From: Toby Cubitt <tsc25@cantab.net>
To: help-gnu-emacs@gnu.org
Subject: Re: Writing a function/macro in Elisp that generates a function at runtime
Date: Tue, 28 Oct 2008 18:21:20 +0100 [thread overview]
Message-ID: <49074A10.805@dr-qubit.org> (raw)
In-Reply-To: <yoijbpx4r3q8.fsf@remote1.student.chalmers.se>
Johan Bockgård wrote:
> Toby Cubitt <tsc25@cantab.net> writes:
>
>> (defun wrap-insert-function (insfun)
>> `(lambda (new-data old-cell)
>> (setf (cell-data old-cell)
>> (funcall ,insfun new-data (cell-data old-cell)))
>> old-cell))
>
> (lexical-let ((insfun insfun))
> (lambda ...))
Hah! I knew I could do it with closures, and I knew elisp didn't have
them, and I completely forgot that the CL package provided a way of
simulating them. Thanks a lot!
I expect anything else I could come up with would end up being an
ad-hoc, informally-specified, bug-ridden, slow implementation of half of
lexical-let :)
Out of sheer stubborn curiosity, I'd still like to know whether macros
can be used to generate backquote constructs programmatically...
Toby
next prev parent reply other threads:[~2008-10-28 17:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-27 13:30 Writing a function/macro in Elisp that generates a function at runtime Toby Cubitt
2008-10-28 18:09 ` Johan Bockgård
2008-10-28 17:21 ` Toby Cubitt [this message]
[not found] <mailman.2216.1225168079.25473.help-gnu-emacs@gnu.org>
2008-10-28 5:56 ` Barry Margolin
2008-10-28 10:38 ` Toby Cubitt
2008-10-28 12:42 ` Toby Cubitt
[not found] ` <mailman.2265.1225201433.25473.help-gnu-emacs@gnu.org>
2008-10-28 16:47 ` Ted Zlatanov
2008-10-28 17:10 ` Toby Cubitt
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