    detail::IsFiniteRandomAccessRangeBase<T>;
 
 // is infinite random access range
 
-template<typename T> constexpr bool IsInfiniteRandomAccessRange
-    = IsRandomAccessRange<T> && !IsFiniteRandomAccessRange<T>;
+template<typename T> constexpr bool IsInfiniteRandomAccessRange =
+    IsRandomAccessRange<T> && !IsFiniteRandomAccessRange<T>;
 
 // is contiguous range
 
 namespace detail {
-    template<typename T> constexpr bool IsContiguousRangeCore
-        = IsConvertible<RangeCategory<T>, ContiguousRangeTag>;
+    template<typename T>
+    constexpr bool IsContiguousRangeCore =
+        IsConvertible<RangeCategory<T>, ContiguousRangeTag>;
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsContiguousRangeBase = false;
@@ -169,26 +178,32 @@ namespace detail {
         detail::IsContiguousRangeCore<T>;
 }
 
-template<typename T> constexpr bool IsContiguousRange
-    = detail::IsContiguousRangeBase<T>;
+template<typename T> constexpr bool IsContiguousRange =
+    detail::IsContiguousRangeBase<T>;
 
 // is output range
 
 namespace detail {
     template<typename T, typename P>
     struct OutputRangeTest {
-        template<typename U, bool (U::*)(P)> struct Test {};
-        template<typename U> static char test(Test<U, &U::put> *);
-        template<typename U> static  int test(...);
+        template<typename U, bool (U::*)(P)>
+        struct Test {};
+        template<typename U>
+        static char test(Test<U, &U::put> *);
+        template<typename U>
+        static int test(...);
         static constexpr bool value = (sizeof(test<T>(0)) == sizeof(char));
     };
 
-    template<typename T> constexpr bool IsOutputRangeCore
-        = IsConvertible<RangeCategory<T>, OutputRangeTag> ||
-          (IsInputRange<T> &&
-              (detail::OutputRangeTest<T, RangeValue<T> const &>::value ||
-               detail::OutputRangeTest<T, RangeValue<T>      &&>::value ||
-               detail::OutputRangeTest<T, RangeValue<T>        >::value));
+    template<typename T>
+    constexpr bool IsOutputRangeCore =
+        IsConvertible<RangeCategory<T>, OutputRangeTag> || (
+            IsInputRange<T> && (
+                detail::OutputRangeTest<T, RangeValue<T> const &>::value ||
+                detail::OutputRangeTest<T, RangeValue<T>      &&>::value ||
+                detail::OutputRangeTest<T, RangeValue<T>        >::value
+            )
+        );
 
     template<typename T, bool = detail::IsRangeTest<T>>
     constexpr bool IsOutputRangeBase = false;
@@ -204,13 +219,33 @@ namespace detail {
 
     template<typename T>
     struct RangeIterator {
-        RangeIterator(): p_range() {}
-        explicit RangeIterator(T const &range) {
+        RangeIterator(): p_range(), p_init(false) {}
+        explicit RangeIterator(T const &range): p_range(), p_init(true) {
             ::new(&get_ref()) T(range);
         }
-        explicit RangeIterator(T &&range) {
+        explicit RangeIterator(T &&range): p_range(), p_init(true) {
             ::new(&get_ref()) T(move(range));
         }
+        RangeIterator(const RangeIterator &v): p_range(), p_init(true) {
+            ::new(&get_ref()) T(v.get_ref());
+        }
+        RangeIterator(RangeIterator &&v): p_range(), p_init(true) {
+            ::new(&get_ref()) T(move(v.get_ref()));
+        }
+        RangeIterator &operator=(const RangeIterator &v) {
+            destroy();
+            ::new(&get_ref()) T(v.get_ref());
+            p_init = true;
+            return *this;
+        }
+        RangeIterator &operator=(RangeIterator &&v) {
+            destroy();
+            swap(v);
+            return *this;
+        }
+        ~RangeIterator() {
+            destroy();
+        }
         RangeIterator &operator++() {
             get_ref().pop_front();
             return *this;
@@ -219,16 +254,28 @@ namespace detail {
             return get_ref().front();
         }
         bool operator!=(RangeIterator) const { return !get_ref().empty(); }
+        void swap(RangeIterator &v) {
+            detail::swap_adl(get_ref(). v.get_ref());
+            detail::swap_adl(p_init, v.p_init);
+        }
     private:
         T &get_ref() { return *reinterpret_cast<T *>(&p_range); }
         T const &get_ref() const { return *reinterpret_cast<T const *>(&p_range); }
+        void destroy() {
+            if (p_init) {
+                get_ref().~T();
+                p_init = false;
+            }
+        }
         AlignedStorage<sizeof(T), alignof(T)> p_range;
+        bool p_init;
     };
 }
 
 // range half
 
-template<typename T> struct HalfRange;
+template<typename T>
+struct HalfRange;
 
 namespace detail {
     template<typename R, bool = IsBidirectionalRange<typename R::Range>>
@@ -239,11 +286,15 @@ namespace detail {
         using Diff = RangeDifference<typename R::Range>;
 
         static Diff add_n(R &half, Diff n) {
-            if (n < 0) return -half.prev_n(n);
+            if (n < 0) {
+                return -half.prev_n(n);
+            }
             return half.next_n(n);
         }
         static Diff sub_n(R &half, Diff n) {
-            if (n < 0) return -half.next_n(n);
+            if (n < 0) {
+                return -half.next_n(n);
+            }
             return half.prev_n(n);
         }
     };
@@ -253,11 +304,15 @@ namespace detail {
         using Diff = RangeDifference<typename R::Range>;
 
         static Diff add_n(R &half, Diff n) {
-            if (n < 0) return 0;
+            if (n < 0) {
+                return 0;
+            }
             return half.next_n(n);
         }
         static Diff sub_n(R &half, Diff n) {
-            if (n < 0) return 0;
+            if (n < 0) {
+                return 0;
+            }
             return half.prev_n(n);
         }
     };
@@ -393,44 +448,65 @@ inline RangeDifference<R> operator-(R const &lhs, R const &rhs) {
 namespace detail {
     template<typename R>
     RangeSize<R> pop_front_n(R &range, RangeSize<R> n) {
-        for (RangeSize<R> i = 0; i < n; ++i)
-            if (!range.pop_front()) return i;
+        for (RangeSize<R> i = 0; i < n; ++i) {
+            if (!range.pop_front()) {
+                return i;
+            }
+        }
         return n;
     }
 
     template<typename R>
     RangeSize<R> pop_back_n(R &range, RangeSize<R> n) {
-        for (RangeSize<R> i = 0; i < n; ++i)
-            if (!range.pop_back()) return i;
+        for (RangeSize<R> i = 0; i < n; ++i) {
+            if (!range.pop_back()) {
+                return i;
+            }
+        }
         return n;
     }
 
     template<typename R>
     RangeSize<R> push_front_n(R &range, RangeSize<R> n) {
-        for (RangeSize<R> i = 0; i < n; ++i)
-            if (!range.push_front()) return i;
+        for (RangeSize<R> i = 0; i < n; ++i) {
+            if (!range.push_front()) {
+                return i;
+            }
+        }
         return n;
     }
 
     template<typename R>
     RangeSize<R> push_back_n(R &range, RangeSize<R> n) {
-        for (RangeSize<R> i = 0; i < n; ++i)
-            if (!range.push_back()) return i;
+        for (RangeSize<R> i = 0; i < n; ++i) {
+            if (!range.push_back()) {
+                return i;
+            }
+        }
         return n;
     }
 }
 
-template<typename> struct ReverseRange;
-template<typename> struct MoveRange;
-template<typename> struct EnumeratedRange;
-template<typename> struct TakeRange;
-template<typename> struct ChunksRange;
-template<typename ...> struct JoinRange;
-template<typename ...> struct ZipRange;
+template<typename>
+struct ReverseRange;
+template<typename>
+struct MoveRange;
+template<typename>
+struct EnumeratedRange;
+template<typename>
+struct TakeRange;
+template<typename>
+struct ChunksRange;
+template<typename ...>
+struct JoinRange;
+template<typename ...>
+struct ZipRange;
 
-template<typename B, typename C, typename V, typename R = V &,
-         typename S = Size, typename D = Ptrdiff
-> struct InputRange {
+template<
+    typename B, typename C, typename V, typename R = V &,
+    typename S = Size, typename D = Ptrdiff
+>
+struct InputRange {
     using Category = C;
     using Size = S;
     using Difference = D;
@@ -510,8 +586,9 @@ template<typename B, typename C, typename V, typename R = V &,
         B r(*static_cast<B const *>(this));
         Size on = n;
         for (; n && !r.empty(); --n) {
-            if (!orange.put(r.front()))
+            if (!orange.put(r.front())) {
                 break;
+            }
             r.pop_front();
         }
         return (on - n);
@@ -629,11 +706,14 @@ inline auto join(R &&range) {
 
 template<typename R1, typename ...R>
 inline auto join(R1 &&r1, R &&...rr) {
-    return [ranges = forward_as_tuple(forward<R1>(r1), forward<R>(rr)...)]
-           (auto &&obj) mutable {
+    return [
+        ranges = forward_as_tuple(forward<R1>(r1), forward<R>(rr)...)
+    ] (auto &&obj) mutable {
         using Index = detail::MakeTupleIndices<sizeof...(R) + 1>;
-        return detail::join_proxy(forward<decltype(obj   )>(obj),
-                                  forward<decltype(ranges)>(ranges), Index());
+        return detail::join_proxy(
+            forward<decltype(obj)>(obj),
+            forward<decltype(ranges)>(ranges), Index()
+        );
     };
 }
 
@@ -646,11 +726,14 @@ inline auto zip(R &&range) {
 
 template<typename R1, typename ...R>
 inline auto zip(R1 &&r1, R &&...rr) {
-    return [ranges = forward_as_tuple(forward<R1>(r1), forward<R>(rr)...)]
-           (auto &&obj) mutable {
+    return [
+        ranges = forward_as_tuple(forward<R1>(r1), forward<R>(rr)...)
+    ] (auto &&obj) mutable {
         using Index = detail::MakeTupleIndices<sizeof...(R) + 1>;
-        return detail::zip_proxy(forward<decltype(obj   )>(obj),
-                                 forward<decltype(ranges)>(ranges), Index());
+        return detail::zip_proxy(
+            forward<decltype(obj)>(obj),
+            forward<decltype(ranges)>(ranges), Index()
+        );
     };
 }
 
@@ -669,9 +752,11 @@ inline auto citer(T const &r) -> decltype(r.iter()) {
     return r.iter();
 }
 
-template<typename B, typename V, typename R = V &,
-         typename S = Size, typename D = Ptrdiff
-> struct OutputRange {
+template<
+    typename B, typename V, typename R = V &,
+    typename S = Size, typename D = Ptrdiff
+>
+struct OutputRange {
     using Category = OutputRangeTag;
     using Size = S;
     using Difference = D;
@@ -700,14 +785,18 @@ private:
     T p_end;
 public:
     HalfRange() = delete;
-    HalfRange(HalfRange const &range): p_beg(range.p_beg),
-        p_end(range.p_end) {}
-    HalfRange(HalfRange &&range): p_beg(move(range.p_beg)),
-        p_end(move(range.p_end)) {}
-    HalfRange(T const &beg, T const &end): p_beg(beg),
-        p_end(end) {}
-    HalfRange(T &&beg, T &&end): p_beg(move(beg)),
-        p_end(move(end)) {}
+    HalfRange(HalfRange const &range):
+        p_beg(range.p_beg), p_end(range.p_end)
+    {}
+    HalfRange(HalfRange &&range):
+        p_beg(move(range.p_beg)), p_end(move(range.p_end))
+    {}
+    HalfRange(T const &beg, T const &end):
+        p_beg(beg),p_end(end)
+    {}
+    HalfRange(T &&beg, T &&end):
+        p_beg(move(beg)), p_end(move(end))
+    {}
 
     HalfRange &operator=(HalfRange const &range) {
         p_beg = range.p_beg;
@@ -724,14 +813,18 @@ public:
     bool empty() const { return p_beg == p_end; }
 
     bool pop_front() {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         return p_beg.next();
     }
     bool push_front() {
         return p_beg.prev();
     }
     bool pop_back() {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         return p_end.prev();
     }
     bool push_back() {
@@ -757,8 +850,7 @@ public:
 
     RangeSize<Rtype> size() const { return p_end - p_beg; }
 
-    HalfRange<Rtype>
-    slice(RangeSize<Rtype> start, RangeSize<Rtype> end) const {
+    HalfRange<Rtype> slice(RangeSize<Rtype> start, RangeSize<Rtype> end) const {
         return HalfRange<Rtype>(p_beg + start, p_beg + end);
     }
 
@@ -815,7 +907,7 @@ public:
     Rsize size() const { return p_range.size(); }
 
     bool equals_front(ReverseRange const &r) const {
-    return p_range.equals_back(r.p_range);
+        return p_range.equals_back(r.p_range);
     }
     bool equals_back(ReverseRange const &r) const {
         return p_range.equals_front(r.p_range);
@@ -931,10 +1023,12 @@ public:
 template<typename T>
 struct NumberRange: InputRange<NumberRange<T>, ForwardRangeTag, T, T> {
     NumberRange() = delete;
-    NumberRange(NumberRange const &it): p_a(it.p_a), p_b(it.p_b),
-        p_step(it.p_step) {}
-    NumberRange(T a, T b, T step = T(1)): p_a(a), p_b(b),
-        p_step(step) {}
+    NumberRange(NumberRange const &it):
+        p_a(it.p_a), p_b(it.p_b), p_step(it.p_step)
+    {}
+    NumberRange(T a, T b, T step = T(1)):
+        p_a(a), p_b(b), p_step(step)
+    {}
     NumberRange(T v): p_a(0), p_b(v), p_step(1) {}
 
     bool empty() const { return p_a * p_step >= p_b * p_step; }
@@ -988,7 +1082,9 @@ public:
     bool empty() const { return p_beg == p_end; }
 
     bool pop_front() {
-        if (p_beg == p_end) return false;
+        if (p_beg == p_end) {
+            return false;
+        }
         ++p_beg;
         return true;
     }
@@ -1022,7 +1118,9 @@ public:
 
     /* satisfy BidirectionalRange */
     bool pop_back() {
-        if (p_end == p_beg) return false;
+        if (p_end == p_beg) {
+            return false;
+        }
         --p_end;
         return true;
     }
@@ -1065,39 +1163,50 @@ public:
 
     /* satisfy OutputRange */
     bool put(T const &v) {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         *(p_beg++) = v;
         return true;
     }
     bool put(T &&v) {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         *(p_beg++) = move(v);
         return true;
     }
 
     Size put_n(T const *p, Size n) {
         Size ret = size();
-        if (n < ret) ret = n;
+        if (n < ret) {
+            ret = n;
+        }
         if (IsPod<T>) {
             memcpy(p_beg, p, ret * sizeof(T));
             p_beg += ret;
             return ret;
         }
-        for (Size i = ret; i; --i)
+        for (Size i = ret; i; --i) {
             *p_beg++ = *p++;
+        }
         return ret;
     }
 
     template<typename R>
     EnableIf<IsOutputRange<R>, Size> copy(R &&orange, Size n = -1) {
         Size c = size();
-        if (n < c) c = n;
+        if (n < c) {
+            c = n;
+        }
         return orange.put_n(p_beg, c);
     }
 
     Size copy(RemoveCv<T> *p, Size n = -1) {
         Size c = size();
-        if (n < c) c = n;
+        if (n < c) {
+            c = n;
+        }
         if (IsPod<T>) {
             memcpy(p_beg, data(), c * sizeof(T));
             return c;
@@ -1163,10 +1272,12 @@ public:
     EnumeratedRange(T const &range): p_range(range), p_index(0) {}
 
     EnumeratedRange(EnumeratedRange const &it):
-        p_range(it.p_range), p_index(it.p_index) {}
+        p_range(it.p_range), p_index(it.p_index)
+    {}
 
     EnumeratedRange(EnumeratedRange &&it):
-        p_range(move(it.p_range)), p_index(it.p_index) {}
+        p_range(move(it.p_range)), p_index(it.p_index)
+    {}
 
     EnumeratedRange &operator=(EnumeratedRange const &v) {
         p_range = v.p_range;
@@ -1224,12 +1335,15 @@ private:
     RangeSize<T> p_remaining;
 public:
     TakeRange() = delete;
-    TakeRange(T const &range, RangeSize<T> rem): p_range(range),
-        p_remaining(rem) {}
-    TakeRange(TakeRange const &it): p_range(it.p_range),
-        p_remaining(it.p_remaining) {}
-    TakeRange(TakeRange &&it): p_range(move(it.p_range)),
-        p_remaining(it.p_remaining) {}
+    TakeRange(T const &range, RangeSize<T> rem):
+        p_range(range), p_remaining(rem)
+    {}
+    TakeRange(TakeRange const &it):
+        p_range(it.p_range), p_remaining(it.p_remaining)
+    {}
+    TakeRange(TakeRange &&it):
+        p_range(move(it.p_range)), p_remaining(it.p_remaining)
+    {}
 
