libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.unique/thread.lock.unique.cons/mutex_defer_lock.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 // unique_lock(mutex_type& m, defer_lock_t);
  14
  15 #include <cassert>
  16 #include <memory>
  17 #include <mutex>
  18 #include <type_traits>
  19
  20 #include "checking_mutex.h"
  21 #include "test_macros.h"
  22
  23 #if TEST_STD_VER >= 11
  24 static_assert(
  25     std::is_nothrow_constructible<std::unique_lock<checking_mutex>, checking_mutex&, std::defer_lock_t>::value, "");
  26 #endif
  27
  28 int main(int, char**) {
  29   checking_mutex m;
  30   std::unique_lock<checking_mutex> lk(m, std::defer_lock_t());
  31   assert(m.last_try == checking_mutex::none);
  32   assert(lk.mutex() == std::addressof(m));
  33   assert(lk.owns_lock() == false);
  34
  35   return 0;
  36 }