Re: Another OOP thread; everything on the stack is an object

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: Another OOP thread; everything on the stack is an object
Date	2013-05-17 12:50 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2013May17.145017@mips.complang.tuwien.ac.at> (permalink)
References	<b4066bda-e458-4763-bbd7-446f9f61377f@g9g2000vbl.googlegroups.com> <kn4dhp$bs6$1@dont-email.me>

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Ron Aaron <rambamist@gmail.com> writes:
>It makes sense to me to "do the right thing" where possible, e.g "+" 
>should concatenate strings if the objects on the stack are strings

Really bad example, because this is the wrong thing.  + is for adding
numbers.  Addition has a number of algebraic properties that string
concatenation does not have; in particular, it forms a commutative
group.  I.e., addition is commutative (which string concatenation
obviously is not), and every number has an inverse element
wrt. addition (the negated number).  That's not the case for string
concatenation.

>I'm not certain what representation to use for "real" numbers.  Since I 
>expect to run on Intel and ARM as well (my target platforms are 
>Windows/Mac/Linux and Android/iOS, at first) and perhaps other, unknown 
>CPUs, I don't know if using the IEEE fp formats is supported across the 
>board

It is.  Other formats are going the way of 1s-complement.  However, I
have come across at least one FPU-less ARM which had broken FP
support.

- 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 2013: http://www.euroforth.org/ef13/

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Another OOP thread; everything on the stack is an object Alex McDonald <blog@rivadpm.com> - 2013-05-16 13:37 -0700
  Re: Another OOP thread; everything on the stack is an object Bernd Paysan <bernd.paysan@gmx.de> - 2013-05-17 00:09 +0200
    Re: Another OOP thread; everything on the stack is an object hughaguilar96@yahoo.com - 2013-05-16 18:31 -0700
      Re: Another OOP thread; everything on the stack is an object Alex McDonald <blog@rivadpm.com> - 2013-05-17 05:38 -0700
    Re: Another OOP thread; everything on the stack is an object Alex McDonald <blog@rivadpm.com> - 2013-05-17 05:39 -0700
      Re: Another OOP thread; everything on the stack is an object Bernd Paysan <bernd.paysan@gmx.de> - 2013-05-19 00:09 +0200
        Re: Another OOP thread; everything on the stack is an object Ian Osgood <iano@quirkster.com> - 2013-05-25 11:36 -0700
          Re: Another OOP thread; everything on the stack is an object Paul Rubin <no.email@nospam.invalid> - 2013-05-25 13:10 -0700
  Re: Another OOP thread; everything on the stack is an object Ron Aaron <rambamist@gmail.com> - 2013-05-17 08:04 +0300
    Re: Another OOP thread; everything on the stack is an object Paul Rubin <no.email@nospam.invalid> - 2013-05-16 22:19 -0700
      Re: Another OOP thread; everything on the stack is an object Ron Aaron <rambamist@gmail.com> - 2013-05-17 08:26 +0300
        Re: Another OOP thread; everything on the stack is an object Paul Rubin <no.email@nospam.invalid> - 2013-05-16 22:43 -0700
          Re: Another OOP thread; everything on the stack is an object Ron Aaron <rambamist@gmail.com> - 2013-05-17 09:25 +0300
      Re: Another OOP thread; everything on the stack is an object Mark Wills <markrobertwills@yahoo.co.uk> - 2013-05-17 00:26 -0700
      Re: Another OOP thread; everything on the stack is an object anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-17 13:25 +0000
        Re: Another OOP thread; everything on the stack is an object Bernd Paysan <bernd.paysan@gmx.de> - 2013-05-19 00:34 +0200
          Re: Another OOP thread; everything on the stack is an object visualforth@rocketmail.com - 2013-05-18 15:55 -0700
            Re: Another OOP thread; everything on the stack is an object Bernd Paysan <bernd.paysan@gmx.de> - 2013-05-19 01:27 +0200
            Re: Another OOP thread; everything on the stack is an object Coos Haak <chforth@hccnet.nl> - 2013-05-19 01:35 +0200
    Re: Another OOP thread; everything on the stack is an object Mark Wills <markrobertwills@yahoo.co.uk> - 2013-05-17 00:29 -0700
      Re: Another OOP thread; everything on the stack is an object hughaguilar96@yahoo.com - 2013-05-18 19:38 -0700
    Re: Another OOP thread; everything on the stack is an object Alex McDonald <blog@rivadpm.com> - 2013-05-17 05:40 -0700
      Re: Another OOP thread; everything on the stack is an object Ron Aaron <rambamist@gmail.com> - 2013-05-17 16:18 +0300
    Re: Another OOP thread; everything on the stack is an object anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2013-05-17 12:50 +0000
      Re: Another OOP thread; everything on the stack is an object Paul Rubin <no.email@nospam.invalid> - 2013-05-17 06:09 -0700
      Re: Another OOP thread; everything on the stack is an object Ron Aaron <rambamist@gmail.com> - 2013-05-17 16:25 +0300
  Re: Another OOP thread; everything on the stack is an object alberto@hal-pc.org (Alberto) - 2013-05-17 14:35 +0000
  Re: Another OOP thread; everything on the stack is an object Steve <nospam275@gmail.com> - 2013-05-19 05:48 -0700
  Re: Another OOP thread; everything on the stack is an object Jason Damisch <jasondamisch@yahoo.com> - 2013-05-25 19:56 -0700

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