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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Is this expected behavior or not
Date: Thu, 14 Mar 2013 16:42:24 +0000
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Date: 2013-03-14T16:42:24+00:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Wed, 13 Mar 2013 21:28:03 +0000, Simon Wright wrote:
>
>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>> 
>>> You need (<>) as an ancestor of both mod <> and range <> in packages
>>> that should be instantiated with either integer or modular type.
>> 
>> I don't understand this.
>
> Let you have a generic package you wanted to be able o instantiate with
> either Unsigned_16 or Integer. The formal generic type for that is formal
> discrete. E.g.
>
> generic
>    type Index_Type is (<>);
>    type Element_Type is private;
> package Generic_Array is ...

Oh. When you used the word 'ancestor' I thought you were talking about
inheritance or type derivation.