//********************************************************
// The following code example is taken from the book
//  C++23 - The Complete Guide
//  by Nicolai M. Josuttis (www.josuttis.com)
//  http://www.cppstd23.com
//
// The code is licensed under a
//  Creative Commons Attribution 4.0 International License
//  http://creativecommons.org/licenses/by/4.0/
//********************************************************


#include <print>
#include <string>
#include <vector>
#include <ranges>

int main()
{
  std::vector<std::string> coll1{"X", "Y"};
  std::vector<std::string> coll2{"A", "B"};
  std::vector<std::string> coll3{"1", "2"};
  std::println("coll1: {}", coll1);
  std::println("coll2: {}", coll2);
  std::println("coll3: {}", coll3);

  // BAD: 
  auto vec = std::views::cartesian_product(coll1 | std::views::as_rvalue,
                                           coll2 | std::views::as_rvalue,
                                           coll3 | std::views::as_rvalue)
               | std::ranges::to<std::vector>();
  std::println("vec:   {}", vec);
}