How do I handle errors in C++14 async functions?

How do I handle errors in C++14 async functions?

In C++14, you can handle errors in async functions using futures and exceptions. When an exception occurs, it can be caught when you call get() on the future.

Can you show me a code example?

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 to the calling thread, potentially causing the program to terminate.

Are there any best practices for using async in C++?

Yes, some best practices include using std::future for result handling, ensuring proper exception handling, and avoiding shared state.