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  1. #include <tuple>
  2. #include <iostream>
  3. #include <type_traits>
  4.  
  5. template <size_t n, typename... T>
  6. typename std::enable_if<(n >= sizeof...(T))>::type
  7.     print_tuple(std::ostream&, const std::tuple<T...>&)
  8. {}
  9.  
  10. template <size_t n, typename... T>
  11. typename std::enable_if<(n < sizeof...(T))>::type
  12.     print_tuple(std::ostream& os, const std::tuple<T...>& tup)
  13. {
  14.     if (n != 0)
  15.         os << ", ";
  16.     os << std::get<n>(tup);
  17.     print_tuple<n+1>(os, tup);
  18. }
  19.  
  20. template <typename... T>
  21. std::ostream& operator<<(std::ostream& os, const std::tuple<T...>& tup)
  22. {
  23.     os << "[";
  24.     print_tuple<0>(os, tup);
  25.     return os << "]";
  26. }
  27.  
  28. int main()
  29. {
  30.     std::cout << std::make_tuple(2, 3.14159F, 2345.678) << std::endl;
  31.     std::cout << std::make_tuple("hello", 5) << std::endl;
  32.     std::cout << std::make_tuple() << std::endl;
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0s 2828KB
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stdin
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Standard input is empty
stdout
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[2, 3.14159, 2345.68]
[hello, 5]
[]
https://ideone.com/usR3t
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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