From: Richard Stallman <rms@gnu.org>
To: Alan Mackenzie <acm@muc.de>
Cc: emacs-devel@gnu.org
Subject: Re: How about text-property-functions using `equal' rather than `eq'?
Date: Tue, 05 Feb 2008 03:04:22 -0500 [thread overview]
Message-ID: <E1JMIn0-0007ZQ-NH@fencepost.gnu.org> (raw)
In-Reply-To: <20080204205358.GA2747@muc.de> (message from Alan Mackenzie on Mon, 4 Feb 2008 20:53:58 +0000)
All the built in text property functions which compare properties appear
to use `eq' for the comparison. Some of these actually say this in
their doc-strings or the pertinent manual page, some of them might
actually say it in both. ;-(
`eq' is faster, and a priori I see no reason to think that `equal'
is better in general.
I would dearly love to use text-property-any to locate such a buffer
position, but unfortunately (eq '(1) '(1)) => nil. :-( So I've had to
code up a clumsy equivalent which will certainly be much slower.
You can write code which uses the primitives to find the next non-eq
property, then comparing it with equal and looping so that you find
the next non-equal property.
next prev parent reply other threads:[~2008-02-05 8:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-04 20:53 How about text-property-functions using `equal' rather than `eq'? Alan Mackenzie
2008-02-05 8:04 ` Richard Stallman [this message]
2008-02-05 8:48 ` David Kastrup
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