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Subject: [Bug libstdc++/103501] associative containers left invalid after
 allocator-extended move construction
Date: Wed, 15 Jun 2022 08:14:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103501

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:d4fdb293004f2e104edf823d4820d4ee73aa2660

commit r10-10837-gd4fdb293004f2e104edf823d4820d4ee73aa2660
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Nov 30 23:32:50 2021 +0000

    libstdc++: Clear RB tree after moving elements [PR103501]

    If the allocator-extended move constructor move-constructs each element
    into the new container, the contents of the old container are left in
    moved-from states. We cannot know if those states preserve the
    container's ordering and uniqueness guarantees, so just erase all
    moved-from elements.

    libstdc++-v3/ChangeLog:

            PR libstdc++/103501
            * include/bits/stl_tree.h (_Rb_tree(_Rb_tree&&, false_type)):
            Clear container if elements have been moved-from.
            * testsuite/23_containers/multiset/allocator/103501.cc: New tes=
t.
            * testsuite/23_containers/set/allocator/103501.cc: New test.

    (cherry picked from commit 056551414a328b427c4bf4955b9a3832f344685c)=