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 they should be used, creating circular references, and misunderstanding ownership semantics.

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 smart pointers with arrays?

Using std::unique_ptr with arrays requires the use of std::unique_ptr<Type[]> to ensure proper deletion. Avoid using std::shared_ptr with arrays.

Are there any performance issues I should be aware of?

Yes, while smart pointers manage memory automatically, they can introduce overhead due to reference counting in std::shared_ptr. Use std::unique_ptr when possible for better performance.