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

**

** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

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

**

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

**

** $QT_BEGIN_LICENSE:LGPL$

** GNU Lesser General Public License Usage

** 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.

**

** Other Usage

** Alternatively, this file may be used in accordance with the terms and

** conditions contained in a signed written agreement between you and Nokia.

**

**

**

**

**

** $QT_END_LICENSE$

**

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

//

//  W A R N I N G

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

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

#ifndef QPatternist_AutoPtr_p_h

#define QPatternist_AutoPtr_p_h

#include <QtGlobal>

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    template<typename T>

    class AutoPtrRef

    {

    public:

        explicit AutoPtrRef(T *const other) : m_ptr(other)

        {

        }

        T* m_ptr;

    };

    template<typename T>

    class AutoPtr

    {

    public:

        explicit inline AutoPtr(T *pointer = 0) : m_ptr(pointer)

        {

        }

        inline AutoPtr(AutoPtr<T> &other) : m_ptr(other.release())

        {

        }

        inline ~AutoPtr()

        {

            delete m_ptr;

        }

        inline T &operator*() const

        {

            Q_ASSERT_X(m_ptr, Q_FUNC_INFO, "");

            return *m_ptr;

        }

        T *operator->() const

        {

            Q_ASSERT_X(m_ptr, Q_FUNC_INFO, "");

            return m_ptr;

        }

        inline bool operator!() const

        {

            return !m_ptr;

        }

        inline operator bool() const

        {

            return m_ptr != 0;

        }

        AutoPtr(AutoPtrRef<T> ref) : m_ptr(ref.m_ptr)

        {

        }

        AutoPtr& operator=(AutoPtrRef<T> ref)

        {

            if(ref.m_ptr != m_ptr)

            {

                delete m_ptr;

                m_ptr = ref.m_ptr;

            }

            return *this;

        }

        template<typename L>

        operator AutoPtrRef<L>()

        {

            return AutoPtrRef<L>(this->release());

        }

        template<typename L>

        operator AutoPtr<L>()

        {

            return AutoPtr<L>(this->release());

        }

        template<typename L>

        inline AutoPtr(AutoPtr<L>& other) : m_ptr(other.release())

        {

        }

        inline T *release()

        {

            T *const retval = m_ptr;

            m_ptr = 0;

            return retval;

        }

        inline T *data() const

        {

            return m_ptr;

        }

        void reset(T * other = 0)

        {

            if(other != m_ptr)

            {

                delete m_ptr;

                m_ptr = other;

            }

        }

        inline AutoPtr &operator=(AutoPtr &other)

        {

            reset(other.release());

            return *this;

        }

    private:

        T *m_ptr;

    };

}

QT_END_NAMESPACE

#endif