1 | /****************************************************************************
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2 | ** $Id: qcleanuphandler.h 2 2005-11-16 15:49:26Z dmik $
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3 | **
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4 | ** ...
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5 | **
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6 | ** Copyright (C) 2001-2002 Trolltech AS. All rights reserved.
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7 | **
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8 | ** This file is part of the tools module of the Qt GUI Toolkit.
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9 | **
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10 | ** This file may be distributed under the terms of the Q Public License
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11 | ** as defined by Trolltech AS of Norway and appearing in the file
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12 | ** LICENSE.QPL included in the packaging of this file.
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13 | **
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14 | ** This file may be distributed and/or modified under the terms of the
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15 | ** GNU General Public License version 2 as published by the Free Software
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16 | ** Foundation and appearing in the file LICENSE.GPL included in the
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17 | ** packaging of this file.
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18 | **
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19 | ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
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20 | ** licenses may use this file in accordance with the Qt Commercial License
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21 | ** Agreement provided with the Software.
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22 | **
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23 | ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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24 | ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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25 | **
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26 | ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
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27 | ** information about Qt Commercial License Agreements.
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28 | ** See http://www.trolltech.com/qpl/ for QPL licensing information.
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29 | ** See http://www.trolltech.com/gpl/ for GPL licensing information.
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30 | **
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31 | ** Contact info@trolltech.com if any conditions of this licensing are
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32 | ** not clear to you.
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33 | **
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34 | **********************************************************************/
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35 |
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36 | #ifndef QCLEANUPHANDLER_H
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37 | #define QCLEANUPHANDLER_H
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38 |
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39 | #ifndef QT_H
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40 | #include "qptrlist.h"
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41 | #endif // QT_H
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42 |
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43 | template<class Type>
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44 | class QCleanupHandler
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45 | {
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46 | public:
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47 | QCleanupHandler() : cleanupObjects( 0 ) {}
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48 | ~QCleanupHandler() { clear(); }
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49 |
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50 | Type* add( Type **object ) {
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51 | if ( !cleanupObjects )
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52 | cleanupObjects = new QPtrList<Type*>;
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53 | cleanupObjects->insert( 0, object );
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54 | return *object;
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55 | }
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56 |
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57 | void remove( Type **object ) {
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58 | if ( !cleanupObjects )
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59 | return;
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60 | if ( cleanupObjects->findRef( object ) >= 0 )
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61 | (void) cleanupObjects->take();
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62 | }
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63 |
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64 | bool isEmpty() const {
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65 | return cleanupObjects ? cleanupObjects->isEmpty() : TRUE;
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66 | }
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67 |
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68 | void clear() {
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69 | if ( !cleanupObjects )
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70 | return;
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71 | QPtrListIterator<Type*> it( *cleanupObjects );
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72 | Type **object;
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73 | while ( ( object = it.current() ) ) {
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74 | delete *object;
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75 | *object = 0;
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76 | cleanupObjects->remove( object );
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77 | }
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78 | delete cleanupObjects;
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79 | cleanupObjects = 0;
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80 | }
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81 |
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82 | private:
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83 | QPtrList<Type*> *cleanupObjects;
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84 | };
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85 |
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86 | template<class Type>
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87 | class QSingleCleanupHandler
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88 | {
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89 | public:
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90 | QSingleCleanupHandler() : object( 0 ) {}
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91 | ~QSingleCleanupHandler() {
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92 | if ( object ) {
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93 | delete *object;
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94 | *object = 0;
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95 | }
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96 | }
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97 | Type* set( Type **o ) {
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98 | object = o;
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99 | return *object;
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100 | }
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101 | void reset() { object = 0; }
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102 | private:
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103 | Type **object;
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104 | };
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105 |
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106 | template<class Type>
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107 | class QSharedCleanupHandler
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108 | {
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109 | public:
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110 | QSharedCleanupHandler() : object( 0 ) {}
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111 | ~QSharedCleanupHandler() {
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112 | if ( object ) {
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113 | if ( (*object)->deref() )
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114 | delete *object;
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115 | *object = 0;
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116 | }
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117 | }
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118 | Type* set( Type **o ) {
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119 | object = o;
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120 | return *object;
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121 | }
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122 | void reset() { object = 0; }
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123 | private:
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124 | Type **object;
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125 | };
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126 |
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127 | #endif //QCLEANUPHANDLER_H
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