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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Thu, 14 Mar 2013 17:12:28 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2013-03-14T17:12:28-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:1wv3p3nrtejfk$.bwebhg9agt0l.dlg@40tude.net...
> On Thu, 14 Mar 2013 17:21:23 +0100, J-P. Rosen wrote:
...
>> The set of values is not defined by Positive, it is defined by Integer.
>
> Still, Positive has values, and operations.

Yes, and they're exactly the same set as Integer has. The values and 
operations of a type determine what is statically allowed (that is, what is 
legal). And for the purposes of legality, Integer and Positive are exactly 
the same.

There are some differences in *dynamic* behavior, but that has nothing to do 
with the available values and operations. (The text you quoted from the RM 
about values "belonging" to a subtype is defining dynamic behavior.) I 
recall some Dmitry guy telling us that dynamic behavior is different from 
static behavior, and even claiming that dynamic behavior cannot constitute a 
contract. So it if is not a *contract*, how come it matters for a *type* 
(which is an integral part of describing a contract)?

                                                                 Randy.