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RefCounted.h
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1/*
2 * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20
21#ifndef RefCounted_h
22#define RefCounted_h
23
24#include <wtf/Assertions.h>
25#include <wtf/Noncopyable.h>
26
27namespace WTF {
28
29template<class T> class RefCounted : Noncopyable {
30public:
31 RefCounted(int initialRefCount = 1)
32 : m_refCount(initialRefCount)
33#ifndef NDEBUG
34 , m_deletionHasBegun(false)
35#endif
36 {
37 }
38
39 void ref()
40 {
41 ASSERT(!m_deletionHasBegun);
42 ++m_refCount;
43 }
44
45 void deref()
46 {
47 ASSERT(!m_deletionHasBegun);
48 ASSERT(m_refCount > 0);
49 if (m_refCount == 1) {
50#ifndef NDEBUG
51 m_deletionHasBegun = true;
52#endif
53 delete static_cast<T*>(this);
54 } else
55 --m_refCount;
56 }
57
58 bool hasOneRef()
59 {
60 ASSERT(!m_deletionHasBegun);
61 return m_refCount == 1;
62 }
63
64 int refCount() const
65 {
66 return m_refCount;
67 }
68
69private:
70 int m_refCount;
71#ifndef NDEBUG
72 bool m_deletionHasBegun;
73#endif
74};
75
76} // namespace WTF
77
78using WTF::RefCounted;
79
80#endif // RefCounted_h
Assertions.h
ASSERT
#define ASSERT(x)
Definition: Assertions.h:33
Noncopyable.h
WTFNoncopyable::Noncopyable
Definition: Noncopyable.h:32
WTF::RefCounted
Definition: RefCounted.h:29
WTF::RefCounted::refCount
int refCount() const
Definition: RefCounted.h:64
WTF::RefCounted::deref
void deref()
Definition: RefCounted.h:45
WTF::RefCounted::ref
void ref()
Definition: RefCounted.h:39
WTF::RefCounted::RefCounted
RefCounted(int initialRefCount=1)
Definition: RefCounted.h:31
WTF::RefCounted::hasOneRef
bool hasOneRef()
Definition: RefCounted.h:58
WTF
Definition: ASCIICType.h:45
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