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From: Simon Wright <simon@pogner.demon.co.uk>
Subject: Re: Exposing agreggate members of a class
Date: 1999/01/03
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Date: 1999-01-03T00:00:00+00:00
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"David Botton" <dbotton@hotmail.com> writes:

> Given:
> 
> with GCanvas_Package; use GCanvas_Package;
> 
> type GWindow_Object is tagged with private;
> type GWindow_Pointer is access all GWindow_Object;
> 
> private:
> 
> type GWindow_Object is tagged
>    record
>         Canvas : GCanvas_Object;
>    end record;
> 
> What is the cleanest way to give access to the Canvas by reference in a way
> that will not require Unchecked Programming

You could use a generic:

  generic
    with procedure process (c : in out gcanvas_object);
  procedure access_canvas (g : gwindow_object);

(actually, I suspect that should be (g : in out gwindow_object))

NB, I'm not sure you actually mean 'by reference' here? see LRM 6.2(2)