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  1.     #include <string>
  2.     #include <iostream>
  3.     #include <tuple>
  4.  
  5.     namespace detail
  6.     {
  7.         template<int... Is>
  8.         struct seq { };
  9.  
  10.         template<int N, int... Is>
  11.         struct gen_seq : gen_seq<N - 1, N - 1, Is...> { };
  12.  
  13.         template<int... Is>
  14.         struct gen_seq<0, Is...> : seq<Is...> { };
  15.  
  16.         template<typename T, typename F, int... Is>
  17.         void for_each(T&& t, F f, seq<Is...>)
  18.         {
  19.             auto l = { (f(std::get<Is>(t)), 0)... };
  20.         }
  21.     }
  22.  
  23.     template<typename... Ts, typename F>
  24.     void for_each_in_tuple(std::tuple<Ts...> const& t, F f)
  25.     {
  26.         detail::for_each(t, f, detail::gen_seq<sizeof...(Ts)>());
  27.     }
  28.  
  29.     struct my_functor
  30.     {
  31.         template<typename T>
  32.         void operator () (T&& t)
  33.         {
  34.             std::cout << t << std::endl;
  35.         }
  36.     };
  37.  
  38.     int main()
  39.     {
  40.         std::tuple<int, double, std::string> t(42, 3.14, "Hello World!");
  41.         for_each_in_tuple(t, my_functor());
  42.     }
  43.  
Success #stdin #stdout 0s 3028KB
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stdin
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Standard input is empty
stdout
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42
3.14
Hello World!
https://ideone.com/j6dNE5
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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