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From: "Vladimir Olensky" <vladimir_olensky@yahoo.com>
Subject: Re: Objects properties -  Ada design issues question
Date: 2000/02/04
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Date: 2000-02-04T00:00:00+00:00
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Vladimir Olensky wrote in message ...
>Objects properties -  Ada design issues question:


Noticed that my example was a little bit incorrect so
below is  a small correcton:

It was:
>
>package P is
>
>  type T is tagged private;
>
>   type T1 is  new T with record
>        --  public properties A and B;
>        --  they are public views of some internal  states
>        --  which in turn could be fields of some complex
>        --  "Black Box" internal  structures;
>        A : [property]  constant Integer;
>        B : [property]  Integer;
>   end record;
> private
<   ...>
> end P;


Should be:

package P is
   type T is abstract tagged record
        --  public properties A and B;
        --  they are public views of some internal  states
        --  which in turn could be fields of some complex
        --  "Black Box" internal  structures;
        A : [property]  constant Integer;
        B : [property]  Integer;
   end record;

  type T1 is new T with   private;

 private
    <   ...>
    for  T1.A'Get ...
    for  T1.B'Get ..
    for  T1.B'Set ..

 end P;

Sorry for not having checked it prior to sending.

Regards,
Vladimie Olensly