Advice function needs argument not used in function, how to avoid compiler warning?

Advice function needs argument not used in function, how to avoid compiler warning?

[Jean Louis]

I realize that advice function need argument such as &rest args, but I
am not using it in the function. And I do not understand what is that
argument receiving. Anybody may explain it?

I have to do (ignore args) to avoid compiler warning. What does args receive?

(defun hyperscope-after-sort (&rest args)
  (ignore args)
  (hyperscope-highlight))

(advice-add 'tabulated-list-col-sort :after 'hyperscope-after-sort)
(advice-add 'tabulated-list-sort :after 'hyperscope-after-sort)


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Jean

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Re: Advice function needs argument not used in function, how to avoid compiler warning?

[Michael Heerdegen]

Jean Louis <bugs@gnu.support> writes:

> I realize that advice function need argument such as &rest args, but I
> am not using it in the function. And I do not understand what is that
> argument receiving. Anybody may explain it?
>
> I have to do (ignore args) to avoid compiler warning. What does args
> receive?

The arguments of the current call of the advised function, in the case
of an :after advice.  In the general case that depends on the kind of
advice (see docstring of `advice-add', the HOW arg).

> (defun hyperscope-after-sort (&rest args)
>   (ignore args)
>   (hyperscope-highlight))

You can just use `_args` to label the argument as unused by the function
body - it's the same as for all functions.

Michael.

Re: Advice function needs argument not used in function, how to avoid compiler warning?

[Emanuel Berg]

Jean Louis wrote:

> I have to do (ignore args) to avoid compiler warning.
> What does args receive?
>
> (defun hyperscope-after-sort (&rest args)
>   (ignore args)
>   (hyperscope-highlight))
>
> (advice-add 'tabulated-list-col-sort :after 'hyperscope-after-sort)
> (advice-add 'tabulated-list-sort :after
> 'hyperscope-after-sort)

(defun hyperscope-after-sort (&rest _) ... )

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