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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: Tue, 28 Jun 2005 12:21:34 +0100
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Date: 2005-06-28T12:21:34+01:00

> The access type is unnecessary.  The feature you want here has been
> available since Ada83:
>
> generic
>    type T is private;
> package P is
>    procedure Default_Copy (From : in T; To : out T);
>
>    generic
>       with procedure Copy (From : in T; To : out T) is Default_Copy;
>    package Q is ...;
> end P;

Of course. What was I thinking? It's right there on RM95 12.6(2). I 
hope the original poster is still listening, as surely this is the best 
idiom.

I know what I was thinking. I was under the influence of a recent case 
of (non-generic) subprograms with access-to-subprogram parameters with 
defaults. Here you do need access types in Ada 95. Will the anonymous 
access-to-subprogram types of Ada 2006 allow defaults?