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/*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*/
/** \file
* \ingroup intern_memutil
*
* Declaration of MEM_RefCounted class.
*/
#ifndef __MEM_REFCOUNTED_H__
#define __MEM_REFCOUNTED_H__
/**
* An object with reference counting.
* Base class for objects with reference counting.
* When a shared object is ceated, it has reference count == 1.
* If the reference count of a shared object reaches zero, the object self-destructs.
* The default destructor of this object has been made protected on purpose.
* This disables the creation of shared objects on the stack.
*
* \author Maarten Gribnau
* \date March 31, 2001
*/
class MEM_RefCounted {
public:
/**
* Constructs a a shared object.
*/
MEM_RefCounted() : m_refCount(1)
{
}
/**
* Returns the reference count of this object.
* \return the reference count.
*/
inline virtual int getRef() const;
/**
* Increases the reference count of this object.
* \return the new reference count.
*/
inline virtual int incRef();
/**
* Decreases the reference count of this object.
* If the reference count reaches zero, the object self-destructs.
* \return the new reference count.
*/
inline virtual int decRef();
protected:
/**
* Destructs a shared object.
* The destructor is protected to force the use of incRef and decRef.
*/
virtual ~MEM_RefCounted()
{
}
protected:
/** The reference count. */
int m_refCount;
};
inline int MEM_RefCounted::getRef() const
{
return m_refCount;
}
inline int MEM_RefCounted::incRef()
{
return ++m_refCount;
}
inline int MEM_RefCounted::decRef()
{
m_refCount--;
if (m_refCount == 0) {
delete this;
return 0;
}
return m_refCount;
}
#endif // __MEM_REFCOUNTED_H__
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