     TakeRange &operator=(TakeRange const &v) {
         p_range = v.p_range; p_remaining = v.p_remaining; return *this;
@@ -1273,12 +1387,15 @@ private:
     RangeSize<T> p_chunksize;
 public:
     ChunksRange() = delete;
-    ChunksRange(T const &range, RangeSize<T> chs): p_range(range),
-        p_chunksize(chs) {}
-    ChunksRange(ChunksRange const &it): p_range(it.p_range),
-        p_chunksize(it.p_chunksize) {}
-    ChunksRange(ChunksRange &&it): p_range(move(it.p_range)),
-        p_chunksize(it.p_chunksize) {}
+    ChunksRange(T const &range, RangeSize<T> chs):
+        p_range(range), p_chunksize(chs)
+    {}
+    ChunksRange(ChunksRange const &it):
+        p_range(it.p_range), p_chunksize(it.p_chunksize)
+    {}
+    ChunksRange(ChunksRange &&it):
+        p_range(move(it.p_range)), p_chunksize(it.p_chunksize)
+    {}
 
     ChunksRange &operator=(ChunksRange const &v) {
         p_range = v.p_range; p_chunksize = v.p_chunksize; return *this;
@@ -1308,8 +1425,9 @@ namespace detail {
     struct JoinRangeEmpty {
         template<typename T>
         static bool empty(T const &tup) {
-            if (!ostd::get<I>(tup).empty())
+            if (!ostd::get<I>(tup).empty()) {
                 return false;
+            }
             return JoinRangeEmpty<I + 1, N>::empty(tup);
         }
     };
@@ -1326,8 +1444,9 @@ namespace detail {
     struct TupleRangeEqual {
         template<typename T>
         static bool equal(T const &tup1, T const &tup2) {
-            if (!ostd::get<I>(tup1).equals_front(ostd::get<I>(tup2)))
+            if (!ostd::get<I>(tup1).equals_front(ostd::get<I>(tup2))) {
                 return false;
+            }
             return TupleRangeEqual<I + 1, N>::equal(tup1, tup2);
         }
     };
@@ -1408,8 +1527,9 @@ public:
     }
 
     bool equals_front(JoinRange const &r) const {
-        return detail::TupleRangeEqual<0, sizeof...(R)>::equal(p_ranges,
-            r.p_ranges);
+        return detail::TupleRangeEqual<0, sizeof...(R)>::equal(
+            p_ranges, r.p_ranges
+        );
     }
 
     bool pop_front() {
@@ -1417,8 +1537,9 @@ public:
     }
 
     CommonType<RangeReference<R>...> front() const {
-        return detail::JoinRangeFront<0, sizeof...(R),
-            CommonType<RangeReference<R>...>>::front(p_ranges);
+        return detail::JoinRangeFront<
+            0, sizeof...(R), CommonType<RangeReference<R>...>
+        >::front(p_ranges);
     }
 };
 
@@ -1440,8 +1561,9 @@ namespace detail {
     struct ZipRangeEmpty {
         template<typename T>
         static bool empty(T const &tup) {
-            if (ostd::get<I>(tup).empty())
+            if (ostd::get<I>(tup).empty()) {
                 return true;
+            }
             return ZipRangeEmpty<I + 1, N>::empty(tup);
         }
     };
@@ -1458,8 +1580,9 @@ namespace detail {
     struct ZipRangePop {
         template<typename T>
         static bool pop(T &tup) {
-            return ostd::get<I>(tup).pop_front() &&
-                   ZipRangePop<I + 1, N>::pop(tup);
+            return (
+                ostd::get<I>(tup).pop_front() && ZipRangePop<I + 1, N>::pop(tup)
+            );
         }
     };
 
@@ -1516,8 +1639,9 @@ public:
     }
 
     bool equals_front(ZipRange const &r) const {
-        return detail::TupleRangeEqual<0, sizeof...(R)>::equal(p_ranges,
-            r.p_ranges);
+        return detail::TupleRangeEqual<0, sizeof...(R)>::equal(
+            p_ranges, r.p_ranges
+        );
     }
 
     bool pop_front() {
diff --git a/ostd/set.hh b/ostd/set.hh
index 55f74f1..b91b074 100644
--- a/ostd/set.hh
+++ b/ostd/set.hh
@@ -17,7 +17,8 @@
 namespace ostd {
 
 namespace detail {
-    template<typename T, typename A> struct SetBase {
+    template<typename T, typename A>
+    struct SetBase {
         static inline T const &get_key(T const &e) {
             return e;
         }
@@ -54,20 +55,26 @@ namespace detail {
         using ConstLocalRange = BucketRange<T const>;
         using Allocator = A;
 
-        explicit SetImpl(Size size, H const &hf = H(),
+        explicit SetImpl(
+            Size size, H const &hf = H(),
             C const &eqf = C(), A const &alloc = A()
-        ): Base(size, hf, eqf, alloc) {}
+        ):
+            Base(size, hf, eqf, alloc)
+        {}
 
         SetImpl(): SetImpl(0) {}
         explicit SetImpl(A const &alloc): SetImpl(0, H(), C(), alloc) {}
 
         SetImpl(Size size, A const &alloc):
-            SetImpl(size, H(), C(), alloc) {}
+            SetImpl(size, H(), C(), alloc)
+        {}
         SetImpl(Size size, H const &hf, A const &alloc):
-            SetImpl(size, hf, C(), alloc) {}
+            SetImpl(size, hf, C(), alloc)
+        {}
 
-        SetImpl(SetImpl const &m): Base(m,
-            allocator_container_copy(m.get_alloc())) {}
+        SetImpl(SetImpl const &m):
+            Base(m, allocator_container_copy(m.get_alloc()))
+        {}
 
         SetImpl(SetImpl const &m, A const &alloc): Base(m, alloc) {}
 
@@ -76,33 +83,45 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> SetImpl(R range, Size size = 0, H const &hf = H(),
+        >>
+        SetImpl(
+            R range, Size size = 0, H const &hf = H(),
             C const &eqf = C(), A const &alloc = A()
-        ): Base(size ? size : detail::estimate_hrsize(range),
-                   hf, eqf, alloc) {
-            for (; !range.empty(); range.pop_front())
+        ):
+            Base(size ? size : detail::estimate_hrsize(range), hf, eqf, alloc)
+        {
+            for (; !range.empty(); range.pop_front()) {
                 Base::emplace(range.front());
+            }
             Base::rehash_up();
         }
 
         template<typename R>
-        SetImpl(R range, Size size, A const &alloc)
-        : SetImpl(range, size, H(), C(), alloc) {}
+        SetImpl(R range, Size size, A const &alloc):
+            SetImpl(range, size, H(), C(), alloc)
+        {}
 
         template<typename R>
-        SetImpl(R range, Size size, H const &hf, A const &alloc)
-        : SetImpl(range, size, hf, C(), alloc) {}
+        SetImpl(R range, Size size, H const &hf, A const &alloc):
+            SetImpl(range, size, hf, C(), alloc)
+        {}
 
-        SetImpl(InitializerList<Value> init, Size size = 0,
+        SetImpl(
+            InitializerList<Value> init, Size size = 0,
             H const &hf = H(), C const &eqf = C(), A const &alloc = A()
-        ): SetImpl(iter(init), size, hf, eqf, alloc) {}
+        ):
+            SetImpl(iter(init), size, hf, eqf, alloc)
+        {}
 
-        SetImpl(InitializerList<Value> init, Size size, A const &alloc)
-        : SetImpl(iter(init), size, H(), C(), alloc) {}
+        SetImpl(InitializerList<Value> init, Size size, A const &alloc):
+            SetImpl(iter(init), size, H(), C(), alloc)
+        {}
 
-        SetImpl(InitializerList<Value> init, Size size, H const &hf,
-            A const &alloc
-        ): SetImpl(iter(init), size, hf, C(), alloc) {}
+        SetImpl(
+            InitializerList<Value> init, Size size, H const &hf, A const &alloc
+        ):
+            SetImpl(iter(init), size, hf, C(), alloc)
+        {}
 
         SetImpl &operator=(SetImpl const &m) {
             Base::operator=(m);
@@ -116,7 +135,8 @@ namespace detail {
 
         template<typename R, typename = EnableIf<
             IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-        >> SetImpl &operator=(R range) {
+        >>
+        SetImpl &operator=(R range) {
             Base::assign_range(range);
             return *this;
         }
@@ -137,14 +157,16 @@ template<
     typename H = ToHash<T>,
     typename C = EqualWithCstr<T>,
     typename A = Allocator<T>
-> using Set = detail::SetImpl<T, H, C, A, false>;
+>
+using Set = detail::SetImpl<T, H, C, A, false>;
 
 template<
     typename T,
     typename H = ToHash<T>,
     typename C = EqualWithCstr<T>,
     typename A = Allocator<T>
-> using Multiset = detail::SetImpl<T, H, C, A, true>;
+>
+using Multiset = detail::SetImpl<T, H, C, A, true>;
 
 } /* namespace ostd */
 
diff --git a/ostd/stream.hh b/ostd/stream.hh
index 5f73f7e..556313c 100644
--- a/ostd/stream.hh
+++ b/ostd/stream.hh
@@ -68,9 +68,11 @@ private:
     }
 
     template<typename T>
-    inline bool write_impl(T const &v, EnableIf<
-        !IsConstructible<ConstCharRange, T const &>, StNat
-    > = StNat()) {
+    inline bool write_impl(
+        T const &v, EnableIf<
+            !IsConstructible<ConstCharRange, T const &>, StNat
+        > = StNat()
+    ) {
         return write(ostd::to_string(v));
     }
 
@@ -85,7 +87,9 @@ public:
 
     virtual Offset size() {
         Offset p = tell();
-        if ((p < 0) || !seek(0, StreamSeek::end)) return -1;
+        if ((p < 0) || !seek(0, StreamSeek::end)) {
+            return -1;
+        }
         Offset e = tell();
         return ((p == e) || seek(p, StreamSeek::set)) ? e : -1;
     }
@@ -134,12 +138,14 @@ public:
     template<typename ...A>
     bool writef(ConstCharRange fmt, A const &...args) {
         char buf[512];
-        Ptrdiff need = format(detail::FormatOutRange<sizeof(buf)>(buf),
-            fmt, args...);
-        if (need < 0)
+        Ptrdiff need = format(
+            detail::FormatOutRange<sizeof(buf)>(buf), fmt, args...
+        );
+        if (need < 0) {
             return false;
-        else if (Size(need) < sizeof(buf))
+        } else if (Size(need) < sizeof(buf)) {
             return write_bytes(buf, need) == Size(need);
+        }
         Vector<char> s;
         s.reserve(need);
         format(detail::UnsafeWritefRange(s.data()), fmt, args...);
@@ -154,23 +160,28 @@ public:
     template<typename T = char>
     StreamRange<T> iter();
 
-    template<typename T> Size put(T const *v, Size count) {
+    template<typename T>
+    Size put(T const *v, Size count) {
         return write_bytes(v, count * sizeof(T)) / sizeof(T);
     }
 
-    template<typename T> bool put(T v) {
+    template<typename T>
+    bool put(T v) {
         return write_bytes(&v, sizeof(T)) == sizeof(T);
     }
 
-    template<typename T> Size get(T *v, Size count) {
+    template<typename T>
+    Size get(T *v, Size count) {
         return read_bytes(v, count * sizeof(T)) / sizeof(T);
     }
 
-    template<typename T> bool get(T &v) {
+    template<typename T>
+    bool get(T &v) {
         return read_bytes(&v, sizeof(T)) == sizeof(T);
     }
 
-    template<typename T> T get() {
+    template<typename T>
+    T get() {
         T r;
         return get(r) ? r : T();
     }
@@ -189,7 +200,9 @@ struct StreamRange<T, true>: InputRange<
     }
 
     bool pop_front() {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         T val;
         return !!p_stream->read_bytes(&val, sizeof(T));
     }
diff --git a/ostd/string.hh b/ostd/string.hh
index 993873e..0397fc7 100644
--- a/ostd/string.hh
+++ b/ostd/string.hh
@@ -18,7 +18,8 @@
 namespace ostd {
 static constexpr Size npos = -1;
 
-template<typename T, typename A = Allocator<T>> class StringBase;
+template<typename T, typename A = Allocator<T>>
+class StringBase;
 
 template<typename T>
 struct CharRangeBase: InputRange<
@@ -39,25 +40,28 @@ public:
 
     /* TODO: traits for utf-16/utf-32 string lengths, for now assume char */
     template<typename U>
-    CharRangeBase(U beg, EnableIf<IsConvertible<U, T *> && !IsArray<U>, Nat>
-        = Nat()): p_beg(beg), p_end(static_cast<T *>(beg)
-                                     + (beg ? strlen(beg) : 0)) {}
+    CharRangeBase(
+        U beg, EnableIf<IsConvertible<U, T *> && !IsArray<U>, Nat> = Nat()
+    ): p_beg(beg), p_end(static_cast<T *>(beg) + (beg ? strlen(beg) : 0)) {}
 
     CharRangeBase(Nullptr): p_beg(nullptr), p_end(nullptr) {}
 
     template<typename U, Size N>
     CharRangeBase(U (&beg)[N], EnableIf<IsConvertible<U *, T *>, Nat> = Nat()):
-        p_beg(beg), p_end(beg + N - (beg[N - 1] == '\0')) {}
+        p_beg(beg), p_end(beg + N - (beg[N - 1] == '\0'))
+    {}
 
     template<typename U, typename A>
     CharRangeBase(StringBase<U, A> const &s, EnableIf<
         IsConvertible<U *, T *>, Nat
-    > = Nat()): p_beg(s.data()),
-        p_end(s.data() + s.size()) {}
+    > = Nat()):
+        p_beg(s.data()), p_end(s.data() + s.size())
+    {}
 
     template<typename U, typename = EnableIf<IsConvertible<U *, T *>>>
     CharRangeBase(CharRangeBase<U> const &v):
-        p_beg(&v[0]), p_end(&v[v.size()]) {}
+        p_beg(&v[0]), p_end(&v[v.size()])
+    {}
 
     CharRangeBase &operator=(CharRangeBase const &v) {
         p_beg = v.p_beg; p_end = v.p_end; return *this;
@@ -75,7 +79,9 @@ public:
     bool empty() const { return p_beg == p_end; }
 
     bool pop_front() {
-        if (p_beg == p_end) return false;
+        if (p_beg == p_end) {
+            return false;
+        }
         ++p_beg;
         return true;
     }
@@ -104,7 +110,9 @@ public:
     }
 
     bool pop_back() {
-        if (p_end == p_beg) return false;
+        if (p_end == p_beg) {
+            return false;
+        }
         --p_end;
         return true;
     }
@@ -141,7 +149,9 @@ public:
     T &operator[](Size i) const { return p_beg[i]; }
 
     bool put(T v) {
-        if (empty()) return false;
+        if (empty()) {
+            return false;
+        }
         *(p_beg++) = v;
         return true;
     }
@@ -209,8 +219,9 @@ inline bool operator>=(ConstCharRange lhs, ConstCharRange rhs) {
 }
 
 inline bool starts_with(ConstCharRange a, ConstCharRange b) {
-    if (a.size() < b.size())
+    if (a.size() < b.size()) {
         return false;
+    }
     return a.slice(0, b.size()) == b;
 }
 
@@ -225,7 +236,9 @@ class StringBase {
     void ctor_from_range(R &range, EnableIf<
         IsFiniteRandomAccessRange<R> && IsSame<T, RemoveCv<RangeValue<R>>>, bool
     > = true) {
-        if (range.empty()) return;
+        if (range.empty()) {
+            return;
+        }
         RangeSize<R> l = range.size();
         reserve(l);
         p_len = l;
@@ -238,12 +251,16 @@ class StringBase {
         !IsFiniteRandomAccessRange<R> || !IsSame<T, RemoveCv<RangeValue<R>>>,
         bool
     > = true) {
-        if (range.empty()) return;
+        if (range.empty()) {
+            return;
+        }
         Size i = 0;
         for (; !range.empty(); range.pop_front()) {
             reserve(i + 1);
-            allocator_construct(p_buf.second(), &p_buf.first()[i],
-                range.front());
+            allocator_construct(
+                p_buf.second(), &p_buf.first()[i],
+                range.front()
+            );
             ++i;
             p_len = i;
         }
@@ -262,42 +279,60 @@ public:
     using ConstRange = CharRangeBase<T const>;
     using Allocator = A;
 
-    StringBase(A const &a = A()): p_len(0), p_cap(0),
-        p_buf(reinterpret_cast<Pointer>(&p_len), a) {}
+    StringBase(A const &a = A()):
+        p_len(0), p_cap(0),
+        p_buf(reinterpret_cast<Pointer>(&p_len), a)
+    {}
 
     explicit StringBase(Size n, T val = T(), A const &al = A()):
-    StringBase(al) {
-        if (!n) return;
+        StringBase(al)
+    {
+        if (!n) {
+            return;
+        }
         p_buf.first() = allocator_allocate(p_buf.second(), n + 1);
         p_len = p_cap = n;
         Pointer cur = p_buf.first(), last = p_buf.first() + n;
-        while (cur != last) *cur++ = val;
+        while (cur != last) {
+            *cur++ = val;
+        }
         *cur = '\0';
     }
 
