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From: Lothar Scholz <llothar@mailandnews.de>
Subject: Re: The best thing/greatest feature summary
Date: 2000/11/24
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Date: 2000-11-24T00:00:00+00:00
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On Fri, 24 Nov 2000 13:15:00 +1100, Peter Horan <peter@deakin.edu.au>
wrote:

>Lothar Scholz wrote:
>> 
>> On Fri, 27 Oct 2000 17:08:14 -0500, Wes Groleau
>> <wwgrol@ftw.rsc.raytheon.com> wrote:
>> >
>> >Since I didn't learn much, anyone game for an alternate question?
>> >Let X your favorite and Y the other (of Ada or Eiffel).  What is
>> >the one feature (if any) of Y that you wish was in X ?
>> 
>> X := Eiffel
>> Y := Common Lisp
>> 
>> If wish that the :before :after method to patch a method would
>> be in Eiffel.
>
>What about
>
>class A
>feature
>    f is
>        do
>            -- body
>        end
>end
>
>class B
>inherit A
>    redefine f
>feature
>    f is
>        do
>            -- stuff done before
>            Precursor  -- execute the original body
>            -- stuff done after
>        end

But you can't add this to a feature dynamically and you must change
the inheritance hierarchie. This is definitely not the purpose of the
before/after methods. Have a look at what is now known as aspect
oriented programming and you will find that eiffel and most other
languages (expect Java and Lisp) really sucks in this area.

Perhaps someone will implement an eiffel aspect weaver as a Ph.D.
thesis. But eiffel is so less used that i don't really expect anything
- it looks that everybody is on the java side.