From: "Davis Herring" <herring@lanl.gov>
To: emacs-devel@gnu.org
Subject: Re: optimizing defconst
Date: Mon, 29 Oct 2007 09:25:01 -0700 (PDT) [thread overview]
Message-ID: <39505.128.165.123.18.1193675101.squirrel@webmail.lanl.gov> (raw)
In-Reply-To: <yoijr6jet34c.fsf@remote1.student.chalmers.se>
> (if (featurep 'xemacs)
> (defvaralias 'viper-xemacs-p t)
> (defvaralias 'viper-xemacs-p nil))
>
> (setq viper-xemacs-p t)
> => Attempt to set a constant symbol: viper-xemacs-p
...which of course simplifies to
(defvaralias 'viper-xemacs-p (featurep 'xemacs))
which is of course identical to `set' in interface, though it only
supports booleans (use "(not (not val))" to convert). That's ...
intensely and simultaneously amusing and disgusting.
Davis
--
This product is sold by volume, not by mass. If it appears too dense or
too sparse, it is because mass-energy conversion has occurred during
shipping.
next prev parent reply other threads:[~2007-10-29 16:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-27 17:47 optimizing defconst Dan Nicolaescu
2007-10-27 20:32 ` Stefan Monnier
2007-10-28 2:28 ` Dan Nicolaescu
2007-10-29 0:11 ` Richard Stallman
2007-10-29 10:46 ` Kim F. Storm
2007-10-29 11:08 ` Juanma Barranquero
2007-10-29 14:19 ` Johan Bockgård
2007-10-29 16:25 ` Davis Herring [this message]
2007-10-30 2:14 ` Richard Stallman
2007-10-27 20:44 ` John Paul Wallington
2007-10-27 21:17 ` Kim F. Storm
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