-    StringBase(StringBase const &s): p_len(0), p_cap(0),
-    p_buf(reinterpret_cast<Pointer>(&p_len),
-          allocator_container_copy(s.p_buf.second())) {
-        if (!s.p_len) return;
+    StringBase(StringBase const &s):
+        p_len(0), p_cap(0), p_buf(reinterpret_cast<Pointer>(&p_len),
+        allocator_container_copy(s.p_buf.second()))
+    {
+        if (!s.p_len) {
+            return;
+        }
         reserve(s.p_len);
         p_len = s.p_len;
         memcpy(p_buf.first(), s.p_buf.first(), (p_len + 1) * sizeof(T));
     }
-    StringBase(StringBase const &s, A const &a): p_len(0), p_cap(0),
-    p_buf(reinterpret_cast<Pointer>(&p_len), a) {
-        if (!s.p_len) return;
+    StringBase(StringBase const &s, A const &a):
+        p_len(0), p_cap(0), p_buf(reinterpret_cast<Pointer>(&p_len), a)
+     {
+        if (!s.p_len) {
+            return;
+        }
         reserve(s.p_len);
         p_len = s.p_len;
         memcpy(p_buf.first(), s.p_buf.first(), (p_len + 1) * sizeof(T));
     }
-    StringBase(StringBase &&s): p_len(s.p_len), p_cap(s.p_cap),
-    p_buf(s.p_buf.first(), move(s.p_buf.second())) {
+    StringBase(StringBase &&s):
+        p_len(s.p_len), p_cap(s.p_cap),
+        p_buf(s.p_buf.first(), move(s.p_buf.second()))
+    {
         s.p_len = s.p_cap = 0;
         s.p_buf.first() = reinterpret_cast<Pointer>(&s.p_len);
     }
-    StringBase(StringBase &&s, A const &a): p_len(0), p_cap(0),
-    p_buf(reinterpret_cast<Pointer>(&p_len), a) {
-        if (!s.p_len) return;
+    StringBase(StringBase &&s, A const &a):
+        p_len(0), p_cap(0), p_buf(reinterpret_cast<Pointer>(&p_len), a)
+    {
+        if (!s.p_len) {
+            return;
+        }
         if (a != s.p_buf.second()) {
             reserve(s.p_cap);
             p_len = s.p_len;
@@ -311,8 +346,9 @@ public:
         s.p_buf.first() = &s.p_cap;
     }
 
-    StringBase(StringBase const &s, Size pos, Size len = npos,
-               A const &a = A()): StringBase(a) {
+    StringBase(
+        StringBase const &s, Size pos, Size len = npos, A const &a = A()
+    ): StringBase(a) {
         Size end = (len == npos) ? s.size() : (pos + len);
         Size nch = (end - pos);
         reserve(nch);
@@ -323,7 +359,9 @@ public:
 
     /* TODO: traits for utf-16/utf-32 string lengths, for now assume char */
     StringBase(ConstRange v, A const &a = A()): StringBase(a) {
-        if (!v.size()) return;
+        if (!v.size()) {
+            return;
+        }
         reserve(v.size());
         memcpy(p_buf.first(), &v[0], v.size());
         p_buf.first()[v.size()] = '\0';
@@ -342,23 +380,30 @@ public:
 
     template<typename R, typename = EnableIf<
         IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-    >> StringBase(R range, A const &a = A()): StringBase(a) {
+    >>
+    StringBase(R range, A const &a = A()): StringBase(a) {
         ctor_from_range(range);
     }
 
     ~StringBase() {
-        if (!p_cap) return;
+        if (!p_cap) {
+            return;
+        }
         allocator_deallocate(p_buf.second(), p_buf.first(), p_cap + 1);
     }
 
     void clear() {
-        if (!p_len) return;
+        if (!p_len) {
+            return;
+        }
         p_len = 0;
         *p_buf.first() = '\0';
     }
 
     StringBase &operator=(StringBase const &v) {
-        if (this == &v) return *this;
+        if (this == &v) {
+            return *this;
+        }
         clear();
         if (AllocatorPropagateOnContainerCopyAssignment<A>) {
             if ((p_buf.second() != v.p_buf.second()) && p_cap) {
@@ -373,40 +418,51 @@ public:
         if (p_len) {
             memcpy(p_buf.first(), v.p_buf.first(), p_len);
             p_buf.first()[p_len] = '\0';
-        } else p_buf.first() = reinterpret_cast<Pointer>(&p_len);
+        } else {
+            p_buf.first() = reinterpret_cast<Pointer>(&p_len);
+        }
         return *this;
     }
 
     StringBase &operator=(StringBase &&v) {
         clear();
-        if (p_cap) allocator_deallocate(p_buf.second(), p_buf.first(), p_cap);
-        if (AllocatorPropagateOnContainerMoveAssignment<A>)
+        if (p_cap) {
+            allocator_deallocate(p_buf.second(), p_buf.first(), p_cap);
+        }
+        if (AllocatorPropagateOnContainerMoveAssignment<A>) {
             p_buf.second() = v.p_buf.second();
+        }
         p_len = v.p_len;
         p_cap = v.p_cap;
         p_buf.~StrPair();
         new (&p_buf) StrPair(v.disown(), move(v.p_buf.second()));
-        if (!p_cap) p_buf.first() = reinterpret_cast<Pointer>(&p_len);
+        if (!p_cap) {
+            p_buf.first() = reinterpret_cast<Pointer>(&p_len);
+        }
         return *this;
     }
 
     StringBase &operator=(ConstRange v) {
         reserve(v.size());
-        if (v.size()) memcpy(p_buf.first(), &v[0], v.size());
+        if (v.size()) {
+            memcpy(p_buf.first(), &v[0], v.size());
+        }
         p_buf.first()[v.size()] = '\0';
         p_len = v.size();
         return *this;
     }
 
     template<typename U>
-    EnableIf<IsConvertible<U, Value const *> && !IsArray<U>, StringBase &>
-    operator=(U v) {
+    EnableIf<
+        IsConvertible<U, Value const *> && !IsArray<U>, StringBase &
+    > operator=(U v) {
         return operator=(ConstRange(v));
     }
 
     template<typename U, Size N>
-    EnableIf<IsConvertible<U *, Value const *>, StringBase &>
-    operator=(U (&v)[N]) {
+    EnableIf<
+        IsConvertible<U *, Value const *>, StringBase &
+    > operator=(U (&v)[N]) {
         return operator=(ConstRange(v));
     }
 
@@ -433,7 +489,9 @@ public:
     }
 
     void reserve(Size n) {
-        if (n <= p_cap) return;
+        if (n <= p_cap) {
+            return;
+        }
         Size oc = p_cap;
         if (!oc) {
             p_cap = max(n, Size(8));
@@ -495,7 +553,9 @@ public:
     }
 
     StringBase &append(ConstRange r) {
-        if (!r.size()) return *this;
+        if (!r.size()) {
+            return *this;
+        }
         reserve(p_len + r.size());
         memcpy(p_buf.first() + p_len, &r[0], r.size());
         p_len += r.size();
@@ -504,9 +564,13 @@ public:
     }
 
     StringBase &append(Size n, T c) {
-        if (!n) return *this;
+        if (!n) {
+            return *this;
+        }
         reserve(p_len + n);
-        for (Size i = 0; i < n; ++i) p_buf.first()[p_len + i] = c;
+        for (Size i = 0; i < n; ++i) {
+            p_buf.first()[p_len + i] = c;
+        }
         p_len += n;
         p_buf.first()[p_len] = '\0';
         return *this;
@@ -559,8 +623,9 @@ public:
         detail::swap_adl(p_len, v.p_len);
         detail::swap_adl(p_cap, v.p_cap);
         detail::swap_adl(p_buf.first(), v.p_buf.first());
-        if (AllocatorPropagateOnContainerSwap<A>)
+        if (AllocatorPropagateOnContainerSwap<A>) {
             detail::swap_adl(p_buf.second(), v.p_buf.second());
+        }
     }
 
     Size to_hash() const {
@@ -576,7 +641,8 @@ using String = StringBase<char>;
 
 /* string literals */
 
-inline namespace literals { inline namespace string_literals {
+inline namespace literals {
+inline namespace string_literals {
     inline String operator "" _s(char const *str, Size len) {
         return String(ConstCharRange(str, len));
     }
@@ -584,11 +650,14 @@ inline namespace literals { inline namespace string_literals {
     inline ConstCharRange operator "" _S(char const *str, Size len) {
         return ConstCharRange(str, len);
     }
-} }
+}
+}
 
 namespace detail {
-    template<typename T, bool = IsConvertible<T, ConstCharRange>,
-                         bool = IsConvertible<T, char>>
+    template<
+        typename T, bool = IsConvertible<T, ConstCharRange>,
+        bool = IsConvertible<T, char>
+    >
     struct ConcatPut;
 
     template<typename T, bool B>
@@ -611,14 +680,19 @@ namespace detail {
 template<typename R, typename T, typename F>
 bool concat(R &&sink, T const &v, ConstCharRange sep, F func) {
     auto range = ostd::iter(v);
-    if (range.empty()) return true;
+    if (range.empty()) {
+        return true;
+    }
     for (;;) {
         if (!detail::ConcatPut<
             decltype(func(range.front()))
-        >::put(sink, func(range.front())))
+        >::put(sink, func(range.front()))) {
             return false;
+        }
         range.pop_front();
-        if (range.empty()) break;
+        if (range.empty()) {
+            break;
+        }
         sink.put_n(&sep[0], sep.size());
     }
     return true;
@@ -627,13 +701,18 @@ bool concat(R &&sink, T const &v, ConstCharRange sep, F func) {
 template<typename R, typename T>
 bool concat(R &&sink, T const &v, ConstCharRange sep = " ") {
     auto range = ostd::iter(v);
-    if (range.empty()) return true;
+    if (range.empty()) {
+        return true;
+    }
     for (;;) {
         ConstCharRange ret = range.front();
-        if (!ret.size() || (sink.put_n(&ret[0], ret.size()) != ret.size()))
+        if (!ret.size() || (sink.put_n(&ret[0], ret.size()) != ret.size())) {
             return false;
+        }
         range.pop_front();
-        if (range.empty()) break;
+        if (range.empty()) {
+            break;
+        }
         sink.put_n(&sep[0], sep.size());
     }
     return true;
@@ -674,7 +753,7 @@ namespace detail {
     };
 
     template<typename T, typename R>
-    auto test_stringify(int) ->
+    static auto test_stringify(int) ->
         BoolConstant<IsSame<decltype(declval<T>().stringify()), String>>;
 
     template<typename T, typename R>
@@ -682,14 +761,15 @@ namespace detail {
         (declval<R &>())) *);
 
     template<typename, typename>
-    False test_stringify(...);
+    static False test_stringify(...);
 
     template<typename T, typename R>
     constexpr bool StringifyTest = decltype(test_stringify<T, R>(0))::value;
 
     template<typename T>
-    True test_iterable(decltype(ostd::iter(declval<T>())) *);
-    template<typename> static False test_iterable(...);
+    static True test_iterable(decltype(ostd::iter(declval<T>())) *);
+    template<typename>
+    static False test_iterable(...);
 
     template<typename T>
     constexpr bool IterableTest = decltype(test_iterable<T>(0))::value;
@@ -710,7 +790,9 @@ struct ToString<T, EnableIf<detail::IterableTest<T>>> {
             RemoveConst<RemoveReference<
                 RangeReference<decltype(ostd::iter(v))>
             >>
-        >())) ret += x.get();
+        >())) {
+            ret += x.get();
+        }
         ret += "}";
         return ret;
     }
@@ -726,7 +808,9 @@ struct ToString<T, EnableIf<
     String operator()(T const &v) const {
         auto app = appender<String>();
         detail::TostrRange<AppenderRange<String>> sink(app);
-        if (!v.to_string(sink)) return String();
+        if (!v.to_string(sink)) {
+            return String();
+        }
         return move(app.get());
     }
 };
@@ -738,18 +822,19 @@ namespace detail {
         int n = snprintf(buf, sizeof(buf), fmt, v);
         s.clear();
         s.reserve(n);
-        if (n >= int(sizeof(buf)))
+        if (n >= int(sizeof(buf))) {
             snprintf(s.data(), n + 1, fmt, v);
-        else if (n > 0)
+        } else if (n > 0) {
             memcpy(s.data(), buf, n + 1);
-        else {
+        } else {
             s.clear();
         }
         *reinterpret_cast<Size *>(&s) = n;
     }
 }
 
-template<> struct ToString<bool> {
+template<>
+struct ToString<bool> {
     using Argument = bool;
     using Result = String;
     String operator()(bool b) {
@@ -757,7 +842,8 @@ template<> struct ToString<bool> {
     }
 };
 
-template<> struct ToString<char> {
+template<>
+struct ToString<char> {
     using Argument = char;
     using Result = String;
     String operator()(char c) {
@@ -768,7 +854,8 @@ template<> struct ToString<char> {
 };
 
 #define OSTD_TOSTR_NUM(T, fmt) \
-template<> struct ToString<T> { \
+template<> \
+struct ToString<T> { \
     using Argument = T; \
     using Result = String; \
     String operator()(T v) { \
@@ -794,7 +881,8 @@ OSTD_TOSTR_NUM(ldouble, "%Lf")
 
 #undef OSTD_TOSTR_NUM
 
-template<typename T> struct ToString<T *> {
+template<typename T>
+struct ToString<T *> {
     using Argument = T *;
     using Result = String;
     String operator()(Argument v) {
@@ -804,7 +892,8 @@ template<typename T> struct ToString<T *> {
     }
 };
 
-template<> struct ToString<char const *> {
+template<>
+struct ToString<char const *> {
     using Argument = char const *;
     using Result = String;
     String operator()(char const *s) {
@@ -812,7 +901,8 @@ template<> struct ToString<char const *> {
     }
 };
 
-template<> struct ToString<char *> {
+template<>
+struct ToString<char *> {
     using Argument = char *;
     using Result = String;
     String operator()(char *s) {
@@ -820,7 +910,8 @@ template<> struct ToString<char *> {
     }
 };
 
-template<> struct ToString<String> {
+template<>
+struct ToString<String> {
     using Argument = String;
     using Result = String;
     String operator()(Argument const &s) {
@@ -828,7 +919,8 @@ template<> struct ToString<String> {
     }
 };
 
-template<> struct ToString<CharRange> {
+template<>
+struct ToString<CharRange> {
     using Argument = CharRange;
     using Result = String;
     String operator()(Argument const &s) {
@@ -836,7 +928,8 @@ template<> struct ToString<CharRange> {
     }
 };
 
-template<> struct ToString<ConstCharRange> {
+template<>
+struct ToString<ConstCharRange> {
     using Argument = ConstCharRange;
     using Result = String;
     String operator()(Argument const &s) {
@@ -844,7 +937,8 @@ template<> struct ToString<ConstCharRange> {
     }
 };
 
-template<typename T, typename U> struct ToString<Pair<T, U>> {
+template<typename T, typename U>
+struct ToString<Pair<T, U>> {
     using Argument = Pair<T, U>;
     using Result = String;
     String operator()(Argument const &v) {
@@ -864,7 +958,8 @@ namespace detail {
         static void append(String &ret, T const &tup) {
             ret += ", ";
             ret += ToString<RemoveCv<RemoveReference<
-                decltype(ostd::get<I>(tup))>>>()(ostd::get<I>(tup));
+                decltype(ostd::get<I>(tup))
+            >>>()(ostd::get<I>(tup));
             TupleToString<I + 1, N>::append(ret, tup);
         }
     };
@@ -880,13 +975,15 @@ namespace detail {
         template<typename T>
         static void append(String &ret, T const &tup) {
             ret += ToString<RemoveCv<RemoveReference<
-                decltype(ostd::get<0>(tup))>>>()(ostd::get<0>(tup));
+                decltype(ostd::get<0>(tup))
+            >>>()(ostd::get<0>(tup));
             TupleToString<1, N>::append(ret, tup);
         }
     };
 }
 
-template<typename ...T> struct ToString<Tuple<T...>> {
+template<typename ...T>
+struct ToString<Tuple<T...>> {
     using Argument = Tuple<T...>;
     using Result = String;
     String operator()(Argument const &v) {
@@ -948,15 +1045,21 @@ public:
     }
     TempCString(R input, RemoveCv<RangeValue<R>> *sbuf, Size bufsize)
     : p_buf(nullptr), p_allocated(false) {
-        if (input.empty()) return;
+        if (input.empty()) {
+            return;
+        }
         if (input.size() >= bufsize) {
             p_buf = new RemoveCv<RangeValue<R>>[input.size() + 1];
             p_allocated = true;
-        } else p_buf = sbuf;
+        } else {
+            p_buf = sbuf;
+        }
         p_buf[input.copy(p_buf)] = '\0';
     }
     ~TempCString() {
-        if (p_allocated) delete[] p_buf;
+        if (p_allocated) {
+            delete[] p_buf;
+        }
     }
 
     TempCString &operator=(TempCString const &) = delete;
@@ -975,8 +1078,9 @@ public:
 };
 
 template<typename R>
-inline TempCString<R> to_temp_cstr(R input, RemoveCv<RangeValue<R>> *buf,
-                                   Size bufsize) {
+inline TempCString<R> to_temp_cstr(
+    R input, RemoveCv<RangeValue<R>> *buf, Size bufsize
+) {
     return TempCString<R>(input, buf, bufsize);
 }
 
diff --git a/ostd/thread.hh b/ostd/thread.hh
index 449aaea..6d1f81c 100644
--- a/ostd/thread.hh
+++ b/ostd/thread.hh
@@ -109,30 +109,38 @@ struct Thread {
     Thread(): p_thread(0) {}
     Thread(Thread &&o): p_thread(o.p_thread) { o.p_thread = 0; }
 
