cleaning up interface, adding std_function example

example/std_function/make_function.hpp

@@ -0,0 +1,40 @@
+#include <functional>
+#include <callable_traits/callable_traits.hpp>
+
+#ifndef EXAMPLE_ADAPTORS_HPP
+#define EXAMPLE_ADAPTORS_HPP
+
+namespace example {
+
+    namespace ct = callable_traits;
+
+    //`make_function` turns any (non-overloaded) callable into std::function
+    template<typename T>
+    inline decltype(auto) make_function(T&& t) {
+        using signature = ct::function_type<T&&>;
+        using result_type = std::function<signature>;
+        return result_type{ ::std::forward<T>(t) };
+    }
+
+    //this `make_function` overload turns a bind expression into std::function
+    template<typename T, typename First, typename... Others>
+    inline decltype(auto) make_function(T&& t, First&& first, Others&&... others) {
+
+        using bind_expr = decltype(::callable_traits::bind(
+            ::std::forward<T>(t),
+            ::std::forward<First>(first),
+            ::std::forward<Others>(others)...
+        ));
+
+        using signature = ct::function_type<bind_expr>;
+        using result_type = std::function<signature>;
+
+        return result_type{ ::std::bind(
+            ::std::forward<T>(t),
+            ::std::forward<First>(first),
+            ::std::forward<Others>(others)...
+        )};
+    }
+}
+
+#endif