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  1.     #include <type_traits>
  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... Args, int... Is>
  14.     auto make_pointer_tuple(std::tuple<Args...>& t, seq<Is...>)
  15.         -> std::tuple<typename std::add_pointer<Args>::type...>
  16.     {
  17.         return std::forward_as_tuple(&std::get<Is>(t)...);
  18.     }
  19.  
  20.     template<typename... Args>
  21.     auto make_pointer_tuple(std::tuple<Args...>& t)
  22.         -> std::tuple<typename std::add_pointer<Args>::type...>
  23.     {
  24.         return make_pointer_tuple(t, gen_seq<sizeof...(Args)>());
  25.     }
  26.  
  27.     #include <string>
  28.     #include <iostream>
  29.  
  30.     int main()
  31.     {
  32.         std::tuple<int, bool, std::string> myFavoriteTuple{0, false, ""};
  33.  
  34.         int* pInt = nullptr;
  35.         bool* pBool = nullptr;
  36.         std::string* pString = nullptr;
  37.         tie(pInt, pBool, pString) = make_pointer_tuple(myFavoriteTuple);
  38.  
  39.         *pInt = 42;
  40.         *pBool = true;
  41.         *pString = "Hello, World!";
  42.  
  43.         std::cout << std::get<0>(myFavoriteTuple) << std::endl;
  44.         std::cout << std::get<1>(myFavoriteTuple) << std::endl;
  45.         std::cout << std::get<2>(myFavoriteTuple) << std::endl;
  46.     }
  47.  
Success #stdin #stdout 0s 2984KB
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stdin
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Standard input is empty
stdout
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42
1
Hello, World!
https://ideone.com/BCIQUa
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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