How do I use ranges in C++20?

C++20 introduced a powerful new library for dealing with ranges, which simplifies common operations such as filtering, transforming, and reducing sequences of data. By using ranges, developers can write expressive and concise code that is more readable and easier to maintain.

Using Ranges in C++20

The ranges library enables you to perform operations on collections in a more functional style. Below is an example demonstrating how to use ranges to filter and transform a vector of integers:

#include <iostream> #include <vector> #include <ranges> #include <algorithm> // For std::transform int main() { std::vector numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9}; auto even_squares = numbers | std::views::filter([](int n) { return n % 2 == 0; }) | std::views::transform([](int n) { return n * n; }); for (int square : even_squares) { std::cout << square << " "; } return 0; }

C++20 ranges programming standard library filters transforms collections

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