all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Joost Kremers <joost.m.kremers@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: Concern around use of eval
Date: 20 Mar 2015 19:54:16 GMT	[thread overview]
Message-ID: <slrnmgoun8.6n4.joost.m.kremers@j.kremers4.news.arnhem.chello.nl> (raw)
In-Reply-To: mailman.2305.1426753885.31049.help-gnu-emacs@gnu.org

Tassilo Horn wrote:
> Joost Kremers <joost.m.kremers@gmail.com> writes:
>
>> Why not do it at the top level directly? E.g.:
>>
>> ,----
>> | (defvar lh/labels '("label1" "label2" "label3"))
>> | 
>> | (defmacro lh/gen-predicate (label)
>> |   `(defun ,(intern (concat "lh/" label "-p")) ()
>> |      (member ,label *lh/system-label-store*)))
>> | 
>> | (mapc (lambda (label)
>> |         (lh/gen-predicate label))
>> |       lh/labels)
>> `----
>
> That won't work because.  When reading the mapc form, emacs sees that
> `lh/gen-predicate' is a macro and tries to expand it with the symbol
> label as argument.  The macroexpansion takes place before the actual
> execution of the code.

Thanks, that explains a few things.


-- 
Joost Kremers                                   joostkremers@fastmail.fm
Selbst in die Unterwelt dringt durch Spalten Licht
EN:SiS(9)


  parent reply	other threads:[~2015-03-20 19:54 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-19  6:53 Concern around use of eval Les Harris
2015-03-19  8:00 ` Tassilo Horn
     [not found] ` <mailman.2302.1426752018.31049.help-gnu-emacs@gnu.org>
2015-03-19  8:12   ` Joost Kremers
2015-03-19  8:31     ` Tassilo Horn
     [not found]     ` <mailman.2305.1426753885.31049.help-gnu-emacs@gnu.org>
2015-03-20 19:54       ` Joost Kremers [this message]
2015-03-19 14:07 ` Stefan Monnier
2015-03-20 15:17   ` Thierry Volpiatto
2015-03-20 17:19     ` Bug in Elisp font-locking (was: Concern around use of eval) Tassilo Horn
2015-03-20 17:31       ` Bug in Elisp font-locking Stefan Monnier
2015-03-20 17:43         ` Drew Adams
2015-03-20 18:47         ` Tassilo Horn
2015-03-20 20:38           ` Stefan Monnier
2015-03-20 22:45             ` Tassilo Horn
2015-03-21  0:06               ` Johan Bockgård
2015-03-21  7:26                 ` Tassilo Horn
2015-03-21  2:33               ` Stefan Monnier
2015-03-21  7:55                 ` Tassilo Horn

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=slrnmgoun8.6n4.joost.m.kremers@j.kremers4.news.arnhem.chello.nl \
    --to=joost.m.kremers@gmail.com \
    --cc=help-gnu-emacs@gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.