Re: generics and records

[Georg Bauhaus <bauhaus@futureapps.de>]

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;