Does weak_ptr work alongside unique_ptr?

Question

As I understand it, a std::weak_ptr is used as a safe way of referencing memory referenced by a std::shared_ptr which may have been deallocated. Can it be used with a std::unique_ptr as well?

Answer 1

As I understand it std::weak_ptr is used as a safe way of referencing memory referenced by shared_ptrs which may have been deallocated.

You understand wrong. std::weak_ptr allowes to access object, which ownership is maintained by std::shared_ptr without sharing it. Now when you really understand what std::weak_ptr does you should understand that your question about std::unique_ptr does not make any sense.