| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // UNSUPPORTED: no-threads |
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| 10 | // UNSUPPORTED: c++03, c++11 |
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| 11 | |
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| 12 | // <shared_mutex> |
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| 13 | |
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| 14 | // template <class Mutex> class shared_lock; |
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| 15 | |
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| 16 | // template <class Mutex> |
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| 17 | // void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept; |
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| 18 | |
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| 19 | #include <shared_mutex> |
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| 20 | #include <cassert> |
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| 21 | |
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| 22 | #include "test_macros.h" |
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| 23 | |
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| 24 | struct mutex |
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| 25 | { |
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| 26 | void lock_shared() {} |
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| 27 | void unlock_shared() {} |
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| 28 | }; |
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| 29 | |
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| 30 | mutex m; |
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| 31 | |
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| 32 | int main(int, char**) |
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| 33 | { |
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| 34 | std::shared_lock<mutex> lk1(m); |
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| 35 | std::shared_lock<mutex> lk2; |
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| 36 | swap(lk1, lk2); |
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| 37 | assert(lk1.mutex() == nullptr); |
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| 38 | assert(lk1.owns_lock() == false); |
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| 39 | assert(lk2.mutex() == &m); |
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| 40 | assert(lk2.owns_lock() == true); |
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| 41 | static_assert(noexcept(swap(lk1, lk2)), "non-member swap must be noexcept" ); |
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| 42 | |
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| 43 | return 0; |
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| 44 | } |
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| 45 | |
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