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AUD_Reference.h

/*
 * $Id$
 *
 * ***** BEGIN LGPL LICENSE BLOCK *****
 *
 * Copyright 2009 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 Lesser General Public License as published by
 * the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
 *
 * ***** END LGPL LICENSE BLOCK *****
 */

#ifndef AUD_REFERENCE
#define AUD_REFERENCE

template <class T>
/**
 * This class provides reference counting functionality.
 */
00033 class AUD_Reference
{
private:
      /// The reference.
00037       T* m_reference;
      /// The reference counter.
00039       int* m_refcount;
public:
      /**
       * Creates a new reference counter.
       * \param reference The reference.
       */
00045       AUD_Reference(T* reference = 0)
      {
            m_reference = reference;
            m_refcount = new int; AUD_NEW("int")
            *m_refcount = 1;
      }

      /**
       * Copies a AUD_Reference object.
       * \param ref The AUD_Reference object to copy.
       */
00056       AUD_Reference(const AUD_Reference& ref)
      {
            m_reference = ref.m_reference;
            m_refcount = ref.m_refcount;
            (*m_refcount)++;
      }

      /**
       * Destroys a AUD_Reference object, if there's no furthere reference on the
       * reference, it is destroyed as well.
       */
00067       ~AUD_Reference()
      {
            (*m_refcount)--;
            if(*m_refcount == 0)
            {
                  if(m_reference != 0)
                  {
                        delete m_reference; AUD_DELETE("buffer")
                  }
                  delete m_refcount; AUD_DELETE("int")
            }
      }

      /**
       * Copies a AUD_Reference object.
       * \param ref The AUD_Reference object to copy.
       */
00084       AUD_Reference& operator=(const AUD_Reference& ref)
      {
            if(&ref == this)
                  return *this;

            (*m_refcount)--;
            if(*m_refcount == 0)
            {
                  if(m_reference != 0)
                  {
                        delete m_reference; AUD_DELETE("buffer")
                  }
                  delete m_refcount; AUD_DELETE("int")
            }

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

            return *this;
      }

      /**
       * Returns the reference.
       */
00109       T* get()
      {
            return m_reference;
      }
};

#endif // AUD_REFERENCE

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