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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: A new notion: stronglly-typed-by-user language
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Date: Fri, 16 Apr 2010 23:51:14 +0200
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Date: 2010-04-16T23:51:14+02:00
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On Fri, 16 Apr 2010 22:53:04 +0200, Pascal Obry wrote:

> Le 16/04/2010 19:24, Dmitry A. Kazakov a �crit :
>> BTW, the Ada's OO kernel has this same design flaw. You can clone all
>> types, but tagged:
>> 
>>    type Count is new Current; -- This is OK only if Current is not tagged!
> 
> type Count is new Current with null record;

That would not create an unrelated type, the class is same.

   function "+" (Left : Current; Right : Current'Class) return Current;

   X : Current;
   Y : Count;
begin
   X := X + Y; -- No type error

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