What are some examples of async programming in C++?

What are some examples of async programming in C++?

Async programming in C++ allows for non-blocking operations. For example, using std::async to run tasks concurrently.

Can you show me a code snippet using std::async?

Sure! Here's a simple example:

#include <iostream>
#include <future>
#include <chrono>

int asyncTask() {
    std::this_thread::sleep_for(std::chrono::seconds(2));
    return 42;
}

int main() {
    auto future = std::async(std::launch::async, asyncTask);
    std::cout << "Waiting for result..." << std::endl;
    std::cout << "Result: " << future.get() << std::endl;
}

What does std::launch::async do in this example?

std::launch::async ensures that the task runs on a new thread, allowing it to execute concurrently with the main thread.

Are there any other async features in C++?

Yes, C++ also has std::promise and std::future for more complex async operations, allowing for communication between threads.