IvfMathPointer.h

//
// Copyright 1999-2006 by Structural Mechanics, Lund University.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "ivf@byggmek.lth.se".
//
//
// Written by Jonas Lindemann
//

#ifndef _CIvfPointer_h_
#define _CIvfPointer_h_

#include <ivf/ivfconfig.h>
#include <ivf/IvfDef.h>

template <class T> class CIvfPointer {
private:
        T* m_object;
public:
        CIvfPointer(T* object = 0)
        {
                m_object = object;
                if (m_object)
                {
                        IvfDbg1("CIvfPointer: created for " << m_object->getClassName());
                        m_object->addReference();
                }
                else
                {
                        IvfDbg1("CIvfPointer: assigned 0");
                }
        }

        CIvfPointer(const CIvfPointer& ivfObject)
        {
                m_object = ivfObject.m_object;
                if (m_object)
                {
                        IvfDbg1("CIvfPointer: assigned " << m_object->getClassName());
                        m_object->addReference();
                }
                else
                {
                        IvfDbg1("CIvfPointer: assigned 0");
                }
        }

        virtual ~CIvfPointer()
        {
                if (m_object)
                {
                        m_object->deleteReference();
                        IvfDbg1("CIvfPointer: " << m_object->getClassName() << " dereferenced.");
                        if (!m_object->referenced())
                        {
                                delete m_object;
                                IvfDbg1("CIvfPointer: " << m_object->getClassName() << " deleted.");
                        }
                }
        }

        operator T* () const { return m_object; }
        T& operator* () const { return *m_object; }
        T* operator-> () const { return m_object; }

        CIvfPointer& operator= (const CIvfPointer& ivfPointer)
        {
                if (m_object!=ivfPointer.m_object)
                {
                        if (m_object)
                        {
                                m_object->deleteReference();
                                IvfDbg1("CIvfPointer(=): " << m_object->getClassName() << " dereferenced.");
                                if (!m_object->referenced())
                                {
                                        delete m_object;
                                        IvfDbg1("CIvfPointer(=): " << m_object->getClassName() << " deleted.");
                                }
                        }

                        m_object = ivfPointer.m_object;

                        if (m_object)
                        {
                                IvfDbg1("CIvfPointer(=): assigned " << m_object->getClassName());
                                m_object->addReference();
                        }
                        else
                        {
                                IvfDbg1("CIvfPointer(=): assigned 0");
                        }
                }
                return *this;
        }

        CIvfPointer& operator= (T* ivfObject)
        {
                if (m_object!=ivfObject)
                {
                        if (m_object)
                        {
                                m_object->deleteReference();
                                IvfDbg1("CIvfPointer(=): " << m_object->getClassName() << " dereferenced.");
                                if (!m_object->referenced())
                                {
                                        delete m_object;
                                        IvfDbg1("CIvfPointer(=): " << m_object->getClassName() << " deleted.");
                                }
                        }

                        m_object = ivfObject;

                        if (m_object)
                        {
                                IvfDbg1("CIvfPointer(=): assigned " << m_object->getClassName());
                                m_object->addReference();
                        }
                        else
                        {
                                IvfDbg1("CIvfPointer(=): assigned 0");
                        }
                }
                return *this;
        }

        bool operator== (T* ivfObject) const { return m_object == ivfObject; }
        bool operator!= (T* ivfObject) const { return m_object != ivfObject; }
        bool operator== (const CIvfPointer& ivfPointer) const 
        {
                return m_object == ivfPointer.m_object;
        }

        bool operator!= (const CIvfPointer& ivfPointer) const
        {
                return m_object != ivfPointer.m_object;
        }
};

#endif 

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