[Bug libstdc++/109242] C++2b std::optional::transform omits required std::remove_cv_t from return optional type

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109242

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:82e8d1685a1e5fac4880e987ed9684248378bce2

commit r12-9369-g82e8d1685a1e5fac4880e987ed9684248378bce2
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Mar 29 22:16:55 2023 +0100

    libstdc++: Use std::remove_cv_t in std::optional::transform [PR109242]

    We need to strip cv-qualifiers from the result of the callable passed to
    std::optional::transform.

    libstdc++-v3/ChangeLog:

            PR libstdc++/109242
            * include/std/optional (transform): Use std::remove_cv_t.
            * testsuite/20_util/optional/monadic/pr109242.cc: New test.

    (cherry picked from commit 31a909712014b75fc6ae2ca5eaa425f218bb5f32)