From: Michael Heerdegen <michael_heerdegen@web.de>
To: help-gnu-emacs@gnu.org
Subject: Re: About `funcall'
Date: Mon, 04 Mar 2013 15:11:47 +0100 [thread overview]
Message-ID: <87r4jvl0f0.fsf@web.de> (raw)
In-Reply-To: <mailman.21340.1362401871.855.help-gnu-emacs@gnu.org> (Xue Fuqiao's message of "Mon, 04 Mar 2013 20:57:30 +0800")
Xue Fuqiao <xfq.free@gmail.com> writes:
> On 03/04/2013 08:52 PM, Xue Fuqiao wrote:
> > In `yank-pop', there is an sexp about `funcall':
> >
> > (funcall (or yank-undo-function 'delete-region) (point) (mark t))
> >
> > IIRC the first argument for `funcall' should be a function, so I'm
> > confused with this usage. Can somebody explain it to me? Thanks.
>
> Maybe the first argument is whatever the `or' expression
> returns, so the remaining arguments are passed to it?
Exactly. Note that `funcall' is a _function_, so it evaluates all
arguments first. The first argument should evaluate to a function,
which is then called with the remaining arguments.
This is useful, because unlike in scheme, this:
((or yank-undo-function 'delete-region) (point) (mark t))
won't work in Emacs Lisp.
Note that `apply' behaves analogously, because it's also a function.
Regards,
Michael.
next prev parent reply other threads:[~2013-03-04 14:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-04 12:52 About `funcall' Xue Fuqiao
2013-03-04 12:57 ` Xue Fuqiao
[not found] ` <mailman.21340.1362401871.855.help-gnu-emacs@gnu.org>
2013-03-04 14:11 ` Michael Heerdegen [this message]
[not found] <mailman.21339.1362401601.855.help-gnu-emacs@gnu.org>
2013-03-04 19:12 ` Raffaele Ricciardi
2013-03-04 19:15 ` Pascal J. Bourguignon
-- strict thread matches above, loose matches on Subject: below --
2013-03-04 22:59 Xue Fuqiao
[not found] <mailman.21404.1362437985.855.help-gnu-emacs@gnu.org>
2013-03-04 23:23 ` Pascal J. Bourguignon
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