From: Andreas Schwab <schwab@linux-m68k.org>
To: Leo <sdl.web@gmail.com>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: Re: Common Lisp like feature expressions (was: How and when to use GCPRO?)
Date: Mon, 27 Dec 2010 20:38:21 +0100 [thread overview]
Message-ID: <m2pqsn9fbm.fsf@whitebox.home> (raw)
In-Reply-To: <m1fwtjggqc.fsf_-_@cam.ac.uk> (Leo's message of "Mon, 27 Dec 2010 19:26:03 +0000")
Leo <sdl.web@gmail.com> writes:
> +(defun eval-feature-expression (form)
> + (cond
> + ((atom form) (featurep form nil))
> + ;; ensure form is a proper list
> + ((condition-case nil
> + (and (length form) nil)
Nice quadratic behaviour.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2010-12-27 19:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-27 9:21 How and when to use GCPRO? Leo
2010-12-27 10:15 ` Andreas Schwab
2010-12-27 10:38 ` Leo
2010-12-27 11:17 ` Andreas Schwab
2010-12-27 16:00 ` Stefan Monnier
2010-12-27 17:51 ` Andreas Schwab
2010-12-28 1:01 ` Stefan Monnier
2010-12-28 1:33 ` Daniel Colascione
2010-12-28 2:17 ` Stefan Monnier
2010-12-28 3:37 ` Daniel Colascione
2010-12-28 4:15 ` Stefan Monnier
2010-12-28 4:36 ` Conservative scanning (was: Re: How and when to use GCPRO?) Daniel Colascione
2010-12-28 17:07 ` How and when to use GCPRO? Richard Stallman
2010-12-27 19:15 ` Leo
2010-12-27 19:26 ` Common Lisp like feature expressions (was: How and when to use GCPRO?) Leo
2010-12-27 19:38 ` Andreas Schwab [this message]
2010-12-27 19:57 ` Leo
2010-12-28 1:01 ` Common Lisp like feature expressions Stefan Monnier
2010-12-28 15:26 ` Leo
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