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));
}