What is the difference between std::lock and std::shared_lock?

What is the difference between std::lock and std::shared_lock?

std::lock is used to acquire a unique lock on a mutex, ensuring exclusive access. std::shared_lock allows multiple threads to read while preventing writes.

When should I use std::shared_lock instead of std::lock?

Use std::shared_lock when you have multiple readers and want to allow concurrent access, but need to prevent writing.

Can you give an example of when to use each?

Sure! Use std::lock when updating shared data, and std::shared_lock when multiple threads need to read data without modifying it.

Are there any performance considerations?

Yes, std::shared_lock can improve performance in read-heavy scenarios, but it may introduce overhead due to managing shared access.