What are some examples of C++20 ranges?

Can you give me some examples of how to use C++20 ranges?

Sure! C++20 ranges provide a new way to work with sequences of data. For example, you can use std::views::filter to filter elements in a range.

Can you show me a code snippet for that?

Absolutely! Here's a simple example:

#include <iostream>
#include <vector>
#include <ranges>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5, 6};
    auto even_numbers = numbers | std::views::filter([](int n) { return n % 2 == 0; });

    for (int n : even_numbers) {
        std::cout << n << ' ';
    }
}

This will output: 2 4 6.

What other range operations can I perform?

You can also use std::views::transform to apply a function to each element, or std::views::take to get a specific number of elements from the start.

That sounds great! Can you provide an example of std::views::transform?

Sure! Here's an example that squares each number in a range:

#include <iostream>
#include <vector>
#include <ranges>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    auto squared_numbers = numbers | std::views::transform([](int n) { return n * n; });

    for (int n : squared_numbers) {
        std::cout << n << ' ';
    }
}

This will output: 1 4 9 16 25.