add octa::each

octa/functional.h

@@ -16,7 +16,7 @@ namespace octa {
 
 #define __OCTA_DEFINE_BINARY_OP(name, op, rettype) \
     template<typename T> struct name { \
-        bool operator()(const T &x, const T &y) const { return x op y; } \
+        rettype operator()(const T &x, const T &y) const { return x op y; } \
         typedef T FirstArgType; \
         typedef T SecondArgType; \
         typedef rettype ResultType; \

octa/initializer_list.h

@@ -43,6 +43,11 @@ namespace std {
 
 namespace octa {
     template<typename T> using InitializerList = std::initializer_list<T>;
+
+    template<typename T>
+    auto each(InitializerList<T> init) -> decltype(init.each()) {
+        return init.each();
+    }
 }
 
 #endif

octa/range.h

@@ -559,6 +559,21 @@ namespace octa {
     EnumeratedRange<T> enumerate(const T &it) {
         return EnumeratedRange<T>(it);
     }
+
+    template<typename T>
+    auto each(T &r) -> decltype(r.each()) {
+        return r.each();
+    }
+
+    template<typename T>
+    auto each(const T &r) -> decltype(r.each()) {
+        return r.each();
+    }
+
+    template<typename T, size_t N>
+    PointerRange<T> each(T (&array)[N]) {
+        return PointerRange<T>(array, N);
+    }
 }
 
 #endif