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1 /****************************************************************************
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2 **
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3 ** Copyright (C) 1992-2008 Nokia. All rights reserved.
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4 ** Copyright (C) 2006 Roberto Raggi <roberto@kdevelop.org>
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5 **
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6 ** This file is part of Qt Jambi.
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7 **
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8 ** * Commercial Usage
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9 * Licensees holding valid Qt Commercial licenses may use this file in
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10 * accordance with the Qt Commercial License Agreement provided with the
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11 * Software or, alternatively, in accordance with the terms contained in
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12 * a written agreement between you and Nokia.
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13 *
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14 *
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15 * GNU General Public License Usage
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16 * Alternatively, this file may be used under the terms of the GNU
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17 * General Public License versions 2.0 or 3.0 as published by the Free
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18 * Software Foundation and appearing in the file LICENSE.GPL included in
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19 * the packaging of this file. Please review the following information
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20 * to ensure GNU General Public Licensing requirements will be met:
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21 * http://www.fsf.org/licensing/licenses/info/GPLv2.html and
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22 * http://www.gnu.org/copyleft/gpl.html. In addition, as a special
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23 * exception, Nokia gives you certain additional rights. These rights
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24 * are described in the Nokia Qt GPL Exception version 1.2, included in
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25 * the file GPL_EXCEPTION.txt in this package.
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26 *
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27 * Qt for Windows(R) Licensees
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28 * As a special exception, Nokia, as the sole copyright holder for Qt
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29 * Designer, grants users of the Qt/Eclipse Integration plug-in the
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30 * right for the Qt/Eclipse Integration to link to functionality
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31 * provided by Qt Designer and its related libraries.
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32 *
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33 *
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34 * If you are unsure which license is appropriate for your use, please
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35 * contact the sales department at qt-sales@nokia.com.
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36
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37 **
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38 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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39 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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40 **
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41 ****************************************************************************/
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42
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43 #ifndef CODEMODEL_POINTER_H
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44 #define CODEMODEL_POINTER_H
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45
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46 #include <QtCore/QSharedData>
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47
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48 // Since the atomic API changed in 4.4 we need to hack a little here
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49 // to make it work with both 4.3 and 4.4 until that is not required
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50
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51 #if QT_VERSION >= 0x040400
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52
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53 # include <QtCore/qatomic.h>
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54 template <class T> class CodeModelPointer: public QAtomicPointer<T>
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55
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56 #else
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57
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58 template <class T> class CodeModelPointer
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59
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60 #endif // QT_VERSION >= 0x040400
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61
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62 {
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63 public:
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64 typedef T Type;
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65
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66 #if QT_VERSION < 0x040400
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67 inline T &operator*() { return *d; }
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68 inline const T &operator*() const { return *d; }
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69 inline T *operator->() { return d; }
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70 inline const T *operator->() const { return d; }
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71 inline operator T *() { return d; }
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72 inline operator const T *() const { return d; }
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73 inline T *data() { return d; }
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74 inline const T *data() const { return d; }
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75 inline const T *constData() const { return d; }
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76
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77 inline bool operator==(const CodeModelPointer<T> &other) const { return d == other.d; }
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78 inline bool operator!=(const CodeModelPointer<T> &other) const { return d != other.d; }
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79 inline bool operator==(const T *ptr) const { return d == ptr; }
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80 inline bool operator!=(const T *ptr) const { return d != ptr; }
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81
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82 inline CodeModelPointer() { d = 0; }
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83 inline ~CodeModelPointer() { if (d && !d->ref.deref()) delete d; }
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84
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85 explicit CodeModelPointer(T *data);
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86 inline CodeModelPointer(const CodeModelPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
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87 inline CodeModelPointer<T> & operator=(const CodeModelPointer<T> &o) {
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88 if (o.d != d) {
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89 T *x = o.d;
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90 if (x) x->ref.ref();
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91 x = qAtomicSetPtr(&d, x);
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92 if (x && !x->ref.deref())
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93 delete x;
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94 }
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95 return *this;
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96 }
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97 inline CodeModelPointer &operator=(T *o) {
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98 if (o != d) {
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99 T *x = o;
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100 if (x) x->ref.ref();
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101 x = qAtomicSetPtr(&d, x);
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102 if (x && !x->ref.deref())
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103 delete x;
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104 }
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105 return *this;
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106 }
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107
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108 inline bool operator!() const { return !d; }
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109
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110 private:
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111 T *d;
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112 #else // QT_VERSION < 0x040400
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113 inline CodeModelPointer(T *value = 0) : QAtomicPointer<T>(value) {}
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114
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115 inline CodeModelPointer &operator=(T *o) {
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116 QAtomicPointer<T>::operator=(o);
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117 return *this;
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118 }
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119
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120 inline T *data() { return (T *) *this; }
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121 inline const T *data() const { return (const T *) *this; }
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122 inline const T *constData() const { return (const T *) *this; }
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123 #endif
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124 };
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125
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126 #if QT_VERSION < 0x040400
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127 template <class T>
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128 Q_INLINE_TEMPLATE CodeModelPointer<T>::CodeModelPointer(T *adata) : d(adata)
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129 { if (d) d->ref.ref(); }
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130 #endif
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131
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132 #endif // CODEMODEL_POINTER_H
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