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 21 struct mutex 22 { 23 void lock() {} 24 void unlock() {} 25 }; 26 27 mutex m; 28 29 int 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
