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From: Admin - Do Not Email <asmentis@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: child packages and nested packages
Date: Thu, 4 Mar 2010 06:55:07 -0800 (PST)
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Date: 2010-03-04T06:55:07-08:00
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On Mar 4, 12:37=A0am, Oliver Kellogg <okell...@users.sourceforge.net>
wrote:
> Referring back tohttp://groups.google.com/group/comp.lang.ada/msg/c14a79f=
7d21f5ebf,
>
> Hello CLA,
>
> How come child packages are only possible for library level packages?
>
> I now encountered a situation where I'd like to create a child
> package of a nested package:
>
> -- file: pkg.ads
> package Pkg is
>    package Nested is
>       type Object is tagged null record;
>    end Nested;
> end Pkg;
>
> -- file: pkg-nested-child.ads
> package Pkg.Nested.Child is
>    type Derived is new Object with null record;
> end Pkg.Nested.Child;

I can't tell you *why* that's not allowed, but your supposition about
additional work for the compiler makes sense.  In this case, would the
following work for you?:

-- file: nested_child.ads
with Pkg; use Pkg;
use  Pkg.Nested;

package Nested_Child is
   type Derived is new Object with null record;
end Nested_Child;