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  1. #include <iostream>
  2.  
  3. template<bool T, class U = void>
  4. struct enable__if
  5. {};
  6.  
  7. template<class T>
  8. struct enable__if<true,T>
  9. {
  10. 	typedef T type;
  11. };
  12.  
  13. template <typename T, typename U>
  14. typename enable__if<std::is_same<typename U::value_type,T>::value,std::size_t>::type
  15. non_empties(const U& r)
  16. {
  17.     return !r.empty();
  18. }
  19.  
  20. template <typename T, typename U>
  21. typename enable__if<!std::is_same<typename U::value_type,T>::value,std::size_t>::type
  22. non_empties(const U& r)
  23. {
  24.     std::size_t res = 0;
  25.     for(auto& it : r)
  26.     {
  27.         res += non_empties<T>(it);
  28.     }
  29.     return res;
  30. }
  31.  
  32. int main()
  33. {
  34.     return 0;
  35. }
Success #stdin #stdout 0s 3292KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/nKhPyF
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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