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

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

In C++, you can handle errors in asynchronous code using futures and exceptions. You can wrap your async calls in try-catch blocks.

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

Sure! Here's a simple example:

#include <future>
#include <iostream>

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

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

What if I want to handle multiple async tasks?

You can use std::when_all to wait for multiple futures and handle exceptions for each one individually. Here's an example.

Thanks! Can you explain how std::when_all works?