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Task/Catamorphism/D/catamorphism.d

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+void main() {
+    import std.stdio, std.algorithm, std.range, std.numeric,
+           std.conv, std.typecons, std.typetuple;
+
+    auto list = iota(1, 11);
+    alias ops = TypeTuple!(q{a + b}, q{a * b}, min, max, gcd);
+
+    foreach (op; ops)
+        writeln(op.stringof, ": ", list.reduce!op);
+
+    // std.algorithm.reduce supports multiple functions in parallel:
+    reduce!(ops[0], ops[3], text)(tuple(0, 0.0, ""), list).writeln;
+}