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Problems with Dave's LinkedList [message #24376]

Mon, 02 April 2001 11:25

s007amf
Messages: 8
Registered: January 2001

Junior Member

I am using Dave Fanning's LinkedList object and seem to have run into a
problem with it. In the procedure Delete_Node, I was getting a Invalid
Pointer error on line:

IF NOT Ptr_Valid((*currentNode).previous) THEN BEGIN

To me, it looks like the error occurs when the linked list only has one
node left. Dave has code that should deal with this condition on line:

IF index EQ (self.count - 1) THEN self->Delete_Last_Node

This code does deal with the above condition, but does not cause
Delete_Node to exit. Therefore, the list is empty and tries to execute
the first line I mentioned; which, causes a runtime error.

I changed the second line I mentioned into the following block of code
(which seems to fix the error):

IF index EQ (self.count - 1) THEN BEGIN
self->Delete_Last_Node
RETURN
END

--
Alan

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[Message index]

		Problems with Dave's LinkedList By: s007amf on Mon, 02 April 2001 11:25
		Re: Problems with Dave's LinkedList By: Martin Schultz on Tue, 03 April 2001 03:24
		Re: Problems with Dave's LinkedList By: davidf on Mon, 02 April 2001 14:21
		Re: Problems with Dave's LinkedList By: Pavel A. Romashkin on Mon, 02 April 2001 14:02
		Re: Problems with Dave's LinkedList By: davidf on Mon, 02 April 2001 11:55

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