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I mistakenly took the address of the reference returned by the back() operator in an empty container and was surprised to see that the address wasn’t zero.
If a container e.g. std::deque is empty, what does back() return?
it returns the last element.
on this page: http://www.sgi.com/tech/stl/BackInsertionSequence.html
precondition: !a.empty()
Equivalent to *(–a.end()).
since the precondition is the deque is not empty, then it means it’s undefined behavior.