What is the difference between unique_lock and lock_guard in C++?

What is the difference between unique_lock and lock_guard in C++?

Both unique_lock and lock_guard are used for managing mutexes in C++. The main difference is that unique_lock provides more flexibility, allowing for deferred locking and unlocking, while lock_guard is simpler and automatically locks the mutex upon creation and unlocks it when it goes out of scope.

Can you give me an example of when to use each?

Sure! Use lock_guard when you want a simple, scoped lock without needing to unlock it manually. Use unique_lock when you need to lock and unlock the mutex multiple times within the same scope.

Are there any performance differences between them?

Yes, lock_guard is generally more efficient because it has less overhead. unique_lock has additional features, which can introduce some performance cost, but it’s worth it when you need its flexibility.

Which one is safer to use?

Both are safe when used correctly, but lock_guard is simpler and less prone to errors due to its automatic management of the lock.