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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.
//
//===----------------------------------------------------------------------===//
// <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>
#if _LIBCPP_STD_VER > 11
struct mutex
{
void lock_shared() {}
void unlock_shared() {}
};
mutex m;
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
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");
#endif // _LIBCPP_STD_VER > 11
}
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