From: Drew Adams <drew.adams@oracle.com>
To: Heime <heimeborgia@protonmail.com>
Cc: Michael Heerdegen <michael_heerdegen@web.de>,
"help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
Subject: RE: [External] : Re: Passing result of macroexpand-all as argument to a function
Date: Wed, 9 Aug 2023 21:24:36 +0000 [thread overview]
Message-ID: <SJ0PR10MB54887E09BD315DFE74CF506EF312A@SJ0PR10MB5488.namprd10.prod.outlook.com> (raw)
In-Reply-To: <KGvqMT4ZY4wlobuEGBT2xo_bP12CyYsDrJI39q-S6v-kYPScUn6ZRL-BPB22Q8zd0_zF6U7uo-ck1bwna6mquD_rQov2pzR9femhO5nnKvg=@protonmail.com>
> The usefulness of macroexpand seems to be the ability to output
> up to a specific expansion level, that's all.
Two main uses of macro expansion:
1. For coders, to debug their macro definitions.
Expansion lets you see the code you're telling
the macro to produce.
2. For byte-compilation, so for performance.
As I mentioned the expanded code gets substituted
for the source macro call, in line. (Nay, its
byte-compilation gets substituted.)
For #1 you as a developer call `macroexpand'.
For #2 code in the byte-compiler calls it (in
effect).
> > If you byte-compile the Lisp source code then the
> > macro call gets macroexpanded during compilation,
> > and the result of expansion is then compiled to
> > produce the byte-compiled code. In effect, the
> > macro-call source code disappears and is replaced
> > by the expansion, in line, and the resulting code
> > is then byte-compiled.
next prev parent reply other threads:[~2023-08-09 21:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 0:22 Passing result of macroexpand-all as argument to a function Heime
2023-08-09 1:37 ` Pierre Rouleau
2023-08-09 2:04 ` Heime
2023-08-09 2:26 ` Corwin Brust
2023-08-09 2:40 ` Heime
2023-08-09 2:27 ` [External] : " Drew Adams
2023-08-09 2:53 ` Heime
2023-08-09 4:02 ` Pierre Rouleau
2023-08-09 4:14 ` Drew Adams
2023-08-09 3:37 ` Michael Heerdegen
2023-08-09 4:13 ` Heime
2023-08-09 4:36 ` Michael Heerdegen
2023-08-09 4:54 ` Heime
2023-08-09 15:21 ` Drew Adams
2023-08-09 4:28 ` Drew Adams
2023-08-09 3:39 ` Michael Heerdegen
2023-08-09 5:06 ` Heime
2023-08-09 15:27 ` [External] : " Drew Adams
2023-08-09 20:34 ` Heime
2023-08-09 21:24 ` Drew Adams [this message]
2023-08-09 21:32 ` Heime
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