-    template<typename F, typename ...A,
-             typename = EnableIf<!IsSame<Decay<F>, Thread>>>
+    template<
+        typename F, typename ...A, typename = EnableIf<!IsSame<Decay<F>, Thread>>
+    >
     Thread(F &&func, A &&...args) {
         using FuncT = Tuple<Decay<F>, Decay<A>...>;
-        Box<FuncT> p(new FuncT(detail::decay_copy(forward<F>(func)),
-                               detail::decay_copy(forward<A>(args))...));
-        int res = pthread_create(&p_thread, 0, &detail::thread_proxy<FuncT>, p.get());
-        if (!res)
+        Box<FuncT> p(new FuncT(
+            detail::decay_copy(forward<F>(func)),
+            detail::decay_copy(forward<A>(args))...
+        ));
+        int res = pthread_create(
+            &p_thread, 0, &detail::thread_proxy<FuncT>, p.get()
+        );
+        if (!res) {
             p.release();
-        else
+        } else {
             p_thread = 0;
+        }
     }
 
     Thread &operator=(Thread &&other) {
-        if (joinable())
+        if (joinable()) {
             abort();
+        }
         p_thread = other.p_thread;
         other.p_thread = 0;
         return *this;
     }
 
     ~Thread() {
-        if (joinable())
+        if (joinable()) {
             abort();
+        }
     }
 
     explicit operator bool() const { return joinable(); }
@@ -152,8 +160,9 @@ struct Thread {
 
     bool detach() {
         bool ret = false;
-        if (p_thread)
+        if (p_thread) {
             ret = !pthread_detach(p_thread);
+        }
         p_thread = 0;
         return ret;
     }
@@ -174,8 +183,9 @@ struct Thread {
 #elif defined(_SC_NPROCESSORS_ONLN)
             count = ostd::uint(sysconf(_SC_NPROCESSORS_ONLN));
 #endif
-            if (count <= 0)
+            if (count <= 0) {
                 count = 1;
+            }
         }
         return count;
     }
diff --git a/ostd/tuple.hh b/ostd/tuple.hh
index 9f2f9f7..31477ff 100644
--- a/ostd/tuple.hh
+++ b/ostd/tuple.hh
@@ -17,7 +17,8 @@ namespace ostd {
 
 /* tuple size */
 
-template<typename ...T> constexpr Size TupleSize<Tuple<T...>> = sizeof...(T);
+template<typename ...T>
+constexpr Size TupleSize<Tuple<T...>> = sizeof...(T);
 
 /* tuple element */
 
@@ -32,71 +33,100 @@ namespace detail {
     template<Size I, typename H, bool = IsEmpty<H>>
     struct TupleLeaf {
         constexpr TupleLeaf(): p_value() {
-            static_assert(!IsReference<H>,
-                "attempt to default construct a reference element in a tuple");
+            static_assert(
+                !IsReference<H>,
+                "attempt to default construct a reference element in a tuple"
+            );
         }
 
         template<typename A>
         TupleLeaf(Constant<int, 0>, A const &): p_value() {
-            static_assert(!IsReference<H>,
-                "attempt to default construct a reference element in a tuple");
+            static_assert(
+                !IsReference<H>,
+                "attempt to default construct a reference element in a tuple"
+            );
         }
         template<typename A>
         TupleLeaf(Constant<int, 1>, A const &a): p_value(allocator_arg, a) {
-            static_assert(!IsReference<H>,
-                "attempt to default construct a reference element in a tuple");
+            static_assert(
+                !IsReference<H>,
+                "attempt to default construct a reference element in a tuple"
+            );
         }
         template<typename A>
         TupleLeaf(Constant<int, 2>, A const &a): p_value(a) {
-            static_assert(!IsReference<H>,
-                "attempt to default construct a reference element in a tuple");
+            static_assert(
+                !IsReference<H>,
+                "attempt to default construct a reference element in a tuple"
+            );
         }
 
         template<typename T, typename = EnableIf<
             !IsSame<Decay<T>, TupleLeaf> && IsConstructible<H, T>
         >>
         explicit TupleLeaf(T &&t): p_value(forward<T>(t)) {
-            static_assert(!IsReference<H> ||
-                          (IsLvalueReference<H> &&
-                           (IsLvalueReference<T> ||
-                            IsSame<RemoveReference<T>,
-                                   ReferenceWrapper<RemoveReference<H>>>)) ||
-                           (IsRvalueReference<H> &&
-                            !IsLvalueReference<T>),
-            "attempt to construct a reference element in a tuple with an rvalue");
+            static_assert(
+                !IsReference<H> || (
+                    IsLvalueReference<H> && (
+                        IsLvalueReference<T> || IsSame<
+                            RemoveReference<T>,
+                            ReferenceWrapper<RemoveReference<H>>
+                        >
+                    )
+                ) || (IsRvalueReference<H> && !IsLvalueReference<T>),
+                "attempt to construct a reference element in a tuple with an rvalue"
+            );
         }
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 0>, A const &, T &&t):
-                           p_value(forward<T>(t)) {
-            static_assert(!IsLvalueReference<H> ||
-                          (IsLvalueReference<H> &&
-                           (IsLvalueReference<T> ||
-                            IsSame<RemoveReference<T>,
-                                   ReferenceWrapper<RemoveReference<H>>>)),
-            "attempt to construct a reference element in a tuple with an rvalue");
+            p_value(forward<T>(t))
+        {
+            static_assert(
+                !IsLvalueReference<H> || (
+                    IsLvalueReference<H> && (
+                        IsLvalueReference<T> || IsSame<
+                            RemoveReference<T>,
+                            ReferenceWrapper<RemoveReference<H>>
+                        >
+                    )
+                ),
+                "attempt to construct a reference element in a tuple with an rvalue"
+            );
         }
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 1>, A const &a, T &&t):
-                           p_value(allocator_arg, a, forward<T>(t)) {
-            static_assert(!IsLvalueReference<H> ||
-                          (IsLvalueReference<H> &&
-                           (IsLvalueReference<T> ||
-                            IsSame<RemoveReference<T>,
-                                   ReferenceWrapper<RemoveReference<H>>>)),
-            "attempt to construct a reference element in a tuple with an rvalue");
+            p_value(allocator_arg, a, forward<T>(t))
+        {
+            static_assert(
+                !IsLvalueReference<H> || (
+                    IsLvalueReference<H> && (
+                        IsLvalueReference<T> || IsSame<
+                            RemoveReference<T>,
+                            ReferenceWrapper<RemoveReference<H>>
+                        >
+                    )
+                ),
+                "attempt to construct a reference element in a tuple with an rvalue"
+            );
         }
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 2>, A const &a, T &&t):
-                           p_value(forward<T>(t), a) {
-            static_assert(!IsLvalueReference<H> ||
-                          (IsLvalueReference<H> &&
-                           (IsLvalueReference<T> ||
-                            IsSame<RemoveReference<T>,
-                                   ReferenceWrapper<RemoveReference<H>>>)),
-            "attempt to construct a reference element in a tuple with an rvalue");
+            p_value(forward<T>(t), a)
+        {
+            static_assert(
+                !IsLvalueReference<H> || (
+                    IsLvalueReference<H> && (
+                        IsLvalueReference<T> || IsSame<
+                            RemoveReference<T>,
+                            ReferenceWrapper<RemoveReference<H>>
+                        >
+                    )
+                ),
+                "attempt to construct a reference element in a tuple with an rvalue"
+            );
         }
 
         TupleLeaf(TupleLeaf const &) = default;
@@ -129,26 +159,31 @@ namespace detail {
 
         template<typename A>
         TupleLeaf(Constant<int, 1>, A const &a):
-            H(allocator_arg, a) {}
+            H(allocator_arg, a)
+        {}
 
         template<typename A>
         TupleLeaf(Constant<int, 2>, A const &a): H(a) {}
 
         template<typename T, typename = EnableIf<
             !IsSame<Decay<T>, TupleLeaf> && IsConstructible<H, T>
-        >> explicit TupleLeaf(T &&t): H(forward<T>(t)) {}
+        >>
+        explicit TupleLeaf(T &&t): H(forward<T>(t)) {}
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 0>, A const &, T &&t):
-            H(forward<T>(t)) {}
+            H(forward<T>(t))
+        {}
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 1>, A const &a, T &&t):
-            H(allocator_arg, a, forward<T>(t)) {}
+            H(allocator_arg, a, forward<T>(t))
+        {}
 
         template<typename T, typename A>
         explicit TupleLeaf(Constant<int, 2>, A const &a, T &&t):
-            H(forward<T>(t), a) {}
+            H(forward<T>(t), a)
+        {}
 
         TupleLeaf(TupleLeaf const &) = default;
         TupleLeaf(TupleLeaf &&) = default;
@@ -187,58 +222,73 @@ namespace detail {
     constexpr bool TupleAllDefaultConstructible = detail::Undefined<T>();
 
     template<typename ...A>
-    constexpr bool TupleAllDefaultConstructible<TupleTypes<A...>>
-        = TupleAll<IsDefaultConstructible<A>...>;
+    constexpr bool TupleAllDefaultConstructible<TupleTypes<A...>> =
+        TupleAll<IsDefaultConstructible<A>...>;
 }
 
 /* tuple implementation */
 
 namespace detail {
-    template<typename, typename ...> struct TupleBase;
+    template<typename, typename ...>
+    struct TupleBase;
 
     template<Size ...I, typename ...A>
     struct TupleBase<TupleIndices<I...>, A...>: TupleLeaf<I, A>... {
         constexpr TupleBase() {}
 
-        template<Size ...Ia, typename ...Aa,
-                 Size ...Ib, typename ...Ab, typename ...T>
-        explicit TupleBase(TupleIndices<Ia...>, TupleTypes<Aa...>,
-                           TupleIndices<Ib...>, TupleTypes<Ab...>,
-                           T &&...t):
+        template<
+            Size ...Ia, typename ...Aa, Size ...Ib,
+            typename ...Ab, typename ...T
+        >
+        explicit TupleBase(
+            TupleIndices<Ia...>, TupleTypes<Aa...>,
+            TupleIndices<Ib...>, TupleTypes<Ab...>, T &&...t
+        ):
             TupleLeaf<Ia, Aa>(forward<T>(t))...,
-            TupleLeaf<Ib, Ab>()... {}
+            TupleLeaf<Ib, Ab>()...
+        {}
 
-        template<typename Alloc, Size ...Ia, typename ...Aa,
-                 Size ...Ib, typename ...Ab, typename ...T>
-        explicit TupleBase(AllocatorArg, Alloc const &a,
-                           TupleIndices<Ia...>, TupleTypes<Aa...>,
-                           TupleIndices<Ib...>, TupleTypes<Ab...>,
-                           T &&...t):
-            TupleLeaf<Ia, Aa>(UsesAllocatorConstructor<Aa, Alloc, T>, a,
-                forward<T>(t))...,
+        template<
+            typename Alloc, Size ...Ia, typename ...Aa,
+            Size ...Ib, typename ...Ab, typename ...T
+        >
+        explicit TupleBase(
+            AllocatorArg, Alloc const &a,
+            TupleIndices<Ia...>, TupleTypes<Aa...>,
+            TupleIndices<Ib...>, TupleTypes<Ab...>, T &&...t
+        ):
+            TupleLeaf<Ia, Aa>(
+                UsesAllocatorConstructor<Aa, Alloc, T>, a,
+                forward<T>(t)
+            )...,
             TupleLeaf<Ib, Ab>(UsesAllocatorConstructor<Ab, Alloc>, a)...
         {}
 
         template<typename T, typename = EnableIf<
             TupleConstructible<T, Tuple<A...>>
-        >> TupleBase(T &&t): TupleLeaf<I, A>(forward<
-            TupleElement<I, MakeTupleTypes<T>>
-        >(get<I>(t)))... {}
+        >>
+        TupleBase(T &&t):
+            TupleLeaf<I, A>(
+                forward<TupleElement<I, MakeTupleTypes<T>>>(get<I>(t))
+            )...
+        {}
 
         template<typename Alloc, typename T, typename = EnableIf<
             TupleConvertible<T, Tuple<A...>>
-        >> TupleBase(AllocatorArg, Alloc const &a, T &&t):
-            TupleLeaf<I, A>(UsesAllocatorConstructor<
-                A, Alloc, TupleElement<I, MakeTupleTypes<T>>
-            >, a, forward<TupleElement<I, MakeTupleTypes<T>>>(get<I>(t)))...
+        >>
+        TupleBase(AllocatorArg, Alloc const &a, T &&t):
+            TupleLeaf<I, A>(
+                UsesAllocatorConstructor<
+                    A, Alloc, TupleElement<I, MakeTupleTypes<T>>
+                >, a, forward<TupleElement<I, MakeTupleTypes<T>>>(get<I>(t))
+            )...
         {}
 
         template<typename T>
-        EnableIf<TupleAssignable<T, Tuple<A...>>, TupleBase &>
-        operator=(T &&t) {
-            tuple_swallow(TupleLeaf<I, A>::operator=(forward<
-                TupleElement<I, MakeTupleTypes<T>>
-            >(get<I>(t)))...);
+        EnableIf<TupleAssignable<T, Tuple<A...>>, TupleBase &> operator=(T &&t) {
+            tuple_swallow(TupleLeaf<I, A>::operator=(
+                forward<TupleElement<I, MakeTupleTypes<T>>>(get<I>(t))
+            )...);
             return *this;
         }
 
@@ -246,19 +296,23 @@ namespace detail {
         TupleBase(TupleBase &&) = default;
 
         TupleBase &operator=(TupleBase const &t) {
-            tuple_swallow(TupleLeaf<I, A>::operator=((
-                static_cast<TupleLeaf<I, A> const &>(t)).get())...);
+            tuple_swallow(TupleLeaf<I, A>::operator=(
+                (static_cast<TupleLeaf<I, A> const &>(t)).get()
+            )...);
             return *this;
         }
 
         TupleBase &operator=(TupleBase &&t) {
-            tuple_swallow(TupleLeaf<I, A>::operator=(forward<A>
-                ((static_cast<TupleLeaf<I, A> &>(t)).get()))...);
+            tuple_swallow(TupleLeaf<I, A>::operator=(
+                forward<A>((static_cast<TupleLeaf<I, A> &>(t)).get())
+            )...);
             return *this;
         }
 
         void swap(TupleBase &t) {
-            tuple_swallow(TupleLeaf<I, A>::swap(static_cast<TupleLeaf<I, A> &>(t))...);
+            tuple_swallow(
+                TupleLeaf<I, A>::swap(static_cast<TupleLeaf<I, A> &>(t))...
+            );
         }
     };
 } /* namespace detail */
@@ -283,110 +337,130 @@ class Tuple {
 public:
     template<bool D = true, typename = EnableIf<
         detail::TupleAll<(D && IsDefaultConstructible<A>)...>
-    >> Tuple() {}
+    >>
+    Tuple() {}
 
     explicit Tuple(A const &...t):
-        p_base(detail::MakeTupleIndices<sizeof...(A)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(A)>(),
-               detail::MakeTupleIndices<0>(),
-               detail::MakeTupleTypes<Tuple, 0>(), t...) {}
-
-    template<typename Alloc>
-    Tuple(AllocatorArg, Alloc const &a, A const &...t):
-        p_base(allocator_arg, a,
+        p_base(
             detail::MakeTupleIndices<sizeof...(A)>(),
             detail::MakeTupleTypes<Tuple, sizeof...(A)>(),
             detail::MakeTupleIndices<0>(),
-            detail::MakeTupleTypes<Tuple, 0>(), t...) {}
+            detail::MakeTupleTypes<Tuple, 0>(), t...
+        )
+    {}
+
+    template<typename Alloc>
+    Tuple(AllocatorArg, Alloc const &a, A const &...t):
+        p_base(
+            allocator_arg, a,
+            detail::MakeTupleIndices<sizeof...(A)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(A)>(),
+            detail::MakeTupleIndices<0>(),
+            detail::MakeTupleTypes<Tuple, 0>(), t...
+        )
+    {}
 
     template<typename ...T, EnableIf<
         (sizeof...(T) <= sizeof...(A)) &&
         detail::TupleConvertible<
             Tuple<T...>,
-            detail::MakeTupleTypes<Tuple,
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple,
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         > &&
         detail::TupleAllDefaultConstructible<
-            detail::MakeTupleTypes<Tuple, sizeof...(A),
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple, sizeof...(A),
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         >, bool
     > = true>
     Tuple(T &&...t):
-        p_base(detail::MakeTupleIndices<sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
-               detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
-               forward<T>(t)...) {}
+        p_base(
+            detail::MakeTupleIndices<sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
+            detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
+            forward<T>(t)...
+        )
+    {}
 
     template<typename ...T, EnableIf<
         (sizeof...(T) <= sizeof...(A)) &&
         detail::TupleConstructible<
             Tuple<T...>,
-            detail::MakeTupleTypes<Tuple,
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple,
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         > &&
         !detail::TupleConvertible<
             Tuple<T...>,
-            detail::MakeTupleTypes<Tuple,
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple,
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         > &&
         detail::TupleAllDefaultConstructible<
-            detail::MakeTupleTypes<Tuple, sizeof...(A),
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple, sizeof...(A),
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         >, bool
     > = true>
     Tuple(T &&...t):
-        p_base(detail::MakeTupleIndices<sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
-               detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
-               forward<T>(t)...) {}
+        p_base(
+            detail::MakeTupleIndices<sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
+            detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
+            forward<T>(t)...
+        )
+    {}
 
