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  1. #include <iostream>
  2. #include <tuple>
  3. #include <type_traits>
  4.  
  5. template<std::size_t I = 0, typename... Tp>
  6. typename std::enable_if<I == sizeof...(Tp), int>::type
  7. elements_size(std::tuple<Tp...>&) { return 0; }
  8.  
  9. template<std::size_t I = 0, typename... Tp>
  10. typename std::enable_if<I < sizeof...(Tp), int>::type
  11. elements_size(std::tuple<Tp...>& t) {
  12.     return sizeof(typename std::tuple_element<I, std::tuple<Tp...>>::type) + elements_size<I + 1, Tp...>(t);
  13. }
  14.  
  15. int main()
  16. {
  17.     std::tuple<int, int, char> t;
  18.     std::cout << elements_size(t) << std::endl;
  19.  
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0s 3460KB
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https://ideone.com/yNH8S3
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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