Diffstat (limited to 'libopie2/opiecore/osharedpointer.h') (more/less context) (ignore whitespace changes)
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diff --git a/libopie2/opiecore/osharedpointer.h b/libopie2/opiecore/osharedpointer.h new file mode 100644 index 0000000..f19d836 --- a/dev/null +++ b/libopie2/opiecore/osharedpointer.h | |||
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1 | // -*- Mode: C++; -*- | ||
2 | /* | ||
3 | This file is part of the Opie Project | ||
4 | Copyright (C) 2004 Rajko Albrecht <alwin@handhelds.org> | ||
5 | Copyright (C) 2004 Holger Hans Peter Freyther <freyther@handhelds.org> | ||
6 | Copyright (C) The Opie Team <opie-devel@handhelds.org> | ||
7 | =. | ||
8 | .=l. | ||
9 | .>+-= | ||
10 | _;:, .> :=|. This program is free software; you can | ||
11 | .> <`_, > . <= redistribute it and/or modify it under | ||
12 | :`=1 )Y*s>-.-- : the terms of the GNU Library General Public | ||
13 | .="- .-=="i, .._ License as published by the Free Software | ||
14 | - . .-<_> .<> Foundation; either version 2 of the License, | ||
15 | ._= =} : or (at your option) any later version. | ||
16 | .%`+i> _;_. | ||
17 | .i_,=:_. -<s. This program is distributed in the hope that | ||
18 | + . -:. = it will be useful, but WITHOUT ANY WARRANTY; | ||
19 | : .. .:, . . . without even the implied warranty of | ||
20 | =_ + =;=|` MERCHANTABILITY or FITNESS FOR A | ||
21 | _.=:. : :=>`: PARTICULAR PURPOSE. See the GNU | ||
22 | ..}^=.= = ; Library General Public License for more | ||
23 | ++= -. .` .: details. | ||
24 | : = ...= . :.=- | ||
25 | -. .:....=;==+<; You should have received a copy of the GNU | ||
26 | -_. . . )=. = Library General Public License along with | ||
27 | -- :-=` this library; see the file COPYING.LIB. | ||
28 | If not, write to the Free Software Foundation, | ||
29 | Inc., 59 Temple Place - Suite 330, | ||
30 | Boston, MA 02111-1307, USA. | ||
31 | */ | ||
32 | |||
33 | |||
34 | #ifndef O_SHARED_POINTER_H | ||
35 | #define O_SHARED_POINTER_H | ||
36 | |||
37 | #include <opie2/osmartpointer.h> | ||
38 | |||
39 | /*! | ||
40 | * \file osharedpointer.h | ||
41 | * \brief Adapter with Refcounting around any data type | ||
42 | * \author Rajko Albrecht and Holger Hans Peter Freyther | ||
43 | */ | ||
44 | |||
45 | namespace Opie { | ||
46 | namespace Core { | ||
47 | template<class T> | ||
48 | class OSharedPointerData : public ORefCount { | ||
49 | public: | ||
50 | OSharedPointerData( T* dt ) { | ||
51 | data = dt; | ||
52 | } | ||
53 | |||
54 | ~OSharedPointerData() { | ||
55 | delete data; | ||
56 | } | ||
57 | |||
58 | T *data; | ||
59 | }; | ||
60 | |||
61 | |||
62 | /** | ||
63 | * \brief A small Adapter around any Pointer | ||
64 | * | ||
65 | * | ||
66 | * | ||
67 | */ | ||
68 | template<class T> | ||
69 | class OSharedPointer { | ||
70 | typedef OSharedPointerData<T> Data; | ||
71 | Data* data; | ||
72 | |||
73 | void unref() { | ||
74 | if (data) { data->Decr(); if (!data->Shared()) delete data; } | ||
75 | data = 0; | ||
76 | } | ||
77 | |||
78 | public: | ||
79 | OSharedPointer () { data = 0;} | ||
80 | |||
81 | OSharedPointer( T* t ) { | ||
82 | data = new Data( t ); | ||
83 | data->Incr(); | ||
84 | } | ||
85 | |||
86 | OSharedPointer( const OSharedPointer<T>& p ) { | ||
87 | if ( data = p.data ) data->Incr(); | ||
88 | } | ||
89 | |||
90 | ~OSharedPointer() { | ||
91 | unref(); | ||
92 | } | ||
93 | |||
94 | OSharedPointer<T> &operator=( const OSharedPointer<T>& p ) { | ||
95 | // already same: nothing to do | ||
96 | if (data == p.data) return *this; | ||
97 | // decouple reference | ||
98 | unref(); | ||
99 | // establish new reference | ||
100 | if (data = p.data) data->Incr(); | ||
101 | return *this; | ||
102 | } | ||
103 | |||
104 | OSharedPointer<T> &operator=( T *p ) { | ||
105 | unref(); | ||
106 | data = new Data( p ); | ||
107 | data->Incr(); | ||
108 | |||
109 | return *this; | ||
110 | } | ||
111 | |||
112 | operator T* () const { return data->data; } | ||
113 | T& operator*() { return *data->data; } | ||
114 | const T& operator*()const { return data->data; } | ||
115 | |||
116 | //! deref with method call | ||
117 | T* operator-> () {return data->data; } | ||
118 | //! deref with const method call | ||
119 | const T* operator-> ()const {return data->data; } | ||
120 | |||
121 | |||
122 | //! supports "if (pointer)" | ||
123 | operator bool () const { return (data != 0 && data->data != 0); } | ||
124 | //! "if (pointer)" as non const | ||
125 | operator bool () { return ( data != 0 && data->data != NULL );} | ||
126 | |||
127 | //! support if (!pointer)" | ||
128 | bool operator! () const { return (data == 0 || data->data == 0); } | ||
129 | //! support if (!pointer)" as non const | ||
130 | bool operator! () { return (data == 0 || data->data == 0); } | ||
131 | }; | ||
132 | |||
133 | } | ||
134 | } | ||
135 | |||
136 | #endif | ||