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C++03 Standard § 23.2.4.3/3 describes std::vector::erase(iterator position) and says specifically
Invalidates all the iterators and references after the point of the erase.
Is the iterator at the point of the erase not invalidated? Specifically if I have a vector with a single element and I copy begin() iterator into a local variable and then call
vec.erase(vec.begin())
Will that iterator I have in a local variable get invalidated or not?
Will the iterators be invalidated after the point of erasure or after and including the point of erasure?
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Every iterator and reference after the point of erasing is invalidated. Only the iterators and references to the erased element is invalidated.
To avoid invalidation of references to elements you can use a std::deque if you do not insert or erase in the middle. To avoid invalidation of iterators you can use a std::list.
No, they should not get invalidated after a move operation.
No. That's implied by the fact that iterators, pointers and references prior to the point of erase remain valid. Reducing the capacity would require a reallocation.
I'd say that your example with erasing the only element in the vector shows that the iterator at the insertion point must be invalidated.
Anyway, in C++11, the wording has been changed (23.3.6.5/3):
Effects: Invalidates iterators and references at or after the point of the erase.
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