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Re: About `funcall'
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From: |
Raffaele Ricciardi |
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Subject: |
Re: About `funcall' |
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Date: |
Mon, 04 Mar 2013 19:12:29 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130107 Thunderbird/17.0.2 |
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))