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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Behavior of Stream Attributes On Access Types.
Date: 14 Jun 2002 19:27:39 +0100
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Date: 2002-06-14T19:27:39+01:00
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"Marin David Condic" <dont.bother.mcondic.auntie.spam@[acm.org> writes:

> package Level_1 is
>     type L1 is tagged record
>         A : Integer ;
>     end record ;
>     --
>     --  Here I have L1'Read, L1'Write, L1'Input, L1'Output
>     --  and L1'Class'Read L1'Class'Write L1'Class'Input L1'Class'Output
>     --
> end Level_1 ;
> 
> package Level_1.Level_2 is
>     type L2 is new Level_1.L1 with record
>         B : Some_Access_Type := null ;
>     end record ;
>     --
>     --  Now I have to define my own 'Read and 'Write

I think this is where the mistake occurs.

At the point where you declared Some_Access_Type, declare

  procedure My_Read
    (Stream : access Ada.Streams.Root_Stream_Type'Class;
     Obj : Some_Access_Type);
  for Some_Access_Type'Read use My_Read;

and also for My_Write, and all magically happens ..