ranges/filterfiasco3.cpp

The following code example is taken from the book
C++23 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2026
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

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

int main()
{
  std::array<std::string, 4> coll{"Amsterdam", "Rome", "Cologne", "New York"};
  std::println("coll: {}\n", coll);

  // move \IBlong strings in reverse order to another container:
  auto large = [](const auto& s) { return s.size() > 5; };
  auto sub = coll | std::views::filter(large)           // \IBlong strings of coll
                  | std::views::reverse                 // in reverse order
                  | std::views::as_rvalue               // move them
                  | std::ranges::to<std::vector>();     // into a vector

  std::println("coll: {}", coll);
  std::println("sub:  {}", sub);  
}