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Diffstat (limited to 'src/qml/qml/v8/qscriptshareddata_p.h')
| -rw-r--r-- | src/qml/qml/v8/qscriptshareddata_p.h | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/qml/qml/v8/qscriptshareddata_p.h b/src/qml/qml/v8/qscriptshareddata_p.h new file mode 100644 index 0000000000..d3491c70ee --- /dev/null +++ b/src/qml/qml/v8/qscriptshareddata_p.h @@ -0,0 +1,169 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** This file may be used under the terms of the GNU Lesser General Public +** License version 2.1 as published by the Free Software Foundation and +** appearing in the file LICENSE.LGPL included in the packaging of this +** file. Please review the following information to ensure the GNU Lesser +** General Public License version 2.1 requirements will be met: +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU General +** Public License version 3.0 as published by the Free Software Foundation +** and appearing in the file LICENSE.GPL included in the packaging of this +** file. Please review the following information to ensure the GNU General +** Public License version 3.0 requirements will be met: +** http://www.gnu.org/copyleft/gpl.html. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +// +// W A R N I N G +// ------------- +// +// This file is not part of the Qt API. It exists purely as an +// implementation detail. This header file may change from version to +// version without notice, or even be removed. +// +// We mean it. +// + +#ifndef QSCRIPTSHAREDDATA_P_H +#define QSCRIPTSHAREDDATA_P_H + +#include "qglobal.h" +#include "qshareddata.h" + +QT_BEGIN_NAMESPACE + +/*! + \internal + This class should have the same interface as the QSharedData, but implementation doesn't + need to be thread safe, so atomic ref count was replaced by normal integer value. +*/ +class QScriptSharedData +{ +public: + class ReferenceCounter { + // FIXME shouldn't it be uint or something longer? + mutable int m_ref; + ReferenceCounter(int ref) : m_ref(ref) {} + ~ReferenceCounter() { Q_ASSERT_X(!m_ref, Q_FUNC_INFO, "Memory problem found"); } + public: + bool ref() { return ++m_ref; } + bool deref() { return --m_ref; } + friend class QScriptSharedData; + }; + + ReferenceCounter ref; + inline QScriptSharedData() : ref(0) { } + +private: + Q_DISABLE_COPY(QScriptSharedData) +}; + + +template <class T> class QScriptPassPointer; + +// FIXME: that could be reimplemented to not check for a null value. +template<class T> +class QScriptSharedDataPointer : public QExplicitlySharedDataPointer<T> +{ +public: + inline QScriptSharedDataPointer() {} + explicit QScriptSharedDataPointer(QScriptPassPointer<T> data) : QExplicitlySharedDataPointer<T>(data.give()) {} + explicit QScriptSharedDataPointer(T *data) : QExplicitlySharedDataPointer<T>(data) {} + + inline QScriptSharedDataPointer<T> &operator=(const QScriptPassPointer<T> &other) + { + this->QExplicitlySharedDataPointer<T>::operator =(other.give()); + return *this; + } + inline QScriptSharedDataPointer<T> &operator=(T *other) + { + this->QExplicitlySharedDataPointer<T>::operator =(other); + return *this; + } +}; + +// FIXME: that could be reimplemented to not check for a null value. +template <class T> +class QScriptPassPointer { +public: + QScriptPassPointer(T *data) : m_ptr(data) {} + inline QScriptPassPointer() { m_ptr = 0; } + inline QScriptPassPointer(const QScriptPassPointer<T> &other) : m_ptr(other.give()) {} + inline ~QScriptPassPointer() { Q_ASSERT_X(!m_ptr, Q_FUNC_INFO, "Ownership of the QScriptPassPointer hasn't been taken"); } + + inline T &operator*() const { return *m_ptr; } + inline T *operator->() { return m_ptr; } + inline T *operator->() const { return m_ptr; } + inline T *data() const { return m_ptr; } + inline const T *constData() const { return m_ptr; } + + inline bool operator==(const QScriptPassPointer<T> &other) const { return m_ptr == other.m_ptr; } + inline bool operator!=(const QScriptPassPointer<T> &other) const { return m_ptr != other.m_ptr; } + inline bool operator==(const QScriptSharedDataPointer<T> &other) const { return m_ptr == other.m_ptr; } + inline bool operator!=(const QScriptSharedDataPointer<T> &other) const { return m_ptr != other.m_ptr; } + inline bool operator==(const T *ptr) const { return m_ptr == ptr; } + inline bool operator!=(const T *ptr) const { return m_ptr != ptr; } + + inline operator bool () const { return m_ptr != 0; } + inline bool operator!() const { return !m_ptr; } + + inline QScriptPassPointer<T> & operator=(const QScriptPassPointer<T> &other) + { + if (other.m_ptr != m_ptr) { + if (m_ptr) + delete m_ptr; + m_ptr = other.give(); + } + return *this; + } + + inline QScriptPassPointer &operator=(T *other) + { + if (other != m_ptr) { + if (m_ptr) + delete m_ptr; + m_ptr = other; + } + return *this; + } + + inline T* give() const + { + T* result = m_ptr; + m_ptr = 0; + return result; + } + +private: + mutable T* m_ptr; +}; + +QT_END_NAMESPACE + +#endif // QSCRIPTSHAREDDATA_P_H |