Line data Source code
1 : /****************************************************************************
2 : **
3 : ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
4 : ** Contact: http://www.qt-project.org/legal
5 : **
6 : ** This file is part of the QtCore module of the Qt Toolkit.
7 : **
8 : ** $QT_BEGIN_LICENSE:LGPL$
9 : ** Commercial License Usage
10 : ** Licensees holding valid commercial Qt licenses may use this file in
11 : ** accordance with the commercial license agreement provided with the
12 : ** Software or, alternatively, in accordance with the terms contained in
13 : ** a written agreement between you and Digia. For licensing terms and
14 : ** conditions see http://qt.digia.com/licensing. For further information
15 : ** use the contact form at http://qt.digia.com/contact-us.
16 : **
17 : ** GNU Lesser General Public License Usage
18 : ** Alternatively, this file may be used under the terms of the GNU Lesser
19 : ** General Public License version 2.1 as published by the Free Software
20 : ** Foundation and appearing in the file LICENSE.LGPL included in the
21 : ** packaging of this file. Please review the following information to
22 : ** ensure the GNU Lesser General Public License version 2.1 requirements
23 : ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 : **
25 : ** In addition, as a special exception, Digia gives you certain additional
26 : ** rights. These rights are described in the Digia Qt LGPL Exception
27 : ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 : **
29 : ** GNU General Public License Usage
30 : ** Alternatively, this file may be used under the terms of the GNU
31 : ** General Public License version 3.0 as published by the Free Software
32 : ** Foundation and appearing in the file LICENSE.GPL included in the
33 : ** packaging of this file. Please review the following information to
34 : ** ensure the GNU General Public License version 3.0 requirements will be
35 : ** met: http://www.gnu.org/copyleft/gpl.html.
36 : **
37 : **
38 : ** $QT_END_LICENSE$
39 : **
40 : ****************************************************************************/
41 :
42 : #ifndef QPOINTER_H
43 : #define QPOINTER_H
44 :
45 : #include <QtCore/qsharedpointer.h>
46 :
47 : #ifndef QT_NO_QOBJECT
48 :
49 : QT_BEGIN_NAMESPACE
50 :
51 : class QVariant;
52 :
53 : template <class T>
54 : class QPointer
55 : {
56 : template<typename U>
57 : struct TypeSelector
58 : {
59 : typedef QObject Type;
60 : };
61 : template<typename U>
62 : struct TypeSelector<const U>
63 : {
64 : typedef const QObject Type;
65 : };
66 : typedef typename TypeSelector<T>::Type QObjectType;
67 : QWeakPointer<QObjectType> wp;
68 : public:
69 0 : inline QPointer() { }
70 0 : inline QPointer(T *p) : wp(p, true) { }
71 : // compiler-generated copy/move ctor/assignment operators are fine!
72 0 : inline ~QPointer() { }
73 :
74 0 : inline QPointer<T> &operator=(T* p)
75 0 : { wp.assign(static_cast<QObjectType*>(p)); return *this; }
76 :
77 0 : inline T* data() const
78 0 : { return static_cast<T*>( wp.data()); }
79 0 : inline T* operator->() const
80 0 : { return data(); }
81 : inline T& operator*() const
82 : { return *data(); }
83 0 : inline operator T*() const
84 0 : { return data(); }
85 :
86 : inline bool isNull() const
87 : { return wp.isNull(); }
88 :
89 : inline void clear()
90 : { wp.clear(); }
91 : };
92 : template <class T> Q_DECLARE_TYPEINFO_BODY(QPointer<T>, Q_MOVABLE_TYPE);
93 :
94 : template <class T>
95 : inline bool operator==(const T *o, const QPointer<T> &p)
96 : { return o == p.operator->(); }
97 :
98 : template<class T>
99 : inline bool operator==(const QPointer<T> &p, const T *o)
100 : { return p.operator->() == o; }
101 :
102 : template <class T>
103 : inline bool operator==(T *o, const QPointer<T> &p)
104 : { return o == p.operator->(); }
105 :
106 : template<class T>
107 : inline bool operator==(const QPointer<T> &p, T *o)
108 : { return p.operator->() == o; }
109 :
110 : template<class T>
111 : inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)
112 : { return p1.operator->() == p2.operator->(); }
113 :
114 : template <class T>
115 : inline bool operator!=(const T *o, const QPointer<T> &p)
116 : { return o != p.operator->(); }
117 :
118 : template<class T>
119 : inline bool operator!= (const QPointer<T> &p, const T *o)
120 : { return p.operator->() != o; }
121 :
122 : template <class T>
123 : inline bool operator!=(T *o, const QPointer<T> &p)
124 : { return o != p.operator->(); }
125 :
126 : template<class T>
127 : inline bool operator!= (const QPointer<T> &p, T *o)
128 : { return p.operator->() != o; }
129 :
130 : template<class T>
131 : inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)
132 : { return p1.operator->() != p2.operator->() ; }
133 :
134 : template<typename T>
135 : QPointer<T>
136 : qPointerFromVariant(const QVariant &variant)
137 : {
138 : return QPointer<T>(qobject_cast<T*>(QtSharedPointer::weakPointerFromVariant_internal(variant).data()));
139 : }
140 :
141 : QT_END_NAMESPACE
142 :
143 : #endif // QT_NO_QOBJECT
144 :
145 : #endif // QPOINTER_H
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