From: Andy Wingo <wingo@pobox.com>
To: Josef Wolf <jw@raven.inka.de>
Cc: guile-user@gnu.org
Subject: Re: Need help to understand a macro
Date: Fri, 19 Mar 2010 15:28:39 +0100 [thread overview]
Message-ID: <m3sk7wxu5k.fsf@pobox.com> (raw)
In-Reply-To: <20100319085701.GA31143@raven.wolf.lan> (Josef Wolf's message of "Fri, 19 Mar 2010 09:57:01 +0100")
Hi,
On Fri 19 Mar 2010 09:57, Josef Wolf <jw@raven.inka.de> writes:
> (show-expansion (defstruct tree height girth age leaf-shape leaf-color))
(macroexpand '(defstruct ...))
You might want to surround that with (pretty-print ...) from (ice-9
pretty-print).
> Of course this is possible. After all, code is data and data is code.
Sorta. Syntax-rules/syntax-case macros operate on syntax objects, not on
raw s-expressions. This allows them to preserve referential
transparency. So the result of expansion might not look like what you
would expect.
Read up on syntax-rules and syntax-case macros, when you get some time.
I used to love defmacros but I don't use them any more.
http://git.savannah.gnu.org/gitweb/?p=guile.git;a=blob;f=doc/ref/api-macros.texi;h=51f54ed070af453a138282f61e7cd8dbbddc53a3;hb=HEAD
Happy hacking,
Andy
--
http://wingolog.org/
next prev parent reply other threads:[~2010-03-19 14:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-19 8:57 Need help to understand a macro Josef Wolf
2010-03-19 12:54 ` Ken Raeburn
2010-03-22 19:25 ` Josef Wolf
2010-03-22 20:16 ` Andy Wingo
2010-03-22 20:54 ` Josef Wolf
2010-03-19 14:28 ` Andy Wingo [this message]
2010-03-19 16:15 ` Andreas Rottmann
2010-03-22 19:55 ` Josef Wolf
2010-03-22 21:50 ` Andreas Rottmann
2010-03-22 19:50 ` Josef Wolf
2010-03-22 20:36 ` Andy Wingo
2010-03-22 21:01 ` Josef Wolf
2010-03-23 0:50 ` Neil Jerram
2010-03-20 14:13 ` szgyg
2010-03-22 21:06 ` Josef Wolf
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