Re: [cells-devel] A question about the use of vectors in CELLS

Kenneth Tilton wrote:

Frank Goenninger wrote:

...

It just occurred to me that a simple :unchanged-if function should do the trick, no ?

That is always my first reaction, too. Two problems: Cells works off (setf slot-value) if you will, and no code goes through that on (setf aref). The second problem is almost the same. Even this sequence:

(setf (aref (myvector self) 42) 'hi-mom)
(setf (myvector self) (myvector self)) ;; to get to unchanged-if

...would not work because Cells saves the slot-value for comparison and in this case before and after are the same vector -- so the old element 42 of course now holds 'hi-mom.

er, because it is not "old", it is the same as in EQ vector.

kt