[PATCH] PR libstdc++/90105 make forward_list::sort stable
Thu Apr 18 02:38:00 GMT 2019
On 16/04/19 23:16 +0100, Jonathan Wakely wrote:
>While testing the fix I also discovered that operator== assumes the
>elements are comparable with operator!= which is not required.
> PR libstdc++/90105
> * include/bits/forward_list.h (operator==): Do not use operator!= to
> compare elements.
> (forward_list<T, A>::sort(Comp)): When elements are equal take the one
> earlier in the list, so that sort is stable.
> * testsuite/23_containers/forward_list/operations/90105.cc: New test.
> * testsuite/23_containers/forward_list/comparable.cc: Test with
> types that meet the minimum EqualityComparable and LessThanComparable
> requirements. Remove irrelevant comment.
>I'm surprised nobody has noticed either of these bugs before! I think
>this is safe for stage 4, and for backporting to active branches. Any
Committed to trunk.
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