     template<typename Alloc, typename ...T, typename = EnableIf<
         (sizeof...(T) <= sizeof...(A)) &&
         detail::TupleConvertible<
             Tuple<T...>,
-            detail::MakeTupleTypes<Tuple,
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple,
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         > &&
         detail::TupleAllDefaultConstructible<
-            detail::MakeTupleTypes<Tuple, sizeof...(A),
-                (sizeof...(T) < sizeof...(A)) ? sizeof...(T)
-                                              : sizeof...(A)
+            detail::MakeTupleTypes<
+                Tuple, sizeof...(A),
+                (sizeof...(T) < sizeof...(A)) ? sizeof...(T) : sizeof...(A)
             >
         >
     >> Tuple(AllocatorArg, Alloc const &a, T &&...t):
-        p_base(allocator_arg, a, detail::MakeTupleIndices<sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
-               detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
-               detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
-               forward<T>(t)...) {}
+        p_base(
+            allocator_arg, a, detail::MakeTupleIndices<sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(T)>(),
+            detail::MakeTupleIndices<sizeof...(A), sizeof...(T)>(),
+            detail::MakeTupleTypes<Tuple, sizeof...(A), sizeof...(T)>(),
+            forward<T>(t)...
+        )
+    {}
 
     template<typename T, EnableIf<
         detail::TupleConvertible<T, Tuple>, bool
-    > = true> Tuple(T &&t): p_base(forward<T>(t)) {}
+    > = true>
+    Tuple(T &&t): p_base(forward<T>(t)) {}
 
     template<typename T, EnableIf<
         detail::TupleConstructible<T, Tuple> &&
         !detail::TupleConvertible<T, Tuple>, bool
-    > = true> Tuple(T &&t): p_base(forward<T>(t)) {}
+    > = true>
+    Tuple(T &&t): p_base(forward<T>(t)) {}
 
     template<typename Alloc, typename T, typename = EnableIf<
         detail::TupleConvertible<T, Tuple>
-    >> Tuple(AllocatorArg, Alloc const &a, T &&t):
-        p_base(allocator_arg, a, forward<T>(t)) {}
+    >>
+    Tuple(AllocatorArg, Alloc const &a, T &&t):
+        p_base(allocator_arg, a, forward<T>(t))
+    {}
 
     template<typename T, typename = EnableIf<detail::TupleAssignable<T, Tuple>>>
     Tuple &operator=(T &&t) {
@@ -473,8 +547,7 @@ namespace detail {
 }
 
 template<typename ...T>
-inline Tuple<typename detail::MakeTupleReturn<T>::Type...>
-make_tuple(T &&...t) {
+inline Tuple<typename detail::MakeTupleReturn<T>::Type...> make_tuple(T &&...t) {
     return Tuple<typename detail::MakeTupleReturn<T>::Type...>(forward<T>(t)...);
 }
 
diff --git a/ostd/type_traits.hh b/ostd/type_traits.hh
index 909e9db..029372b 100644
--- a/ostd/type_traits.hh
+++ b/ostd/type_traits.hh
@@ -14,14 +14,21 @@ namespace ostd {
 /* forward declarations */
 
 namespace detail {
-    template<typename> struct RemoveCvBase;
-    template<typename> struct AddLr;
-    template<typename> struct AddRr;
-    template<typename> struct AddConstBase;
-    template<typename> struct RemoveReferenceBase;
-    template<typename> struct RemoveAllExtentsBase;
+    template<typename>
+    struct RemoveCvBase;
+    template<typename>
+    struct AddLr;
+    template<typename>
+    struct AddRr;
+    template<typename>
+    struct AddConstBase;
+    template<typename>
+    struct RemoveReferenceBase;
+    template<typename>
+    struct RemoveAllExtentsBase;
 
-    template<typename ...> struct CommonTypeBase;
+    template<typename ...>
+    struct CommonTypeBase;
 }
 
 template<typename T>
@@ -43,7 +50,8 @@ template<typename T>
 using RemoveAllExtents = typename detail::RemoveAllExtentsBase<T>::Type;
 
 namespace detail {
-    template<typename T> AddRvalueReference<T> declval_in();
+    template<typename T>
+    AddRvalueReference<T> declval_in();
 }
 
 /* integral constant */
@@ -65,12 +73,15 @@ using BoolConstant = Constant<bool, val>;
 using True = BoolConstant<true>;
 using False = BoolConstant<false>;
 
-template<typename T, T val> constexpr T Constant<T, val>::value;
+template<typename T, T val>
+constexpr T Constant<T, val>::value;
 
 /* type equality */
 
-template<typename, typename> constexpr bool IsSame       = false;
-template<typename T        > constexpr bool IsSame<T, T> = true;
+template<typename, typename>
+constexpr bool IsSame = false;
+template<typename T>
+constexpr bool IsSame<T, T> = true;
 
 /* is void */
 
@@ -85,27 +96,43 @@ constexpr bool IsNullPointer = IsSame<RemoveCv<T>, Nullptr>;
 /* is integer */
 
 namespace detail {
-    template<typename> constexpr bool IsIntegralBase = false;
+    template<typename>
+    constexpr bool IsIntegralBase = false;
 
-    template<> constexpr bool IsIntegralBase<bool  > = true;
-    template<> constexpr bool IsIntegralBase<char  > = true;
-    template<> constexpr bool IsIntegralBase<short > = true;
-    template<> constexpr bool IsIntegralBase<int   > = true;
-    template<> constexpr bool IsIntegralBase<long  > = true;
+    template<>
+    constexpr bool IsIntegralBase<bool> = true;
+    template<>
+    constexpr bool IsIntegralBase<char> = true;
+    template<>
+    constexpr bool IsIntegralBase<short> = true;
+    template<>
+    constexpr bool IsIntegralBase<int> = true;
+    template<>
+    constexpr bool IsIntegralBase<long> = true;
 
-    template<> constexpr bool IsIntegralBase<sbyte > = true;
-    template<> constexpr bool IsIntegralBase<byte  > = true;
-    template<> constexpr bool IsIntegralBase<ushort> = true;
-    template<> constexpr bool IsIntegralBase<uint  > = true;
-    template<> constexpr bool IsIntegralBase<ulong > = true;
-    template<> constexpr bool IsIntegralBase<llong > = true;
-    template<> constexpr bool IsIntegralBase<ullong> = true;
+    template<>
+    constexpr bool IsIntegralBase<sbyte> = true;
+    template<>
+    constexpr bool IsIntegralBase<byte> = true;
+    template<>
+    constexpr bool IsIntegralBase<ushort> = true;
+    template<>
+    constexpr bool IsIntegralBase<uint> = true;
+    template<>
+    constexpr bool IsIntegralBase<ulong> = true;
+    template<>
+    constexpr bool IsIntegralBase<llong> = true;
+    template<>
+    constexpr bool IsIntegralBase<ullong> = true;
 
 #ifndef OSTD_TYPES_CHAR_16_32_NO_BUILTINS
-    template<> constexpr bool IsIntegralBase<Char16> = true;
-    template<> constexpr bool IsIntegralBase<Char32> = true;
+    template<>
+    constexpr bool IsIntegralBase<Char16> = true;
+    template<>
+    constexpr bool IsIntegralBase<Char32> = true;
 #endif
-    template<> constexpr bool IsIntegralBase<Wchar > = true;
+    template<>
+    constexpr bool IsIntegralBase<Wchar> = true;
 }
 
 template<typename T>
@@ -114,12 +141,16 @@ constexpr bool IsIntegral = detail::IsIntegralBase<RemoveCv<T>>;
 /* is floating point */
 
 namespace detail {
-    template<typename> constexpr bool IsFloatingPointBase = false;
+    template<typename>
+    constexpr bool IsFloatingPointBase = false;
 
-    template<> constexpr bool IsFloatingPointBase<float > = true;
-    template<> constexpr bool IsFloatingPointBase<double> = true;
+    template<>
+    constexpr bool IsFloatingPointBase<float> = true;
+    template<>
+    constexpr bool IsFloatingPointBase<double> = true;
 
-    template<> constexpr bool IsFloatingPointBase<ldouble> = true;
+    template<>
+    constexpr bool IsFloatingPointBase<ldouble> = true;
 }
 
 template<typename T>
@@ -127,15 +158,20 @@ constexpr bool IsFloatingPoint = detail::IsFloatingPointBase<RemoveCv<T>>;
 
 /* is array */
 
-template<typename          > constexpr bool IsArray       = false;
-template<typename T        > constexpr bool IsArray<T[ ]> = true;
-template<typename T, Size N> constexpr bool IsArray<T[N]> = true;
+template<typename>
+constexpr bool IsArray = false;
+template<typename T>
+constexpr bool IsArray<T[]> = true;
+template<typename T, Size N> 
+constexpr bool IsArray<T[N]> = true;
 
 /* is pointer */
 
 namespace detail {
-    template<typename  > constexpr bool IsPointerBase      = false;
-    template<typename T> constexpr bool IsPointerBase<T *> = true;
+    template<typename>
+    constexpr bool IsPointerBase = false;
+    template<typename T>
+    constexpr bool IsPointerBase<T *> = true;
 }
 
 template<typename T>
@@ -143,13 +179,17 @@ constexpr bool IsPointer = detail::IsPointerBase<RemoveCv<T>>;
 
 /* is lvalue reference */
 
-template<typename  > constexpr bool IsLvalueReference      = false;
-template<typename T> constexpr bool IsLvalueReference<T &> = true;
+template<typename>
+constexpr bool IsLvalueReference = false;
+template<typename T>
+constexpr bool IsLvalueReference<T &> = true;
 
 /* is rvalue reference */
 
-template<typename  > constexpr bool IsRvalueReference       = false;
-template<typename T> constexpr bool IsRvalueReference<T &&> = true;
+template<typename>
+constexpr bool IsRvalueReference = false;
+template<typename T>
+constexpr bool IsRvalueReference<T &&> = true;
 
 /* is reference */
 
@@ -173,22 +213,28 @@ template<typename T> constexpr bool IsClass = __is_class(T);
 namespace detail {
     struct FunctionTestDummy {};
 
-    template<typename T> char function_test(T *);
-    template<typename T> char function_test(FunctionTestDummy);
-    template<typename T> int  function_test(...);
+    template<typename T>
+    char function_test(T *);
+    template<typename T>
+    char function_test(FunctionTestDummy);
+    template<typename T>
+    int function_test(...);
 
-    template<typename T> T                 &function_source(int);
-    template<typename T> FunctionTestDummy  function_source(...);
+    template<typename T>
+    T &function_source(int);
+    template<typename T>
+    FunctionTestDummy function_source(...);
 
-    template<typename T, bool = IsClass<T> ||
-                                IsUnion<T> ||
-                                IsVoid<T> ||
-                                IsReference<T> ||
-                                IsNullPointer<T>>
-    constexpr bool IsFunctionBase
-        = sizeof(function_test<T>(function_source<T>(0))) == 1;
+    template<
+        typename T, bool =
+            IsClass<T> || IsUnion<T> || IsVoid<T> || IsReference<T> ||
+            IsNullPointer<T>
+    >
+    constexpr bool IsFunctionBase =
+        sizeof(function_test<T>(function_source<T>(0))) == 1;
 
-    template<typename T> constexpr bool IsFunctionBase<T, true> = false;
+    template<typename T>
+    constexpr bool IsFunctionBase<T, true> = false;
 } /* namespace detail */
 
 template<typename T>
@@ -212,7 +258,8 @@ constexpr bool IsCompound = !IsFundamental<T>;
 /* is pointer to member */
 
 namespace detail {
-    template<typename> constexpr bool IsMemberPointerBase = false;
+    template<typename>
+    constexpr bool IsMemberPointerBase = false;
 
     template<typename T, typename U>
     constexpr bool IsMemberPointerBase<T U::*> = true;
@@ -224,7 +271,8 @@ constexpr bool IsMemberPointer = detail::IsMemberPointerBase<RemoveCv<T>>;
 /* is pointer to member object */
 
 namespace detail {
-    template<typename> constexpr bool IsMemberObjectPointerBase = false;
+    template<typename>
+    constexpr bool IsMemberObjectPointerBase = false;
 
     template<typename T, typename U>
     constexpr bool IsMemberObjectPointerBase<T U::*> = !IsFunction<T>;
@@ -236,7 +284,8 @@ constexpr bool IsMemberObjectPointer = detail::IsMemberObjectPointerBase<RemoveC
 /* is pointer to member function */
 
 namespace detail {
-    template<typename> constexpr bool IsMemberFunctionPointerBase = false;
+    template<typename>
+    constexpr bool IsMemberFunctionPointerBase = false;
 
     template<typename T, typename U>
     constexpr bool IsMemberFunctionPointerBase<T U::*> = IsFunction<T>;
@@ -252,13 +301,15 @@ constexpr bool IsObject = !IsFunction<T> && !IsVoid<T> && !IsReference<T>;
 
 /* is scalar */
 
-template<typename T> constexpr bool IsScalar
-    = IsMemberPointer<T> || IsPointer<T> || IsEnum<T> ||
-      IsNullPointer  <T> || IsArithmetic<T>;
+template<typename T>
+constexpr bool IsScalar =
+    IsMemberPointer<T> || IsPointer<T> || IsEnum<T> ||
+    IsNullPointer  <T> || IsArithmetic<T>;
 
 /* is abstract */
 
-template<typename T> constexpr bool IsAbstract = __is_abstract(T);
+template<typename T>
+constexpr bool IsAbstract = __is_abstract(T);
 
 /* is const */
 
@@ -272,20 +323,24 @@ constexpr bool IsVolatile = IsSame<T, T volatile>;
 
 /* is empty */
 
-template<typename T> constexpr bool IsEmpty = __is_empty(T);
+template<typename T>
+constexpr bool IsEmpty = __is_empty(T);
 
 /* is POD */
 
-template<typename T> constexpr bool IsPod = __is_pod(T);
+template<typename T>
+constexpr bool IsPod = __is_pod(T);
 
 /* is polymorphic */
 
-template<typename T> constexpr bool IsPolymorphic = __is_polymorphic(T);
+template<typename T>
+constexpr bool IsPolymorphic = __is_polymorphic(T);
 
 /* is signed */
 
 namespace detail {
-    template<typename T> constexpr bool IsSignedCore = T(-1) < T(0);
+    template<typename T>
+    constexpr bool IsSignedCore = T(-1) < T(0);
 
     template<typename T, bool = IsArithmetic<T>>
     constexpr bool IsSignedBase = false;
@@ -300,7 +355,8 @@ constexpr bool IsSigned = detail::IsSignedBase<T>;
 /* is unsigned */
 
 namespace detail {
-    template<typename T> constexpr bool IsUnsignedCore = T(0) < T(-1);
+    template<typename T>
+    constexpr bool IsUnsignedCore = T(0) < T(-1);
 
     template<typename T, bool = IsArithmetic<T>>
     constexpr bool IsUnsignedBase = false;
@@ -329,7 +385,8 @@ constexpr bool IsTriviallyCopyable = IsScalar<RemoveAllExtents<T>>;
 
 /* is trivial */
 
-template<typename T> constexpr bool IsTrivial = __is_trivial(T);
+template<typename T>
+constexpr bool IsTrivial = __is_trivial(T);
 
 /* has virtual destructor */
 
@@ -341,21 +398,26 @@ constexpr bool HasVirtualDestructor = __has_virtual_destructor(T);
 namespace detail {
 #define OSTD_MOVE(v) static_cast<RemoveReference<decltype(v)> &&>(v)
 
-    template<typename, typename T> struct Select2nd { using Type = T; };
+    template<typename, typename T>
+    struct Select2nd { using Type = T; };
+
     struct Any { Any(...); };
 
-    template<typename T, typename ...A> typename Select2nd<
+    template<typename T, typename ...A>
+    typename Select2nd<
         decltype(OSTD_MOVE(T(declval_in<A>()...))), True
     >::Type is_ctible_test(T &&, A &&...);
 
 #undef OSTD_MOVE
 
-    template<typename ...A> False is_ctible_test(Any, A &&...);
+    template<typename ...A>
+    False is_ctible_test(Any, A &&...);
 
     template<bool, typename T, typename ...A>
-    constexpr bool CtibleCore = CommonTypeBase<
-        decltype(is_ctible_test(declval_in<T>(), declval_in<A>()...))
-    >::Type::value;
+    constexpr bool CtibleCore =
+        CommonTypeBase<
+            decltype(is_ctible_test(declval_in<T>(), declval_in<A>()...))
+        >::Type::value;
 
     /* function types are not constructible */
     template<typename R, typename ...A1, typename ...A2>
@@ -384,27 +446,27 @@ namespace detail {
 
     /* treat scalars and refs separately */
     template<bool, typename T, typename ...A>
-    constexpr bool CtibleVoidCheck = CtibleCore<
-        (IsScalar<T> || IsReference<T>), T, A...
-    >;
+    constexpr bool CtibleVoidCheck =
+        CtibleCore<(IsScalar<T> || IsReference<T>), T, A...>;
 
     /* if any of T or A is void, IsConstructible should be false */
     template<typename T, typename ...A>
     constexpr bool CtibleVoidCheck<true, T, A...> = false;
 
-    template<typename ...A> constexpr bool CtibleContainsVoid = false;
+    template<typename ...A>
+    constexpr bool CtibleContainsVoid = false;
 
