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  1.  
  2. #include <iostream>
  3. #include <tuple>
  4. #include <string>
  5.  
  6.     namespace detail
  7.     {
  8.           template<int ... N> 
  9.           struct seq 
  10.           { 
  11.              using type = seq<N...>; 
  12.              template<int I>
  13.              struct push_back : seq<N..., I> {};
  14.           };
  15.  
  16.           template<int N> 
  17.           struct genseq : genseq<N-1>::type::template push_back<N-1> {};
  18.  
  19.           template<> 
  20.           struct genseq<0> : seq<> {};
  21.  
  22.           template<typename ... Types, int ...N>
  23.           void print(std::ostream & out, std::tuple<Types...> const & t, seq<N...>)
  24.           {
  25.              auto sink = {
  26.              	          (out << "{", 0),
  27.                           (out << (N?",":"") << std::get<N>(t) , 0)...,
  28.                           (out << "}", 0)
  29.                          };
  30.           }
  31.     }
  32.     template<typename ... Types>
  33.     std::ostream& operator<<(std::ostream & out, std::tuple<Types...> const & t)
  34.     {
  35.        detail::print(out, t, typename detail::genseq<sizeof...(Types)>::type());
  36.        return out;
  37.     }
  38.  
  39. int main()
  40. {
  41.     std::cout << std::make_tuple(10, 20.0, std::string("Nawaz")) << std::endl;
  42.     std::cout << std::make_tuple(10, 20.0, std::string("Nawaz"), 9089) << std::endl;
  43. }
Success #stdin #stdout 0s 3472KB
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Standard input is empty
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{10,20,Nawaz}
{10,20,Nawaz,9089}
https://ideone.com/2MQ0la
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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