How do I handle exceptions in std::async?

How do I handle exceptions in std::async?

You can handle exceptions in std::async by using try-catch blocks around the code you run asynchronously.

Can you show me an example of that?

Sure! Here's a simple example:

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

int riskyFunction() {
    throw std::runtime_error("Something went wrong!");
}

int main() {
    auto future = std::async(std::launch::async, riskyFunction);
    try {
        future.get();
    } catch (const std::exception& e) {
        std::cout << "Caught exception: " << e.what() << std::endl;
    }
}

What happens if I don't catch the exception?

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

Are there any best practices for using std::async?

Yes, some best practices include using std::launch::async to ensure the task runs in a separate thread and managing resources carefully.