//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_SHALLOWCOPY
#define OSG_SHALLOWCOPY 1

namespace osg {

class Referenced;
class Object;
class Image;
class Texture;
class StateSet;
class StateAttribute;
class Node;
class Drawable;

/** Cloner Functor used to control the whether shallow or deep copy is used
  * during copy construction and clone operation. The base Cloner acts as
  * a shallow copy simply passing back the same pointer as passed in.*/
struct Cloner
{
    virtual ~Cloner() {}
    
    virtual Referenced*     operator() (const Referenced* ref) const { return const_cast<Referenced*>(ref); }
    virtual Object*         operator() (const Object* obj) const { return const_cast<Object*>(obj); }
    virtual Node*           operator() (const Node* node) const { return const_cast<Node*>(node); }
    virtual Drawable*       operator() (const Drawable* drawable) const { return const_cast<Drawable*>(drawable); }
    virtual StateSet*       operator() (const StateSet* stateset) const { return const_cast<StateSet*>(stateset); }
    virtual StateAttribute* operator() (const StateAttribute* attr) const { return const_cast<StateAttribute*>(attr); }
    virtual Texture*        operator() (const Texture* text) const { return const_cast<Texture*>(text); }
    virtual Image*          operator() (const Image* image) const { return const_cast<Image*>(image); }
};

/** Convenience typedef so that users can use the more logical ShallowCopy in their own code.*/
typedef Cloner ShallowCopy;

};

#endif