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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Surprise in array concatenation
Date: 06 Sep 2005 17:32:35 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Date: 2005-09-06T17:32:35-04:00
List-Id: <comp.lang.ada>

Georg Bauhaus <bauhaus@futureapps.de> writes:

> What nonsensical values are returned in text like "A'First .. A'Last"
> when A'First > A'Last? The fact that A'First doesn't always refer
> to an element is not different from the fact that A'Length / 2
> doesn't always refer to an element, even when the array isn't empty.
> Of what use is the test A'Length = 0 in this case?

I agree.  The idea that A'Range should mean anything other than
A'First..A'Last seems like a bad idea.  Making A'First raise an
exception in the empty case is just a tripping hazard.

- Bob