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From: kilgallen@eisner.decus.org (Larry Kilgallen)
Subject: Re: Invoking parental methods (was: Java vs Ada 95)
Date: 1996/11/06
Message-ID: <1996Nov6.123559.1@eisner>#1/1
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references: <E0ED6w.24D.0.-s@inmet.camb.inmet.com>
 <E0EIM2.A3p.0.-s@inmet.camb.inmet.com> <1996Nov5.112527.1@eisner>
 <E0GI86.BH6@world.std.com>
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organization: LJK Software
newsgroups: comp.lang.ada
Date: 1996-11-06T00:00:00+00:00
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In article <E0GI86.BH6@world.std.com>, bobduff@world.std.com (Robert A Duff) writes:
> In article <1996Nov5.112527.1@eisner>,
> Larry Kilgallen <kilgallen@eisner.decus.org> wrote:
>>My problem, again, is maintainability in the face of genealogy shifts.
>>Since Ada 95 does not have a mechanism to do it with zero changes
>>to the body in the fashion of Macintosh Object Pascal, I am hoping
>>for 1.
> 
> Use a convention where you always write:
> 
>     subtype Parent is Whatever;
>     type New_Type is new Parent ...;
> 
> Always use the name Parent in your type conversions (as in
> "Parent(Param.all)'Access").  Then you can change the parent by changing
> one line to "subtype Parent is Something_Else;".  No changes to the body
> are needed.

Thanks!

I had not even dared hope to be able to do it in the specification !