fork download 
  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. template <class F, class G, class ... Args>
  5. auto static_if (std::true_type, F && f, G && g, Args && ... args) {
  6. 	return std::forward<F> (f) (std::forward<Args>(args)...);
  7. }	
  8.  
  9. template <class F, class G, class ... Args>
  10. auto static_if (std::false_type, F && f, G && g, Args && ... args) {
  11. 	return std::forward<G> (g) (std::forward<Args>(args)...);
  12. }
  13.  
  14.  
  15. template <class T> std::true_type constexpr is_pointer (T *) { return {}; }
  16. template <class T> std::false_type constexpr is_pointer (T) { return {}; }
  17.  
  18. int main() {
  19. 	int x = 5;
  20. 	static_if (
  21. 		is_pointer (x),
  22. 	    [] (auto x) { std::cout << *x << std::endl; },
  23. 	    [] (auto x) { std::cout << "no pointer" << std::endl; },
  24. 	    x
  25. 	);
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 3412KB
comments (?)
stdin 
Standard input is empty
stdout 
no pointer
https://ideone.com/frGsrA
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!