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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: generics and records
Newsgroups: comp.lang.ada
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 <8065486.gdOUxkNXWZ@linux1.krischik.com>
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Date: Tue, 1 Mar 2005 21:17:28 +0100
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Date: 2005-03-01T21:17:25+01:00
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On Tue, 01 Mar 2005 20:47:24 +0100, Georg Bauhaus wrote:

> Martin Krischik wrote:
> 
>>>generic
>>> type x is private;
>> 
>> You need a common ancestor class for this construct to work:
>> 
>> type x is new y with private;
>> 
>> 
>>>package ...
>>>private
>>> type xx is new x;
>>>end ...
> 
> Yes and no.

Rather no than yes. The following is illegal:

generic
   type X is new Baz with private;
package Foo is
   type XX is new X;
end Foo;

For whatever sad reasons but type cloning using "type X is new Y;" is not
allowed for publicly tagged types.

Personally I would prefer

   subtype X is Y with Z;

to present

   type X is new Y with Z;

and treat the latter rather as:

   type X is new Y with Z;
= subtype <anonymous> is Y with Z;
   type X is new <anonymous>;

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