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  1. #include <iostream>
  2. #include <vector>
  3. #include <map>
  4. #include <list>
  5. #include <set>
  6. #include <type_traits>
  7. #include<tuple>
  8.  
  9. template <typename> struct prank : std::integral_constant<std::size_t, 0> {};
  10.  
  11. template <template <typename...> class C, typename ...Args>
  12. struct prank<C<Args...>>
  13. : std::integral_constant<
  14.     std::size_t,
  15.     1 + prank<typename C<Args...>::value_type>::value> {};
  16.  
  17. template <typename U, typename V>
  18. struct prank<std::pair<U, V>>
  19. : std::integral_constant<std::size_t, 1 + prank<V>::value> {};
  20.  
  21. template <typename... Args>
  22. struct prank<std::tuple<Args...>>
  23. : std::integral_constant<std::size_t, 1> {};
  24.  
  25. template <typename T,typename... Args>
  26. struct prank<std::tuple<T,Args...>>
  27. : std::integral_constant<std::size_t, prank<T>::value+prank<std::tuple<Args...>>::value> {};
  28.  
  29. int main()
  30. {
  31.     {
  32.         using T = std::vector<std::set<std::list<int>>>;
  33.         std::cout << prank<T>::value << "\n";
  34.     }
  35.     {
  36.         using T =std::tuple<std::map<std::list<int>,std::list<int>>,std::list<int>,std::list<int>,std::list<int>>;
  37.         std::cout << prank<T>::value << "\n";
  38.     }
  39.     {
  40.         using T = std::vector<std::map<std::list<int>,std::list<int>>>;
  41.         std::cout << prank<T>::value << "\n";
  42.     }
  43. }
  44.  
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
3
7
4
https://ideone.com/mir2xr
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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