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I learnt a lot about weak_ptr working with share_ptr to break cyclic reference. How does it work? How to use that? Can any body give me an example? I am totally lost here.
One more question, what’s a strong pointer?
It is not included in the reference count, so the resource can be freed even when weak pointers exist. When using a weak_ptr, you acquire a shared_ptr from it, temporarily increasing the reference count. If the resource has already been freed, acquiring the shared_ptr will fail.
Q2: shared_ptr is a strong pointer. As long as any of them exist, the resource cannot be freed.