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  1. #include <iostream>
  2.  
  3. struct X {};
  4.  
  5. template<typename T>
  6. struct Promise {};
  7.  
  8. template<typename T> constexpr bool isPromise = false;
  9. template<typename T> constexpr bool isPromise<Promise<T>> = true;
  10.  
  11. int main()
  12. {
  13.     std::cout << isPromise<int> << ' ' << isPromise<X> << std::endl;
  14.     std::cout << isPromise<Promise<int>> << ' ' << isPromise<Promise<X>> << std::endl;
  15.     return EXIT_SUCCESS;
  16. }
  17.  
Success #stdin #stdout 0s 4328KB
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https://ideone.com/FGBPCh
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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