/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * 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 
 * OpenSceneGraph Public License for more details.
*/
#ifndef OSG_STATEATTRIBUTECALLBACK
#define OSG_STATEATTRIBUTECALLBACK 1

#include <osg/Export>
#include <osg/Object>

namespace osg {

class StateAttribute;
class NodeVisitor;

class OSG_EXPORT StateAttributeCallback : public virtual osg::Object
{
    public:
        StateAttributeCallback() {}

        StateAttributeCallback(const StateAttributeCallback&,const CopyOp&) {}

        META_Object(osg,StateAttributeCallback);

        /** do customized update code.*/
        virtual void operator () (StateAttribute*, NodeVisitor*) {}
};

}

#endif
