[Openmcl-devel] compute values in place

Pascal J. Bourguignon pjb at informatimago.com
Sun Sep 30 09:38:46 UTC 2012


Taoufik Dachraoui <dachraoui.taoufik at gmail.com> writes:

> is it possible to have something like this:
>
> (let ((a '(#1=expr #1#))
>        (setmemloc (getmemloc (car a)) (eval (car a))))

So it's Sunday, brains are sleeping…

What do you think

>     (let* ((form '#1=(+ 1 2))
>            (nv (eval form))
>            (sexp '(#1# 3 #1# #(4 #1# #(5 #1# 6) #1#))))
>       (values (mapcar (lambda (g.s) (funcall (cdr g.s) nv))
>                       (find-all-places sexp form))
>               sexp))

is?

    (defun getmemloc (sexp form) 
      (find-all-places sexp form))

    (defun setmemloc (places new-value)
      (mapcar (lambda (g.s) (funcall (cdr g.s) new-value)) places))

    (let ((a '(#1=(+ 1 2) 3 #1# #(4 #1# #(5 #1# 6) #1#))))
       (setmemloc (getmemloc a (car a)) (eval (car a)))
       a)
    --> (3 3 3 #(4 3 #(5 3 6) 3))

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/
A bad day in () is better than a good day in {}.




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