Re: Message-not-understood and stack effects

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: Message-not-understood and stack effects
Date	2012-05-03 09:14 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2012May3.111458@mips.complang.tuwien.ac.at> (permalink)
References	(5 earlier) <9d0c8e14-61ee-446d-8992-c57eb3ce2bbc@h5g2000vbx.googlegroups.com> <jnqv4f$3jo$1@speranza.aioe.org> <svudneCcUr0fhzzSnZ2dnUVZ_uqdnZ2d@supernews.com> <2012May2.142342@mips.complang.tuwien.ac.at> <rZSdnez_Ta6UpzzSnZ2dnUVZ_jCdnZ2d@supernews.com>

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Andrew Haley <andrew29@littlepinkcloud.invalid> writes:
>Anton Ertl <anton@mips.complang.tuwien.ac.at> wrote:
[...]
>I really don't think that a composite DrawableObject would respond to
>any message it doesn't understand by passing it to its sub-objects
>because it doesn't make sense to do so.  Sure, "draw" makes sense, but
>"getPos" and "getSize" really don't.

It depends on the aggregation/reduction used.  But yes, one would
probably not want to deal with that through a general NOT-UNDERSTOOD
mechanism, but by defining getPos and getSize for the collection class
(or the class that contains the collection).

>In order for those methods to
>work correctly, you have to override them.  It makes sense for the
>NOT-UNDERSTOOD method to throw an exception, so you can see that you
>forgot to implement "getSize".

Ok, so the reason not to make use of NOT-UNDERSTOOD for collections is
better error recognition.

>> The funny thing about that posting is that, if it was intended to
>> demonstrate that one cannot productively discuss technical issues
>> concerning features that one considers a bad idea, it failed.
>
>I don't imagine for a nanosecond that was the intention.

I think the intention was that I should react with "This is a terrible
idea" and not discuss the technical question he posted.  That failed.
It's a bad idea (but he knew that, so no need to point that out), but
the question and its answer still offers some insights.

What do you think the intention was?

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2011: http://www.euroforth.org/ef11/

Thread

Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-17 13:16 +0000
  Re: Message-not-understood and stack effects "A. K." <akk@nospam.org> - 2012-04-17 18:20 +0200
    Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-17 16:37 +0000
      Re: Message-not-understood and stack effects vandys@vsta.org - 2012-04-17 17:43 +0000
      Re: Message-not-understood and stack effects Alex McDonald <blog@rivadpm.com> - 2012-04-17 10:40 -0700
  Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-04-17 12:41 -0500
    Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-18 09:48 +0000
      Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-04-18 05:59 -0500
        Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-18 08:52 -0700
        Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-19 11:47 +0000
          Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-04-19 07:50 -0500
            Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-19 07:14 -0700
              Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-04-19 09:31 -0500
            Re: Message-not-understood and stack effects Bernd Paysan <bernd.paysan@gmx.de> - 2012-04-19 19:31 +0200
            Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-20 10:17 +0000
              Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-20 07:52 -0700
                Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-20 15:26 +0000
                Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-24 06:09 -0700
                Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-24 16:52 +0000
                Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-28 18:38 -0700
                Re: Message-not-understood and stack effects "Rod Pemberton" <do_not_have@notemailnot.cmm> - 2012-04-29 00:19 -0400
                Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-04-29 11:16 -0700
                Re: Message-not-understood and stack effects "Rod Pemberton" <do_not_have@notemailnot.cmm> - 2012-04-29 21:55 -0400
                Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-05-01 14:44 -0700
                Re: Message-not-understood and stack effects "Rod Pemberton" <do_not_have@notemailnot.cmm> - 2012-05-02 05:35 -0400
                Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-05-02 06:29 -0500
                Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-05-02 12:23 +0000
                Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-05-02 08:43 -0500
                Re: Message-not-understood and stack effects Doug Hoffman <glidedog@gmail.com> - 2012-05-02 11:06 -0400
                Re: Message-not-understood and stack effects Bernd Paysan <bernd.paysan@gmx.de> - 2012-05-03 18:41 +0200
                Re: Message-not-understood and stack effects Doug Hoffman <glidedog@gmail.com> - 2012-05-03 13:07 -0400
                Re: Message-not-understood and stack effects Bernd Paysan <bernd.paysan@gmx.de> - 2012-05-04 02:46 +0200
                Re: Message-not-understood and stack effects Doug Hoffman <glidedog@gmail.com> - 2012-05-03 22:09 -0400
                Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-05-03 09:14 +0000
                Re: Message-not-understood and stack effects Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-05-03 04:33 -0500
                Re: Message-not-understood and stack effects Mark Wills <markrobertwills@yahoo.co.uk> - 2012-05-02 12:58 -0700
                Re: Message-not-understood and stack effects vandys@vsta.org - 2012-05-02 20:43 +0000
                Re: Message-not-understood and stack effects Mark Wills <markrobertwills@yahoo.co.uk> - 2012-05-02 13:48 -0700
                Re: Message-not-understood and stack effects John Passaniti <john.passaniti@gmail.com> - 2012-05-03 10:42 -0700
                TypoForth (was: Message-not-understood and stack effects) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-30 13:47 +0000
                Re: TypoForth (was: Message-not-understood and stack effects) BruceMcF <agila61@netscape.net> - 2012-04-30 08:38 -0700
                Re: TypoForth (was: Message-not-understood and stack effects) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-30 16:23 +0000
                Re: TypoForth (was: Message-not-understood and stack effects) BruceMcF <agila61@netscape.net> - 2012-04-30 09:41 -0700
                Re: TypoForth (was: Message-not-understood and stack effects) John Passaniti <john.passaniti@gmail.com> - 2012-05-01 14:53 -0700
  Re: Message-not-understood and stack effects anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-04-21 12:34 +0000

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