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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;
// mutex_type* release() noexcept;
#include <shared_mutex>
#include <cassert>
#if _LIBCPP_STD_VER > 11
struct mutex
{
static int lock_count;
static int unlock_count;
void lock_shared() {++lock_count;}
void unlock_shared() {++unlock_count;}
};
int mutex::lock_count = 0;
int mutex::unlock_count = 0;
mutex m;
#endif // _LIBCPP_STD_VER > 11
int main()
{
#if _LIBCPP_STD_VER > 11
std::shared_lock<mutex> lk(m);
assert(lk.mutex() == &m);
assert(lk.owns_lock() == true);
assert(mutex::lock_count == 1);
assert(mutex::unlock_count == 0);
assert(lk.release() == &m);
assert(lk.mutex() == nullptr);
assert(lk.owns_lock() == false);
assert(mutex::lock_count == 1);
assert(mutex::unlock_count == 0);
static_assert(noexcept(lk.release()), "release must be noexcept");
#endif // _LIBCPP_STD_VER > 11
}
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