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// void swap(unique_lock& u); 17 18#include <mutex> 19#include <cassert> 20 21struct mutex 22{ 23 void lock() {} 24 void unlock() {} 25}; 26 27mutex m; 28 29int main() 30{ 31 std::unique_lock<mutex> lk1(m); 32 std::unique_lock<mutex> lk2; 33 lk1.swap(lk2); 34 assert(lk1.mutex() == nullptr); 35 assert(lk1.owns_lock() == false); 36 assert(lk2.mutex() == &m); 37 assert(lk2.owns_lock() == true); 38} 39