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-/****************************************************************************
-**
-** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the QtCore module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial Usage
-** Licensees holding valid Qt Commercial licenses may use this file in
-** accordance with the Qt Commercial License Agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Nokia.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, 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.
-**
-** If you have questions regarding the use of this file, please contact
-** Nokia at qt-info@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#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();
- if (d && !d->ref.deref())
- delete d;
- d = o.d;
- }
- return *this;
- }
- inline QSharedDataPointer &operator=(T *o) {
- if (o != d) {
- if (o)
- o->ref.ref();
- if (d && !d->ref.deref())
- delete d;
- d = o;
- }
- 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();
- if (d && !d->ref.deref())
- delete d;
- d = o.d;
- }
- return *this;
- }
- inline QExplicitlySharedDataPointer &operator=(T *o) {
- if (o != d) {
- if (o)
- o->ref.ref();
- if (d && !d->ref.deref())
- delete d;
- d = o;
- }
- 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
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