libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex.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 // <mutex>
  10
  11 // template <class Mutex> class unique_lock;
  12
  13 // explicit unique_lock(mutex_type& m);
  14
  15 // template<class _Mutex> unique_lock(unique_lock<_Mutex>)
  16 //     -> unique_lock<_Mutex>;  // C++17
  17
  18 #include <cassert>
  19 #include <mutex>
  20
  21 #include "checking_mutex.h"
  22 #include "test_macros.h"
  23
  24 int main(int, char**) {
  25   checking_mutex mux;
  26
  27   {
  28     std::unique_lock<checking_mutex> lock(mux);
  29     assert(mux.current_state == checking_mutex::locked_via_lock);
  30   }
  31   assert(mux.current_state == checking_mutex::unlocked);
  32
  33 #if TEST_STD_VER >= 17
  34   static_assert(std::is_same_v<std::unique_lock<checking_mutex>, decltype(std::unique_lock{mux})>, "");
  35 #endif
  36
  37   return 0;
  38 }