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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: intruref.hxx,v $
*
* $Revision: 1.4 $
*
* last change: $Author: rt $ $Date: 2005-09-08 17:43:30 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef SC_INTRUREF_HXX
#define SC_INTRUREF_HXX
/** A simple intrusive refcounting template, not thread safe, but therefore
also a bit faster than boost's smart_ptr or uno::Reference equivalents, and
the type to be refcounted has full control over its behavior.
Mainly used in formula compiler and interpreter context, e.g. ScTokenRef,
ScMatrixRef.
Type T must implement methods IncRef() and DecRef(), in case typename T is
const they must be const as well and the reference counter be mutable.
*/
template< typename T > class ScSimpleIntrusiveReference
{
T* p;
public:
inline ScSimpleIntrusiveReference() : p(0) {}
inline ScSimpleIntrusiveReference( const ScSimpleIntrusiveReference& r )
{
p = r.p;
if ( p )
p->IncRef();
}
inline ScSimpleIntrusiveReference( T *t )
{
p = t;
if ( p )
t->IncRef();
}
inline void Clear()
{
if ( p )
{
p->DecRef();
p = 0;
}
}
inline ~ScSimpleIntrusiveReference()
{
if ( p )
p->DecRef();
}
inline ScSimpleIntrusiveReference& operator=( T* t )
{
if ( t )
t->IncRef();
if ( p )
p->DecRef();
p = t;
return *this;
}
inline ScSimpleIntrusiveReference& operator=( const ScSimpleIntrusiveReference& r )
{
*this = r.p;
return *this;
}
inline bool Is() const { return p != 0; }
inline bool operator ! () const { return p == 0; }
inline T* operator&() const { return p; }
inline T* operator->() const { return p; }
inline T& operator*() const { return *p; }
inline operator T*() const { return p; }
};
#endif // SC_INTRUREF_HXX
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