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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: Question about base types
Date: 1997/02/11
Message-ID: <dewar.855670914@merv>#1/1
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references: <mheaney-ya023280002601971414080001@news.ni.net>
 <E4oE3q.1tq@world.std.com> 	<mheaney-ya023280003001970055250001@news.ni.net>
 	<EACHUS.97Feb3221558@spectre.mitre.org> <dewar.855063927@merv>
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 <32FB5B4A.1B95@elca-matrix.ch> <dewar.855436075@merv>
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organization: New York University
newsgroups: comp.lang.ada
Date: 1997-02-11T00:00:00+00:00
List-Id: <comp.lang.ada>


Robert said

   <<type Real is digits 7 range 0.0 .. 1.0;

   as in the original result, you will still get an unconstrained 7 digit
   base type.>>

Mats said

<<Now I know that this is not true for any reasonable implementation
  because floating point base types are always created from a finite set
  of representations available on the machine, but according to the RM
  there could exist a legal implementation of Ada 95 for which 100.0 is a
  possible value of Real'Base in variant (2) but not in variant (1). Or am
  I missing soemthing ? (If I am, then the RM is confusing).>>

Robert says

I was definitely only talking about imaginable implementations. You cannot
imagine an implementation that has a 7 digit floating machine type which
excludes the value 100.0.

That's in the same realm as noting that the above declaration may raise
Storage_Error!

And I see nothing in the RM that would stop you choosing this base type
in both cases if your machine actually had it!