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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Generic procedures and their parameters
Newsgroups: comp.lang.ada
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Date: Wed, 6 Sep 2006 17:09:53 +0200
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On Wed, 06 Sep 2006 16:14:07 +0200, Maciej Sobczak wrote:

>> Why is that shaky?  Integer IS ordered.
> 
> Is it also tagged? Do you want it to be?

Not Integer, but Integer'Class.

> Integer is not only Ordered. It's also Summable, Subtractable, 
[...]

Yes, it is called multiple inheritance.

> In C++ the fact 
> that int is ordered does not require that it relates to some Ordered 
> class.

Which is unfortunate for both C++ and Ada, because "to be ordered" = "a
member of Ordered class." There is no obvious reason why they should be
different.

>> A hierarchy with Object at the top would be a Good Thing, IMHO.  Trees
>> are more aesthetically pleasing than forests.
> 
> Opinions vary on this subject. :-)

One does not exclude other. Ada provides a powerful type cloning mechanism
(I mean: type X is new Y, unfortunately not for types, which are visibly
tagged). You can take a branch and plant it as a new tree.

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