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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the QtCore module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #ifndef QPOINTER_H |
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43 #define QPOINTER_H |
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44 |
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45 #include <QtCore/qobject.h> |
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46 |
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47 QT_BEGIN_HEADER |
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48 |
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49 QT_BEGIN_NAMESPACE |
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50 |
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51 QT_MODULE(Core) |
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52 |
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53 template <class T> |
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54 class QPointer |
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55 { |
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56 QObject *o; |
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57 public: |
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58 inline QPointer() : o(0) {} |
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59 inline QPointer(T *p) : o(p) |
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60 { QMetaObject::addGuard(&o); } |
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61 inline QPointer(const QPointer<T> &p) : o(p.o) |
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62 { QMetaObject::addGuard(&o); } |
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63 inline ~QPointer() |
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64 { QMetaObject::removeGuard(&o); } |
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65 inline QPointer<T> &operator=(const QPointer<T> &p) |
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66 { if (this != &p) QMetaObject::changeGuard(&o, p.o); return *this; } |
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67 inline QPointer<T> &operator=(T* p) |
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68 { if (o != p) QMetaObject::changeGuard(&o, p); return *this; } |
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69 |
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70 inline bool isNull() const |
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71 { return !o; } |
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72 |
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73 inline T* operator->() const |
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74 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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75 inline T& operator*() const |
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76 { return *static_cast<T*>(const_cast<QObject*>(o)); } |
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77 inline operator T*() const |
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78 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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79 inline T* data() const |
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80 { return static_cast<T*>(const_cast<QObject*>(o)); } |
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81 }; |
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82 |
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83 |
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84 #if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T * |
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85 |
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86 template <class T> |
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87 inline bool operator==(const T *o, const QPointer<T> &p) |
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88 { return o == p.operator->(); } |
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89 |
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90 template<class T> |
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91 inline bool operator==(const QPointer<T> &p, const T *o) |
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92 { return p.operator->() == o; } |
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93 |
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94 #else |
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95 |
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96 template<class T> |
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97 inline bool operator==(const void *o, const QPointer<T> &p) |
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98 { return o == p.operator->(); } |
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99 |
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100 template<class T> |
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101 inline bool operator==(const QPointer<T> &p, const void *o) |
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102 { return p.operator->() == o; } |
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103 |
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104 #endif |
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105 |
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106 template <class T> |
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107 inline bool operator==(T *o, const QPointer<T> &p) |
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108 { return o == p.operator->(); } |
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109 |
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110 template<class T> |
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111 inline bool operator==(const QPointer<T> &p, T *o) |
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112 { return p.operator->() == o; } |
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113 |
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114 template<class T> |
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115 inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2) |
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116 { return p1.operator->() == p2.operator->(); } |
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117 |
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118 |
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119 #if (!defined(Q_CC_SUN) || (__SUNPRO_CC >= 0x580)) // ambiguity between const T * and T * |
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120 |
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121 template <class T> |
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122 inline bool operator!=(const T *o, const QPointer<T> &p) |
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123 { return o != p.operator->(); } |
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124 |
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125 template<class T> |
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126 inline bool operator!= (const QPointer<T> &p, const T *o) |
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127 { return p.operator->() != o; } |
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128 |
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129 #else |
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130 |
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131 template<class T> |
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132 inline bool operator!= (const void *o, const QPointer<T> &p) |
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133 { return o != p.operator->(); } |
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134 |
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135 template<class T> |
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136 inline bool operator!= (const QPointer<T> &p, const void *o) |
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137 { return p.operator->() != o; } |
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138 |
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139 #endif |
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140 |
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141 template <class T> |
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142 inline bool operator!=(T *o, const QPointer<T> &p) |
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143 { return o != p.operator->(); } |
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144 |
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145 template<class T> |
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146 inline bool operator!= (const QPointer<T> &p, T *o) |
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147 { return p.operator->() != o; } |
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148 |
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149 template<class T> |
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150 inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2) |
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151 { return p1.operator->() != p2.operator->() ; } |
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152 |
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153 // Make MSVC < 1400 (2005) handle "if (NULL == p)" syntax |
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154 #if defined(Q_CC_MSVC) && (_MSC_VER < 1400) |
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155 template<class T> |
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156 inline bool operator== (int i, const QPointer<T> &p) |
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157 { Q_ASSERT(i == 0); return !i && p.isNull(); } |
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158 |
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159 template<class T> |
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160 inline bool operator!= (int i, const QPointer<T> &p) |
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161 { Q_ASSERT(i == 0); return !i && !p.isNull(); } |
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162 #endif |
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163 |
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164 QT_END_NAMESPACE |
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165 |
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166 QT_END_HEADER |
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167 |
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168 #endif // QPOINTER_H |