Comments (2)
My initial thought is that most uses of this would probably be better done with a modify macro. Is there a compelling example for ssetf
?
from anaphora.
This article has some good examples (I think) of a somewhat similar macro called zapf (modified to use it
):
(defmacro zapf (place expr)
(multiple-value-bind
(temps exprs stores store-expr access-expr)
(get-setf-expansion place)
`(let* (,@(mapcar #'list temps exprs)
(,(car stores)
(let ((it ,access-expr))
,expr)))
,store-expr)))
(defun move-ball (ball distance screen-width)
(zapf (ball-x ball)
(mod (+ distance it) screen-width)))
from anaphora.
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from anaphora.