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- #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 //
-
-