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  1.     #include <vector>
  2.     #include <tuple>
  3.  
  4.     template <int... Is>
  5.     struct seq {};
  6.  
  7.     template <int N, int... Is>
  8.     struct gen_seq : gen_seq<N - 1, N - 1, Is...> {};
  9.  
  10.     template <int... Is>
  11.     struct gen_seq<0, Is...> : seq<Is...> {};
  12.  
  13.     template <typename... T, int... Is>
  14.     auto transpose(std::tuple<std::vector<T>...>& var, seq<Is...>)
  15.         -> std::vector<std::tuple<T...>>
  16.     {
  17.         std::vector<std::tuple<T...>> result;
  18.         for (std::size_t i = 0; i < std::get<0>(var).size(); i++)
  19.         {
  20.             std::tuple<T...> t = std::make_tuple(std::get<Is>(var)[i]...);
  21.             result.push_back(t);
  22.         }
  23.  
  24.         return result;
  25.     }
  26.  
  27.     template <typename... T, int... Is>
  28.     auto transpose(std::tuple<std::vector<T>...>& var)
  29.         -> std::vector<std::tuple<T...>>
  30.     {
  31.         return transpose(var, gen_seq<sizeof...(T)>());
  32.     }
  33.  
  34.     #include <iostream>
  35.     #include <iomanip>
  36.  
  37.     int main()
  38.     {
  39.         std::vector<int> vi = {42, 1729, 6};
  40.         std::vector<bool> vb = {true, false, false};
  41.         std::vector<std::string> vs = {"Hi", "Hey", "Ho"};
  42.         auto t = make_tuple(vi, vb, vs);
  43.         auto v = transpose(t);
  44.  
  45.         std::cout << std::boolalpha;
  46.         for (auto const& t : v)
  47.         {
  48.             std::cout << "(";
  49.             std::cout << std::get<0>(t);
  50.             std::cout << ", " << std::get<1>(t);
  51.             std::cout << ", " << std::get<2>(t);
  52.             std::cout << ")" << std::endl;
  53.         }
  54.     }
  55.  
Success #stdin #stdout 0s 2992KB
comments (?)
stdin
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Standard input is empty
stdout
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(42, true, Hi)
(1729, false, Hey)
(6, false, Ho)
https://ideone.com/0pNbjI
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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