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Re: printing.el again
From: |
Stefan Monnier |
Subject: |
Re: printing.el again |
Date: |
Mon, 15 Nov 2004 15:47:27 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/21.3.50 (gnu/linux) |
> Ok, but a very long time ago there was a recommendation to do not use cl
> package when writing code in Emacs Lisp.
> Is that recommendation no more valid?
CL functions should indeed not be used by packages distributed with Emacs.
OTOH, CL macros (such as `push', `flet', ...) can be used just fine (just
don't forget to put a (eval-when-compile (require 'cl)) at the top of your
file).
>> BTW, if you use (featurep 'xemacs) for the test, Emacs-21 will optimize
>> the test away (since the resulting elc file can't be run on XEmacs
>> anyway). Here it doesn't really matter, but it is sometimes very handy
>> since it ends up getting rid of spurious warnings about
>> XEmacs-specific code.
> Well, so:
> A) (cond ((eq ps-print-emacs-type 'xemacs) ...)
> (t ...))
> B) (cond ((featurep 'xemacs) ...)
> (t ...))
> Are you saying that A and B above are treated differently by the
> byte-compiler??
Yes.
The byte-compiler will not optimize away the `eq' test because it considers
that the user might change ps-print-emacs-type at any time. OTOH the
byte-compiler knows that since the code it generates doesn't work under
XEmacs, (featurep 'xemacs) will always return nil.
Stefan
- printing.el again, Stefan, 2004/11/14
- Re: printing.el again, Vinicius Jose Latorre, 2004/11/14
- Re: printing.el again, Stefan Monnier, 2004/11/14
- Re: printing.el again, Vinicius Jose Latorre, 2004/11/15
- Re: printing.el again,
Stefan Monnier <=
- Re: printing.el again, Vinicius Jose Latorre, 2004/11/15
- Re: printing.el again, Stefan, 2004/11/15
- Re: printing.el again, Luc Teirlinck, 2004/11/15
- Re: printing.el again, Ralf Angeli, 2004/11/16
- Re: printing.el again, Stefan Monnier, 2004/11/16
- Re: printing.el again, Vinicius Jose Latorre, 2004/11/17
- Re: printing.el again, Stefan Monnier, 2004/11/18
- Re: printing.el again, Vinicius Jose Latorre, 2004/11/18
- Re: printing.el again, Stefan Monnier, 2004/11/18
- Re: printing.el again, Richard Stallman, 2004/11/19