Re: [eieio] :before and :after methods not called

"Eric M. Ludlam" <[email protected]> writes:

>   I checked in changes to eieio to do this mechanism for method calls.
> I submitted a new test file for methodinvocation tests.

  Good news.

>   While I was there, I wrote tests for multiple-inheritance of the
> same sort.  It seemed call-next-method did not call all subclass's
                                                          ^^^^^^^^
> method which confused me some.  I couldn't find anything in the common
> list hyperspec on it during a short futile search.  If you know what
> it should do in that case, I'd like to know.

  [ I guess you mean "superclass". ]

  I think you can take a look at "7.6.6.1 Determining the Effective
Method" and "7.6.6.2 Standard Method Combination".

  Basically, the idea is to build a *sorted* list of applicable
methods.  call-next-method simply call the next method in this list.

  By example, in the following:

    (defclass A () ())
    (defclass B () ())
    (defclass C (A B) ())

    (defmethod f ((A a))      ;; 1
      (message "A")
      (when (next-method-p)
        (call-next-method)))

    (defmethod f ((B b))      ;; 2
      (message "B")
      (when (next-method-p)
        (call-next-method)))

    (defmethod f ((C c))      ;; 3
      (message "C")
      (when (next-method-p)
        (call-next-method)))

  The list is (3 1 2) -- I think there is a specific notation I don't
remember, so I use numbers.  It's not (3 2 1) because A stands on the
left, and B on the right, so A takes precedence over B.  It begins
with 3 because C is the most derived class.

  Once you've got this list, the standard method combination says to
call only the first one.  And call-next-method call the next method in
this list.

  [ Note I speak only about standard method combination.  I don't know
    enough what appens in other method combination types, regarding
    inheritance. ]

--drkm



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