Function thread

extern/boost/boost/thread/detail/thread.hpp:264–270

          class F
        >
        explicit thread(BOOST_THREAD_RV_REF(F) f
        //, typename disable_if<is_same<typename decay<F>::type, thread>, dummy* >::type=0
        ):
          thread_info(make_thread_info(thread_detail::decay_copy(boost::forward<F>(f))))
        {
            start_thread();
        }
        template <
          class F
        >