C++: What is std::views::zip_transform (C++23)?

1#include <ranges>
2
3std::vector<int> v1 = {1, 2, 3};
4std::vector<int> v2 = {4, 5, 6};
5
6// Add corresponding elements
7auto sums = std::views::zip_transform(std::plus{}, v1, v2);
8for (int x : sums) {
9    std::cout << x << " ";  // 5 7 9
10}
11
12// Custom lambda
13auto products = std::views::zip_transform(
14    [](int a, int b) { return a * b; },
15    v1, v2
16);
17// 4 10 18
18
19// Three ranges
20std::vector<int> v3 = {7, 8, 9};
21auto sum3 = std::views::zip_transform(
22    [](int a, int b, int c) { return a + b + c; },
23    v1, v2, v3
24);
25// 12 15 18
26
27// Composable
28auto result = std::views::zip_transform(std::plus{}, v1, v2)
29    | std::views::filter([](int x) { return x > 6; });
30// 7 9
31
32// Size is minimum of all ranges
33std::vector<int> v4 = {1, 2};
34auto r = std::views::zip_transform(std::plus{}, v1, v4);
35std::cout << r.size();  // 2