Re: what's wrong with this use of the index to clean a list?

[Paul Johnson]

"Marcus G. Daniels" wrote:
> 
> >>>>> "PJ" == Paul Johnson <address@hidden> writes:
> 
> PJ> I found a little problem that a list called "offerList" was not
> PJ> getting cleaned out when I wanted it to. I don't understand why id
> PJ> does not, but I keep getting the exit at the end.
> 
> Do you have nils in the offerList?
> 
> Do you get the same behavior with:
> 
>  for (member = [index next]; [index getLoc] == Member; member = [index next])

OK, that makes the problem go away. 

What bothers me now is that I don't have any idea how the nil got in
there.  I don't even really understand what it would mean to have a nil
in a Swarm List object.  

I have seen the part of the collections documents where it uses that
kind of for loop that you reminded me of.  I can understand how a nil
would get in a Map object, if you did [theMap at: keyvalue insert:
nil].  But I don't see how a List object could have a nil when I'm just
using addLast: to put things in there.  And I never do [offerList
addLast:nil]. It must be the case, then, that I've got some other glitch
in the model, so I add some nonexistand object to the list and it
automatically slammed in a nil for me? 


-- 
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700

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