From: Helmut Eller <eller.helmut@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Understanding macros and the compilation flow
Date: Thu, 03 Jun 2010 19:22:02 +0200 [thread overview]
Message-ID: <m2wrugyqth.fsf@gmail.com> (raw)
In-Reply-To: 4694158d-131e-435d-83ff-d67d0adb699a@c11g2000vbe.googlegroups.com
* LanX [2010-06-03 17:03+0200] writes:
> Hi
>
> I've put the following code into *scratch* and did M-x eval-buffer and
> got a for me suprising result:
>
> -------------------
> (defmacro mac () '(insert " ; => before "))
>
> (defun func () (mac))
>
> (func) ; => before
>
> (defmacro mac () '(insert " ; => after"))
>
> (func) ; => after
> -----------------
>
> Seems like I didn't understand the compilation process, for my
> understanding the redefinition of the macro "mac" after defining the
> function "func" should not effect the expansion anymore...
>
> Please, what am I missing here?
func is evaluated not compiled. The evaluator expands macros every time
when func is called.
Helmut
next prev parent reply other threads:[~2010-06-03 17:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 15:03 Understanding macros and the compilation flow LanX
2010-06-03 17:22 ` Helmut Eller [this message]
[not found] ` <87fx14rpyi.fsf@kuiper.lan.informatimago.com>
2010-06-03 17:45 ` LanX
[not found] ` <jwvljaulvog.fsf-monnier+gnu.emacs.help@gnu.org>
2010-06-04 15:34 ` LanX
2010-06-04 16:48 ` Andreas Politz
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