How to iterate over a container in a thread-safe way?

Sounds like a reader/writer lock is needed. Basically, the idea is that you may have 1 or more readers OR a single writer. Never can you have a read and write lock at the same time.

IMHO it is a mistake to have a private mutex in a data structure class and then write the class methods so that the whole thing is thread safe no matter what the code that calls the methods does. The complexity that is required to do this completely and perfectly is way over the top.

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