fork(3) download 
  1. #include <iostream>
  2. #include <tuple>
  3. #include <typeinfo>
  4.  
  5. template <typename T>
  6. struct function_traits;
  7.  
  8. template <typename T_Ret, typename ...T_Args>
  9. struct function_traits<T_Ret(T_Args...)> {
  10. 	// Number of arguments.
  11. 	enum { arity = sizeof...(T_Args) };
  12. 	// Argument types.
  13. 	template <size_t i>
  14. 	struct args {
  15. 		using type
  16. 			= typename std::tuple_element<i, std::tuple<T_Args...>>::type;
  17. 	};
  18. };
  19.  
  20. int main() {
  21. 	using Arg0 = function_traits<int(float)>::args<0>::type;
  22. 	//using Arg1 = function_traits<int(float)>::args<1>::type; // Error, should be void.
  23.  
  24. 	std::cout << typeid(Arg0).name() << std::endl;
  25. 	//std::cout << typeid(Arg1).name() << std::endl;
  26. }
  27.  
Success #stdin #stdout 0s 3468KB
comments (?)
stdin 
Standard input is empty
stdout 
f
https://ideone.com/qM9Jxp
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!