François Dumont 33a1e511b5 libstdc++: Make deque iterator operator- usable with value-init iterators ... N3644 implies that operator- can be used on value-init iterators. We now return 0 if both iterators are value initialized. If only one is value initialized we keep the UB by returning the result of a normal computation which is a meaningless value. libstdc++-v3/ChangeLog: PR libstdc++/70303 * include/bits/stl_deque.h (std::deque<>::operator-(iterator, iterator)): Return 0 if both iterators are value-initialized. * testsuite/23_containers/deque/70303.cc: New test. * testsuite/23_containers/vector/70303.cc: New test.		2021-02-01 19:19:53 +01:00
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stl_deque.h	libstdc++: Make deque iterator operator- usable with value-init iterators	2021-02-01 19:19:53 +01:00
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