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From: Hacid <chadi.alkurdi@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: limited /non-limited tagged type
Date: Fri, 4 Mar 2011 13:55:26 -0800 (PST)
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Date: 2011-03-04T13:55:26-08:00
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On 4 mar, 21:10, Georg Bauhaus <rm-host.bauh...@maps.futureapps.de>
wrote:
> On 3/4/11 7:56 PM, Hacid wrote:
>
> > I understand why I can't define my type limited in the public part and
> > not limited in the private part. But is there a way to do what I
> > want ?
>
> > Something like :
>
> > package Foo is
>
> > =A0 =A0 type Object is tagged private;
>
> > =A0 =A0 function ":=3D" (Left : out Object,; Right : in Object) is abst=
ract;
> > -- I know this looks strange
>
> > end Foo;
>
> Maybe something along these lines?
>
> package Foo_3 is
>
> =A0 =A0 =A0type Object is tagged limited private;
>
> private
>
> =A0 =A0 =A0type Wrapped is record
> =A0 =A0 =A0 =A0 =A0null; =A0-- ...
> =A0 =A0 =A0end record;
>
> =A0 =A0 =A0procedure Copy_Constructor
> =A0 =A0 =A0 =A0 =A0(Source : =A0in Object;
> =A0 =A0 =A0 =A0 =A0 Target : out Object );
>
> =A0 =A0 =A0type Object is tagged limited
> =A0 =A0 =A0 =A0 =A0record
> =A0 =A0 =A0 =A0 =A0 =A0 =A0Data : Wrapped;
> =A0 =A0 =A0 =A0 =A0end record;
>
> end Foo_3;
>
> package body Foo_3 is
>
> =A0 =A0 =A0procedure Copy_Constructor
> =A0 =A0 =A0 =A0 =A0(Source : =A0in Object;
> =A0 =A0 =A0 =A0 =A0 Target : out Object )
> =A0 =A0 =A0is
> =A0 =A0 =A0begin
> =A0 =A0 =A0 =A0 =A0Target.Data :=3D Source.Data;
> =A0 =A0 =A0end Copy_Constructor;
>
> end Foo_3;

This solution works but if I extend my package with some addons, I am
blocked :

generic
   type Element is new Object with private;
package Foo_3.Pools is

   type Pool is limited private;
   -- Some services

   procedure Copy (From : in Pool; To : out Pool);

private

   type Pool is array (1 .. 1_000) of Element;

end Foo_3.Pools;
--
package body Foo_3.Pools is

   procedure Copy (From : in Pool; To : out Pool) is
   begin
      for I in To'Range loop
         Copy (From =3D> From (I), To =3D> To (I));
         -- This call copy just a part of Element !!!
      end loop;
   end Copy;

end Foo_3.Pools;

Do you see how to resolve this second problem ?

Thanks.