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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef CSV_DYN_HXX
#define CSV_DYN_HXX
namespace csv
{
/** Dyn owns an object on the heap, which will be automatically
deleted in its D'tor.
Dyn's main purpose is for class members on the heap:
You can't forget to delete them in the D'tor. Constness will be transfered
to the hold object.
Dyn forbids the CopyC'tor and operator=(). So you can't incidentally
run into problems with compiler defined CopyC'tor or operator=() of the
owning class. If you need those, you have to define them explicitely - as
you should do anyway with all classes, that own members on the heap.
Dyn also works with incomplete types.
You only need to write
class DX;
but needn't include #include <DX>.hxx.
This is a difference to std::auto_ptr, where it is not absolutely clear
if it is allowed to use it with incomplete types.
You can also use Dyn within function bodies, to make them exception safe.
@attention
If you use Dyn with an incomplete type, the owning class needs to
define a non-inline D'tor. Else the compiler will complain.
*/
template <class DX>
class Dyn
{
public:
// LIFECYCLE
/// From now on, let_dpObject is owned by this Dyn-object.
explicit Dyn(
DX * let_dpObject = 0);
~Dyn();
// OPERATORS
/** This deletes a prevoiusly existing dpObject!
From now on, let_dpObject is owned by this Dyn-object.
*/
Dyn<DX> & operator=(
DX * let_dpObject);
/// @return true, if any valid object is hold, false else.
operator bool() const;
const DX * operator->() const;
DX * operator->();
const DX & operator*() const;
DX & operator*();
// OPERATIONS
/** @return The hold object on the heap.
@ATTENTION
The caller of the function is responsible to delete
the returned object
@postcond
this->dpObject == 0.
*/
DX * Release();
// INQUIRY
/// Shorthand for operator->(), if implicit overloading of -> can not be used.
const DX * Ptr() const;
// ACCESS
/// Shorthand for operator->(), if implicit overloading of -> can not be used.
DX * Ptr();
/// So const objects can return mutable pointers to the owned object.
DX * MutablePtr() const;
private:
/* Does NOT set dpObject to zero! Because it is only used
internally in situations where dpObject is set immediately
after.
*/
void Delete();
/** Forbidden function!
-------------------
Help ensure, that classes with
dynamic pointers use a selfdefined copy constructor
and operator=(). If the default versions of these
functions are used, the compiler will throw an error.
**/
Dyn( const Dyn<DX> & );
/** Forbidden function!
-------------------
Help ensure, that classes with
dynamic pointers use a selfdefined copy constructor
and operator=(). If the default versions of these
functions are used, the compiler will throw an error.
**/
Dyn<DX> & operator=( const Dyn<DX> & );
// DATA
/// An owned heap object. Needs to be deleted by this class.
DX * dpObject;
};
// IMPLEMENTATION
template <class DX>
void
Dyn<DX>::Delete()
{
if (dpObject != 0)
delete dpObject;
}
template <class DX>
inline
Dyn<DX>::Dyn( DX * let_dpObject )
: dpObject(let_dpObject) {}
template <class DX>
inline
Dyn<DX>::~Dyn()
{ Delete(); }
template <class DX>
inline Dyn<DX> &
Dyn<DX>::operator=( DX * let_dpObject )
{
if ( dpObject == let_dpObject )
return *this;
Delete();
dpObject = let_dpObject;
return *this;
}
template <class DX>
inline
Dyn<DX>::operator bool() const
{ return dpObject != 0; }
template <class DX>
inline
const DX *
Dyn<DX>::operator->() const
{ return dpObject; }
template <class DX>
inline DX *
Dyn<DX>::operator->()
{ return dpObject; }
template <class DX>
inline const DX &
Dyn<DX>::operator*() const
{ csv_assert(dpObject != 0);
return *dpObject;
}
template <class DX>
inline DX &
Dyn<DX>::operator*()
{ csv_assert(dpObject != 0);
return *dpObject;
}
template <class DX>
inline DX *
Dyn<DX>::Release()
{ DX * ret = dpObject;
dpObject = 0;
return ret;
}
template <class DX>
inline const DX *
Dyn<DX>::Ptr() const
{ return dpObject; }
template <class DX>
inline DX *
Dyn<DX>::Ptr()
{ return dpObject; }
template <class DX>
inline DX *
Dyn<DX>::MutablePtr() const
{ return dpObject; }
} // namespace csv
#ifndef CSV_HIDE_DYN
#define Dyn ::csv::Dyn
#endif
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
