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