From: Pascal Bourguignon <spam@mouse-potato.com>
Subject: Re: No setf-method known for funcall
Date: Thu, 18 Aug 2005 16:24:34 +0200 [thread overview]
Message-ID: <871x4r9vbx.fsf@thalassa.informatimago.com> (raw)
In-Reply-To: 1124368267.221312.44210@g44g2000cwa.googlegroups.com
kcin@mytrashmail.com writes:
> I'd like to setf a "place" which is retrieved indirectly with a funcall
> call:
>
>
> (defstruct my
> a b)
>
> (setq myinstance (make-my))
>
> (setf (my-a myinstance) 33) ; this works
>
> (setq my-get-func 'my-a)
> (setf (funcall my-get-func myinstance) 33)
> ; this doesn't work
> ; "No setf-method known for funcall"
Write a defsetf-er for funcall!
(require 'cl)
(defmacro with-gensyms (syms &rest body)
`(let ,(mapcar (lambda (s) `(,s ',(gensym (symbol-name s)))) syms) ,@body))
(define-setf-method funcall (fun &rest args)
"setf-method for (funcall fun args...)"
(let* ((vfun (eval fun))
(vexp (get-setf-method `(,vfun ,@args))))
(message "\n%S\n" vexp)
(when (null vexp)
(error "There is no defsetf for %s in %S"
vfun (cons fun args)))
vexp))
(progn
(setf x (cons :a :b))
(setf f (function cdr))
(setf (funcall f x) 1)
(insert (format "--> %S\n" x))
(dolist (f (list (function car) (function cdr)))
(setf (funcall f x) 2))
(insert (format "--> %S\n" x)))
--> (:a . 1)
--> (2 . 2)
--
"By filing this bug report you have challenged the honor of my
family. Prepare to die!"
next prev parent reply other threads:[~2005-08-18 14:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-18 12:31 No setf-method known for funcall kcin
2005-08-18 14:24 ` Pascal Bourguignon [this message]
2005-08-19 1:59 ` Barry Margolin
2005-08-19 3:47 ` Pascal Bourguignon
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