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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
/* This file is part of the KDE project
*
* Copyright (C) 2004 Koos Vriezen <[email protected]>
*
* 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 Steet, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* until boost gets common, a more or less compatable one ..
*/
#ifndef _SHAREDPTR_H_
#define _SHAREDPTR_H_
//#define SHAREDPTR_DEBUG
#ifdef SHAREDPTR_DEBUG
extern int shared_data_count;
#include <iostream>
#endif
namespace KMPlayer {
/**
* Shared data for SharedPtr and WeakPtr objects.
**/
template <class T>
struct SharedData {
SharedData (T * t, bool w) : use_count (w?0:1), weak_count (1), ptr (t) {
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::SharedData use:" << use_count << " weak:" << weak_count << " total:" << ++shared_data_count << std::endl;
#endif
}
#ifdef SHAREDPTR_DEBUG
~SharedData () { std::cerr << "SharedData::~SharedData" << " total:" << --shared_data_count << std::endl; }
#endif
void addRef ();
void addWeakRef ();
void release ();
void releaseWeak ();
void dispose ();
int use_count;
int weak_count;
T * ptr;
};
template <class T> inline void SharedData<T>::addRef () {
use_count++;
weak_count++;
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::addRef use:" << use_count << " weak:" << weak_count << std::endl;
#endif
}
template <class T> inline void SharedData<T>::addWeakRef () {
weak_count++;
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::addWeakRef use:" << use_count << " weak:" << weak_count << std::endl;
#endif
}
template <class T> inline void SharedData<T>::releaseWeak () {
ASSERT (weak_count > 0 && weak_count > use_count);
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::releaseWeak use:" << use_count << " weak:" << weak_count-1 << std::endl;
#endif
if (--weak_count <= 0) delete this;
}
template <class T> inline void SharedData<T>::release () {
ASSERT (use_count > 0);
if (--use_count <= 0) dispose ();
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::release use:" << use_count << " weak:" << weak_count << std::endl;
#endif
releaseWeak ();
}
template <class T> inline void SharedData<T>::dispose () {
ASSERT (use_count == 0);
#ifdef SHAREDPTR_DEBUG
std::cerr << "SharedData::dispose use:" << use_count << " weak:" << weak_count << std::endl;
#endif
delete ptr;
ptr = 0;
}
template <class T> struct WeakPtr;
/**
* Shared class based on boost shared
* This makes it possible to share pointers w/o having to worry about
* memory leaks. A pointer gets deleted as soon as the last Shared pointer
* gets destroyed. As such, never use (or be extremely carefull) not to
* use pointers or references to shared objects
**/
template <class T>
struct SharedPtr {
SharedPtr () : data (0L) {};
SharedPtr (T *t) : data (t ? new SharedData<T> (t, false) : 0L) {}
SharedPtr (const SharedPtr<T> & s) : data (s.data) { if (data) data->addRef (); }
SharedPtr (const WeakPtr <T> &);
~SharedPtr () { if (data) data->release (); }
SharedPtr<T> & operator = (const SharedPtr<T> &);
SharedPtr<T> & operator = (const WeakPtr<T> &);
SharedPtr<T> & operator = (T *);
T * ptr () const { return data ? data->ptr : 0L; }
T * operator -> () { return data ? data->ptr : 0L; }
T * operator -> () const { return data ? data->ptr : 0L; }
T & operator * () { return *data->ptr; }
const T & operator * () const { return *data->ptr; }
// operator bool () const { return data && data->ptr; }
bool operator == (const SharedPtr<T> & s) const { return data == s.data; }
bool operator == (const WeakPtr<T> & w) const;
bool operator == (const T * t) const { return (!t && !data) || (data && data->ptr == t); }
bool operator == (T * t) const { return (!t && !data) || (data && data->ptr == t); }
bool operator != (const SharedPtr<T> & s) const { return data != s.data; }
bool operator != (const WeakPtr<T> & w) const;
bool operator != (const T * t) const { return !operator == (t); }
