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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// <mutex>
// template <class Mutex> class unique_lock;
// explicit operator bool() const noexcept;
#include <mutex>
#include <cassert>
#include <type_traits>
#include "test_macros.h"
std::mutex m;
int main(int, char**)
{
static_assert(std::is_constructible<bool, std::unique_lock<std::mutex> >::value, "");
static_assert(!std::is_convertible<std::unique_lock<std::mutex>, bool>::value, "");
std::unique_lock<std::mutex> lk0;
assert(static_cast<bool>(lk0) == false);
std::unique_lock<std::mutex> lk1(m);
assert(static_cast<bool>(lk1) == true);
lk1.unlock();
assert(static_cast<bool>(lk1) == false);
ASSERT_NOEXCEPT(static_cast<bool>(lk0));
return 0;
}
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