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

Can you explain the difference between std::shared_lock and std::unique_lock in C++?

Sure! std::unique_lock provides exclusive ownership of a mutex, allowing only one thread to own it at a time. std::shared_lock, on the other hand, allows multiple threads to share access to a resource, but only one can modify it.

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

You should use std::shared_lock when you want to allow multiple threads to read from a shared resource without modifying it. Use std::unique_lock when you need to ensure that only one thread can access or modify the resource at a time.

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

Certainly! Use std::shared_lock in a scenario where multiple threads need to read data from a shared database. Use std::unique_lock when a thread needs to write to that database, ensuring no other thread can read or write simultaneously.

Are there any performance implications of using one over the other?

Yes, std::shared_lock can improve performance in read-heavy scenarios by allowing concurrent reads. However, std::unique_lock may introduce more overhead due to its exclusive access, which can be a bottleneck in write-heavy scenarios.