Is it possible to remove elements from an std::unordered_set through bucket iterators?

Question

Like the question says, can you remove an element from a std::unordered_set using a bucket iterator (local_iterator)? I can see two possible solutions:

• Since erase() does only accept global iterators, is there equivalent functionality for local_iterator?
• Is it possible to obtain the equivalent global iterator for a local_iterator?

If it's not feasible, please elaborate on why it's not.

Answer 1

The obvious answer is no, since there is no function in the interface which supports this. There is also no way to get to an iterator from a local_iterator, for the obvious reason that a local_iterator contains a lot less information. (For most implementations, I suspect that it would be fairly simple to implement erase( local_iterator ), had the standard required it. On the other hand, I can't think of a conceivable use for it, which may be why the standard didn't require it.)