What is std::future in C++?

Can you explain what std::future is in C++?

Sure! std::future is a class in C++ that represents a value that will be available in the future, typically from an asynchronous operation.

How do I use std::future with std::async?

You can use std::async to run a function asynchronously and get a std::future object that will hold the result of that function.

Can you give me a code example?

Of course! Here's a simple example:

#include <iostream>
#include <future>

int compute() {
    return 42;
}

int main() {
    std::future<int> result = std::async(compute);
    std::cout << "Result: " << result.get() << std::endl;
    return 0;
}

What happens if the asynchronous task throws an exception?

If the task throws an exception, calling get() on the std::future will rethrow that exception, allowing you to handle it.