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  1. #include <iostream>
  2. #include <tuple>
  3.  
  4. namespace aux{
  5. template<std::size_t...> struct seq{};
  6.  
  7. template<std::size_t N, std::size_t... Is>
  8. struct gen_seq : gen_seq<N-1, N-1, Is...>{};
  9.  
  10. template<std::size_t... Is>
  11. struct gen_seq<0, Is...> : seq<Is...>{};
  12.  
  13. template<class Ch, class Tr, class Tuple, std::size_t... Is>
  14. void print_tuple(std::basic_ostream<Ch,Tr>& os, Tuple const& t, seq<Is...>){
  15.   using swallow = int[];
  16.   (void)swallow{0, (void(os << (Is == 0? "" : ", ") << std::get<Is>(t)), 0)...};
  17. }
  18. } // aux::
  19.  
  20. template<class Ch, class Tr, class... Args>
  21. auto operator<<(std::basic_ostream<Ch, Tr>& os, std::tuple<Args...> const& t)
  22.     -> std::basic_ostream<Ch, Tr>&
  23. {
  24.   os << "(";
  25.   aux::print_tuple(os, t, aux::gen_seq<sizeof...(Args)>());
  26.   return os << ")";
  27. }
  28.  
  29. int main(){
  30.   std::cout << std::make_tuple(5, "Hello", -0.1) << "\n";
  31.   std::cout << std::make_tuple() << "\n";
  32. }
Success #stdin #stdout 0s 2896KB
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stdin
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Standard input is empty
stdout
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(5, Hello, -0.1)
()
https://ideone.com/Rihfre
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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