-    template<> constexpr bool CtibleContainsVoid<> = false;
+    template<>
+    constexpr bool CtibleContainsVoid<> = false;
 
     template<typename T, typename ...A>
-    constexpr bool CtibleContainsVoid<T, A...>
-        = IsVoid<T> || CtibleContainsVoid<A...>;
+    constexpr bool CtibleContainsVoid<T, A...> =
+        IsVoid<T> || CtibleContainsVoid<A...>;
 
     /* entry point */
     template<typename T, typename ...A>
-    constexpr bool Ctible = CtibleVoidCheck<
-        CtibleContainsVoid<T, A...> || IsAbstract<T>, T, A...
-    >;
+    constexpr bool Ctible =
+        CtibleVoidCheck<CtibleContainsVoid<T, A...> || IsAbstract<T>, T, A...>;
 
     /* array types are default constructible if their element type is */
     template<typename T, Size N>
@@ -430,16 +492,14 @@ constexpr bool IsDefaultConstructible = IsConstructible<T>;
 /* is copy constructible */
 
 template<typename T>
-constexpr bool IsCopyConstructible = IsConstructible<T,
-    AddLvalueReference<AddConst<T>>
->;
+constexpr bool IsCopyConstructible =
+    IsConstructible<T, AddLvalueReference<AddConst<T>>>;
 
 /* is move constructible */
 
 template<typename T>
-constexpr bool IsMoveConstructible = IsConstructible<T,
-    AddRvalueReference<T>
->;
+constexpr bool IsMoveConstructible =
+    IsConstructible<T, AddRvalueReference<T>>;
 
 /* is nothrow constructible */
 
@@ -448,24 +508,25 @@ namespace detail {
     constexpr bool NothrowCtibleCore = false;
 
     template<typename T, typename ...A>
-    constexpr bool NothrowCtibleCore<true, false, T, A...>
-        = noexcept(T(declval_in<A>()...));
+    constexpr bool NothrowCtibleCore<true, false, T, A...> =
+        noexcept(T(declval_in<A>()...));
 
-    template<typename T> void implicit_conv_to(T) noexcept {}
+    template<typename T>
+    void implicit_conv_to(T) noexcept {}
 
     template<typename T, typename A>
-    constexpr bool NothrowCtibleCore<true, true, T, A>
-        = noexcept(ostd::detail::implicit_conv_to<T>(declval_in<A>()));
+    constexpr bool NothrowCtibleCore<true, true, T, A> =
+        noexcept(ostd::detail::implicit_conv_to<T>(declval_in<A>()));
 
     template<typename T, bool R, typename ...A>
     constexpr bool NothrowCtibleCore<false, R, T, A...> = false;
 } /* namespace detail */
 
-template<typename T, typename ...A> constexpr bool IsNothrowConstructible
-    = detail::NothrowCtibleCore<IsConstructible<T, A...>, IsReference<T>, T, A...>;
+template<typename T, typename ...A> constexpr bool IsNothrowConstructible =
+    detail::NothrowCtibleCore<IsConstructible<T, A...>, IsReference<T>, T, A...>;
 
-template<typename T, Size N> constexpr bool IsNothrowConstructible<T[N]>
-    = detail::NothrowCtibleCore<IsConstructible<T>, IsReference<T>, T>;
+template<typename T, Size N> constexpr bool IsNothrowConstructible<T[N]> =
+    detail::NothrowCtibleCore<IsConstructible<T>, IsReference<T>, T>;
 
 /* is nothrow default constructible */
 
@@ -475,25 +536,25 @@ constexpr bool IsNothrowDefaultConstructible = IsNothrowConstructible<T>;
 /* is nothrow copy constructible */
 
 template<typename T>
-constexpr bool IsNothrowCopyConstructible = IsNothrowConstructible<T,
-    AddLvalueReference<AddConst<T>>
->;
+constexpr bool IsNothrowCopyConstructible =
+    IsNothrowConstructible<T, AddLvalueReference<AddConst<T>>>;
 
 /* is nothrow move constructible */
 
 template<typename T>
-constexpr bool IsNothrowMoveConstructible = IsNothrowConstructible<T,
-    AddRvalueReference<T>
->;
+constexpr bool IsNothrowMoveConstructible =
+    IsNothrowConstructible<T, AddRvalueReference<T>>;
 
 /* is assignable */
 
 namespace detail {
-    template<typename T, typename U> typename detail::Select2nd<
+    template<typename T, typename U>
+    typename detail::Select2nd<
         decltype((declval_in<T>() = declval_in<U>())), True
     >::Type assign_test(T &&, U &&);
 
-    template<typename T> False assign_test(Any, T &&);
+    template<typename T>
+    False assign_test(Any, T &&);
 
     template<typename T, typename U, bool = IsVoid<T> || IsVoid<U>>
     constexpr bool IsAssignableBase = CommonTypeBase<
@@ -510,18 +571,14 @@ constexpr bool IsAssignable = detail::IsAssignableBase<T, U>;
 /* is copy assignable */
 
 template<typename T>
-constexpr bool IsCopyAssignable = IsAssignable<
-    AddLvalueReference<T>,
-    AddLvalueReference<AddConst<T>>
->;
+constexpr bool IsCopyAssignable =
+    IsAssignable<AddLvalueReference<T>, AddLvalueReference<AddConst<T>>>;
 
 /* is move assignable */
 
 template<typename T>
-constexpr bool IsMoveAssignable = IsAssignable<
-    AddLvalueReference<T>,
-    AddRvalueReference<T> const
->;
+constexpr bool IsMoveAssignable =
+    IsAssignable<AddLvalueReference<T>, AddRvalueReference<T> const>;
 
 /* is nothrow assignable */
 
@@ -533,63 +590,69 @@ namespace detail {
     constexpr bool NothrowAssignableCore<false, T, A> = false;
 
     template<typename T, typename A>
-    constexpr bool NothrowAssignableCore<true, T, A>
-        = noexcept(declval_in<T>() = declval_in<A>());
+    constexpr bool NothrowAssignableCore<true, T, A> =
+        noexcept(declval_in<T>() = declval_in<A>());
 }
 
-template<typename T, typename A> constexpr bool IsNothrowAssignable
-    = detail::NothrowAssignableCore<IsAssignable<T, A>, T, A>;
+template<typename T, typename A> constexpr bool IsNothrowAssignable =
+    detail::NothrowAssignableCore<IsAssignable<T, A>, T, A>;
 
 /* is nothrow copy assignable */
 
 template<typename T>
-constexpr bool IsNothrowCopyAssignable = IsNothrowAssignable<
-    AddLvalueReference<T>, AddLvalueReference<AddConst<T>>
->;
+constexpr bool IsNothrowCopyAssignable =
+    IsNothrowAssignable<AddLvalueReference<T>, AddLvalueReference<AddConst<T>>>;
 
 /* is nothrow move assignable */
 
 template<typename T>
-constexpr bool IsNothrowMoveAssignable = IsNothrowAssignable<
-    AddLvalueReference<T>, AddRvalueReference<T>
->;
+constexpr bool IsNothrowMoveAssignable =
+    IsNothrowAssignable<AddLvalueReference<T>, AddRvalueReference<T>>;
 
 /* is destructible */
 
 namespace detail {
-    template<typename> struct IsDtibleApply { using Type = int; };
+    template<typename>
+    struct IsDtibleApply { using Type = int; };
 
     template<typename T> struct IsDestructorWellformed {
-        template<typename TT> static char test(typename IsDtibleApply<
+        template<typename TT>
+        static char test(typename IsDtibleApply<
             decltype(detail::declval_in<TT &>().~TT())
         >::Type);
 
-        template<typename TT> static int test(...);
+        template<typename TT>
+        static int test(...);
 
         static constexpr bool value = (sizeof(test<T>(12)) == sizeof(char));
     };
 
-    template<typename, bool> constexpr bool DtibleImpl = false;
+    template<typename, bool>
+    constexpr bool DtibleImpl = false;
 
     template<typename T>
-    constexpr bool DtibleImpl<T, false>
-        = IsDestructorWellformed<RemoveAllExtents<T>>::value;
+    constexpr bool DtibleImpl<T, false> =
+        IsDestructorWellformed<RemoveAllExtents<T>>::value;
 
     template<typename T>
     constexpr bool DtibleImpl<T, true> = true;
 
-    template<typename T, bool> constexpr bool DtibleFalse = false;
+    template<typename T, bool>
+    constexpr bool DtibleFalse = false;
 
-    template<typename T> constexpr bool DtibleFalse<T, false>
-        = DtibleImpl<T, IsReference<T>>;
+    template<typename T>
+    constexpr bool DtibleFalse<T, false> = DtibleImpl<T, IsReference<T>>;
 
-    template<typename T> constexpr bool DtibleFalse<T, true> = false;
+    template<typename T>
+    constexpr bool DtibleFalse<T, true> = false;
 
     template<typename T>
     constexpr bool IsDestructibleBase = detail::DtibleFalse<T, IsFunction<T>>;
 
-    template<typename T> constexpr bool IsDestructibleBase<T[] > = false;
-    template<          > constexpr bool IsDestructibleBase<void> = false;
+    template<typename T>
+    constexpr bool IsDestructibleBase<T[]> = false;
+    template<>
+    constexpr bool IsDestructibleBase<void> = false;
 } /* namespace detail */
 
 template<typename T>
@@ -598,19 +661,21 @@ constexpr bool IsDestructible = detail::IsDestructibleBase<T>;
 /* is nothrow destructible */
 
 namespace detail {
-    template<bool, typename> constexpr bool NothrowDtibleCore = false;
+    template<bool, typename>
+    constexpr bool NothrowDtibleCore = false;
 
-    template<typename T> constexpr bool NothrowDtibleCore<false, T> = false;
+    template<typename T>
+    constexpr bool NothrowDtibleCore<false, T> = false;
 
-    template<typename T> constexpr bool NothrowDtibleCore<true, T>
-        = noexcept(declval_in<T>().~T());
+    template<typename T>
+    constexpr bool NothrowDtibleCore<true, T> = noexcept(declval_in<T>().~T());
 }
 
-template<typename T> constexpr bool IsNothrowDestructible
-    = detail::NothrowDtibleCore<IsDestructible<T>, T>;
+template<typename T>
+constexpr bool IsNothrowDestructible = detail::NothrowDtibleCore<IsDestructible<T>, T>;
 
-template<typename T, Size N> constexpr bool IsNothrowDestructible<T[N]>
-    = IsNothrowDestructible<T>;
+template<typename T, Size N>
+constexpr bool IsNothrowDestructible<T[N]> = IsNothrowDestructible<T>;
 
 /* is trivially constructible */
 
@@ -619,40 +684,38 @@ namespace detail {
     constexpr bool IsTriviallyConstructibleBase = false;
 
     template<typename T>
-    constexpr bool IsTriviallyConstructibleBase<T>
-        = __has_trivial_constructor(T);
+    constexpr bool IsTriviallyConstructibleBase<T> =
+        __has_trivial_constructor(T);
 
     template<typename T>
-    constexpr bool IsTriviallyConstructibleBase<T, T &>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyConstructibleBase<T, T &> = __has_trivial_copy(T);
 
     template<typename T>
-    constexpr bool IsTriviallyConstructibleBase<T, T const &>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyConstructibleBase<T, T const &> =
+        __has_trivial_copy(T);
 
     template<typename T>
-    constexpr bool IsTriviallyConstructibleBase<T, T &&>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyConstructibleBase<T, T &&> = __has_trivial_copy(T);
 } /* namespace detail */
 
 template<typename T, typename ...A>
-constexpr bool IsTriviallyConstructible
-    = detail::IsTriviallyConstructibleBase<T, A...>;
+constexpr bool IsTriviallyConstructible =
+    detail::IsTriviallyConstructibleBase<T, A...>;
 
 /* is trivially default constructible */
 
-template<typename T> constexpr bool IsTriviallyDefaultConstructible
-    = IsTriviallyConstructible<T>;
+template<typename T> constexpr bool IsTriviallyDefaultConstructible =
+    IsTriviallyConstructible<T>;
 
 /* is trivially copy constructible */
 
-template<typename T> constexpr bool IsTriviallyCopyConstructible
-    = IsTriviallyConstructible<T, AddLvalueReference<T const>>;
+template<typename T> constexpr bool IsTriviallyCopyConstructible =
+    IsTriviallyConstructible<T, AddLvalueReference<T const>>;
 
 /* is trivially move constructible */
 
-template<typename T> constexpr bool IsTriviallyMoveConstructible
-    = IsTriviallyConstructible<T, AddRvalueReference<T>>;
+template<typename T> constexpr bool IsTriviallyMoveConstructible =
+    IsTriviallyConstructible<T, AddRvalueReference<T>>;
 
 /* is trivially assignable */
 
@@ -661,35 +724,32 @@ namespace detail {
     constexpr bool IsTriviallyAssignableBase = false;
 
     template<typename T>
-    constexpr bool IsTriviallyAssignableBase<T>
-        = __has_trivial_assign(T);
+    constexpr bool IsTriviallyAssignableBase<T> = __has_trivial_assign(T);
 
     template<typename T>
-    constexpr bool IsTriviallyAssignableBase<T, T &>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyAssignableBase<T, T &> = __has_trivial_copy(T);
 
     template<typename T>
-    constexpr bool IsTriviallyAssignableBase<T, T const &>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyAssignableBase<T, T const &> = __has_trivial_copy(T);
 
     template<typename T>
-    constexpr bool IsTriviallyAssignableBase<T, T &&>
-        = __has_trivial_copy(T);
+    constexpr bool IsTriviallyAssignableBase<T, T &&> = __has_trivial_copy(T);
 } /* namespace detail */
 
 template<typename T, typename ...A>
-constexpr bool IsTriviallyAssignable
-    = detail::IsTriviallyAssignableBase<T>;
+constexpr bool IsTriviallyAssignable = detail::IsTriviallyAssignableBase<T>;
 
 /* is trivially copy assignable */
 
-template<typename T> constexpr bool IsTriviallyCopyAssignable
-    = IsTriviallyAssignable<T, AddLvalueReference<T const>>;
+template<typename T>
+constexpr bool IsTriviallyCopyAssignable =
+    IsTriviallyAssignable<T, AddLvalueReference<T const>>;
 
 /* is trivially move assignable */
 
-template<typename T> constexpr bool IsTriviallyMoveAssignable
-    = IsTriviallyAssignable<T, AddRvalueReference<T>>;
+template<typename T>
+constexpr bool IsTriviallyMoveAssignable =
+    IsTriviallyAssignable<T, AddRvalueReference<T>>;
 
 /* is trivially destructible */
 
@@ -704,33 +764,39 @@ constexpr bool IsBaseOf = __is_base_of(B, D);
 /* is convertible */
 
 namespace detail {
-    template<typename F, typename T, bool = IsVoid<F>
-        || IsFunction<T> || IsArray<T>
-    > struct IsConvertibleBase {
+    template<
+        typename F, typename T, bool =
+            IsVoid<F> || IsFunction<T> || IsArray<T>
+    >
+    struct IsConvertibleBase {
         static constexpr bool value = IsVoid<T>;
     };
 
     template<typename F, typename T>
     struct IsConvertibleBase<F, T, false> {
-        template<typename TT> static void test_f(TT);
+        template<typename TT>
+        static void test_f(TT);
 
         template<typename FF, typename TT,
             typename = decltype(test_f<TT>(declval_in<FF>()))
-        > static True test(int);
+        >
+        static True test(int);
 
-        template<typename, typename> static False test(...);
+        template<typename, typename>
+        static False test(...);
 
         static constexpr bool value = decltype(test<F, T>(0))::value;
     };
 }
 
-template<typename F, typename T> constexpr bool IsConvertible
-    = detail::IsConvertibleBase<F, T>::value;
+template<typename F, typename T>
+constexpr bool IsConvertible = detail::IsConvertibleBase<F, T>::value;
 
 /* extent */
 
 namespace detail {
-    template<typename, uint> constexpr Size ExtentBase = 0;
+    template<typename, uint>
+    constexpr Size ExtentBase = 0;
 
     template<typename T>
     constexpr Size ExtentBase<T[], 0> = 0;
@@ -751,7 +817,8 @@ constexpr Size Extent = detail::ExtentBase<T, I>;
 /* rank */
 
 namespace detail {
-    template<typename> constexpr Size RankBase = 0;
+    template<typename>
+    constexpr Size RankBase = 0;
 
     template<typename T>
     constexpr Size RankBase<T[]> = detail::RankBase<T> + 1;
@@ -760,18 +827,19 @@ namespace detail {
     constexpr Size RankBase<T[N]> = detail::RankBase<T> + 1;
 }
 
-template<typename T> constexpr Size Rank = detail::RankBase<T>;
+template<typename T>
+constexpr Size Rank = detail::RankBase<T>;
 
 /* remove const, volatile, cv */
 
 namespace detail {
     template<typename T>
-    struct RemoveConstBase          { using Type = T; };
+    struct RemoveConstBase { using Type = T; };
     template<typename T>
     struct RemoveConstBase<T const> { using Type = T; };
 
     template<typename T>
-    struct RemoveVolatileBase             { using Type = T; };
+    struct RemoveVolatileBase { using Type = T; };
     template<typename T>
     struct RemoveVolatileBase<T volatile> { using Type = T; };
 }
@@ -794,22 +862,26 @@ namespace detail {
     template<typename T, bool = IsReference<T> || IsFunction<T> || IsConst<T>>
     struct AddConstCore { using Type = T; };
 
