C++: What is std::ranges::elements_of and std::ranges::zip_view?

1#include <ranges>
2
3std::vector<int> ids = {1, 2, 3};
4std::vector<std::string> names = {"Alice", "Bob", "Charlie"};
5
6// Zip ranges
7auto zipped = std::views::zip(ids, names);
8
9// Iterate
10for (auto [id, name] : zipped) {
11    std::cout << id << ": " << name << "\n";
12}
13
14// Access elements
15auto [first_id, first_name] = *zipped.begin();
16
17// Tuple access
18std::cout << std::get<0>(*zipped.begin());  // 1
19std::cout << std::get<1>(*zipped.begin());  // Alice
20
21// Composable
22auto result = std::views::zip(ids, names)
23    | std::views::filter([](auto tuple) {
24        auto [id, name] = tuple;
25        return id > 1;
26    });
27
28for (auto [id, name] : result) {
29    std::cout << id << ": " << name << "\n";
30}
31// 2: Bob
32// 3: Charlie
33
34// Zip with transform
35auto combined = std::views::zip_transform(
36    [](int id, std::string name) {
37        return std::to_string(id) + ": " + name;
38    },
39    ids, names
40);
41// "1: Alice", "2: Bob", "3: Charlie"