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HxRcObject.h

/*
 *  Copyright (c) 1998, University of Amsterdam, The Netherlands.
 *  All rights reserved.
 *
 *
 *  Author(s):
 *  Dennis Koelma (koelma@wins.uva.nl)
 *  Edo Poll (poll@wins.uva.nl)
 */

#ifndef HxRcObject_h
#define HxRcObject_h

#include "HxStd.h"


class L_HXBASIS HxRcObject
{
public:
    HxRcObject*             addRef();
    void                    removeRef();
    HxRcObject*             assign(HxRcObject* rhs);
    int                     isShared() const;
    HxRcObject*             getUnshared();
    HxRcObject*             doGetUnshared();
    virtual HxRcObject*     clone() const ; // overload for value semantics
    int                     refCnt() const;
protected:
                            HxRcObject();
    virtual                 ~HxRcObject();
private:
    int                     _refCnt;
};


inline
HxRcObject::HxRcObject() : _refCnt(0)
{
}

inline
HxRcObject::~HxRcObject()
{
}

inline HxRcObject*
HxRcObject::addRef()
{ 
    _refCnt++; 
    return this; 
} 

inline void
HxRcObject::removeRef()
{ 
    if (--_refCnt <= 0) 
        delete this; 
}

inline HxRcObject*
HxRcObject::assign(HxRcObject* rhs)
{
    rhs->addRef();
    removeRef();
    return rhs;
}

inline int
HxRcObject::isShared() const
{ 
    return _refCnt > 1; 
}

inline HxRcObject*
HxRcObject::getUnshared()
{
    return (_refCnt <= 1) ? this : doGetUnshared();
}

inline int
HxRcObject::refCnt() const
{
    return _refCnt;
}

#endif

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