Talk:cpp/ranges/zip view

Stanislaw (talk) 10:22, 24 November 2022 (PST) Stanislaw

Example from : [1]

   #include <list>
   #include <array>
   #include <tuple>
   #include <ranges>
   #include <vector>
   #include <string>
   #include <iostream>
   
   void print(auto const rem, auto const& range) {
   for (std::cout << rem; auto const& elem : range)
       std::cout << elem << ' ';
   std::cout << '\n';
   }
   
   int main() {
       auto x = std::vector{1, 2, 3, 4};
       auto y = std::list<std::string>{"α", "β", "γ", "δ", "ε"};
       auto z = std::array{'A', 'B', 'C', 'D', 'E', 'F'};
   
       print("Source views:", "");
       print("x: ", x);
       print("y: ", y);
       print("z: ", z);
   
       print("\nzip(x,y,z):", "");
       for (std::tuple<int&, std::string&, char&> elem : std::views::zip(x, y, z)) {
           std::cout << std::get<0>(elem) << ' '
                   << std::get<1>(elem) << ' '
                   << std::get<2>(elem) << '\n';
   
           std::get<char&>(elem) += ('a' - 'A'); // modifies the element of z
       }
   
       print("\nAfter modification, z: ", z);
   }

Error:

   main.cpp: In function ‘int main()’:
   main.cpp:26:67: error: ‘zip’ is not a member of ‘std::views’
   26 |     for (std::tuple<int&, std::string&, char&> elem : std::views::zip(x, y, z)) {
       |                                                                   ^~~

Compiler GCC v12.1 C++23

Can somebody help with issue where is zip?

Thank's

Right, views::zip is not implemented in the online gcc-12.1. This is why we sometimes provide temporary links to Compiler Explorer, like this, so the users can check out the examples online.

--Space Mission (talk) 11:07, 24 November 2022 (PST)

re directly using Compiler Explorer - last time I asked (on cpp slack), Godbolt said anytime. Someone just has to do the magic --Cubbi (talk) 20:27, 24 November 2022 (PST)