Quick Q: Simultaneously iterating over and modifying an unordered_set? -- StackOverflow

From StackOverflow [c++11]:

Consider the following code:

unordered_set<T> S = ...;
for (const auto& x : S)
   if (...)

This is broken correct? If we insert something into S then the iterators may be invalidated (due to a rehash), which will break the range-for because under the hood it is using S.begin ... S.end.

Is there some pattern to deal with this?

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