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Subject: [Bug libstdc++/105505] P1951R1 (Default Arguments for pair's
 Forwarding Constructor) is unimplemented
Date: Fri, 12 Jan 2024 09:48:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105505

--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:35f8c661d67f53486f2f3e25887323476a7d0c2b

commit r14-7173-g35f8c661d67f53486f2f3e25887323476a7d0c2b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Jan 11 22:38:02 2024 +0000

    libstdc++: Implement C++23 P1951R1 (Default Args for pair's Forwarding
Ctor) [PR105505]

    This was approved for C++23 at he June 2021 virtual meeting.

    This allows more efficient construction of std::pair members when {} is
    used as a constructor argument. The perfect forwarding constructor can
    be used, so that the member variables are constructed from forwarded
    arguments instead of being copy constructed from temporaries.

    libstdc++-v3/ChangeLog:

            PR libstdc++/105505
            * include/bits/stl_pair.h (pair::pair(U1&&, U2&&)) [C++23]: Add
            default template arguments, as per P1951R1.
            * testsuite/20_util/pair/cons/default_tmpl_args.cc: New test.=