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Re: Question about cl-flet and cl-letf
From: |
Michael Heerdegen |
Subject: |
Re: Question about cl-flet and cl-letf |
Date: |
Sun, 29 Oct 2023 02:14:10 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) |
Arash Esbati <arash@gnu.org> writes:
> Michael Heerdegen <michael_heerdegen@web.de> writes:
>
> > 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.
>
> Thanks for your response. I basically want to temporarily make
> `y-or-n-p' act like `always'; and from what I read in the docstrings,
> both version should work, but `cl-flet' does not. Are the bindings
> relevant in this case?
Yes. Please read about scoping rules:
(info "(elisp) Variable Scoping")
the analogue rules apply for function bindings.
When the call of `y-or-n-p' does not occur textually inside the
`cl-flet' form, it will not be affected by a lexical function binding.
Michael.