-    template<typename T> struct AddConstCore<T, false> {
+    template<typename T>
+    struct AddConstCore<T, false> {
         using Type = T const;
     };
 
-    template<typename T> struct AddConstBase {
+    template<typename T>
+    struct AddConstBase {
         using Type = typename AddConstCore<T>::Type;
     };
 
     template<typename T, bool = IsReference<T> || IsFunction<T> || IsVolatile<T>>
     struct AddVolatileCore { using Type = T; };
 
-    template<typename T> struct AddVolatileCore<T, false> {
+    template<typename T>
+    struct AddVolatileCore<T, false> {
         using Type = T volatile;
     };
 
-    template<typename T> struct AddVolatileBase {
+    template<typename T>
+    struct AddVolatileBase {
         using Type = typename AddVolatileCore<T>::Type;
     };
 }
@@ -831,9 +903,9 @@ using AddCv = typename detail::AddCvBase<T>::Type;
 
 namespace detail {
     template<typename T>
-    struct RemoveReferenceBase       { using Type = T; };
+    struct RemoveReferenceBase { using Type = T; };
     template<typename T>
-    struct RemoveReferenceBase<T &>  { using Type = T; };
+    struct RemoveReferenceBase<T &> { using Type = T; };
     template<typename T>
     struct RemoveReferenceBase<T &&> { using Type = T; };
 }
@@ -842,13 +914,13 @@ namespace detail {
 
 namespace detail {
     template<typename T>
-    struct RemovePointerBase                     { using Type = T; };
+    struct RemovePointerBase { using Type = T; };
     template<typename T>
-    struct RemovePointerBase<T *               > { using Type = T; };
+    struct RemovePointerBase<T *> { using Type = T; };
     template<typename T>
-    struct RemovePointerBase<T * const         > { using Type = T; };
+    struct RemovePointerBase<T * const> { using Type = T; };
     template<typename T>
-    struct RemovePointerBase<T * volatile      > { using Type = T; };
+    struct RemovePointerBase<T * volatile> { using Type = T; };
     template<typename T>
     struct RemovePointerBase<T * const volatile> { using Type = T; };
 }
@@ -859,7 +931,8 @@ using RemovePointer = typename detail::RemovePointerBase<T>::Type;
 /* add pointer */
 
 namespace detail {
-    template<typename T> struct AddPointerBase {
+    template<typename T>
+    struct AddPointerBase {
         using Type = RemoveReference<T> *;
     };
 }
@@ -870,18 +943,24 @@ using AddPointer = typename detail::AddPointerBase<T>::Type;
 /* add lvalue reference */
 
 namespace detail {
-    template<typename T> struct AddLr      { using Type = T &; };
-    template<typename T> struct AddLr<T &> { using Type = T &; };
-    template<> struct AddLr<void> {
+    template<typename T>
+    struct AddLr { using Type = T &; };
+    template<typename T>
+    struct AddLr<T &> { using Type = T &; };
+    template<>
+    struct AddLr<void> {
         using Type = void;
     };
-    template<> struct AddLr<void const> {
+    template<>
+    struct AddLr<void const> {
         using Type = void const;
     };
-    template<> struct AddLr<void volatile> {
+    template<>
+    struct AddLr<void volatile> {
         using Type = void volatile;
     };
-    template<> struct AddLr<void const volatile> {
+    template<>
+    struct AddLr<void const volatile> {
         using Type = void const volatile;
     };
 }
@@ -889,17 +968,22 @@ namespace detail {
 /* add rvalue reference */
 
 namespace detail {
-    template<typename T> struct AddRr { using Type = T &&; };
-    template<> struct AddRr<void> {
+    template<typename T>
+    struct AddRr { using Type = T &&; };
+    template<>
+    struct AddRr<void> {
         using Type = void;
     };
-    template<> struct AddRr<void const> {
+    template<>
+    struct AddRr<void const> {
         using Type = void const;
     };
-    template<> struct AddRr<void volatile> {
+    template<>
+    struct AddRr<void volatile> {
         using Type = void volatile;
     };
-    template<> struct AddRr<void const volatile> {
+    template<>
+    struct AddRr<void const volatile> {
         using Type = void const volatile;
     };
 }
@@ -908,9 +992,9 @@ namespace detail {
 
 namespace detail {
     template<typename T>
-    struct RemoveExtentBase       { using Type = T; };
+    struct RemoveExtentBase { using Type = T; };
     template<typename T>
-    struct RemoveExtentBase<T[ ]> { using Type = T; };
+    struct RemoveExtentBase<T[]> { using Type = T; };
     template<typename T, Size N>
     struct RemoveExtentBase<T[N]> { using Type = T; };
 }
@@ -921,13 +1005,16 @@ using RemoveExtent = typename detail::RemoveExtentBase<T>::Type;
 /* remove all extents */
 
 namespace detail {
-    template<typename T> struct RemoveAllExtentsBase { using Type = T; };
+    template<typename T>
+    struct RemoveAllExtentsBase { using Type = T; };
 
-    template<typename T> struct RemoveAllExtentsBase<T[]> {
+    template<typename T>
+    struct RemoveAllExtentsBase<T[]> {
         using Type = RemoveAllExtentsBase<T>;
     };
 
-    template<typename T, Size N> struct RemoveAllExtentsBase<T[N]> {
+    template<typename T, Size N>
+    struct RemoveAllExtentsBase<T[N]> {
         using Type = RemoveAllExtentsBase<T>;
     };
 }
@@ -939,7 +1026,8 @@ namespace detail {
  */
 
 namespace detail {
-    template<typename T, typename U> struct TypeList {
+    template<typename T, typename U>
+    struct TypeList {
         using First = T;
         using Rest = U;
     };
@@ -952,17 +1040,27 @@ namespace detail {
         ~TlNat() = delete;
     };
 
-    using Stypes = TypeList<sbyte,
-                   TypeList<short,
-                   TypeList<int,
-                   TypeList<long,
-                   TypeList<llong, TlNat>>>>>;
+    using Stypes =
+        TypeList<
+            sbyte, TypeList<
+                short, TypeList<
+                    int, TypeList<
+                        long, TypeList<llong, TlNat>
+                    >
+                >
+            >
+        >;
 
-    using Utypes = TypeList<byte,
-                   TypeList<ushort,
-                   TypeList<uint,
-                   TypeList<ulong,
-                   TypeList<ullong, TlNat>>>>>;
+    using Utypes =
+        TypeList<
+            byte, TypeList<
+                ushort, TypeList<
+                    uint, TypeList<
+                        ulong, TypeList<ullong, TlNat>
+                    >
+                >
+            >
+        >;
 
     template<typename T, Size N, bool = (N <= sizeof(typename T::First))>
     struct TypeFindFirst;
@@ -977,7 +1075,8 @@ namespace detail {
         using Type = typename TypeFindFirst<U, N>::Type;
     };
 
-    template<typename T, typename U,
+    template<
+        typename T, typename U,
         bool = IsConst<RemoveReference<T>>,
         bool = IsVolatile<RemoveReference<T>>
     > struct ApplyCv {
@@ -1030,39 +1129,63 @@ namespace detail {
         using Type = typename TypeFindFirst<Utypes, sizeof(T)>::Type;
     };
 
-    template<> struct MakeSignedCore<bool  , true> {};
-    template<> struct MakeSignedCore<short , true> { using Type = short; };
-    template<> struct MakeSignedCore<int   , true> { using Type = int; };
-    template<> struct MakeSignedCore<long  , true> { using Type = long; };
+    template<>
+    struct MakeSignedCore<bool, true> {};
+    template<>
+    struct MakeSignedCore<short, true> { using Type = short; };
+    template<>
+    struct MakeSignedCore<int, true> { using Type = int; };
+    template<>
+    struct MakeSignedCore<long, true> { using Type = long; };
 
-    template<> struct MakeSignedCore<sbyte , true> { using Type = sbyte; };
-    template<> struct MakeSignedCore<byte  , true> { using Type = sbyte; };
-    template<> struct MakeSignedCore<ushort, true> { using Type = short; };
-    template<> struct MakeSignedCore<uint  , true> { using Type = int;   };
-    template<> struct MakeSignedCore<ulong , true> { using Type = long;  };
-    template<> struct MakeSignedCore<llong , true> { using Type = llong; };
-    template<> struct MakeSignedCore<ullong, true> { using Type = llong; };
+    template<>
+    struct MakeSignedCore<sbyte, true> { using Type = sbyte; };
+    template<>
+    struct MakeSignedCore<byte, true> { using Type = sbyte; };
+    template<>
+    struct MakeSignedCore<ushort, true> { using Type = short; };
+    template<>
+    struct MakeSignedCore<uint, true> { using Type = int; };
+    template<>
+    struct MakeSignedCore<ulong, true> { using Type = long; };
+    template<>
+    struct MakeSignedCore<llong, true> { using Type = llong; };
+    template<>
+    struct MakeSignedCore<ullong, true> { using Type = llong; };
 
-    template<> struct MakeUnsignedCore<bool  , true> {};
-    template<> struct MakeUnsignedCore<short , true> { using Type = ushort; };
-    template<> struct MakeUnsignedCore<int   , true> { using Type = uint;   };
-    template<> struct MakeUnsignedCore<long  , true> { using Type = ulong;  };
+    template<>
+    struct MakeUnsignedCore<bool, true> {};
+    template<>
+    struct MakeUnsignedCore<short, true> { using Type = ushort; };
+    template<>
+    struct MakeUnsignedCore<int, true> { using Type = uint; };
+    template<>
+    struct MakeUnsignedCore<long, true> { using Type = ulong; };
 
-    template<> struct MakeUnsignedCore<sbyte , true> { using Type = byte;   };
-    template<> struct MakeUnsignedCore<byte  , true> { using Type = byte;   };
-    template<> struct MakeUnsignedCore<ushort, true> { using Type = ushort; };
-    template<> struct MakeUnsignedCore<uint  , true> { using Type = uint;   };
-    template<> struct MakeUnsignedCore<ulong , true> { using Type = ulong;  };
-    template<> struct MakeUnsignedCore<llong , true> { using Type = ullong; };
-    template<> struct MakeUnsignedCore<ullong, true> { using Type = ullong; };
+    template<>
+    struct MakeUnsignedCore<sbyte, true> { using Type = byte; };
+    template<>
+    struct MakeUnsignedCore<byte, true> { using Type = byte; };
+    template<>
+    struct MakeUnsignedCore<ushort, true> { using Type = ushort; };
+    template<>
+    struct MakeUnsignedCore<uint, true> { using Type = uint; };
+    template<>
+    struct MakeUnsignedCore<ulong, true> { using Type = ulong; };
+    template<>
+    struct MakeUnsignedCore<llong, true> { using Type = ullong; };
+    template<>
+    struct MakeUnsignedCore<ullong, true> { using Type = ullong; };
 
-    template<typename T> struct MakeSignedBase {
+    template<typename T>
+    struct MakeSignedBase {
         using Type = typename ApplyCv<T,
             typename MakeSignedCore<RemoveCv<T>>::Type
         >::Type;
     };
 
-    template<typename T> struct MakeUnsignedBase {
+    template<typename T>
+    struct MakeUnsignedBase {
         using Type = typename ApplyCv<T,
             typename MakeUnsignedCore<RemoveCv<T>>::Type
         >::Type;
@@ -1097,28 +1220,32 @@ namespace detail {
 #define OSTD_FWD(T, _v) static_cast<T &&>(_v)
     template<typename F, typename ...A>
     inline auto rof_invoke(F &&f, A &&...args) ->
-      decltype(OSTD_FWD(F, f)(OSTD_FWD(A, args)...)) {
+        decltype(OSTD_FWD(F, f)(OSTD_FWD(A, args)...))
+    {
         return OSTD_FWD(F, f)(OSTD_FWD(A, args)...);
     }
     template<typename B, typename T, typename D>
     inline auto rof_invoke(T B::*pmd, D &&ref) ->
-      decltype(OSTD_FWD(D, ref).*pmd) {
+        decltype(OSTD_FWD(D, ref).*pmd)
+    {
         return OSTD_FWD(D, ref).*pmd;
     }
     template<typename PMD, typename P>
     inline auto rof_invoke(PMD &&pmd, P &&ptr) ->
-      decltype((*OSTD_FWD(P, ptr)).*OSTD_FWD(PMD, pmd)) {
+        decltype((*OSTD_FWD(P, ptr)).*OSTD_FWD(PMD, pmd))
+    {
         return (*OSTD_FWD(P, ptr)).*OSTD_FWD(PMD, pmd);
     }
     template<typename B, typename T, typename D, typename ...A>
     inline auto rof_invoke(T B::*pmf, D &&ref, A &&...args) ->
-      decltype((OSTD_FWD(D, ref).*pmf)(OSTD_FWD(A, args)...)) {
+        decltype((OSTD_FWD(D, ref).*pmf)(OSTD_FWD(A, args)...))
+    {
         return (OSTD_FWD(D, ref).*pmf)(OSTD_FWD(A, args)...);
     }
     template<typename PMF, typename P, typename ...A>
     inline auto rof_invoke(PMF &&pmf, P &&ptr, A &&...args) ->
-      decltype(((*OSTD_FWD(P, ptr)).*OSTD_FWD(PMF, pmf))
-          (OSTD_FWD(A, args)...)) {
+        decltype(((*OSTD_FWD(P, ptr)).*OSTD_FWD(PMF, pmf))(OSTD_FWD(A, args)...))
+    {
         return ((*OSTD_FWD(P, ptr)).*OSTD_FWD(PMF, pmf))
           (OSTD_FWD(A, args)...);
     }
@@ -1133,7 +1260,8 @@ namespace detail {
             detail::declval_in<A>()...));
     };
 
-    template<typename T> struct ResultOfBase: ResultOfCore<T> {};
+    template<typename T>
+    struct ResultOfBase: ResultOfCore<T> {};
 } /* namespace detail */
 
 template<typename T>
@@ -1142,9 +1270,11 @@ using ResultOf = typename detail::ResultOfBase<T>::Type;
 /* enable if */
 
 namespace detail {
-    template<bool B, typename T = void> struct EnableIfBase {};
+    template<bool B, typename T = void>
+    struct EnableIfBase {};
 
-    template<typename T> struct EnableIfBase<true, T> { using Type = T; };
+    template<typename T>
+    struct EnableIfBase<true, T> { using Type = T; };
 }
 
 template<bool B, typename T = void>
@@ -1158,7 +1288,8 @@ namespace detail {
     private:
         using U = RemoveReference<T>;
     public:
-        using Type = Conditional<IsArray<U>,
+        using Type = Conditional<
+            IsArray<U>,
             RemoveExtent<U> *,
             Conditional<IsFunction<U>, AddPointer<U>, RemoveCv<U>>
         >;
@@ -1171,15 +1302,19 @@ using Decay = typename detail::DecayBase<T>::Type;
 /* common type */
 
 namespace detail {
-    template<typename ...T> struct CommonTypeBase;
+    template<typename ...T>
+    struct CommonTypeBase;
 
-    template<typename T> struct CommonTypeBase<T> {
+    template<typename T>
+    struct CommonTypeBase<T> {
         using Type = Decay<T>;
     };
 
-    template<typename T, typename U> struct CommonTypeBase<T, U> {
-        using Type = Decay<decltype(true ? detail::declval_in<T>()
-            : detail::declval_in<U>())>;
+    template<typename T, typename U>
+    struct CommonTypeBase<T, U> {
+        using Type = Decay<decltype(
+            true ? detail::declval_in<T>(): detail::declval_in<U>()
+        )>;
     };
 
     template<typename T, typename U, typename ...V>
@@ -1196,14 +1331,16 @@ using CommonType = typename detail::CommonTypeBase<A...>::Type;
 /* aligned storage */
 
 namespace detail {
-    template<Size N> struct AlignedTest {
+    template<Size N>
+    struct AlignedTest {
         union Type {
             byte data[N];
             MaxAlign align;
         };
     };
 
-    template<Size N, Size A> struct AlignedStorageBase {
+    template<Size N, Size A>
+    struct AlignedStorageBase {
         struct Type {
             alignas(A) byte data[N];
         };
@@ -1212,23 +1349,26 @@ namespace detail {
 
 template<Size N, Size A
     = alignof(typename detail::AlignedTest<N>::Type)
-> using AlignedStorage = typename detail::AlignedStorageBase<N, A>::Type;
+>
+using AlignedStorage = typename detail::AlignedStorageBase<N, A>::Type;
 
 /* aligned union */
 
 namespace detail {
-    template<Size ...N> constexpr Size AlignMax = 0;
-    template<Size N> constexpr Size AlignMax<N> = N;
+    template<Size ...N>
+    constexpr Size AlignMax = 0;
+    template<Size N>
+    constexpr Size AlignMax<N> = N;
 
-    template<Size N1, Size N2> constexpr Size AlignMax<N1, N2>
-        = (N1 > N2) ? N1 : N2;
+    template<Size N1, Size N2>
+    constexpr Size AlignMax<N1, N2> = (N1 > N2) ? N1 : N2;
 
     template<Size N1, Size N2, Size ...N>
     constexpr Size AlignMax<N1, N2, N...> = AlignMax<AlignMax<N1, N2>, N...>;
 
