ranges/elementsviewhack.cpp

The following code example is taken from the book
C++20 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2021
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

// don't include before "elementsview.hpp"
#include "elementsviewhack.hpp"
#include <iostream>
#include <vector>
#include <ranges>

void print(const auto& coll)
{
  std::cout << "coll:\n";
  for (const auto& elem : coll) {
    std::cout << "- " << elem << '\n';
  }
}

int main()
{
  Data d1{42, "truth"};
  std::vector<Data> coll{d1, Data{0, "null"}, d1};
  print(coll);
  print(coll | std::views::take(2));
  print(coll | std::views::elements<1>);
}