From: Raffaele Ricciardi <rfflrccrd@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: About `funcall'
Date: Mon, 04 Mar 2013 19:12:29 +0000 [thread overview]
Message-ID: <apka0vF9qsgU1@mid.individual.net> (raw)
In-Reply-To: <mailman.21339.1362401601.855.help-gnu-emacs@gnu.org>
On 04/03/13 12:52, 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.
>
(or yank-undo-function 'delete-region)
evaluates to a function, which is either the value of yank-undo-function
or 'delete-region. Compare for instance this snippet, where `add' is a
variable whose value is the function '+:
(let ((add '+))
;; Add if yes, otherwise multiply.
(funcall (if (yes-or-no-p "Add?") add '*) 4 4))
next parent reply other threads:[~2013-03-04 19:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.21339.1362401601.855.help-gnu-emacs@gnu.org>
2013-03-04 19:12 ` Raffaele Ricciardi [this message]
2013-03-04 19:15 ` About `funcall' Pascal J. Bourguignon
[not found] <mailman.21404.1362437985.855.help-gnu-emacs@gnu.org>
2013-03-04 23:23 ` Pascal J. Bourguignon
2013-03-04 22:59 Xue Fuqiao
-- strict thread matches above, loose matches on Subject: below --
2013-03-04 12:52 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
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