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From: "David Botton" <David@Botton.com>
Subject: Re: friend classes in ada95
Date: 2000/04/16
Message-ID: <mvnK4.4943$I75.3573293@news-east.usenetserver.com>#1/1
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References: <38F6B617.34E216A7@emw.ericsson.se> <38F887AE.8CDA24E0@acm.org>
 <8dc8oi$kda$1@nnrp1.deja.com>
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Newsgroups: comp.lang.ada
Date: 2000-04-16T00:00:00+00:00
List-Id: <comp.lang.ada>

If I had the time I would modify GNAT even if just for my own use to add
support for something like:

class type X is new Y with
    interface
        A, B
    record
        new_var : abc;
    end record;

and

interface type ABC;

procedure A_Func (This : ABC) is abstract;

interface type DEF is new ABC;

procedure B_Func (This : ABC) is abstract;

You could then have vars like:

A : ABC'Class := An_X object;

type ABC_Pointer is access all ABC'Class;

I would have a syntax for OO that was not embarassing to talk about in
public and would stop turning purple when confronted by OO people about MI
since I have at least interface inheritance _directly_ suported by the
language.

On Win32 I would implement the interfaces using the same "vtbl" style used
by MSVC++ and therefore COM.

Perhaps some day......

(Ok, enough day dreaming, I've got to get back to work...)

David Botton


Robert Dewar wrote in message <8dc8oi$kda$1@nnrp1.deja.com>...
>  class type x is record ....