1 /****************************************************************************
3 ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/legal
6 ** This file is part of the QtQml module of the Qt Toolkit.
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.
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.
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.
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.
40 ****************************************************************************/
46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
53 #ifndef QSCRIPTSHAREDDATA_P_H
54 #define QSCRIPTSHAREDDATA_P_H
57 #include "qshareddata.h"
63 This class should have the same interface as the QSharedData, but implementation doesn't
64 need to be thread safe, so atomic ref count was replaced by normal integer value.
66 class QScriptSharedData
69 class ReferenceCounter {
70 // FIXME shouldn't it be uint or something longer?
72 ReferenceCounter(int ref) : m_ref(ref) {}
73 ~ReferenceCounter() { Q_ASSERT_X(!m_ref, Q_FUNC_INFO, "Memory problem found"); }
75 bool ref() { return ++m_ref; }
76 bool deref() { return --m_ref; }
77 friend class QScriptSharedData;
81 inline QScriptSharedData() : ref(0) { }
84 Q_DISABLE_COPY(QScriptSharedData)
88 template <class T> class QScriptPassPointer;
90 // FIXME: that could be reimplemented to not check for a null value.
92 class QScriptSharedDataPointer : public QExplicitlySharedDataPointer<T>
95 inline QScriptSharedDataPointer() {}
96 explicit QScriptSharedDataPointer(QScriptPassPointer<T> data) : QExplicitlySharedDataPointer<T>(data.give()) {}
97 explicit QScriptSharedDataPointer(T *data) : QExplicitlySharedDataPointer<T>(data) {}
99 inline QScriptSharedDataPointer<T> &operator=(const QScriptPassPointer<T> &other)
101 this->QExplicitlySharedDataPointer<T>::operator =(other.give());
104 inline QScriptSharedDataPointer<T> &operator=(T *other)
106 this->QExplicitlySharedDataPointer<T>::operator =(other);
111 // FIXME: that could be reimplemented to not check for a null value.
113 class QScriptPassPointer {
115 QScriptPassPointer(T *data) : m_ptr(data) {}
116 inline QScriptPassPointer() { m_ptr = 0; }
117 inline QScriptPassPointer(const QScriptPassPointer<T> &other) : m_ptr(other.give()) {}
118 inline ~QScriptPassPointer() { Q_ASSERT_X(!m_ptr, Q_FUNC_INFO, "Ownership of the QScriptPassPointer hasn't been taken"); }
120 inline T &operator*() const { return *m_ptr; }
121 inline T *operator->() { return m_ptr; }
122 inline T *operator->() const { return m_ptr; }
123 inline T *data() const { return m_ptr; }
124 inline const T *constData() const { return m_ptr; }
126 inline bool operator==(const QScriptPassPointer<T> &other) const { return m_ptr == other.m_ptr; }
127 inline bool operator!=(const QScriptPassPointer<T> &other) const { return m_ptr != other.m_ptr; }
128 inline bool operator==(const QScriptSharedDataPointer<T> &other) const { return m_ptr == other.m_ptr; }
129 inline bool operator!=(const QScriptSharedDataPointer<T> &other) const { return m_ptr != other.m_ptr; }
130 inline bool operator==(const T *ptr) const { return m_ptr == ptr; }
131 inline bool operator!=(const T *ptr) const { return m_ptr != ptr; }
133 inline operator bool () const { return m_ptr != 0; }
134 inline bool operator!() const { return !m_ptr; }
136 inline QScriptPassPointer<T> & operator=(const QScriptPassPointer<T> &other)
138 if (other.m_ptr != m_ptr) {
141 m_ptr = other.give();
146 inline QScriptPassPointer &operator=(T *other)
148 if (other != m_ptr) {
156 inline T* give() const
169 #endif // QSCRIPTSHAREDDATA_P_H