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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03, c++11
// <shared_mutex>
// template <class Mutex> class shared_lock;
// void swap(shared_lock& u) noexcept;
#include <shared_mutex>
#include <cassert>
struct mutex
{
void lock_shared() {}
void unlock_shared() {}
};
mutex m;
int main()
{
std::shared_lock<mutex> lk1(m);
std::shared_lock<mutex> lk2;
lk1.swap(lk2);
assert(lk1.mutex() == nullptr);
assert(lk1.owns_lock() == false);
assert(lk2.mutex() == &m);
assert(lk2.owns_lock() == true);
static_assert(noexcept(lk1.swap(lk2)), "member swap must be noexcept");
}
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