/****************************************************************************+
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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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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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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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** 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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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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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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+
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#include <QtCore/qglobal.h>+
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#include <QtCore/qatomic.h>+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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QT_MODULE(Core)+
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+
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template <class T> class QSharedDataPointer;+
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+
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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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+
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    inline QSharedData() : ref(0) { }+
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    inline QSharedData(const QSharedData &) : ref(0) { }+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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    inline bool operator!() const { return !d; }+
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+
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    inline void swap(QSharedDataPointer &other)+
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    { qSwap(d, other.d); }+
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+
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protected:+
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    T *clone();+
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+
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private:+
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    void detach_helper();+
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+
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    T *d;+
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};+
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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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+
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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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+
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    inline void detach() { if (d && d->ref != 1) detach_helper(); }+
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+
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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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+
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        d = 0;+
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    }+
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+
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    inline operator bool () const { return d != 0; }+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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    inline bool operator!() const { return !d; }+
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+
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    inline void swap(QExplicitlySharedDataPointer &other)+
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    { qSwap(d, other.d); }+
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+
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protected:+
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    T *clone();+
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+
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private:+
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    void detach_helper();+
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+
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    T *d;+
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};+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif // QSHAREDDATA_H+
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