1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef CheckedBoolean_h
27#define CheckedBoolean_h
28
29#include <wtf/Assertions.h>
30
31class CheckedBoolean {
32public:
33#if !ASSERT_DISABLED
34 CheckedBoolean(const CheckedBoolean& other)
35 : m_value(other.m_value)
36 , m_checked(false)
37 {
38 other.m_checked = true;
39 }
40#endif
41
42 CheckedBoolean(bool value)
43 : m_value(value)
44#if !ASSERT_DISABLED
45 , m_checked(false)
46#endif
47 {
48 }
49
50 ~CheckedBoolean()
51 {
52 ASSERT(m_checked);
53 }
54
55 operator bool()
56 {
57#if !ASSERT_DISABLED
58 m_checked = true;
59#endif
60 return m_value;
61 }
62
63private:
64 bool m_value;
65#if !ASSERT_DISABLED
66 mutable bool m_checked;
67#endif
68};
69
70#endif
71