What are the differences between unique_ptr, shared_ptr, and weak_ptr in C++?

What are the differences between unique_ptr, shared_ptr, and weak_ptr in C++?

In C++, unique_ptr is a smart pointer that owns a dynamically allocated object exclusively. shared_ptr allows multiple pointers to share ownership of an object, while weak_ptr is used to break circular references by providing a non-owning reference to an object managed by shared_ptr.

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

Sure! Use unique_ptr when you want sole ownership of an object, shared_ptr when you need shared ownership, and weak_ptr to avoid memory leaks in cases of circular references.

What are the performance implications of using these smart pointers?

Unique_ptr has minimal overhead, shared_ptr has more overhead due to reference counting, and weak_ptr has the least overhead but requires a shared_ptr to manage the object.

Are there any scenarios where using raw pointers is better?

Yes, raw pointers can be more efficient in scenarios where you need to manage memory manually or when performance is critical, but they come with risks like memory leaks and dangling pointers.