C++: What is std::ranges::views?

1#include <ranges>
2#include <vector>
3
4std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
5
6// Lazy pipeline
7auto result = v
8    | std::views::filter([](int n) { return n % 2 == 0; })
9    | std::views::transform([](int n) { return n * n; })
10    | std::views::take(3);
11
12for (int n : result) {
13    std::cout << n << " "; // 4 16 36
14}