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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/112477] [13/14 Regression] Assignment of
 value-initialized iterators differs from value-initialization
Date: Thu, 11 Jan 2024 20:55:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112477

--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Francois Dumont
<fdumont@gcc.gnu.org>:

https://gcc.gnu.org/g:ffc5684a4d3d3c457e5d311e7088f3487cf5083e

commit r13-8212-gffc5684a4d3d3c457e5d311e7088f3487cf5083e
Author: Fran=C3=A7ois Dumont <fdumont@gcc.gnu.org>
Date:   Wed Jan 10 19:06:48 2024 +0100

    libstdc++: [_GLIBCXX_DEBUG] Fix assignment of value-initialized iterator
[PR112477]

    Now that _M_Detach do not reset iterator _M_version value we need to re=
set
it when
    the iterator is attached to a new sequence. Even if this sequence is nu=
ll
like when
    assigning a value-initialized iterator. In this case _M_version shall be
reset to 0.

    libstdc++-v3/ChangeLog:

            PR libstdc++/112477
            * src/c++11/debug.cc
            (_Safe_iterator_base::_M_attach): Reset _M_version to 0 if
attaching to null
            sequence.
            (_Safe_iterator_base::_M_attach_single): Likewise.
            (_Safe_local_iterator_base::_M_attach): Likewise.
            (_Safe_local_iterator_base::_M_attach_single): Likewise.
            * testsuite/23_containers/map/debug/112477.cc: New test case.

    Reviewed-by: Jonathan Wakely <jwakely@redhat.com>=