[PATCH] Reorder std::scoped_lock parameters as per P0739R0 DR status

[Ville Voutilainen]

On 15 July 2017 at 18:48, Jonathan Wakely <jwakely@redhat.com> wrote:
> WG21 just approved this change as a DR for C++17, so that class
> template argument deduction works when using std::adopt_lock with a
> std::scoped_lock.
>
>         * include/std/mutex (scoped_lock): Reorder std::adopt_lock_t
> parameter
>         as per P0739R0.
>         * testsuite/30_threads/scoped_lock/cons/1.cc: Reorder arguments.
>         * testsuite/30_threads/scoped_lock/cons/deduction.cc: Test deduction
>         with std::adopt_lock_t.
>         * testsuite/30_threads/scoped_lock/requirements/typedefs.cc: Check
>         feature-test macro.
>
> Tested powerpc64le-linux, committed to trunk.
>
> I think we should also make this change and the r250213 one to
> std::variant (which is in the same paper) on gcc-7-branch.


Aye - it doesn't seem sensible to keep the old semantics, our
C++17-support is fairly
fresh.