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      1 //===----------------------------------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is dual licensed under the MIT and the University of Illinois Open
      6 // Source Licenses. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 
     10 // <mutex>
     11 
     12 // template <class Mutex> class unique_lock;
     13 
     14 // unique_lock& operator=(unique_lock const&) = delete;
     15 
     16 #include <mutex>
     17 #include <cassert>
     18 
     19 std::mutex m0;
     20 std::mutex m1;
     21 
     22 int main()
     23 {
     24     std::unique_lock<std::mutex> lk0(m0);
     25     std::unique_lock<std::mutex> lk1(m1);
     26     lk1 = lk0;
     27     assert(lk1.mutex() == &m0);
     28     assert(lk1.owns_lock() == true);
     29     assert(lk0.mutex() == nullptr);
     30     assert(lk0.owns_lock() == false);
     31 }
     32