What are some examples of C++20 standard views?

Can you give me some examples of C++20 standard views?

Sure! C++20 introduced several standard views like std::views::filter, std::views::transform, and std::views::take. These allow for lazy evaluation of sequences.

How does std::views::filter work?

std::views::filter creates a view that only includes elements satisfying a specified predicate. For example, you can filter out even numbers from a range.

Can you show me a code snippet using std::views::transform?

Absolutely! Here's a simple example:

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

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

This will output the squares of the numbers.

What are the benefits of using views in C++20?

Using views allows for more efficient and expressive code. They enable lazy evaluation, reduce memory overhead, and can lead to clearer intent in your code.