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 <jwakely@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.
34e9407b3b