add pipe examples

.gitignore

@@ -1,9 +1,10 @@
 *.o
 *.core
-example/format
-example/listdir
-example/range
-example/signal
-example/stream1
-example/stream2
+examples/format
+examples/listdir
+examples/range
+examples/signal
+examples/stream1
+examples/stream2
+examples/range_pipe
 test_runner

Makefile

@@ -4,6 +4,7 @@ EXAMPLES_OBJ = \
 	examples/format \
 	examples/listdir \
 	examples/range \
+	examples/range_pipe \
 	examples/signal \
 	examples/stream1 \
 	examples/stream2

examples/range_pipe.cc

@@ -0,0 +1,56 @@
+#include <ostd/range.hh>
+#include <ostd/io.hh>
+#include <ostd/algorithm.hh>
+
+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; }))
+        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; }))
+        writeln(i);
+
+    /* prints ABCDEF (ASCII 65, 66, 67, 68, 69, 70) */
+    writeln("string gen test");
+    String s(range(6) | map([](int v) -> char { return v + 65; }));
+    writeln(s);
+
+    /* join a few ranges together - prints 11, 22, 33 ... 99 each on new line */
+    writeln("range join test");
+    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)))
+        writeln(i);
+
+    /* chunk a range into subranges - prints
+     * {11, 22, 33}
+     * {44, 55, 66}
+     * {77, 88, 99}
+     */
+    writeln("range chunk test");
+    auto cr = { 11, 22, 33, 44, 55, 66, 77, 88, 99 };
+    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))
+        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)))
+        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 })))
+        writeln(v.first, ", ", v.second);
+}