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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.
//
//===----------------------------------------------------------------------===//
// <mutex>
// template <class Mutex> class unique_lock;
// template <class Mutex>
// void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y);
#include <mutex>
#include <cassert>
struct mutex
{
void lock() {}
void unlock() {}
};
mutex m;
int main()
{
std::unique_lock<mutex> lk1(m);
std::unique_lock<mutex> lk2;
swap(lk1, lk2);
assert(lk1.mutex() == nullptr);
assert(lk1.owns_lock() == false);
assert(lk2.mutex() == &m);
assert(lk2.owns_lock() == true);
}
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