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Subject: Re: Full view of a private partial view cannot be a subtype
From: Robert Eachus <rieachus@comcast.net>
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Xref: reader02.eternal-september.org comp.lang.ada:49333
Date: 2017-12-03T09:44:56-08:00
List-Id: <comp.lang.ada>

On Sunday, December 3, 2017 at 9:34:51 AM UTC-5, Jeffrey R. Carter wrote:
=20
> Many people seem to think that as much as possible should be done through=
 type=20
> extension. They act as though the only tool they have is the hammer of ty=
pe=20
> extension, and so view every problem as a nail. In my experience type ext=
ension=20
> is usually best avoided whenever possible.

Several decades ago, there was a fun paper: "Nesting in Ada is for the bird=
s." by Lori Clarke et. al. https://dl.acm.org/citation.cfm?id=3D948651  It =
may be time for a similar article about type extension.  But it can't have =
quite so catchy a title.  Building a type using mix-ins works nicely, but y=
ou want all the actual objects in the program to be of the (many) great gra=
ndchild type.  I'll have to do more thinking about it.