From: Jeremy Maitin-Shepard <jbms@attbi.com>
Subject: Re: how to turn this Gnus function into a macro?
Date: Wed, 07 Jan 2004 23:06:37 -0500 [thread overview]
Message-ID: <87fzerqe2a.fsf@jbms.ath.cx> (raw)
In-Reply-To: <b9ybrpf2jac.fsf@jpl.org> (Katsumi Yamaoka's message of "Thu, 08 Jan 2004 12:47:39 +0900")
Katsumi Yamaoka <yamaoka@jpl.org> writes:
> [snip: macro-eval-time symbol interning example]
> Unfortunately, it dosn't work for all `field's.
> (macroexpand '(spam-fetch-field-fast ART FIELD))
> => (let ((article ART))
> (if (numberp article)
> (let* ((header (assoc article (gnus-data-list nil)))
> (data-header (if header (gnus-data-header header))))
> (mail-header-FIELD data-header))))
> BTW, (eval '(MACRO ARG)) can be used, however it is four times
> slower than (MACRO ARG).
Indeed, if the field cannot always be specified as a compile-time
constant symbol, this type of approach is simply not very useful.
Special casing via `cond', as in your example, is more appropriate.
--
Jeremy Maitin-Shepard
next prev parent reply other threads:[~2004-01-08 4:06 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-07 22:19 Ted Zlatanov
2004-01-07 22:55 ` Jesper Harder
2004-01-08 0:09 ` Ted Zlatanov
2004-01-08 4:13 ` Jesper Harder
2004-01-08 2:13 ` Katsumi Yamaoka
2004-01-08 3:28 ` Ted Zlatanov
2004-01-08 3:33 ` Katsumi Yamaoka
2004-01-08 3:42 ` Jeremy Maitin-Shepard
2004-01-08 3:47 ` Katsumi Yamaoka
2004-01-08 4:06 ` Jeremy Maitin-Shepard [this message]
2004-01-08 6:06 ` Katsumi Yamaoka
2004-01-08 20:30 ` Ted Zlatanov
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