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From: AdaMagica <christoph.grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: Preventing type extensions
Date: Fri, 17 Sep 2010 00:04:43 -0700 (PDT)
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On 17 Sep., 02:16, Shark8 <onewingedsh...@gmail.com> wrote:
> Sure, a child-package could be introduced to extend the object, but
> its specification cannot rely on anything not publicly visible in its
> parent's specification... meaning that the public portion of the
> object cannot expose that it is a tagged record. Right?

package X is

  type Final is private;

private

  type Final is tagged null record;

end X;
package X.X is

  type Extended_Final is tagged private;

private

  type Extended_Final is new Standard.X.Final with null record;

end X.X;