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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: intruref.hxx,v $
* $Revision: 1.5 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef FORMULA_INTRUREF_HXX
#define FORMULA_INTRUREF_HXX
namespace formula
{
/** 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 SimpleIntrusiveReference
{
T* p;
public:
inline SimpleIntrusiveReference() : p(0) {}
inline SimpleIntrusiveReference( const SimpleIntrusiveReference& r )
{
p = r.p;
if ( p )
p->IncRef();
}
inline SimpleIntrusiveReference( T *t )
{
p = t;
if ( p )
t->IncRef();
}
inline void Clear()
{
if ( p )
{
p->DecRef();
p = 0;
}
}
inline ~SimpleIntrusiveReference()
{
if ( p )
p->DecRef();
}
inline SimpleIntrusiveReference& operator=( T* t )
{
if ( t )
t->IncRef();
if ( p )
p->DecRef();
p = t;
return *this;
}
inline SimpleIntrusiveReference& operator=( const SimpleIntrusiveReference& 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; }
inline T* get() const { return p; }
};
// =============================================================================
} // formula
// =============================================================================
#endif // SC_INTRUREF_HXX
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