From: Ivan Kanis <ivan.kanis@googlemail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs help <help-gnu-emacs@gnu.org>
Subject: Re: defining a setter function with gv.el
Date: Mon, 27 Aug 2012 20:10:53 +0200 [thread overview]
Message-ID: <87vcg4cij6.fsf@googlemail.com> (raw)
In-Reply-To: <jwvlih0ld2j.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Mon, 27 Aug 2012 08:54:42 -0400")
Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> So I think what you mean is that you want
>
> (my-function) => tree
> (setf (my-function) 'shrub)
> (my-function) => shrub
Yup exactly.
> As for you specific question, I suspect that it is answered in the last
> few lines of gv.el:
>
> ;;; Vaguely related definitions that should be moved elsewhere.
>
> ;; (defun alist-get (key alist)
> ;; "Get the value associated to KEY in ALIST."
> ;; (declare
> ;; (gv-expander
> ;; (lambda (do)
> ;; (macroexp-let2 macroexp-copyable-p k key
> ;; (gv-letplace (getter setter) alist
> ;; (macroexp-let2 nil p `(assoc ,k ,getter)
> ;; (funcall do `(cdr ,p)
> ;; (lambda (v)
> ;; `(if ,p (setcdr ,p ,v)
> ;; ,(funcall setter
> ;; `(cons (cons ,k ,v) ,getter)))))))))))
> ;; (cdr (assoc key alist)))
>
Good grief, does it have to be so complicated for such a simple need?
--
Ivan Kanis
http://ivan.kanis.fr
O Love, O fire! Once he drew
With one long kiss my whole soul through
My lips, as sunlight drinketh dew.
-- Alfred, Lord Tennyson
next prev parent reply other threads:[~2012-08-27 18:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-27 5:56 defining a setter function with gv.el Ivan Kanis
2012-08-27 12:54 ` Stefan Monnier
2012-08-27 18:10 ` Ivan Kanis [this message]
2012-08-27 20:28 ` Stefan Monnier
2012-08-30 16:05 ` Ivan Kanis
2012-08-31 0:59 ` Stefan Monnier
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