Re: Arbitrary function: find the number(s) of expected arguments

[Michael Heerdegen]

Eli Zaretskii <address@hidden> writes:

> Patches to add func-arity to Emacs are welcome.

Question: Is this a reasonable way to go?  Will `func-arity' be a good
solution for the issues we discussed here?

For example, if

(defun f (a b) (list a b))

(defalias 'g (apply-partially #'f 1))

what would (func-arity 'g) return?  Would that be useful?

What would it return for adviced functions?  An advice can change the
arity of a function.  Most do not, but most advices have an &rest args
signature.  Any function can be adviced.

My question is if it is a good idea to invite users to rely on something
like `func-arity'.


Michael.