Is it safe to call size on a std container from another thread?
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18-06-2021 - |
Question
When one thread manages an std::map
adding and removing things, may another thread safely call size()
on the map
?
Since there are no iterators involved, invalidation is not an issue.
In this case, I suppose the map is always alive. No object-destruction-at-a-bad-moment issues.
Solution
No. Size may involve traversal as it is not guaranteed to be O(1).
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