From: "Herbert Euler" <herberteuler@hotmail.com>
Subject: Re: Macro vs Function
Date: Thu, 13 Apr 2006 00:14:39 +0800 [thread overview]
Message-ID: <BAY112-F346FA6C04A904B81A0AFEFDAC20@phx.gbl> (raw)
In-Reply-To: <BAY112-F24FF5136B5085B1E4584FBDAC20@phx.gbl>
Now I think I've understood how macro works. A macro is
equivalent to a "function" described as follows:
1. This function has the same body as the macro, and when
calling this function, substitute all arguments with quoted
ones.
2. Then the body of the function is evaluated, and a s-exp
is returned. (`, \, and ,@ are treated as normal functions
here.) All parameters are normal variables that have value
of the orignal arguments.
3. Next, evaluated this s-exp.
This will cause the same effect as the macro.
Thank you, David Kastrup, Andreas Schwab, and Stuart D.
Herring. This is I think the biggest step I made after studying
(Emacs) Lisp.
Regards,
Guanpeng Xu
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next prev parent reply other threads:[~2006-04-12 16:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-12 8:22 Macro vs Function Herbert Euler
2006-04-12 9:07 ` David Kastrup
2006-04-12 9:17 ` Herbert Euler
2006-04-12 9:24 ` David Kastrup
2006-04-12 9:39 ` Herbert Euler
2006-04-12 9:53 ` David Kastrup
2006-04-12 10:39 ` Herbert Euler
2006-04-12 11:14 ` Andreas Schwab
2006-04-12 11:56 ` Herbert Euler
2006-04-12 12:08 ` Herbert Euler
2006-04-12 12:19 ` David Kastrup
2006-04-12 13:37 ` Herbert Euler
2006-04-12 13:52 ` David Kastrup
2006-04-12 15:13 ` Herbert Euler
2006-04-12 15:26 ` Stuart D. Herring
2006-04-12 15:54 ` Herbert Euler
2006-04-12 15:29 ` David Kastrup
2006-04-12 15:56 ` Herbert Euler
2006-04-12 16:14 ` Herbert Euler [this message]
2006-04-12 16:59 ` David Kastrup
2006-04-13 2:17 ` Herbert Euler
2006-04-12 12:12 ` David Kastrup
2006-04-12 11:19 ` David Kastrup
-- strict thread matches above, loose matches on Subject: below --
2006-04-12 12:05 Herbert Euler
2006-04-12 12:13 ` David Kastrup
2006-04-12 12:17 ` Herbert Euler
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