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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: How to access parent class/object?
Newsgroups: comp.lang.ada
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Date: Fri, 25 Mar 2005 08:48:24 +0100
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Date: 2005-03-25T08:48:19+01:00
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On 24 Mar 2005 22:57:10 -0800, Adrian Hoe wrote:

> Hi,
> 
> I have the following codes (abbreviated):
> 
> package A is
>    type A_Object is tagged private;
> ...
> end A;
> 
> package B is
>    type B_Object is new A_Object with private;
> ...
> end B;
> 
> package C is
>    type C_Object is new B_Object with private;
> ...
> end C;
> 
> package D is
>    type D_Object is new C_Object with private;
> ...
> end D;
> 
> Now, I have the following declaration:
> 
> My_D_Object is D.D_Object;
> 
> How can I reference the parent objects?
> 
> procedure Process_C (C_Obj : access C_Object);
> procedure Process_D (D_Obj : access D_Object);
> 
> How can I pass C_Object and D_Object into Process_C and Process_D
> respectively given only My_D_Object is D.D_Object?

   My_D_Object : aliased D_Object := ...;

   Process_C (C_Object (My_D_Object)'Access);
   Process_D (My_D_Object'Access);

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