From: Pascal Bourguignon <pjb@informatimago.com>
To: help-gnu-emacs@gnu.org
Subject: Re: A macro and an unwanted containing list in the resulting form
Date: Wed, 23 May 2007 18:57:40 +0200 [thread overview]
Message-ID: <87abvvv5ob.fsf@thalassa.lan.informatimago.com> (raw)
In-Reply-To: mailman.1069.1179924576.32220.help-gnu-emacs@gnu.org
Sebastian Tennant <sebyte@smolny.plus.com> writes:
>> Is there any reason to make the argument of build-cond an alist? You
>>could try
>>
>> (defmacro build-cond (&rest conds)
>> (append '(cond)
>> (mapcar '(lambda (each)
>> (cons (list 'equal 'my-var (car each)) (list (cdr each))))
>> conds)))
>>
>> and then use
>>
>> (build-cond ("hello" . (message "hi"))
>> ("goodbye" . (message "bye"))
>
> The reason for the alist is the clauses are being passed as one of a
> number of arguments to a function call.
If you get the a-list as argument to a function, then you don't need a
macro to process it! Just write a loop!
(require 'cl)
(defun my-function (string clauses)
(loop
for clause in clauses
until (string= string (car clause))
finally (eval (cdr clause))))
(my-function "goodbye" '(("hello" . (message "hi"))
("goodbye" . (message "bye"))))
--
__Pascal Bourguignon__ http://www.informatimago.com/
NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.
next prev parent reply other threads:[~2007-05-23 16:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-23 11:28 A macro and an unwanted containing list in the resulting form Sebastian Tennant
2007-05-23 11:39 ` Juanma Barranquero
2007-05-23 12:51 ` Sebastian Tennant
2007-05-23 13:14 ` Juanma Barranquero
2007-05-23 21:40 ` Sebastian Tennant
[not found] ` <mailman.1069.1179924576.32220.help-gnu-emacs@gnu.org>
2007-05-23 16:57 ` Pascal Bourguignon [this message]
2007-05-23 21:45 ` Sebastian Tennant
[not found] ` <mailman.1113.1179959874.32220.help-gnu-emacs@gnu.org>
2007-05-24 8:47 ` Tim X
2007-05-24 13:49 ` Sebastian Tennant
2007-05-24 16:12 ` Johan Bockgård
[not found] <mailman.1062.1179919591.32220.help-gnu-emacs@gnu.org>
2007-05-23 12:04 ` Pascal Bourguignon
2007-05-23 21:32 ` Sebastian Tennant
[not found] ` <mailman.1104.1179956594.32220.help-gnu-emacs@gnu.org>
2007-05-23 23:48 ` Pascal Bourguignon
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