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From: jsa@alexandria (Jon S Anthony)
Subject: Re: OO, C++, and something much better!
Date: 1997/01/20
Message-ID: <JSA.97Jan20143509@alexandria>#1/1
X-Deja-AN: 211137449
sender: news@organon.com (news)
references: <E3xprM.4pB@syd.csa.com.au> <E3z0zy.9qL@syd.csa.com.au>
organization: Organon Motives, Inc.
newsgroups: 
 comp.lang.c++,comp.lang.smalltalk,comp.lang.eiffel,comp.lang.ada,comp.object,comp.software-eng
Date: 1997-01-20T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <E47rDG.AC8@ecf.toronto.edu> doylep@ecf.toronto.edu (Patrick Doyle) writes:

> In article <E3z0zy.9qL@syd.csa.com.au>,
> Don Harrison <donh@syd.csa.com.au> wrote:
> >
> >The following is a valid Ada83 program (and presumably valid Ada95):
> >
> >procedure Test_Type_Hole is
> >  subtype Sub_Integer is Integer range 1 .. 10;
> >  I: Integer;
> >  S: Sub_Integer;
> >
> >  procedure Use_Subtype (S: Sub_Integer) is
> >  begin
> >    null;
> >  end;
> >
> >begin
> >  I := 1000;
> >  Use_Subtype (I);       -- System Invalid call - raises 
> >                         -- Constraint_Error at runtime.
> >end Test_Type_Hole;
> >
> >So, contrary to your claim, Ada *does* permit a form of broken polymorphism.
> 
>   To me, this seems more of a broken assertion than broken polymorphism.
> 
>   (However, I've never use Ada in my life... :-)

Well, now this is amusing.  Patrick here states he's never used Ada
in his life, but he gets it _right_!  Nice little piece of anecdotal
evidence for the readability of Ada... :-)

/Jon
-- 
Jon Anthony
Organon Motives, Inc.
Belmont, MA 02178
617.484.3383
jsa@organon.com