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Hello,
Well, you have declared abstract methods in the abstract class, so you have
to implement those methods in the "real" class:
> StringNode = POINTER TO StringNodeDesc;
> StringNodeDesc = RECORD (NodeDesc)
> key : ARRAY 11 OF CHAR;
> END;
PROCEDURE (x : StringNode) EqualTo* (y : Node) : BOOLEAN;
BEGIN
WITH y: StringNode DO
RETURN x.key = y.key
ELSE
RETURN FALSE
END
END EqualTo;
Note:
you can declare the class as follows (without declaring NodeDesc):
Node* = POINTER TO ABSTRACT RECORD
next*: Node
END;
Regards,
Juan Antonio
--------------------------------------------
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Received on Mon Sep 23 2002 - 16:06:19 UTC