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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. //#define DEFINE_F
  5.  
  6. #ifdef DEFINE_F
  7. void f()
  8. {
  9.  
  10. }
  11. #endif
  12.  
  13. namespace
  14. {
  15. 	constexpr struct special
  16.     {
  17.       std::false_type operator()() const;
  18.     }f;	
  19. }
  20.  
  21. struct checkForF
  22. {
  23. 	static const constexpr auto value = std::conditional< std::is_same<std::false_type, decltype(::f())>::value, std::false_type, std::true_type >::type();
  24. };
  25.  
  26. int main()
  27. {
  28.   	std::cout << checkForF::value << std::endl;
  29. }
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https://ideone.com/WNvmbv
lenguaje:
C++14 (gcc 8.3)
created:
9 years ago
visibilidad:
secret

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