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From: ytomino <aghia05@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: discriminant questions
Date: Tue, 20 Sep 2011 11:47:50 -0700 (PDT)
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Date: 2011-09-20T11:47:50-07:00
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> Note that generics poison anything they touch. Every language feature need
> a generic counterpart, so not only the discriminants need to have
> corresponding formal generic parameter, but also the newly added aspect
> stuff. I don't know if Ada 2012 has formal generic implicit_dereference.
> Does it?
Yes, formal type can have  [aspect_specification].
http://www.ada-auth.org/standards/12rm/html/RM-12-5.html

And it's related only to syntax. If formal type can not have aspect,
we can write ".Element.all" like Georg Bauhaus wrote.

> Anyway the first step to do is generic package interfaces. If you want
> Vectors, Doubly_Linked_Lists etc to be used in a generic manner they shall
> implement an interface (a generic one, because the packages are generic).
> Ada lacks means to describe generic interfaces and to match generic
> packages against them.
> The whole idea of generic containers used for generic programming is not
> sustainable, sorry for delivering an inconvenient truth.
> If you want generic programming working do it on the class-wide basis.

There is an illogical jump in what you say.
The problem is just that Reference/Constant_Reference can be used in
generic, or not.
And it's tiny problem. If Reference/Constant_Reference can not be used
in generic after all, I will use Element or Query_Element as before.