AUD_Reference.h

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/*
 * $Id: AUD_Reference.h 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef AUD_REFERENCE
#define AUD_REFERENCE

template <class T>
class AUD_Reference
{
private:
        T* m_reference;
        int* m_refcount;
public:
        AUD_Reference(T* reference = 0)
        {
                m_reference = reference;
                m_refcount = new int;
                *m_refcount = 1;
        }

        AUD_Reference(const AUD_Reference& ref)
        {
                m_reference = ref.m_reference;
                m_refcount = ref.m_refcount;
                (*m_refcount)++;
        }

        ~AUD_Reference()
        {
                (*m_refcount)--;
                if(*m_refcount == 0)
                {
                        if(m_reference)
                        {
                                delete m_reference;
                        }
                        delete m_refcount;
                }
        }

        AUD_Reference& operator=(const AUD_Reference& ref)
        {
                if(&ref == this)
                        return *this;

                (*m_refcount)--;
                if(*m_refcount == 0)
                {
                        if(m_reference)
                        {
                                delete m_reference;
                        }
                        delete m_refcount;
                }

                m_reference = ref.m_reference;
                m_refcount = ref.m_refcount;
                (*m_refcount)++;

                return *this;
        }

        T* get() const
        {
                return m_reference;
        }
};

#endif // AUD_REFERENCE