From: Michael Heerdegen <michael_heerdegen@web.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Question about cl-flet and cl-letf
Date: Thu, 26 Oct 2023 23:53:09 +0200 [thread overview]
Message-ID: <87pm11aw56.fsf@web.de> (raw)
In-Reply-To: m2edhh6t74.fsf@macmutant.fritz.box
Arash Esbati <arash@gnu.org> writes:
> Hi all,
>
> my understanding of the manual and docstring of the macros mentioned
> above is that these two pieces of code should be equivalent:
>
> (cl-flet ((y-or-n-p #'always))
> (while (...)
> BODY))
>
> (cl-letf (((symbol-function 'y-or-n-p) #'always))
> (while (...)
> BODY))
>
> I have an use-case where they are not. Before getting into details
> about the function (which is long) and trying to come up with a reduced
> version: Am I correct with the assumption above?
No - they very different. `cl-flet' creates lexical bindings. Your
`cl-letf' call OTOH temporarily changes the function binding of the
symbol `y-or-n-p' - which more or less gives you dynamical binding.
Michael.
next prev parent reply other threads:[~2023-10-26 21:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 20:10 Question about cl-flet and cl-letf Arash Esbati
2023-10-26 21:53 ` Michael Heerdegen [this message]
2023-10-28 21:07 ` Arash Esbati
2023-10-29 0:14 ` Michael Heerdegen
2023-10-29 6:19 ` tomas
2023-10-31 9:38 ` Arash Esbati
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