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Eliminated or reduced compiler errors and warnings, as tested with
egcs-2.91.66 (on Red Hat 6.0) and gcc 2.96 (on Red Hat 6.2).

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  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.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  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
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*--------------------------------------------------------------
 *  This is an example from the Inventor Toolmaker,
 *  chapter 2, example 5.
 *
 *  Header file for "Alternate" group node.
 *------------------------------------------------------------*/

#include <Inventor/nodes/SoGroup.h>
// SoGroup.h includes SoSubNode.h; no need to include it again

class Alternate : public SoGroup {

   SO_NODE_HEADER(Alternate);

 public:
   // Initializes this class
   static void   initClass();

   // Default constructor
   Alternate();

   // Constructor that takes approximate number of children as
   // a hint
   Alternate(int numChildren);

 protected:
   // Generic traversal of children for any action
   virtual void  doAction(SoAction *action);

   // These implement supported actions
   virtual void  getBoundingBox(SoGetBoundingBoxAction *action);
   virtual void  GLRender(SoGLRenderAction *action);
   virtual void  handleEvent(SoHandleEventAction *action);
   virtual void  pick(SoPickAction *action);
   virtual void  getMatrix(SoGetMatrixAction *action);
   virtual void  search(SoSearchAction *action);

 private:
   // Destructor
   virtual ~Alternate();
};