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261 lines
7.4 KiB
261 lines
7.4 KiB
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QSHAREDDATA_H
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#define QSHAREDDATA_H
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#include <QtCore/qglobal.h>
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#include <QtCore/qatomic.h>
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QT_BEGIN_HEADER
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QT_BEGIN_NAMESPACE
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QT_MODULE(Core)
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template <class T> class QSharedDataPointer;
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class Q_CORE_EXPORT QSharedData
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{
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public:
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mutable QAtomicInt ref;
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inline QSharedData() : ref(0) { }
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inline QSharedData(const QSharedData &) : ref(0) { }
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private:
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// using the assignment operator would lead to corruption in the ref-counting
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QSharedData &operator=(const QSharedData &);
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};
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template <class T> class QSharedDataPointer
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{
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public:
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typedef T Type;
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typedef T *pointer;
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inline void detach() { if (d && d->ref != 1) detach_helper(); }
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inline T &operator*() { detach(); return *d; }
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inline const T &operator*() const { return *d; }
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inline T *operator->() { detach(); return d; }
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inline const T *operator->() const { return d; }
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inline operator T *() { detach(); return d; }
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inline operator const T *() const { return d; }
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inline T *data() { detach(); return d; }
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inline const T *data() const { return d; }
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inline const T *constData() const { return d; }
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inline bool operator==(const QSharedDataPointer<T> &other) const { return d == other.d; }
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inline bool operator!=(const QSharedDataPointer<T> &other) const { return d != other.d; }
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inline QSharedDataPointer() { d = 0; }
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inline ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; }
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explicit QSharedDataPointer(T *data);
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inline QSharedDataPointer(const QSharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
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inline QSharedDataPointer<T> & operator=(const QSharedDataPointer<T> &o) {
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if (o.d != d) {
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if (o.d)
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o.d->ref.ref();
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if (d && !d->ref.deref())
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delete d;
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d = o.d;
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}
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return *this;
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}
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inline QSharedDataPointer &operator=(T *o) {
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if (o != d) {
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if (o)
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o->ref.ref();
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if (d && !d->ref.deref())
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delete d;
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d = o;
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}
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return *this;
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}
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inline bool operator!() const { return !d; }
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inline void swap(QSharedDataPointer &other)
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{ qSwap(d, other.d); }
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protected:
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T *clone();
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private:
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void detach_helper();
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T *d;
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};
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template <class T> class QExplicitlySharedDataPointer
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{
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public:
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typedef T Type;
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typedef T *pointer;
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inline T &operator*() const { return *d; }
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inline T *operator->() { return d; }
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inline T *operator->() const { return d; }
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inline T *data() const { return d; }
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inline const T *constData() const { return d; }
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inline void detach() { if (d && d->ref != 1) detach_helper(); }
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inline void reset()
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{
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if(d && !d->ref.deref())
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delete d;
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d = 0;
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}
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inline operator bool () const { return d != 0; }
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inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; }
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inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; }
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inline bool operator==(const T *ptr) const { return d == ptr; }
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inline bool operator!=(const T *ptr) const { return d != ptr; }
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inline QExplicitlySharedDataPointer() { d = 0; }
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inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; }
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explicit QExplicitlySharedDataPointer(T *data);
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inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
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#ifndef QT_NO_MEMBER_TEMPLATES
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template<class X>
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inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o) : d(static_cast<T *>(o.data()))
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{
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if(d)
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d->ref.ref();
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}
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#endif
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inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) {
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if (o.d != d) {
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if (o.d)
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o.d->ref.ref();
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if (d && !d->ref.deref())
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delete d;
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d = o.d;
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}
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return *this;
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}
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inline QExplicitlySharedDataPointer &operator=(T *o) {
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if (o != d) {
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if (o)
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o->ref.ref();
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if (d && !d->ref.deref())
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delete d;
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d = o;
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}
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return *this;
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}
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inline bool operator!() const { return !d; }
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inline void swap(QExplicitlySharedDataPointer &other)
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{ qSwap(d, other.d); }
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protected:
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T *clone();
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private:
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void detach_helper();
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T *d;
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};
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template <class T>
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Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) : d(adata)
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{ if (d) d->ref.ref(); }
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template <class T>
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Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone()
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{
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return new T(*d);
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}
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template <class T>
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Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper()
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{
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T *x = clone();
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x->ref.ref();
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if (!d->ref.deref())
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delete d;
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d = x;
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}
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template <class T>
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Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone()
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{
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return new T(*d);
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}
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template <class T>
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Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper()
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{
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T *x = clone();
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x->ref.ref();
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if (!d->ref.deref())
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delete d;
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d = x;
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}
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template <class T>
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Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) : d(adata)
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{ if (d) d->ref.ref(); }
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template <class T>
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Q_INLINE_TEMPLATE void qSwap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2)
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{ p1.swap(p2); }
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template <class T>
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Q_INLINE_TEMPLATE void qSwap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2)
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{ p1.swap(p2); }
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QT_END_NAMESPACE
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QT_END_HEADER
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#endif // QSHAREDDATA_H
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