What are the differences between C++ async and threads?

What are the differences between C++ async and threads?

C++ async is a higher-level abstraction for asynchronous operations, while threads provide lower-level control over concurrency.

Can you explain how C++ async works?

C++ async allows you to run tasks asynchronously, returning a future that can be used to retrieve the result later.

When should I use async instead of threads?

Use async for simpler, non-blocking tasks where you don't need fine-grained control, while threads are better for complex concurrency.

Are there any performance differences between them?

Yes, async can be more efficient for I/O-bound tasks, while threads may perform better for CPU-bound tasks due to lower overhead.