adding result_of example

example/result_of/example.cpp

@@ -0,0 +1,34 @@
+/*!
+Copyright (c) 2016 Barrett Adair
+
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+*/
+
+#include <callable_traits/callable_traits.hpp>
+
+namespace ct = callable_traits;
+
+using expect = int;
+
+struct foo;
+
+template<typename T>
+void test() {
+    using result = ct::result_of<T>;
+    static_assert(std::is_same<expect, result>{}, "");
+}
+
+int main() {
+
+    test<int()>();
+    test<int(*)()>();
+    test<int(&)()>();
+    test<int() const>();
+    test<int(foo::*)() const>();
+
+    auto x = []() -> int { return 0; };
+
+    test<decltype(x)>();
+}
+