[Solved] discussion about the scenarios that the insertion function of an STL vector may not work [closed]

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I can only assume that a side effect of calculateSomeValue() is changing a which invalidates all iterators.

Since the order of evaluation of arguments in a.insert(a.begin(), calculateSomeValue()); is unspecified it could be that a.begin() is evaluated before calculateSomeValue() invalidates all iterators to a. Which is undefined behaviour.

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solved discussion about the scenarios that the insertion function of an STL vector may not work [closed]