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comp.lang.lisp |
On 27 Jun 2003, Joe Marshall wrote: > Instead of RPLACA and RPLACD, you should use SETF > and > (setf (cadr args) subst) instead of (rplacd args (list subst)) > You should consider representing the nodes in your tree as defstructs. Thanks anyway. Greg
I was under the impression thet using SETF on elements of a list
would not alter the origional structure...
> (setf (car args) subst) instead of (rplaca args subst) This did not work when I tried the substitution, however
(setf (second args) subst) worked fine...
This unfortunataly did not solve the problem - looks like i will have to
re-implement the program using structures.