What are the best practices for using std::async in C++?

What are the best practices for using std::async in C++?

When using std::async, it's important to consider the launch policy. You can choose between std::launch::async and std::launch::deferred.

What is the difference between std::launch::async and std::launch::deferred?

std::launch::async runs the task in a new thread, while std::launch::deferred runs it only when the result is needed.

Are there any performance implications I should be aware of?

Yes, using std::launch::async can lead to overhead from thread management, so it's best for tasks that are long-running.

How do I handle exceptions in tasks run with std::async?

You can use future::get() to retrieve the result, which will throw any exceptions that occurred during the task.