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From: Sven <sven.weidauer@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: How to pass around access types to interfaces?
Date: Wed, 29 Oct 2008 05:42:38 -0700 (PDT)
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Date: 2008-10-29T05:42:38-07:00
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On 25 Okt., 16:43, "Martin Krischik" <krisc...@users.sourceforge.net>
wrote:
> Am 24.10.2008, 13:45 Uhr, schrieb Sven <sven.weida...@gmail.com>:
>
> > =A0 type My_Interface_Access is access all My_Interface'Class;
>
> Do you realy need an access type? Read:
>
> http://en.wikibooks.org/wiki/Ada_Programming/Object_Orientation#The_c...

Yes, this needs to be an access type. I need to store references to an
object, not the object itself. As far as I understand Ada this can
only be done via access types. Declaring a record member of type
"My_Interface'Class" is not possible. But even if it was it would
store a copy of the object, which would be incorrect and a waste of
memory.

> If so, does it need to be an access all? Read:
>
> http://en.wikibooks.org/wiki/Ada_Programming/Types/access#Access_vs._...
>
> Six month after I switched from C++ to Ada I removed about 80% access =A0
> types from the code I created until then. And from those access types =A0
> which remained more did not need the "all" and I consequently removed tha=
t =A0
> as well.

"Access all" will allow me to pass references to aliased objects.
Right now there is no reason to disallow that, so I'll keep the "all".