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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03, c++11
// <shared_mutex>
// template <class Mutex> class shared_lock;
// explicit operator bool() const noexcept;
#include <shared_mutex>
#include <cassert>
std::shared_timed_mutex m;
int main()
{
std::shared_lock<std::shared_timed_mutex> lk0;
assert(static_cast<bool>(lk0) == false);
std::shared_lock<std::shared_timed_mutex> lk1(m);
assert(static_cast<bool>(lk1) == true);
lk1.unlock();
assert(static_cast<bool>(lk1) == false);
static_assert(noexcept(static_cast<bool>(lk0)), "explicit operator bool() must be noexcept");
}
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