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// <mutex> 11 12// template <class Mutex> class unique_lock; 13 14// template <class Mutex> 15// void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y); 16 17#include <mutex> 18#include <cassert> 19 20struct mutex 21{ 22 void lock() {} 23 void unlock() {} 24}; 25 26mutex m; 27 28int main() 29{ 30 std::unique_lock<mutex> lk1(m); 31 std::unique_lock<mutex> lk2; 32 swap(lk1, lk2); 33 assert(lk1.mutex() == nullptr); 34 assert(lk1.owns_lock() == false); 35 assert(lk2.mutex() == &m); 36 assert(lk2.owns_lock() == true); 37} 38