libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.mod/nonmember_swap.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // UNSUPPORTED: no-threads
  10
  11 // <mutex>
  12
  13 // template <class Mutex> class unique_lock;
  14
  15 // template <class Mutex>
  16 //   void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y);
  17
  18 #include <mutex>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22
  23 struct mutex
  24 {
  25     void lock() {}
  26     void unlock() {}
  27 };
  28
  29 mutex m;
  30
  31 int main(int, char**)
  32 {
  33     std::unique_lock<mutex> lk1(m);
  34     std::unique_lock<mutex> lk2;
  35     swap(lk1, lk2);
  36     assert(lk1.mutex() == nullptr);
  37     assert(lk1.owns_lock() == false);
  38     assert(lk2.mutex() == &m);
  39     assert(lk2.owns_lock() == true);
  40
  41   return 0;
  42 }