ranges/enumerateview.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 <vector>
#include <ranges>

int main()
{
  std::vector<std::string> coll{"tic", "tac", "toe"};
  std::println("{}\n", coll);           // tic tac toe

  for (auto [idx, elem] : std::views::enumerate(coll)) {
    std::println("{}: {}", idx, elem);  // 0:tic 1:tac 2:toe
  }
  std::println("");

  for (auto [idx, elem] : coll | std::views::enumerate) {
    std::println("{}: {}", idx, elem);  // 0:tic 1:tac 2:toe
  }
  std::println("");
}