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/****************************************************************************
** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
** This file is part of the Qt Script Generator project on Qt Labs.
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
** 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.
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
****************************************************************************/
#ifndef CODEMODEL_POINTER_H
#define CODEMODEL_POINTER_H
#include <QtCore/QSharedData>
// Since the atomic API changed in 4.4 we need to hack a little here
// to make it work with both 4.3 and 4.4 until that is not required
#if QT_VERSION >= 0x040400
#   include <QtCore/qatomic.h>
template <class T> class CodeModelPointer: public QAtomicPointer<T>
template <class T> class CodeModelPointer
#endif // QT_VERSION >= 0x040400
    typedef T Type;
#if QT_VERSION < 0x040400
    inline T &operator*() { return *d; }
    inline const T &operator*() const { return *d; }
    inline T *operator->() { return d; }
    inline const T *operator->() const { return d; }
    inline operator T *() { return d; }
    inline operator const T *() const { return d; }
    inline T *data() { return d; }
    inline const T *data() const { return d; }
    inline const T *constData() const { return d; }
    inline bool operator==(const CodeModelPointer<T> &other) const { return d == other.d; }
    inline bool operator!=(const CodeModelPointer<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 CodeModelPointer() { d = 0; }
    inline ~CodeModelPointer() { if (d && !d->ref.deref()) delete d; }
    explicit CodeModelPointer(T *data);
    inline CodeModelPointer(const CodeModelPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
    inline CodeModelPointer<T> & operator=(const CodeModelPointer<T> &o) {
        if (o.d != d) {
            T *x = o.d;
            if (x) x->ref.ref();
            x = qAtomicSetPtr(&d, x);
            if (x && !x->ref.deref())
                delete x;
        return *this;
    inline CodeModelPointer &operator=(T *o) {
        if (o != d) {
            T *x = o;
            if (x) x->ref.ref();
            x = qAtomicSetPtr(&d, x);
            if (x && !x->ref.deref())
                delete x;
        return *this;
    inline bool operator!() const { return !d; }
#else // QT_VERSION < 0x040400
    inline CodeModelPointer(T *value = 0) : QAtomicPointer<T>(value) {}
    inline CodeModelPointer &operator=(T *o) {
        QAtomicPointer<T>::operator=(o);
        return *this;
    inline T *data() { return (T *) *this; }
    inline const T *data() const { return (const T *) *this; }
    inline const T *constData() const { return (const T *) *this; }
#if QT_VERSION < 0x040400
template <class T>
Q_INLINE_TEMPLATE CodeModelPointer<T>::CodeModelPointer(T *adata) : d(adata)
{ if (d) d->ref.ref(); }
#endif // CODEMODEL_POINTER_H
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