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Subject: Re: class wide iterable (and indexable)
From: George Shapovalov <gshapovalov@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:55211
Date: 2019-01-06T01:34:08-08:00
List-Id: <comp.lang.ada>

> > You can using a Mixin Generic along with the interface.  Consider the
> > following example:
> >   <SNIPPED>
>=20
> And if you don't like the Mixin method, you can do something a bit closer=
 to
> composition and Rust's model=20
Thank you!
Yes, this does the job done (and I believe the 1st one was what Dmitry alre=
ady have shown above), achieving the effect of in-mixing overridable method=
s. However allowing interfaces to have non0bull or abstract primitives (obv=
iously referencing onyl existing entities, just like class-wide methods do =
already anyway) would have been much less cumbersome and much more elegant =
and readable to begin with..

But this was just a sidenote to that discussion. My original intention was =
to attempt to move the existing type (that would serve as a top of type hie=
rarchy normally) to the side of a new type tree - which is not that "topolo=
gically different" from the mix-in equiliristic, just a bit different way t=
o glue things together. The complicating circumstance in that specific case=
 (which prompted my original post) was to provide indexing/iteration to the=
 entire type tree and then glue Ada.Containers.Vectors right over it, which=
 finally succeeded after more digging through aspects and Ada standard libr=
ary internals.

Tanks to everybody for informative comments!