operator T * () { return data ? data->ptr : 0L; }
operator const T * () const { return data ? data->ptr : 0L; }
mutable SharedData<T> * data;
};
template <class T>
bool operator == (T * t, SharedPtr <T> & s) {
return (!t && !s.data) || (s.data && s.data->ptr == t);
}
template <class T>
bool operator == (const T * t, SharedPtr <T> & s) {
return (!t && !s.data) || (s.data && s.data->ptr == t);
}
template <class T>
inline SharedPtr<T> & SharedPtr<T>::operator = (const SharedPtr<T> & s) {
if (data != s.data) {
SharedData<T> * tmp = data;
data = s.data;
if (data) data->addRef ();
if (tmp) tmp->release ();
}
return *this;
}
template <class T> inline SharedPtr<T> & SharedPtr<T>::operator = (T * t) {
if ((!data && t) || (data && data->ptr != t)) {
if (data) data->release ();
data = t ? new SharedData<T> (t, false) : 0L;
}
return *this;
}
/**
* Weak version of SharedPtr. This will also have access to the SharedData
* pointer, only these object wont prevent destruction of the shared
* pointer, hence weak references
*/
template <class T>
struct WeakPtr {
WeakPtr () : data (0L) {};
WeakPtr (T * t) : data (t ? new SharedData<T> (t, true) : 0) {}
WeakPtr (T * t, bool /*b*/) : data (t ? new SharedData<T> (t, true) : 0) {}
WeakPtr (const WeakPtr<T> & s) : data (s.data) { if (data) data->addWeakRef (); }
WeakPtr (const SharedPtr<T> & s) : data (s.data) { if (data) data->addWeakRef (); }
~WeakPtr () { if (data) data->releaseWeak (); }
WeakPtr<T> & operator = (const WeakPtr<T> &);
WeakPtr<T> & operator = (const SharedPtr<T> &);
WeakPtr<T> & operator = (T *);
T * ptr () const { return data ? data->ptr : 0L; }
T * operator -> () { return data ? data->ptr : 0L; }
const T * operator -> () const { return data ? data->ptr : 0L; }
T & operator * () { return *data->ptr; }
const T & operator * () const { return *data->ptr; }
// operator bool () const { return data && !!data->ptr; }
bool operator == (const WeakPtr<T> & w) const { return data == w.data; }
bool operator == (const SharedPtr<T> & s) const { return data == s.data; }
bool operator == (const T * t) const { return (!t && !data) || (data && data.ptr == t); }
bool operator == (T * t) const { return (!t && !data) || (data && data.ptr == t); }
bool operator != (const WeakPtr<T> & w) const { return data != w.data; }
bool operator != (const SharedPtr<T> & s) const { return data != s.data; }
operator T * () { return data ? data->ptr : 0L; }
operator const T * () const { return data ? data->ptr : 0L; }
mutable SharedData<T> * data;
};
template <class T>
bool operator == (T * t, WeakPtr <T> & s) {
return (!t && !s.data) || (s.data && s.data->ptr == t);
}
template <class T>
bool operator == (const T * t, WeakPtr <T> & s) {
return (!t && !s.data) || (s.data && s.data->ptr == t);
}
template <class T>
inline WeakPtr<T> & WeakPtr<T>::operator = (const WeakPtr<T> & w) {
if (data != w.data) {
SharedData<T> * tmp = data;
data = w.data;
if (data) data->addWeakRef ();
if (tmp) tmp->releaseWeak ();
}
return *this;
}
template <class T>
inline WeakPtr<T> & WeakPtr<T>::operator = (const SharedPtr<T> & s) {
if (data != s.data) {
SharedData<T> * tmp = data;
data = s.data;
if (data) data->addWeakRef ();
if (tmp) tmp->releaseWeak ();
}
return *this;
}
template <class T>
inline WeakPtr<T> & WeakPtr<T>::operator = (T * t) {
if (data) data->releaseWeak ();
data = t ? new SharedData<T> (t, true) : 0L;
return *this;
}
template <class T> inline SharedPtr<T>::SharedPtr (const WeakPtr <T> & w) : data (w.data) {
if (data) data->addRef ();
}
template <class T>
inline SharedPtr<T> & SharedPtr<T>::operator = (const WeakPtr<T> & s) {
if (data != s.data) {
SharedData<T> * tmp = data;
data = s.data;
if (data) data->addRef ();
if (tmp) tmp->release ();
}
return *this;
}
template <class T>
inline bool SharedPtr<T>::operator == (const WeakPtr<T> & w) const {
return data == w.data;
}
template <class T>
inline bool SharedPtr<T>::operator != (const WeakPtr<T> & w) const {
return data != w.data;
}
}
#endif
|
