7453376403
This change avoids storing a copy of a stop_token object that isn't needed and won't be passed to the callable object. This slightly reduces memory usage when the callable doesn't use a stop_token. It also removes indirection in the invocation of the callable in the new thread, as there is no lambda and no additional calls to std::invoke. It also adds some missing [[nodiscard]] attributes, and the non-member swap overload for std::jthread. * include/std/thread (jthread::jthread()): Use nostopstate constant. (jthread::jthread(Callable&&, Args&&...)): Use helper function to create std::thread instead of indirection through a lambda. Use remove_cvref_t instead of decay_t. (jthread::joinable(), jthread::get_id(), jthread::native_handle()) (jthread::hardware_concurrency()): Add nodiscard attribute. (swap(jthread&. jthread&)): Define hidden friend. (jthread::_S_create): New helper function for constructor. From-SVN: r278364
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