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  1. #include <type_traits>
  2. #include <iostream>
  3.  
  4. template<class T>
  5. struct trait{ using type = typename T::type; };
  6.  
  7. template<class T, class U = typename trait<T>::type>
  8. void f(int);
  9. void f(...);
  10.  
  11. template<class T, class U = typename T::type>
  12. int g(int);
  13. void g(...);
  14.  
  15. template<class>
  16. struct dependent_false : std::true_type{};
  17.  
  18. template<class T>
  19. struct X{
  20.     static_assert(dependent_false<T>(), "...");
  21.     using type = void;
  22. };
  23.  
  24. int main(){
  25.    //  f<int>(0);
  26.     decltype(g<X<int>>(0)) y=5;
  27.     std::cout<<"y: "<<y<<std::endl;
  28. }
Success #stdin #stdout 0s 5276KB
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stdin
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Standard input is empty
stdout
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y: 5
https://ideone.com/Dx4Elr
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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