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From: Raffaele Ricciardi <rfflrccrd@gmail.com>
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Subject: EIEIO: how to validate a new instance?
Date: Thu, 02 Aug 2012 17:29:42 +0100
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Hello everyone,

I need to create a new EIEIO object, but not all values are acceptable as
initargs.  My understanding is that I should use initialize-instance for 
checks,
but I can't find the proper incantation to make it work (I even managed 
to make
Emacs crash).

Here is a sample code:

(require 'eieio)

(defclass my-class ()
   ((x :initarg :x
	   :type string )))

So far, so good.  I can instantiate my class:

(setq ^c (my-class "my-class" :x "x"))

Here is one of my attempts at initialize-instance:

(defun initialize-instance ((^c my-class) ^args) nil)

It doesn't work: now I can't instantiate my class anymore:

(setq ^c (my-class "my-class" :x "x"))

Fails with:

 > Debugger entered--Lisp error: (invalid-function (lambda ((^y 
my-class) ^args)
nil))
 > initialize-instance([object my-class "my-class" unbound] (:x "x")) Any
help?  Thank you.