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* Should `indirect-function' be preferred over `fboundp'?
@ 2023-07-20  7:08 Ihor Radchenko
  2023-07-20  7:42 ` Eli Zaretskii
                   ` (3 more replies)
  0 siblings, 4 replies; 12+ messages in thread
From: Ihor Radchenko @ 2023-07-20  7:08 UTC (permalink / raw)
  To: emacs-devel

Hi,

I have recently stumbled upon the common Elisp pattern
(when (fboundp func) (funcall func)) failing.

This is happening when a symbol is declared as function alias to
non-existing function:

(defalias 'yant/foo 'yant/bar)
(fboundp 'yant/foo) ; => t
(funcall 'yant/foo) ; => ERROR: Symbol function definition is void: yant/foo

In contrast, `indirect-function' does a better job determining whether a
given symbol can be called as a function:

(indirect-function 'yant/foo) ; => nil

Is it something widely known?
Is it something to worry about?
(I can see that `fboundp' is used all over Emacs git sources, while
`indirect-function' is rarely used)

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>



^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2023-07-23  2:37 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-07-20  7:08 Should `indirect-function' be preferred over `fboundp'? Ihor Radchenko
2023-07-20  7:42 ` Eli Zaretskii
2023-07-20  8:23   ` Ihor Radchenko
2023-07-20  7:47 ` Andreas Schwab
2023-07-20  8:25   ` Ihor Radchenko
2023-07-20 13:02 ` Alan Mackenzie
2023-07-20 13:08   ` Ihor Radchenko
2023-07-21  1:08 ` Michael Heerdegen
2023-07-21  6:07   ` Ihor Radchenko
2023-07-22  2:49     ` Michael Heerdegen
2023-07-22 10:51       ` Ihor Radchenko
2023-07-23  2:37         ` Michael Heerdegen

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