https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84535
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Thu May 3 14:08:36 2018 New Revision: 259893 URL: https://gcc.gnu.org/viewcvs?rev=259893&root=gcc&view=rev Log: PR libstdc++/84535 constrain std::thread constructor The standard requires that the std::thread constructor is constrained so it can't be called with a first argument of type std::thread. The current implementation only meets that requirement if the constructor is called with one argument, by using deleted overloads. This uses an enable_if constraint to enforce the requirement for any number of arguments. Also add a static assertion to give a more readable error for invalid arguments that cannot be invoked. Also simplify _Invoker to reduce the error cascade for ill-formed instantiations with non-invocable arguments. PR libstdc++/84535 * include/std/thread (thread::__not_same): New SFINAE helper. (thread::thread(_Callable&&, _Args&&...)): Add SFINAE constraint that first argument is not a std::thread. Add static assertion to check INVOKE expression is valid. (thread::thread(thread&), thread::thread(const thread&&)): Remove. (thread::_Invoke::_M_invoke, thread::_Invoke::operator()): Use __invoke_result for return types and remove exception specifications. * testsuite/30_threads/thread/cons/84535.cc: New. Added: trunk/libstdc++-v3/testsuite/30_threads/thread/cons/84535.cc Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/std/thread
