1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003, 2005, 2008 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef DataRef_h
#define DataRef_h
#include <wtf/RefPtr.h>
namespace WebCore {
template <typename T> class DataRef {
public:
const T* get() const { return m_data.get(); }
const T& operator*() const { return *get(); }
const T* operator->() const { return get(); }
T* access()
{
if (!m_data->hasOneRef())
m_data = m_data->copy();
return m_data.get();
}
void init()
{
ASSERT(!m_data);
m_data = T::create();
}
bool operator==(const DataRef<T>& o) const
{
ASSERT(m_data);
ASSERT(o.m_data);
return m_data == o.m_data || *m_data == *o.m_data;
}
bool operator!=(const DataRef<T>& o) const
{
ASSERT(m_data);
ASSERT(o.m_data);
return m_data != o.m_data && *m_data != *o.m_data;
}
// Template helps us to write the implementation without MemoryInstrumentation.h include.
template<typename MemoryObjectInfo>
void reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
{
typename MemoryObjectInfo::ClassInfo info(memoryObjectInfo, this);
info.addMember(m_data);
}
private:
RefPtr<T> m_data;
};
} // namespace WebCore
#endif // DataRef_h
|
