From: Barry Margolin <barmar@alum.mit.edu>
To: help-gnu-emacs@gnu.org
Subject: Re: how to temporarily remove a function from a hook?
Date: Thu, 09 Jul 2009 00:04:02 -0400 [thread overview]
Message-ID: <barmar-50AD19.00040209072009@news.eternal-september.org> (raw)
In-Reply-To: 87ab3elgpl.fsf@galatea.local
In article <87ab3elgpl.fsf@galatea.local>,
pjb@informatimago.com (Pascal J. Bourguignon) wrote:
> Kevin Rodgers <kevin.d.rodgers@gmail.com> writes:
>
> > What is the right way to temporarily remove a function from a hook?
> >
> >
> > My best guess is:
> >
> > (let ((foo-hook (progn (remove-hook 'bar 'foo-hook) foo-hook)))
> > ...)
>
>
> This won't work, because remove-hook actually modifies the outside
> variable foo-hook.
>
>
> Write simply:
>
> (let ((foo-hook (remove 'bar foo-hook)))
> ...)
Or:
(let ((foo-hook foo-hook))
(remove-hook 'bar 'foo-hook)
...)
This doesn't violate the abstraction of remove-hook.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
next prev parent reply other threads:[~2009-07-09 4:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.2124.1247103655.2239.help-gnu-emacs@gnu.org>
2009-07-09 2:42 ` how to temporarily remove a function from a hook? Pascal J. Bourguignon
2009-07-09 4:04 ` Barry Margolin [this message]
2009-07-09 11:14 ` Johan Bockgård
2009-07-09 1:40 Kevin Rodgers
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