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/*
* $Id$
*
* ***** 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 *****
*/
/** \file audaspace/intern/AUD_Reference.h
* \ingroup audaspaceintern
*/
#ifndef AUD_REFERENCE
#define AUD_REFERENCE
template <class T>
/**
* This class provides reference counting functionality.
*/
class AUD_Reference
{
private:
/// The reference.
T* m_reference;
/// The reference counter.
int* m_refcount;
public:
/**
* Creates a new reference counter.
* \param reference The reference.
*/
AUD_Reference(T* reference = 0)
{
m_reference = reference;
m_refcount = new int;
*m_refcount = 1;
}
/**
* Copies an AUD_Reference object.
* \param ref The AUD_Reference object to copy.
*/
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.
*/
~AUD_Reference()
{
(*m_refcount)--;
if(*m_refcount == 0)
{
if(m_reference)
{
delete m_reference;
}
delete m_refcount;
}
}
/**
* Assigns an AUD_Reference to this object.
* \param ref The AUD_Reference object to assign.
*/
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;
}
/**
* Returns the reference.
*/
T* get() const
{
return m_reference;
}
};
#endif // AUD_REFERENCE
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