How do I use standard views in C++20?

How do I use standard views in C++20?

In C++20, standard views allow you to create a view over a range without copying the data. You can use the std::views namespace.

Can you give me an example of using views with a vector?

Sure! You can use std::views::filter to create a view that filters elements. For example:

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

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

What other views are available in C++20?

C++20 provides several views like std::views::transform, std::views::take, and std::views::drop. Each serves different purposes for manipulating ranges.

Are there any performance benefits to using views?

Yes, using views can improve performance by avoiding unnecessary copies of data. They provide a lightweight way to work with ranges.