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

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

The main difference is that std::thread creates a new thread of execution, while std::async may run a task asynchronously in a new thread or in the same thread, depending on the policy.

Can you explain when to use std::thread instead of std::async?

Use std::thread when you need fine control over thread management and execution. std::async is better for simpler tasks where you want automatic management of the thread.

What are the performance implications of using one over the other?

std::thread can be more efficient for long-running tasks, while std::async may introduce overhead due to its management of futures and potential thread pooling.

Are there any scenarios where std::async is preferred?

Yes, std::async is preferred for tasks that are short-lived or when you want to easily retrieve results without managing threads manually.