What are the differences between std::lock_guard and std::unique_lock in C++?

What are the differences between std::lock_guard and std::unique_lock in C++?

std::lock_guard is a simple RAII-style lock that provides a scoped lock, while std::unique_lock is more flexible and can be unlocked and locked again.

When should I use std::unique_lock instead of std::lock_guard?

Use std::unique_lock when you need to lock and unlock multiple times or when you need to transfer ownership of the lock.

Are there any performance differences between the two?

Yes, std::lock_guard is generally faster due to its simplicity, but std::unique_lock offers more features at a slight performance cost.

Can you give an example of when to use each?

Sure! Use std::lock_guard for simple, scoped locking, and std::unique_lock for more complex scenarios like condition variables.