//===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // <mutex> // template <class Mutex> class unique_lock; // unique_lock(mutex_type& m, defer_lock_t); #include <mutex> #include <cassert> int main() { std::mutex m; std::unique_lock<std::mutex> lk(m, std::defer_lock); assert(lk.mutex() == &m); assert(lk.owns_lock() == false); }