PTLib Version 2.12.9

- Main Page
- Related Pages
- Namespaces
- Classes
- Files

- File List
- File Members

All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
smartptr.h
Go to the documentation of this file.
1 /*
2 * smartptr.h
3 *
4 * Smart pointer template class.
5 *
6 * Portable Tools Library
7 *
8 * Copyright (c) 1993-1998 Equivalence Pty. Ltd.
9 *
10 * The contents of this file are subject to the Mozilla Public License
11 * Version 1.0 (the "License"); you may not use this file except in
12 * compliance with the License. You may obtain a copy of the License at
13 * http://www.mozilla.org/MPL/
14 *
15 * Software distributed under the License is distributed on an "AS IS"
16 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
17 * the License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * The Original Code is Portable Windows Library.
21 *
22 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
23 *
24 * Portions are Copyright (C) 1993 Free Software Foundation, Inc.
25 * All Rights Reserved.
26 *
27 * Contributor(s): ______________________________________.
28 *
29 * $Revision: 24177 $
30 * $Author: rjongbloed $
31 * $Date: 2010-04-05 21:52:04 +1000 (Mon, 05 Apr 2010) $
32 */
33
34 #ifndef PTLIB_SMARTPTR_H
35 #define PTLIB_SMARTPTR_H
36
37 #include <ptlib.h>
38 #include <ptlib/object.h>
39
41 // "Smart" pointers.
42
52 class PSmartObject : public PObject
53 {
54 PCLASSINFO(PSmartObject, PObject);
55
56 public:
60 PSmartObject()
61 :referenceCount(1) { }
62
63 protected:
67 PAtomicInteger referenceCount;
68
69
70 friend class PSmartPointer;
71 };
72
73
88 class PSmartPointer : public PObject
89 {
90 PCLASSINFO(PSmartPointer, PObject);
91
92 public:
98 PSmartPointer(
99 PSmartObject * obj = NULL
100 ) { object = obj; }
101
106 PSmartPointer(
107 const PSmartPointer & ptr
108 );
109
114 virtual ~PSmartPointer();
115
126 PSmartPointer & operator=(
127 const PSmartPointer & ptr
128 );
130
142 virtual Comparison Compare(
143 const PObject & obj
144 ) const;
146
155 PBoolean IsNULL() const { return object == NULL; }
156
162 PSmartObject * GetObject() const { return object; }
164
165 protected:
166 // Member variables
168 PSmartObject * object;
169 };
170
171
174 template <class T> class PSmartPtr : public PSmartPointer
175 {
176 PCLASSINFO(PSmartPtr, PSmartPointer);
177 public:
179 PSmartPtr(T * ptr = NULL)
180 : PSmartPointer(ptr) { }
181
183 T * operator->() const
184 { return (T *)PAssertNULL(object); }
185
187 T & operator*() const
188 { return *(T *)PAssertNULL(object); }
189
191 operator T*() const
192 { return (T *)object; }
193 };
194
195
196 #endif // PTLIB_SMARTPTR_H
197
198
199 // End Of File ///////////////////////////////////////////////////////////////