lib/spanview.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

#include <iostream>
#include <string>
#include <vector>
#include <ranges>
#include <algorithm>
#include <span>

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

int main()
{
  std::vector<std::string> vec{"New York", "Tokyo", "Rio", "Berlin", "Sydney"};
  print(vec);

  // sort the three elements in the middle:
  std::ranges::sort(std::span{vec}.subspan(1, 3));
  print(vec);

  // print last three elements:
  print(std::span{vec}.last(3));
}