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bug#20420: 25.0.50; eieio methods with optional arguments now fail
From: |
Stefan Monnier |
Subject: |
bug#20420: 25.0.50; eieio methods with optional arguments now fail |
Date: |
Sat, 25 Apr 2015 10:41:40 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
>> Hmmm... I think this really only worked by accident and wasn't
>> explicitly supported by Emacs-24's doc. And adding support for such
>> degenerate methods might not be straightforward in eieio-compat.el, so
>> I'm wondering where you've seen such use, to see how important it is to
>> provide that level of backward compatibility.
> I was using function xx that, when called with no arguments, dispatched
> methods with the same name on a local object in the current buffer.
That tells me *how* you used it, not *where*.
> As we are on this topic how about allowing for implicit dispatch on the
> arbitrary context? I mean something along the following lines:
Quoting from cl-generic.el:
;; TODO:
[...]
;; - A way to dispatch on the context (e.g. the major-mode, some global
;; variable, you name it).
[...]
;;; Just for kicks: dispatch on major-mode
;;
;; Here's how you'd use it:
;; (cl-defmethod foo ((x (major-mode text-mode)) y z) ...)
;; And then
;; (foo 'major-mode toto titi)
;;
;; FIXME: Better would be to do that via dispatch on an "implicit argument".
;; E.g. (cl-defmethod foo (y z &context (major-mode text-mode)) ...)
IOW, patch welcome.
Stefan