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From: Martin <martin.dowie@btopenworld.com>
Newsgroups: comp.lang.ada
Subject: Re: unsigned type
Date: Mon, 29 Jun 2009 03:10:31 -0700 (PDT)
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Date: 2009-06-29T03:10:31-07:00
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On Jun 29, 9:54=A0am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Mon, 29 Jun 2009 01:42:31 -0700 (PDT), Martin wrote:
> > On Jun 29, 12:08=A0am, a...@anon.org (anon) wrote:
> >> And as for Natural, well, that is the definition of a String's index a=
nd in most
> >> cases you use Naturals in "for loop' statements.
>
> > Why would you do that?
>
> > If you iterating over an array object (e.g. a String), you should use
> > 'Range, e.g.
>
> > =A0 =A0for I in My_Array'Range loop
> > =A0 =A0 =A0 -- whatever
> > =A0 =A0end loop;
>
> Exactly. However there are cases like copying element of one array into
> another, when you have to specify the index type explicitly. I always
> wished an attribute Index, which for arrays would yield the index subtype
> of the array:
>
> =A0 =A0Index : A'Index;
>
> Another issue is shifted views of arrays. E.g. when you get two arrays A
> and B, you could bring them to a coherent index range.

True but that hardly fits the billing of "most cases" cited by
'anon'...

Cheers
-- Martin