From: Emanuel Berg <moasen@zoho.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Why looking-at-p works?
Date: Tue, 06 Mar 2018 09:49:59 +0100 [thread overview]
Message-ID: <86r2oxsi4o.fsf@zoho.com> (raw)
In-Reply-To: mailman.10182.1520323093.27995.help-gnu-emacs@gnu.org
Marcin Borkowski wrote:
> (defsubst looking-at-p (regexp) "\ Same as
> `looking-at' except this function does not
> change the match data." (let
> ((inhibit-changing-match-data t)) (looking-at
> regexp)))
>
> What happens is that if I make looking-at in
> the above code fail (e.g., by saying
> (looking-at-p 123)),
> inhibit-changing-match-data remains nil, even
> though there is no unwind-protect here.
> Why does it work like this?
Do you need dynamic scope for `let' to work
like that?
--
underground experts united
http://user.it.uu.se/~embe8573
next parent reply other threads:[~2018-03-06 8:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.10182.1520323093.27995.help-gnu-emacs@gnu.org>
2018-03-06 8:49 ` Emanuel Berg [this message]
2018-05-15 8:34 ` Why looking-at-p works? andlind
2018-05-15 8:49 ` tomas
2018-03-06 7:57 Marcin Borkowski
2018-03-06 18:53 ` John Mastro
2018-03-06 20:42 ` Marcin Borkowski
2018-03-06 22:23 ` Drew Adams
2018-03-07 9:09 ` Marcin Borkowski
2018-03-07 13:06 ` Marcin Borkowski
2018-03-07 19:53 ` Eli Zaretskii
2018-03-08 4:20 ` Marcin Borkowski
2018-03-08 4:40 ` Eli Zaretskii
2018-03-08 20:33 ` Marcin Borkowski
2018-03-06 23:17 ` Nick Dokos
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