GmsListLink.h

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//  File:  GmsListLink.h
//  Author:  Alan Breakstone
 
/* This class is derived from a similar class in "A C++ Toolkit",
   which is Copyright 1991 by Jonathan S. Shapiro, and is used
   with permission.  "A C++ Toolkit" is published by Prentice Hall, Inc. */
 
//  Contents ---------------------------------------------------------
//
//  GmsListLink
//
//  Description:
//   
//  C++ header file for Gismo GmsListLink class
//
//  End --------------------------------------------------------------
 
 
//  Interface Dependencies -------------------------------------------
 
#ifndef GMSLISTLINK_H
#define GMSLISTLINK_H
 
//  End Interface Dependencies ---------------------------------------
 
 
//  Class  //
 
class GmsListLink
{  // base class for any object that needs to be part of a doubly-linked list
    friend class GmsList;
protected:                  // make available to derived classes
    GmsListLink *_next; // pointer to next item in list
    GmsListLink *_prev; // pointer to previous item in list
public:
    GmsListLink() { _next = _prev = 0; }
    virtual ~GmsListLink();
    GmsListLink *next()const { return _next; }
    GmsListLink *prev()const { return _prev; }
};
 
#endif