/**************************************************************************** | |
** | |
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** Contact: Nokia Corporation (qt-info@nokia.com) | |
** | |
** This file is part of the QtCore 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 | |
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** file. Please review the following information to ensure the GNU Lesser | |
** General Public License version 2.1 requirements will be met: | |
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** | |
** 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: | |
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** | |
** Other Usage | |
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** $QT_END_LICENSE$ | |
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****************************************************************************/ | |
#ifndef QSHAREDDATA_H | |
#define QSHAREDDATA_H | |
#include <QtCore/qglobal.h> | |
#include <QtCore/qatomic.h> | |
QT_BEGIN_HEADER | |
QT_BEGIN_NAMESPACE | |
QT_MODULE(Core) | |
template <class T> class QSharedDataPointer; | |
class Q_CORE_EXPORT QSharedData | |
{ | |
public: | |
mutable QAtomicInt ref; | |
inline QSharedData() : ref(0) { } | |
inline QSharedData(const QSharedData &) : ref(0) { } | |
private: | |
// using the assignment operator would lead to corruption in the ref-counting | |
QSharedData &operator=(const QSharedData &); | |
}; | |
template <class T> class QSharedDataPointer | |
{ | |
public: | |
typedef T Type; | |
typedef T *pointer; | |
inline void detach() { if (d && d->ref != 1) detach_helper(); } | |
inline T &operator*() { detach(); return *d; } | |
inline const T &operator*() const { return *d; } | |
inline T *operator->() { detach(); return d; } | |
inline const T *operator->() const { return d; } | |
inline operator T *() { detach(); return d; } | |
inline operator const T *() const { return d; } | |
inline T *data() { detach(); return d; } | |
inline const T *data() const { return d; } | |
inline const T *constData() const { return d; } | |
inline bool operator==(const QSharedDataPointer<T> &other) const { return d == other.d; } | |
inline bool operator!=(const QSharedDataPointer<T> &other) const { return d != other.d; } | |
inline QSharedDataPointer() { d = 0; } | |
inline ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; } | |
explicit QSharedDataPointer(T *data); | |
inline QSharedDataPointer(const QSharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); } | |
inline QSharedDataPointer<T> & operator=(const QSharedDataPointer<T> &o) { | |
if (o.d != d) { | |
if (o.d) | |
o.d->ref.ref(); | |
T *old = d; | |
d = o.d; | |
if (old && !old->ref.deref()) | |
delete old; | |
} | |
return *this; | |
} | |
inline QSharedDataPointer &operator=(T *o) { | |
if (o != d) { | |
if (o) | |
o->ref.ref(); | |
T *old = d; | |
d = o; | |
if (old && !old->ref.deref()) | |
delete old; | |
} | |
return *this; | |
} | |
inline bool operator!() const { return !d; } | |
inline void swap(QSharedDataPointer &other) | |
{ qSwap(d, other.d); } | |
protected: | |
T *clone(); | |
private: | |
void detach_helper(); | |
T *d; | |
}; | |
template <class T> class QExplicitlySharedDataPointer | |
{ | |
public: | |
typedef T Type; | |
typedef T *pointer; | |
inline T &operator*() const { return *d; } | |
inline T *operator->() { return d; } | |
inline T *operator->() const { return d; } | |
inline T *data() const { return d; } | |
inline const T *constData() const { return d; } | |
inline void detach() { if (d && d->ref != 1) detach_helper(); } | |
inline void reset() | |
{ | |
if(d && !d->ref.deref()) | |
delete d; | |
d = 0; | |
} | |
inline operator bool () const { return d != 0; } | |
inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; } | |
inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; } | |
inline bool operator==(const T *ptr) const { return d == ptr; } | |
inline bool operator!=(const T *ptr) const { return d != ptr; } | |
inline QExplicitlySharedDataPointer() { d = 0; } | |
inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; } | |
explicit QExplicitlySharedDataPointer(T *data); | |
inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); } | |
#ifndef QT_NO_MEMBER_TEMPLATES | |
template<class X> | |
inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o) : d(static_cast<T *>(o.data())) | |
{ | |
if(d) | |
d->ref.ref(); | |
} | |
#endif | |
inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) { | |
if (o.d != d) { | |
if (o.d) | |
o.d->ref.ref(); | |
T *old = d; | |
d = o.d; | |
if (old && !old->ref.deref()) | |
delete old; | |
} | |
return *this; | |
} | |
inline QExplicitlySharedDataPointer &operator=(T *o) { | |
if (o != d) { | |
if (o) | |
o->ref.ref(); | |
T *old = d; | |
d = o; | |
if (old && !old->ref.deref()) | |
delete old; | |
} | |
return *this; | |
} | |
inline bool operator!() const { return !d; } | |
inline void swap(QExplicitlySharedDataPointer &other) | |
{ qSwap(d, other.d); } | |
protected: | |
T *clone(); | |
private: | |
void detach_helper(); | |
T *d; | |
}; | |
template <class T> | |
Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) : d(adata) | |
{ if (d) d->ref.ref(); } | |
template <class T> | |
Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone() | |
{ | |
return new T(*d); | |
} | |
template <class T> | |
Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper() | |
{ | |
T *x = clone(); | |
x->ref.ref(); | |
if (!d->ref.deref()) | |
delete d; | |
d = x; | |
} | |
template <class T> | |
Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone() | |
{ | |
return new T(*d); | |
} | |
template <class T> | |
Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper() | |
{ | |
T *x = clone(); | |
x->ref.ref(); | |
if (!d->ref.deref()) | |
delete d; | |
d = x; | |
} | |
template <class T> | |
Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) : d(adata) | |
{ if (d) d->ref.ref(); } | |
template <class T> | |
Q_INLINE_TEMPLATE void qSwap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2) | |
{ p1.swap(p2); } | |
template <class T> | |
Q_INLINE_TEMPLATE void qSwap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2) | |
{ p1.swap(p2); } | |
QT_END_NAMESPACE | |
QT_END_HEADER | |
#endif // QSHAREDDATA_H |