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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: ADA Popularity Discussion Request
Date: Wed, 15 Sep 2004 12:05:26 +0200
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Date: 2004-09-15T12:05:26+02:00
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On Wed, 15 Sep 2004 10:30:00 +0100, Martin Dowie wrote:

> Dmitry A. Kazakov wrote:
>> Positive is a subtype of Integer. Integer is a "subtype" of
>> Universal_Integer. Conversion from the base to its subtype may raise
>> Constraint_Error. Wide_Character and Character are related in exactly
>> same manner as Integer and Positive.
> 
> Why do you say that? Positive is defined in package "Standard" as a subtype.
> Wide_Character and Character are defined in package "Standard" as difference
> "type"-s.

Yes, that is my point. It is illogical that they are declared as unrelated
types. One should be a subtype of another. Semantically there is no
difference. Clearly there is a huge technical difference, because Ada 83
requires same representations for S, T and T'Base. Once this limitation
lifted it will be possible either to extend Character enumeration to
Wide_Character, or to constrain Wide_Character to Character, keeping their
T'Size different.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de