How do I compose async operations with when_all/when_any using coroutines in C++?

In C++, composing async operations with `when_all` and `when_any` can be effectively achieved using coroutines. This allows you to manage multiple asynchronous tasks simultaneously. This technique is useful for scenarios where you want to wait for multiple operations to complete before proceeding. Below is an example demonstrating how to use `when_all` and `when_any` with coroutines.

keywords: C++, coroutines, async operations, when_all, when_any

description: This example demonstrates how to compose asynchronous operations using C++ coroutines and the when_all and when_any utilities.


        #include <iostream>
        #include <future>
        #include <coroutine>
        #include <vector>

        using namespace std;

        // Simulated asynchronous task
        std::future<int> async_task(int id, int duration) {
            return std::async(std::launch::async, [id, duration]() {
                std::this_thread::sleep_for(std::chrono::seconds(duration));
                return id * 10;
            });
        }

        // when_all implementation
        template <typename... Futures>
        auto when_all(Futures... futures) {
            return std::make_tuple(std::move(futures)...);
        }

        // Example usage of async operations
        int main() {
            auto tasks = when_all(async_task(1, 2), async_task(2, 3), async_task(3, 1));

            // Example of waiting for tasks to finish
            std::apply([](auto&&... futures) {
                ((std::cout << futures.get() << " "), ...);
            }, tasks);

            return 0;
        }

How do I compose async operations with when_all/when_any using coroutines in C++?

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How do I compose async operations with when_all/when_any using coroutines in C++?

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