/****************************************************************************

**

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtCore module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** 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.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of internal files.  This header file may change from version to version

// without notice, or even be removed.

//

// We mean it.

//

#ifndef QSCOPEDPOINTER_P_H

#define QSCOPEDPOINTER_P_H

#include "QtCore/qscopedpointer.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

/* Internal helper class - exposes the data through data_ptr (legacy from QShared).

   Required for some internal Qt classes, do not use otherwise. */

template <typename T, typename Cleanup = QScopedPointerDeleter<T> >

class QCustomScopedPointer : public QScopedPointer<T, Cleanup>

{

public:

    explicit inline QCustomScopedPointer(T *p = 0)

        : QScopedPointer<T, Cleanup>(p)

    {

    }

    inline T *&data_ptr()

    {

        return this->d;

    }

    inline bool operator==(const QCustomScopedPointer<T, Cleanup> &other) const

    {

        return this->d == other.d;

    }

    inline bool operator!=(const QCustomScopedPointer<T, Cleanup> &other) const

    {

        return this->d != other.d;

    }

private:

    Q_DISABLE_COPY(QCustomScopedPointer)

};

/* Internal helper class - a handler for QShared* classes, to be used in QCustomScopedPointer */

template <typename T>

class QScopedPointerSharedDeleter

{

public:

    static inline void cleanup(T *d)

    {

        if (d && !d->ref.deref())

            delete d;

    }

};

/* Internal.

   This class is basically a scoped pointer pointing to a ref-counted object

 */

template <typename T>

class QScopedSharedPointer : public QCustomScopedPointer<T, QScopedPointerSharedDeleter<T> >

{

public:

    explicit inline QScopedSharedPointer(T *p = 0)

        : QCustomScopedPointer<T, QScopedPointerSharedDeleter<T> >(p)

    {

    }

    inline void detach()

    {

        qAtomicDetach(this->d);

    }

    inline void assign(T *other)

    {

        if (this->d == other)

            return;

        if (other)

            other->ref.ref();

        T *oldD = this->d;

        this->d = other;

        QScopedPointerSharedDeleter<T>::cleanup(oldD);

    }

    inline bool operator==(const QScopedSharedPointer<T> &other) const

    {

        return this->d == other.d;

    }

    inline bool operator!=(const QScopedSharedPointer<T> &other) const

    {

        return this->d != other.d;

    }

private:

    Q_DISABLE_COPY(QScopedSharedPointer)

};

QT_END_NAMESPACE

QT_END_HEADER

#endif