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 // Copyright (C) 2011 Vicente J. Botet Escriba
11 //
12 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
13 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
14 
15 // <boost/thread/locks.hpp>
16 
17 // template <class Mutex> class unique_lock;
18 
19 // explicit operator bool() const;
20 
21 #include <boost/thread/lock_types.hpp>
22 #include <boost/thread/mutex.hpp>
23 #include <boost/detail/lightweight_test.hpp>
24 
25 boost::mutex m;
26 
main()27 int main()
28 {
29   {
30     boost::unique_lock<boost::mutex> lk0;
31     BOOST_TEST(bool(lk0) == false);
32     boost::unique_lock<boost::mutex> lk1(m);
33     BOOST_TEST(bool(lk1) == true);
34     lk1.unlock();
35     BOOST_TEST(bool(lk1) == false);
36   }
37 
38   {
39     boost::unique_lock<boost::mutex> lk0;
40     if (lk0) BOOST_TEST(false);
41     boost::unique_lock<boost::mutex> lk1(m);
42     if (!lk1) BOOST_TEST(false);
43     lk1.unlock();
44     if (lk1) BOOST_TEST(false);
45   }
46   return boost::report_errors();
47 }
48 
49