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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 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 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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