What are some common mistakes when using smart pointers in C++?

What are some common mistakes when using smart pointers in C++?

Some common mistakes include not using smart pointers when needed, circular references, and improper ownership management.

Can you explain circular references and how to avoid them?

Circular references occur when two or more smart pointers reference each other, preventing memory from being freed. To avoid this, use std::weak_ptr for one of the pointers.

What about using shared_ptr instead of unique_ptr?

Using shared_ptr when unique_ptr suffices can lead to unnecessary overhead and complexity. Prefer unique_ptr for sole ownership.

Are there any performance implications of using smart pointers?

Yes, smart pointers can introduce overhead due to reference counting and additional memory allocations, so use them judiciously.