How do I handle errors in C++ asynchronous programming?

How do I handle errors in C++ asynchronous programming?

In C++, you can handle errors in asynchronous programming using futures and exceptions. When you call an async function, it returns a future that can be used to check for errors.

Can you give me an example of using futures for error handling?

Sure! Here's a simple example:

#include <future>
#include <iostream>
#include <stdexcept>

int riskyFunction() {
    throw std::runtime_error("Error occurred!");
}

int main() {
    std::future<int> result = std::async(std::launch::async, riskyFunction);
    try {
        result.get(); // This will throw the exception
    } catch (const std::exception& e) {
        std::cout << "Caught an exception: " << e.what() << std::endl;
    }
}

What happens if I don't catch the exception?

If you don't catch the exception, it will propagate up and terminate the program, leading to an unhandled exception error.

Are there any best practices for error handling in async C++?

Yes, some best practices include using try-catch blocks around your async calls, checking the status of futures, and logging errors for debugging.