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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2008 Collabora Ltd.
* Copyright (C) 2009 Martin Robinson
*
* 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 PlatformRefPtr_h
#define PlatformRefPtr_h
#include "AlwaysInline.h"
#include "RefPtr.h"
#include <algorithm>
namespace WTF {
enum PlatformRefPtrAdoptType { PlatformRefPtrAdopt };
template <typename T> inline T* refPlatformPtr(T*);
template <typename T> inline void derefPlatformPtr(T*);
template <typename T> class PlatformRefPtr;
template <typename T> PlatformRefPtr<T> adoptPlatformRef(T*);
template <typename T> class PlatformRefPtr {
public:
PlatformRefPtr() : m_ptr(0) { }
PlatformRefPtr(T* ptr)
: m_ptr(ptr)
{
if (ptr)
refPlatformPtr(ptr);
}
PlatformRefPtr(const PlatformRefPtr& o)
: m_ptr(o.m_ptr)
{
if (T* ptr = m_ptr)
refPlatformPtr(ptr);
}
template <typename U> PlatformRefPtr(const PlatformRefPtr<U>& o)
: m_ptr(o.get())
{
if (T* ptr = m_ptr)
refPlatformPtr(ptr);
}
~PlatformRefPtr()
{
if (T* ptr = m_ptr)
derefPlatformPtr(ptr);
}
void clear()
{
T* ptr = m_ptr;
m_ptr = 0;
if (ptr)
derefPlatformPtr(ptr);
}
// Hash table deleted values, which are only constructed and never copied or destroyed.
PlatformRefPtr(HashTableDeletedValueType) : m_ptr(hashTableDeletedValue()) { }
bool isHashTableDeletedValue() const { return m_ptr == hashTableDeletedValue(); }
T* get() const { return m_ptr; }
T& operator*() const { return *m_ptr; }
ALWAYS_INLINE T* operator->() const { return m_ptr; }
bool operator!() const { return !m_ptr; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef T* PlatformRefPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &PlatformRefPtr::m_ptr : 0; }
PlatformRefPtr& operator=(const PlatformRefPtr&);
PlatformRefPtr& operator=(T*);
template <typename U> PlatformRefPtr& operator=(const PlatformRefPtr<U>&);
void swap(PlatformRefPtr&);
friend PlatformRefPtr adoptPlatformRef<T>(T*);
private:
static T* hashTableDeletedValue() { return reinterpret_cast<T*>(-1); }
// Adopting constructor.
PlatformRefPtr(T* ptr, PlatformRefPtrAdoptType) : m_ptr(ptr) {}
T* m_ptr;
};
template <typename T> inline PlatformRefPtr<T>& PlatformRefPtr<T>::operator=(const PlatformRefPtr<T>& o)
{
T* optr = o.get();
if (optr)
refPlatformPtr(optr);
T* ptr = m_ptr;
m_ptr = optr;
if (ptr)
derefPlatformPtr(ptr);
return *this;
}
template <typename T> inline PlatformRefPtr<T>& PlatformRefPtr<T>::operator=(T* optr)
{
T* ptr = m_ptr;
if (optr)
refPlatformPtr(optr);
m_ptr = optr;
if (ptr)
derefPlatformPtr(ptr);
return *this;
}
template <class T> inline void PlatformRefPtr<T>::swap(PlatformRefPtr<T>& o)
{
std::swap(m_ptr, o.m_ptr);
}
template <class T> inline void swap(PlatformRefPtr<T>& a, PlatformRefPtr<T>& b)
{
a.swap(b);
}
template <typename T, typename U> inline bool operator==(const PlatformRefPtr<T>& a, const PlatformRefPtr<U>& b)
{
return a.get() == b.get();
}
template <typename T, typename U> inline bool operator==(const PlatformRefPtr<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const PlatformRefPtr<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const PlatformRefPtr<T>& a, const PlatformRefPtr<U>& b)
{
return a.get() != b.get();
}
template <typename T, typename U> inline bool operator!=(const PlatformRefPtr<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const PlatformRefPtr<U>& b)
{
return a != b.get();
}
template <typename T, typename U> inline PlatformRefPtr<T> static_pointer_cast(const PlatformRefPtr<U>& p)
{
return PlatformRefPtr<T>(static_cast<T*>(p.get()));
}
template <typename T, typename U> inline PlatformRefPtr<T> const_pointer_cast(const PlatformRefPtr<U>& p)
{
return PlatformRefPtr<T>(const_cast<T*>(p.get()));
}
template <typename T> inline T* getPtr(const PlatformRefPtr<T>& p)
{
return p.get();
}
template <typename T> PlatformRefPtr<T> adoptPlatformRef(T* p)
{
return PlatformRefPtr<T>(p, PlatformRefPtrAdopt);
}
} // namespace WTF
using WTF::PlatformRefPtr;
using WTF::refPlatformPtr;
using WTF::derefPlatformPtr;
using WTF::adoptPlatformRef;
using WTF::static_pointer_cast;
using WTF::const_pointer_cast;
#endif // PlatformRefPtr_h
|
