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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Ada: Inheritance of generics
Newsgroups: comp.lang.ada
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Date: Mon, 2 Jun 2008 17:09:44 +0200
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Date: 2008-06-02T17:09:44+02:00
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On Mon, 02 Jun 2008 16:17:48 +0200, Dennis Hoppe wrote:

> Dmitry A. Kazakov wrote:
>> On Mon, 02 Jun 2008 15:39:05 +0200, Dennis Hoppe wrote:
>> 
>>> -- child unit
>>> generic
>>>    -- omitted
>>> package Generic_Child is
>>>    type Object is new Generic_Parent.Object with private;
>> 
>> This is illegal. Generic_Parent is a generic unit, you cannot refer to
>> anything within it without either instantiation of, or else from a generic
>> child unit of. Generic_Child is not a child package of Generic_Parent.
> 
> Hmm...this line is really a left over from simple inheritance without 
> generic unit, but the Ada compiler does not complain about it.

Then get another compile. The following:

generic
   type Modular_Type is mod <>;
package Generic_Parent is
   type Object is abstract tagged limited null record;
   function Example return Integer;
end Generic_Parent;

with Generic_Parent;
generic
   -- omitted
package Generic_Child is
   type Object is new Generic_Parent.Object with private;
   function Example return Integer;
end Generic_Child;

compiled by GNAT ends up with::

generic_child.ads:5:23: invalid prefix in selected component
"Generic_Parent"

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