Re: How to pass around access types to interfaces?

[Sven <sven.weidauer@gmail.com>]

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>:
>
> >   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  
> types from the code I created until then. And from those access types  
> which remained more did not need the "all" and I consequently removed that  
> 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".