-    template<Size N, typename ...T> struct AlignedUnionBase {
-        static constexpr Size alignment_value
-            = AlignMax<alignof(T)...>;
+    template<Size N, typename ...T>
+    struct AlignedUnionBase {
+        static constexpr Size alignment_value = AlignMax<alignof(T)...>;
 
         struct type {
             alignas(alignment_value) byte data[AlignMax<N, sizeof(T)...>];
@@ -1243,7 +1383,8 @@ using AlignedUnion = typename detail::AlignedUnionBase<N, T...>::Type;
 
 namespace detail {
     /* gotta wrap, in a struct otherwise clang ICEs... */
-    template<typename T> struct UnderlyingTypeBase {
+    template<typename T>
+    struct UnderlyingTypeBase {
         using Type = __underlying_type(T);
     };
 }
diff --git a/ostd/utility.hh b/ostd/utility.hh
index a46f6a9..be4ba50 100644
--- a/ostd/utility.hh
+++ b/ostd/utility.hh
@@ -43,7 +43,8 @@ inline T exchange(T &v, U &&nv) {
 
 /* declval */
 
-template<typename T> AddRvalueReference<T> declval();
+template<typename T>
+AddRvalueReference<T> declval();
 
 /* swap */
 
@@ -54,33 +55,38 @@ namespace detail {
     template<typename>
     False test_swap(...);
 
-    template<typename T> inline void swap_fb(T &a, T &b, EnableIf<
-        decltype(test_swap<T>(0))::value, bool
-    > = true) {
+    template<typename T>
+    inline void swap_fb(
+        T &a, T &b, EnableIf<decltype(test_swap<T>(0))::value, bool> = true
+    ) {
         a.swap(b);
     }
 
-    template<typename T> inline void swap_fb(T &a, T &b, EnableIf<
-        !decltype(test_swap<T>(0))::value, bool
-    > = true) {
+    template<typename T>
+    inline void swap_fb(
+        T &a, T &b, EnableIf<!decltype(test_swap<T>(0))::value, bool> = true
+    ) {
         T c(move(a));
         a = move(b);
         b = move(c);
     }
 }
 
-template<typename T> inline void swap(T &a, T &b) {
+template<typename T>
+inline void swap(T &a, T &b) {
    detail::swap_fb(a, b);
 }
 
-template<typename T, Size N> inline void swap(T (&a)[N], T (&b)[N]) {
+template<typename T, Size N>
+inline void swap(T (&a)[N], T (&b)[N]) {
     for (Size i = 0; i < N; ++i) {
         swap(a[i], b[i]);
     }
 }
 
 namespace detail {
-    template<typename T> inline void swap_adl(T &a, T &b) {
+    template<typename T>
+    inline void swap_adl(T &a, T &b) {
         using ostd::swap;
         swap(a, b);
     }
@@ -103,14 +109,16 @@ struct Pair {
 
     template<typename TT, typename UU>
     Pair(TT &&x, UU &&y):
-        first(forward<TT>(x)), second(forward<UU>(y)) {}
+        first(forward<TT>(x)), second(forward<UU>(y))
+    {}
 
     template<typename TT, typename UU>
     Pair(Pair<TT, UU> const &v): first(v.first), second(v.second) {}
 
     template<typename TT, typename UU>
     Pair(Pair<TT, UU> &&v):
-        first(move(v.first)), second(move(v.second)) {}
+        first(move(v.first)), second(move(v.second))
+    {}
 
     Pair &operator=(Pair const &v) {
         first = v.first;
@@ -144,7 +152,8 @@ struct Pair {
     }
 };
 
-template<typename T> struct ReferenceWrapper;
+template<typename T>
+struct ReferenceWrapper;
 
 namespace detail {
     template<typename T>
@@ -164,12 +173,13 @@ namespace detail {
 } /* namespace detail */
 
 template<typename T, typename U>
-inline Pair<typename detail::MakePairRet<T>::Type,
-            typename detail::MakePairRet<U>::Type
- > make_pair(T &&a, U &&b) {
-    return Pair<typename detail::MakePairRet<T>::Type,
-                typename detail::MakePairRet<U>::Type
-    >(forward<T>(a), forward<U>(b));;
+inline Pair<
+    typename detail::MakePairRet<T>::Type, typename detail::MakePairRet<U>::Type
+> make_pair(T &&a, U &&b) {
+    return Pair<
+        typename detail::MakePairRet<T>::Type,
+        typename detail::MakePairRet<U>::Type
+    >(forward<T>(a), forward<U>(b));
 }
 
 template<typename T, typename U>
@@ -222,9 +232,11 @@ struct TupleElementBase<1, Pair<T, U>> {
 };
 
 namespace detail {
-    template<Size> struct GetPair;
+    template<Size>
+    struct GetPair;
 
-    template<> struct GetPair<0> {
+    template<>
+    struct GetPair<0> {
         template<typename T, typename U>
         static T &get(Pair<T, U> &p) { return p.first; }
         template<typename T, typename U>
@@ -237,7 +249,8 @@ namespace detail {
         }
     };
 
-    template<> struct GetPair<1> {
+    template<>
+    struct GetPair<1> {
         template<typename T, typename U>
         static U &get(Pair<T, U> &p) { return p.second; }
         template<typename T, typename U>
@@ -275,7 +288,8 @@ namespace detail {
     template<typename T, typename U,
         bool = IsSame<RemoveCv<T>, RemoveCv<U>>,
         bool = IsEmpty<T>, bool = IsEmpty<U>
-    > constexpr Size CompressedPairSwitch = detail::Undefined<T>();
+    >
+    constexpr Size CompressedPairSwitch = detail::Undefined<T>();
 
     /* neither empty */
     template<typename T, typename U, bool Same>
@@ -306,8 +320,9 @@ namespace detail {
         U p_second;
 
         template<typename TT, typename UU>
-        CompressedPairBase(TT &&a, UU &&b): p_first(forward<TT>(a)),
-                                            p_second(forward<UU>(b)) {}
+        CompressedPairBase(TT &&a, UU &&b):
+            p_first(forward<TT>(a)), p_second(forward<UU>(b))
+        {}
 
         T &first() { return p_first; }
         T const &first() const { return p_first; }
@@ -326,8 +341,9 @@ namespace detail {
         U p_second;
 
         template<typename TT, typename UU>
-        CompressedPairBase(TT &&a, UU &&b): T(forward<TT>(a)),
-                                            p_second(forward<UU>(b)) {}
+        CompressedPairBase(TT &&a, UU &&b):
+            T(forward<TT>(a)), p_second(forward<UU>(b))
+        {}
 
         T &first() { return *this; }
         T const &first() const { return *this; }
@@ -345,8 +361,9 @@ namespace detail {
         T p_first;
 
         template<typename TT, typename UU>
-        CompressedPairBase(TT &&a, UU &&b): U(forward<UU>(b)),
-                                            p_first(forward<TT>(a)) {}
+        CompressedPairBase(TT &&a, UU &&b):
+            U(forward<UU>(b)), p_first(forward<TT>(a))
+        {}
 
         T &first() { return p_first; }
         T const &first() const { return p_first; }
@@ -362,8 +379,9 @@ namespace detail {
     template<typename T, typename U>
     struct CompressedPairBase<T, U, 3>: T, U {
         template<typename TT, typename UU>
-        CompressedPairBase(TT &&a, UU &&b): T(forward<TT>(a)),
-                                            U(forward<UU>(b)) {}
+        CompressedPairBase(TT &&a, UU &&b):
+            T(forward<TT>(a)), U(forward<UU>(b))
+        {}
 
         T &first() { return *this; }
         T const &first() const { return *this; }
@@ -379,8 +397,9 @@ namespace detail {
         using Base = CompressedPairBase<T, U>;
 
         template<typename TT, typename UU>
-        CompressedPair(TT &&a, UU &&b): Base(forward<TT>(a),
-                                             forward<UU>(b)) {}
+        CompressedPair(TT &&a, UU &&b):
+            Base(forward<TT>(a), forward<UU>(b))
+        {}
 
         T &first() { return Base::first(); }
         T const &first() const { return Base::first(); }
diff --git a/ostd/vector.hh b/ostd/vector.hh
index f873514..5fc7b53 100644
--- a/ostd/vector.hh
+++ b/ostd/vector.hh
@@ -26,7 +26,9 @@ class Vector {
     VecPair p_buf;
 
     void insert_base(Size idx, Size n) {
-        if (p_len + n > p_cap) reserve(p_len + n);
+        if (p_len + n > p_cap) {
+            reserve(p_len + n);
+        }
         p_len += n;
         for (Size i = p_len - 1; i > idx + n - 1; --i) {
             p_buf.first()[i] = move(p_buf.first()[i - n]);
@@ -34,10 +36,12 @@ class Vector {
     }
 
     template<typename R>
-    void ctor_from_range(R &range, EnableIf<
-        IsFiniteRandomAccessRange<R> && IsPod<T> &&
-        IsSame<T, RemoveCv<RangeValue<R>>>, bool
-    > = true) {
+    void ctor_from_range(
+        R &range, EnableIf<
+            IsFiniteRandomAccessRange<R> && IsPod<T> &&
+            IsSame<T, RemoveCv<RangeValue<R>>>, bool
+        > = true
+    ) {
         RangeSize<R> l = range.size();
         reserve(l);
         p_len = l;
@@ -45,15 +49,18 @@ class Vector {
     }
 
     template<typename R>
-    void ctor_from_range(R &range, EnableIf<
-        !IsFiniteRandomAccessRange<R> || !IsPod<T> ||
-        !IsSame<T, RemoveCv<RangeValue<R>>>, bool
-    > = true) {
+    void ctor_from_range(
+        R &range, EnableIf<
+            !IsFiniteRandomAccessRange<R> || !IsPod<T> ||
+            !IsSame<T, RemoveCv<RangeValue<R>>>, bool
+        > = true
+    ) {
         Size i = 0;
         for (; !range.empty(); range.pop_front()) {
             reserve(i + 1);
-            allocator_construct(p_buf.second(), &p_buf.first()[i],
-                range.front());
+            allocator_construct(
+                p_buf.second(), &p_buf.first()[i], range.front()
+            );
             ++i;
             p_len = i;
         }
@@ -86,16 +93,22 @@ public:
     Vector(A const &a = A()): p_len(0), p_cap(0), p_buf(nullptr, a) {}
 
     explicit Vector(Size n, T const &val = T(), A const &al = A()): Vector(al) {
-        if (!n) return;
+        if (!n) {
+            return;
+        }
         p_buf.first() = allocator_allocate(p_buf.second(), n);
         p_len = p_cap = n;
         Pointer cur = p_buf.first(), last = p_buf.first() + n;
-        while (cur != last)
+        while (cur != last) {
             allocator_construct(p_buf.second(), cur++, val);
+        }
     }
 
-    Vector(Vector const &v): p_len(0), p_cap(0), p_buf(nullptr,
-    allocator_container_copy(v.p_buf.second())) {
+    Vector(Vector const &v):
+        p_len(0), p_cap(0), p_buf(nullptr, allocator_container_copy(
+            v.p_buf.second())
+        )
+    {
         reserve(v.p_cap);
         p_len = v.p_len;
         copy_contents(v);
@@ -107,8 +120,11 @@ public:
         copy_contents(v);
     }
 
-    Vector(Vector &&v): p_len(v.p_len), p_cap(v.p_cap), p_buf(v.p_buf.first(),
-    move(v.p_buf.second())) {
+    Vector(Vector &&v):
+        p_len(v.p_len), p_cap(v.p_cap), p_buf(
+            v.p_buf.first(), move(v.p_buf.second())
+        )
+    {
         v.p_buf.first() = nullptr;
         v.p_len = v.p_cap = 0;
     }
@@ -140,18 +156,21 @@ public:
         if (IsPod<T>) {
             memcpy(p_buf.first(), &r[0], r.size() * sizeof(T));
         } else {
-            for (Size i = 0; i < r.size(); ++i)
+            for (Size i = 0; i < r.size(); ++i) {
                 allocator_construct(p_buf.second(), &p_buf.first()[i], r[i]);
+            }
         }
         p_len = r.size();
     }
 
     Vector(InitializerList<T> v, A const &a = A()):
-        Vector(ConstRange(v.begin(), v.size()), a) {}
+        Vector(ConstRange(v.begin(), v.size()), a)
+    {}
 
     template<typename R, typename = EnableIf<
         IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-    >> Vector(R range, A const &a = A()): Vector(a) {
+    >>
+    Vector(R range, A const &a = A()): Vector(a) {
         ctor_from_range(range);
     }
 
@@ -163,14 +182,17 @@ public:
     void clear() {
         if (p_len > 0 && !IsPod<T>) {
             Pointer cur = p_buf.first(), last = p_buf.first() + p_len;
-            while (cur != last)
+            while (cur != last) {
                 allocator_destroy(p_buf.second(), cur++);
+            }
         }
         p_len = 0;
     }
 
     Vector &operator=(Vector const &v) {
-        if (this == &v) return *this;
+        if (this == &v) {
+            return *this;
+        }
         clear();
         if (AllocatorPropagateOnContainerCopyAssignment<A>) {
             if (p_buf.second() != v.p_buf.second() && p_cap) {
@@ -187,10 +209,12 @@ public:
 
     Vector &operator=(Vector &&v) {
         clear();
-        if (p_buf.first())
+        if (p_buf.first()) {
             allocator_deallocate(p_buf.second(), p_buf.first(), p_cap);
-        if (AllocatorPropagateOnContainerMoveAssignment<A>)
+        }
+        if (AllocatorPropagateOnContainerMoveAssignment<A>) {
             p_buf.second() = v.p_buf.second();
+        }
         p_len = v.p_len;
         p_cap = v.p_cap;
         p_buf.~VecPair();
@@ -218,7 +242,8 @@ public:
 
     template<typename R, typename = EnableIf<
         IsInputRange<R> && IsConvertible<RangeReference<R>, Value>
-    >> Vector &operator=(R range) {
+    >>
+    Vector &operator=(R range) {
         clear();
         ctor_from_range(range);
         return *this;
@@ -239,13 +264,16 @@ public:
         } else {
             Pointer first = p_buf.first() + l;
             Pointer last  = p_buf.first() + p_len;
-            while (first != last)
+            while (first != last) {
                 allocator_construct(p_buf.second(), first++, v);
+            }
         }
     }
 
     void reserve(Size n) {
-        if (n <= p_cap) return;
+        if (n <= p_cap) {
+            return;
+        }
         Size oc = p_cap;
         if (!oc) {
             p_cap = max(n, Size(8));
@@ -274,28 +302,38 @@ public:
     T const &operator[](Size i) const { return p_buf.first()[i]; }
 
     T *at(Size i) {
-        if (!in_range(i)) return nullptr;
+        if (!in_range(i)) {
+            return nullptr;
+        }
         return &p_buf.first()[i];
     }
     T const *at(Size i) const {
-        if (!in_range(i)) return nullptr;
+        if (!in_range(i)) {
+            return nullptr;
+        }
         return &p_buf.first()[i];
     }
 
     T &push(T const &v) {
-        if (p_len == p_cap) reserve(p_len + 1);
+        if (p_len == p_cap) {
+            reserve(p_len + 1);
+        }
         allocator_construct(p_buf.second(), &p_buf.first()[p_len], v);
         return p_buf.first()[p_len++];
     }
 
     T &push(T &&v) {
-        if (p_len == p_cap) reserve(p_len + 1);
+        if (p_len == p_cap) {
+            reserve(p_len + 1);
+        }
         allocator_construct(p_buf.second(), &p_buf.first()[p_len], move(v));
         return p_buf.first()[p_len++];
     }
 
     T &push() {
-        if (p_len == p_cap) reserve(p_len + 1);
+        if (p_len == p_cap) {
+            reserve(p_len + 1);
+        }
         allocator_construct(p_buf.second(), &p_buf.first()[p_len]);
         return p_buf.first()[p_len++];
     }
@@ -305,9 +343,11 @@ public:
         if (IsPod<T>) {
             memcpy(p_buf.first() + p_len, v, n * sizeof(T));
         } else {
-            for (Size i = 0; i < n; ++i)
-                allocator_construct(p_buf.second(),
-                    &p_buf.first()[p_len + i], v[i]);
+            for (Size i = 0; i < n; ++i) {
+                allocator_construct(
+                    p_buf.second(), &p_buf.first()[p_len + i], v[i]
+                );
+            }
         }
         p_len += n;
         return Range(&p_buf.first()[p_len - n], &p_buf.first()[p_len]);
@@ -315,9 +355,12 @@ public:
 
     template<typename ...U>
     T &emplace_back(U &&...args) {
-        if (p_len == p_cap) reserve(p_len + 1);
-        allocator_construct(p_buf.second(), &p_buf.first()[p_len],
-            forward<U>(args)...);
+        if (p_len == p_cap) {
+            reserve(p_len + 1);
+        }
+        allocator_construct(
+            p_buf.second(), &p_buf.first()[p_len], forward<U>(args)...
+        );
         return p_buf.first()[p_len++];
     }
 
@@ -415,8 +458,9 @@ public:
         detail::swap_adl(p_len, v.p_len);
         detail::swap_adl(p_cap, v.p_cap);
         detail::swap_adl(p_buf.first(), v.p_buf.first());
-        if (AllocatorPropagateOnContainerSwap<A>)
+        if (AllocatorPropagateOnContainerSwap<A>) {
             detail::swap_adl(p_buf.second(), v.p_buf.second());
+        }
     }
 
     A get_allocator() const {