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Newsgroups: comp.lang.ada
Date: Tue, 13 Feb 2018 00:00:38 -0800 (PST)
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Subject: Re: troubles learning OOP: expected type "Parent.Some_Child", found
 type Parent'Class
From: Stephen Leake <stephen_leake@stephe-leake.org>
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Xref: reader02.eternal-september.org comp.lang.ada:50410
Date: 2018-02-13T00:00:38-08:00
List-Id: <comp.lang.ada>

On Monday, February 12, 2018 at 3:18:38 PM UTC-6, Mehdi Saada wrote:
> the components are all enumeration types of one character, except for T_TOKEN_OPERANDE.OPERANDE who's an INTEGER.
> Ahhh... The trick is to encapsulate the components of different types into tagged types, so that they can be grouped together into a class, and so GET_ELEM can be dispatched. That's awfully artifical. Unfortunately, I must keep with the current design,
> with things like
> type T_TOKEN is abstract tagged null record;
> type T_TOKEN_OPERANDE is new T_TOKEN with record
>     OPERANDE: INTEGER;
> end record;

In addition, as Simon pointed out, Get_Elem must be a "primitive operation" of T_Token, and overridden for T_Token_Operande, so it will dispatch on a class-wide object.