[Bug libstdc++/100612] std::jthread can't be initialized with a pointer to a member function taking a std::stop_token

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100612

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

https://gcc.gnu.org/g:34e9407b3b4298bd587e0df2e0047679019b66cf

commit r12-4081-g34e9407b3b4298bd587e0df2e0047679019b66cf
Author: Jonathan Wakely <jwak...@redhat.com>
Date:   Thu May 20 22:36:16 2021 +0100

    libstdc++: Make std::jthread support pointers to member functions [PR
100612]

    This adds a non-standard extension to support initializing a
    std::jthread with a pointer to a member function that expects a
    stop_token to be added to the arguments. That use case is not supported
    by C++20, because the stop_token would get added as the first argument,
    which is where the object argument needs to be to invoke a pointer to
    member function.

    Signed-off-by: Jonathan Wakely <jwak...@redhat.com>

    libstdc++-v3/ChangeLog:

            PR libstdc++/100612
            * include/std/thread (__pmf_expects_stop_token): New variable
            template to detect a pointer to member function that needs a
            stop_token to be added to the arguments.
            (jthread::__S_create): Use __pmf_expects_stop_token.
            (jthread::__S_create_pmf): New function.
            * testsuite/30_threads/jthread/100612.cc: New test.