1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// UNSUPPORTED: libcpp-has-no-threads 11 12// <mutex> 13 14// template <class Mutex> class unique_lock; 15 16// template <class Mutex> 17// void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y); 18 19#include <mutex> 20#include <cassert> 21 22struct mutex 23{ 24 void lock() {} 25 void unlock() {} 26}; 27 28mutex m; 29 30int main() 31{ 32 std::unique_lock<mutex> lk1(m); 33 std::unique_lock<mutex> lk2; 34 swap(lk1, lk2); 35 assert(lk1.mutex() == nullptr); 36 assert(lk1.owns_lock() == false); 37 assert(lk2.mutex() == &m); 38 assert(lk2.owns_lock() == true); 39} 40