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

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

Asynchronous programming in C++ can be achieved using features like std::async, futures, and promises. Would you like to see a code example?

Yes, please provide a code example 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() {
    std::future<int> result = std::async(std::launch::async, asyncTask);
    std::cout << "Waiting for result..." << std::endl;
    std::cout << "Result: " << result.get() << std::endl;
    return 0;
}

This code runs asyncTask asynchronously and retrieves the result after waiting.

What are futures and promises in C++?

Futures and promises are used for asynchronous operations. A promise is a way to set a value that will be available in the future, while a future is a way to access that value once it's ready.

Can you explain how to handle exceptions in asynchronous tasks?

Certainly! You can catch exceptions in the asynchronous task and store them in the future. When you call get() on the future, it will rethrow the exception if one occurred.