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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 15:51:05 +0200
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Date: 2008-06-02T15:51:06+02:00
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On Mon, 02 Jun 2008 15:39:05 +0200, Dennis Hoppe wrote:

> I managed to implement a generic parent class and create a generic unit, 
> which is a child of the first one. I wonder, why I have access to 
> procedures and functions of the parent class, if I am "within" the child 
> unit, but if I am "outside", the compiler complains that no selector for 
> a specified function exists.
> 
> -- generic parent
> 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;
> 
> -- 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.

P.S. Except for trivial cases, it is always better to post complete code
samples.

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