From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Luca Ferrari <fluca1978@infinito.it>
Cc: help-gnu-emacs@gnu.org
Subject: Re: creating a function that works for active region or whole buffer
Date: Fri, 01 Feb 2013 08:55:25 -0500 [thread overview]
Message-ID: <jwva9rorvgg.fsf-monnier+INBOX@gnu.org> (raw)
In-Reply-To: <CAKoxK+7ZnWRra9asH8CtcSCzKEm6Mw_AdFiZ_DWOBnaTiS7Ogw@mail.gmail.com> (Luca Ferrari's message of "Fri, 1 Feb 2013 11:36:49 +0100")
>> goto-line and line-number-at-pos are expensive operations that count
>> (and re-count and re-re-count every time) the number of LF chars from
>> the beginning of the buffer.
> I'm using them only at the beginning of the function, and therefore
> once per function call, that does not sound very expensive to me.
> What do you suggest instead?
Use buffer positions. I.e. (point) and (goto-char POS).
After (goto-char POS) you may call (beginning-of-line) or (end-of-line)
if you want to make sure you're at a line boundary.
Stefan
prev parent reply other threads:[~2013-02-01 13:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-22 11:20 creating a function that works for active region or whole buffer Luca Ferrari
2013-01-22 14:37 ` Mark Skilbeck
2013-01-22 16:01 ` Le Wang
2013-01-22 17:18 ` Ludwig, Mark
[not found] ` <mailman.18089.1358876370.855.help-gnu-emacs@gnu.org>
2013-01-22 19:57 ` Barry Margolin
2013-01-23 7:41 ` Luca Ferrari
2013-01-23 7:43 ` Luca Ferrari
2013-01-28 14:02 ` Stefan Monnier
2013-02-01 10:36 ` Luca Ferrari
2013-02-01 13:55 ` Stefan Monnier [this message]
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