Using Ruse to make handling function pointers easier

include/gp/functional/function.hpp

@@ -122,6 +122,10 @@ namespace gp{
 			);
 		}
 
+		function(ret f_ptr(args...))
+		: function(f_ptr, nullopt)
+		{}
+
 		function(function&& rhs)
 		: alloc(rhs.alloc)
 		, invokator(rhs.invokator)