C++: std::async vs Futures

What are the main differences between std::async and futures in C++?

std::async is a function that runs a task asynchronously and returns a future, while futures are objects that hold the result of an asynchronous operation.

Can you explain how to use std::async with a simple example?

Sure! You can use std::async like this: auto future = std::async(std::launch::async, [](){ return 42; }); This runs the lambda asynchronously.

What are the advantages of using std::async over traditional threading?

std::async simplifies thread management by handling the thread lifecycle automatically and provides a straightforward way to retrieve results.

Are there any performance considerations I should be aware of?

Yes, using std::async can introduce overhead due to thread management. It's best for tasks that are not too lightweight.