fork download 
  1.  
  2. #include <iostream>
  3.  
  4. struct A    { void reset() { std::cout << "reset A" << std::endl; } };
  5. struct B    { void reset() { std::cout << "reset B" << std::endl; } };
  6.  
  7. struct X :public A{};
  8.  
  9. template <typename T, typename R, typename BT>
  10. typename std::enable_if<std::is_base_of<BT, T>::value, R>::type
  11. call_if_possible(T & obj, R(BT::*mf)())
  12. {
  13. 	return (obj.*mf)();
  14. }
  15.  
  16. template <typename T, typename R, typename BT>
  17. typename std::enable_if<!std::is_base_of<BT, T>::value, R>::type
  18. call_if_possible(T & obj, R(BT::*mf)()) { }
  19.  
  20. int main()
  21. {
  22. 	X x;
  23.  
  24. 	call_if_possible(x, &A::reset);
  25. 	call_if_possible(x, &B::reset);
  26. }
  27.  
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
reset A
https://ideone.com/hgHRET
language:
C++14 (gcc 8.3)
created:
9 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!