How do I use iterator adaptors in C++?

Can you explain what iterator adaptors are in C++?

Iterator adaptors are tools that allow you to modify the behavior of iterators in C++. They can transform, filter, or combine iterators.

How do I use a filter iterator adaptor?

You can use the std::views::filter adaptor to create a view that only includes elements satisfying a specific condition.

Can you give me an example of using a filter iterator?

Sure! Here's a simple 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 << ' ';
    }
}

This will output: 2 4.

What other iterator adaptors are available?

Other common iterator adaptors include std::views::transform, std::views::take, and std::views::drop, each serving different purposes.