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DLSTELEM.H
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C/C++ Source or Header
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1990-09-26
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2KB
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103 lines
#ifndef _DLSTELEM_H
#define _DLSTELEM_H
//
// This file contains proprietary information of Borland International.
// Copying or reproduction without prior written approval is prohibited.
//
// Copyright (c) 1990
// Borland International
// 1800 Green Hills Road
// Scotts Valley, CA 95066
// (408) 438-8400
//
// Contents ----------------------------------------------------------------
//
// DoubleListElement
//
// Description
//
// Defines the class DoubleListElement. Objects of this class may
// be part of lists which can be traversed in forward and reverse
// order.
//
// End ---------------------------------------------------------------------
// Interface Dependencies ---------------------------------------------------
#ifndef _IOSTREAM_H
#include <iostream.h>
#define _IOSTREAM_H
#endif
#ifndef __CLSTYPES_H
#include <clstypes.h>
#endif
#ifndef __OBJECT_H
#include <object.h>
#endif
// End Interface Dependencies ------------------------------------------------
// Class //
class DoubleListElement
{
public:
DoubleListElement( Object *o ) { data = o; next = previous = 0; }
~DoubleListElement() { delete data; }
private:
DoubleListElement *next;
DoubleListElement *previous;
Object *data;
friend class DoubleList;
friend class DoubleListIterator;
};
// Description -------------------------------------------------------------
//
// Defines the abstract class DoubleListElement.
//
// Constructor
//
// DoubleListElement
//
// Constructor based on ListElement constructor which makes a
// list element from an object reference.
//
// Destructor
//
// ~DoubleListElement
//
// We delete the data.
//
//
// Private Members
//
// next
//
// The next double list element.
//
// previous
//
// The previous double list element.
//
// data
//
// Pointer to the double list element's data.
//
// Friends
//
// class DoubleList
//
// class DoubleListIterator
//
// End ---------------------------------------------------------------------
#endif // ifndef _DLSTELEM_H //