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From: AdaMagica <christ-usch.grein@t-online.de>
Newsgroups: comp.lang.ada
Subject: Re: Derived private interface
Date: Mon, 4 Jul 2011 22:10:37 -0700 (PDT)
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Date: 2011-07-04T22:10:37-07:00
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   type My_Interface is interface;
   procedure Doit (O : access My_Interface) is abstract;

   type Derived_Class is new My_Interface with private;
   procedure Doit (X: access Derived_Class);

[...]
private
   type Derived_Class is new My_Interface with record
     First_Record : Integer;
   end record;