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From: "Ekkehard Morgenstern" <ekkehard.morgenstern@onlinehome.de>
Newsgroups: comp.lang.ada
Subject: Question about OO programming in Ada
Date: Tue, 25 Nov 2003 20:04:02 +0100
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Date: 2003-11-25T20:04:02+01:00
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Hi guys,

I have a question about object-oriented programming in Ada:

Do I have to use class-wide types for object-oriented programming, or could
I use regular access types?

Like, when I declare a procedure

    procedure A ( B: in access all T'Class )

could I use a different method and still get all the benefits of Ada
object-oriented programming?

Like, what about:

    procedure A ( B: in access all T )

or

    procedure A ( B: in out T )

or

    procedure A ( B: in T )

Also, if I use access types, should I create new types or declare them
directly in the procedure/function, and what about the 'all' access
qualifier, should I create two types of access types (one with 'access' and
one with 'access all'), or should I declare them directly in the procedure
and decide individually what kind of access I need?

I would like to program as cleanly as possible in Ada right from the start,
so I'd be glad if someone could give me some hints. :-)