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  1. #include <iostream>
  2. #include <tuple>
  3.  
  4. template <typename T, typename Tuple>
  5. auto push_front(const T& t, const Tuple& tuple)
  6. {
  7.     return std::tuple_cat(std::make_tuple(t), tuple);
  8. }
  9.  
  10. template <typename Tuple, std::size_t ... Is>
  11. auto pop_front_impl(const Tuple& tuple, std::index_sequence<Is...>)
  12. {
  13.     return std::make_tuple(std::get<1 + Is>(tuple)...);
  14. }
  15.  
  16. template <typename Tuple>
  17. auto pop_front(const Tuple& tuple)
  18. {
  19.     return pop_front_impl(tuple,
  20.                           std::make_index_sequence<std::tuple_size<Tuple>::value - 1>());
  21. }
  22.  
  23. int main()
  24. {
  25.     std::tuple<char> tc{'*'};
  26.  
  27.     std::tuple<int, char> tic = push_front(42, tc);
  28.     std::tuple<char> tc2 = pop_front(tic);
  29.     std::cout << (tc == tc2) << std::endl;
  30. }
  31.  
Success #stdin #stdout 0s 3468KB
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https://ideone.com/dtc1fQ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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