/************************************************************************
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Copyright (c) MCNC, Clearinghouse for Networked Information Discovery and
Retrieval, 1994. 

Permission to use, copy, modify, distribute, and sell this software and
its documentation, in whole or in part, for any purpose is hereby granted
without fee, provided that

1. The above copyright notice and this permission notice appear in all
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and/or attribution which appear at the beginning of any file included in
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to MCNC any improvements or extensions that they make, so that these may
be included in future releases; and (b) to inform MCNC/CNIDR of noteworthy
uses of this software. 

3. The names of MCNC and Clearinghouse for Networked Information Discovery
and Retrieval may not be used in any advertising or publicity relating to
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************************************************************************/

/*@@@
File:		vlist.hxx
Version:	1.00
Description:	Class VLIST - Doubly Linked Circular List Base Class
Author:		Nassib Nassar, nrn@cnidr.org
@@@*/

#ifndef VLIST_HXX
#define VLIST_HXX

#include "gdt.h"
#include "defs.hxx"

class VLIST {
public:
	VLIST();
  //	virtual VLIST& operator=(const VLIST& OtherVlist) = 0;
	virtual void   Clear();
  //	virtual void   EraseAfter(const SIZE_T Index);
	virtual void   EraseAfter(const INT Index);
	virtual void   Reverse();
  //	virtual SIZE_T GetTotalEntries() const;
	virtual INT    GetTotalEntries() const;
	virtual ~VLIST();
protected:
	virtual void   AddNode(VLIST* NewEntryPtr);
  //	virtual VLIST* GetNodePtr(const SIZE_T Index) const;
	virtual VLIST* GetNodePtr(const INT Index) const;
	virtual VLIST* GetNextNodePtr() const;
private:
	VLIST* Next;
	VLIST* Prev;
};

#endif