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  1. #include<iostream>
  2. #include<type_traits>
  3.  
  4. template <typename ...Ts>
  5. struct types;
  6.  
  7. template <typename T, typename ...Ts>
  8. struct types < T, Ts... > : public types<Ts...>
  9. {
  10.     template <typename F, int i = 0>
  11. 	struct find : public types<Ts...>::template find<F, i>
  12. 	{
  13. 	};
  14.  
  15. 	template <int i>
  16. 	struct find < T, i > : public std::true_type
  17. 	{
  18. 		typedef T type;
  19. 	};
  20. };
  21.  
  22. template <>
  23. struct types < >
  24. {
  25. 	template <typename F, int i = 0>
  26. 	struct find : public std::false_type
  27. 	{};
  28. };
  29.  
  30.  
  31. int main()
  32. {
  33.     using namespace std;
  34.     cout << types<int, char>::find<int>::value << endl;
  35.     cout << types<int, char>::find<float>::value << endl;
  36. }
  37.  
Success #stdin #stdout 0s 3096KB
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https://ideone.com/boxJLq
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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