a90c6dd460
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
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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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// template <class Mutex>
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// void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;
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#include <shared_mutex>
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#include <cassert>
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#if _LIBCPP_STD_VER > 11
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struct mutex
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{
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void lock_shared() {}
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void unlock_shared() {}
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};
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mutex m;
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#endif // _LIBCPP_STD_VER > 11
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int main()
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{
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#if _LIBCPP_STD_VER > 11
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std::shared_lock<mutex> lk1(m);
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std::shared_lock<mutex> lk2;
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swap(lk1, lk2);
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assert(lk1.mutex() == nullptr);
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assert(lk1.owns_lock() == false);
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assert(lk2.mutex() == &m);
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assert(lk2.owns_lock() == true);
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static_assert(noexcept(swap(lk1, lk2)), "non-member swap must be noexcept");
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#endif // _LIBCPP_STD_VER > 11
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}
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