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