44 lines
1.0 KiB
C++
44 lines
1.0 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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// <shared_mutex>
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// template <class Mutex> class shared_lock;
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// void swap(shared_lock& u) 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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lk1.swap(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(lk1.swap(lk2)), "member swap must be noexcept");
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#endif // _LIBCPP_STD_VER > 11
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}
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