| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // UNSUPPORTED: libcpp-has-no-threads |
| // UNSUPPORTED: c++98, c++03, c++11 |
| |
| // <shared_mutex> |
| |
| // template <class Mutex> class shared_lock; |
| |
| // template <class Mutex> |
| // void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept; |
| |
| #include <shared_mutex> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| |
| struct mutex |
| { |
| void lock_shared() {} |
| void unlock_shared() {} |
| }; |
| |
| mutex m; |
| |
| int main(int, char**) |
| { |
| std::shared_lock<mutex> lk1(m); |
| std::shared_lock<mutex> lk2; |
| swap(lk1, lk2); |
| assert(lk1.mutex() == nullptr); |
| assert(lk1.owns_lock() == false); |
| assert(lk2.mutex() == &m); |
| assert(lk2.owns_lock() == true); |
| static_assert(noexcept(swap(lk1, lk2)), "non-member swap must be noexcept"); |
| |
| return 0; |
| } |