text: //===----------------------------------------------------------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is dual licensed under the MIT and the University of Illinois Open
  // Source Licenses. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  //
  // UNSUPPORTED: libcpp-has-no-threads
  
  // <thread>
  
  // class thread
  
  // thread& operator=(thread&& t);
  
  #include <thread>
  #include <cassert>
  
  class G
  {
      int alive_;
  public:
      static int n_alive;
      static bool op_run;
  
      G() : alive_(1) {++n_alive;}
      G(const G& g) : alive_(g.alive_) {++n_alive;}
      ~G() {alive_ = 0; --n_alive;}
  
      void operator()(int i, double j)
      {
          assert(alive_ == 1);
          assert(n_alive >= 1);
          assert(i == 5);
          assert(j == 5.5);
          op_run = true;
      }
  };
  
  int G::n_alive = 0;
  bool G::op_run = false;
  
  int main()
  {
  #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
      {
          assert(G::n_alive == 0);
          assert(!G::op_run);
          {
          G g;
          std::thread t0(g, 5, 5.5);
          std::thread::id id = t0.get_id();
          std::thread t1;
          t1 = std::move(t0);
          assert(t1.get_id() == id);
          assert(t0.get_id() == std::thread::id());
          t1.join();
          }
          assert(G::n_alive == 0);
          assert(G::op_run);
      }
  #endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
  }
  