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From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Newsgroups: comp.lang.ada
Subject: Re: Announce: Grace project site operational
Date: 17 May 2002 12:48:19 -0400
Organization: NASA Goddard Space Flight Center (skates.gsfc.nasa.gov)
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Date: 2002-05-17T16:55:22+00:00
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Fraser Wilson <newsfraser@blancolioni.org> writes:

> Mark Biggar <mark.a.biggar@attbi.com> writes:
> 
> > Ada 95 provides a way to
> > turn off such implicit definitions like so:
> > 
> > type Metres is new Float;
> > -- kill unwanted ops
> > function "*"(Left, Right: Metres) return Metres is abstract;
> > function "/"(Left, Right: Meters) return Metres is abstract;
> > -- define wanted ops
> > function "*"(Left, Right: Metres) return Area;
> > function "*"(Left: Float, Right: Metres) return Metres;
> 
> This doesn't resolve the ambiguity of
> 
>    X : Metres;
>    X := 2.0 * X;
> 
> ... it just prevents you from compiling a program that makes an 
> unambiguous call to the unwanted operations.

Which is essential, so the tool should declare these abstract
operations. 

-- 
-- Stephe