Re: How to pass around access types to interfaces?

["Martin Krischik" <krischik@users.sourceforge.net>]

Am 26.10.2008, 00:15 Uhr, schrieb Robert A Duff  
<bobduff@shell01.theworld.com>:

> "Martin Krischik" <krischik@users.sourceforge.net> writes:
>
>> Am 24.10.2008, 13:45 Uhr, schrieb Sven <sven.weidauer@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_class-wide_type
>>
>> If so, does it need to be an access all? Read:
>
> In my experience, access-to-class-wide types almost always need to have
> "all", because you often want to convert from access-to-T2 up to
> access-to-T1'Class (where T2 is a descendant of T1).

I guess you are right here. But then: access to class wide is the kind of  
access which a C++ convert will uses without realy needing them. I should  
know, I am a C++ convert who made precisely that mistake.

Martin

-- 
Martin Krischik