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From: kcline17@hotmail.com (Kevin Cline)
Newsgroups: comp.lang.ada
Subject: Re: Why is Ada NOT a good choice for a beginner to programming?
Date: 9 Jan 2003 19:51:58 -0800
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Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de> wrote in message news:<avk4l9$19i$1@a1-hrz.uni-duisburg.de>...
> Wes Groleau <wesgroleau@despammed.com> wrote:
> : 
> : After reading that report, I don't place any value
> : on what he said.  I've used derived types, subtypes,
> : and other abstraction-supporting features of Ada and
> : I _know_ they're valuable.
> 
> 
> One complaint he had was that it be possible to define a Length
> using derived types and still have "*" return values of type Length,
> when it should return an area.  He had a point, hadn't he?
> OTOH, with only structural equivalence of types, and no way to derive
> both an integral length type and an integral area type, that are really
> diferent, how can you build areas into your types, such that the compiler
> will prevent use of values of the wrong type?
> 
> In which languages has this been fixed?

This is relatively easy to do in C++.
See http://www.fnal.gov/docs/working-groups/fpcltf/html/SIunits-summary.html