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From: Marius Amado Alves <amado.alves@netcabo.pt>
Newsgroups: comp.lang.ada
Subject: Re: generic parameter Copy for primitifs types.
Date: Fri, 24 Jun 2005 00:44:08 +0100
Organization: Cuivre, Argent, Or
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Date: 2005-06-24T00:44:08+01:00

> But I want to use Copy for other types other than primitifs (integer,
> float, boolean...). The best solution is to set ":=" by default but it
> is not possible...

If you really want a default you can do it with 2 levels of generics 
and an access-to-subprogram type, as below (not tested). In Ada 2006 I 
think you can do without the access type.

generic
    type T is private;
package Level_1 is
    type Copy_Ptr is access procedure (From : in T; To : out T);
    procedure Default_Copy (From : in T; To : out T);
    generic
       Copy : Copy_Ptr := Default_Copy'Access;
    package Level_2 is
       ...
    end;
end;