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Date: Tue, 01 Mar 2005 20:47:24 +0100
From: Georg Bauhaus <bauhaus@futureapps.de>
Organization: future apps GmbH
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Newsgroups: comp.lang.ada
Subject: Re: generics and records
References: <1109532840.857126.234720@z14g2000cwz.googlegroups.com>
 <8065486.gdOUxkNXWZ@linux1.krischik.com>
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Date: 2005-03-01T20:46:32+01:00
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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. The actual parameter is not a record in
the following example (Natural), but it could be one.

procedure P is

   generic
      type X is private;
   package G is
      type Y is new X;

      -- disallow multiplication and division in type Y

      function "*"(a, b: Y) return Y is abstract;
      function "/"(a, b: Y) return Y is abstract;
   end G;


   package I is new G(Natural);

   use I;

   v: Y := 1;

begin
   v := v + 1;
end P;