From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Glenn Morris <rgm@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: No cl-lib replacement for define-modify-macro?
Date: Tue, 06 Nov 2012 13:03:10 -0500 [thread overview]
Message-ID: <jwvvcdi629w.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <t17gpy65cg.fsf@fencepost.gnu.org> (Glenn Morris's message of "Tue, 06 Nov 2012 11:53:03 -0500")
>> The replacement is gv-letplace.
> How do I write:
> (define-modify-macro incf (&optional (n 1)) +)
> using gv-letplace? (Forget about the "&optional" bit if necessary.)
Guaranteed 100% untested:
(defmacro incf (place &optional n)
(gv-letplace (getter setter) place
(macroexp-let2 nil v (or n 1)
(funcall setter `(+ ,v ,getter)))))
-- Stefan
prev parent reply other threads:[~2012-11-06 18:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-06 8:12 No cl-lib replacement for define-modify-macro? Glenn Morris
2012-11-06 14:59 ` Stefan Monnier
2012-11-06 16:53 ` Glenn Morris
2012-11-06 18:03 ` Stefan Monnier [this message]
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