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From: Matthew Heaney <matthewjheaney@earthlink.net>
Newsgroups: comp.lang.ada
Subject: Re: OO Style with Ada Containers
Date: Mon, 26 Nov 2007 04:07:08 +0000
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Date: 2007-11-26T04:07:08+00:00
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Pascal Obry <pascal@obry.net> writes:

> Yes. Scanner has a privately defined discriminant. So the public view of
> Scanner must be declared unconstrained.

Right, but that's not the reason I did it.  This is the "limited and
indefinite" idiom, to force the object to be initialized explicitly, using one
of the primitive operations defined for the type.


> It is for gaining write access to function in parameter. A simpler
> solution is:

I prefer Jean-Pierre's canonical technique (see the CLA archives from the fall
of '99 when the term "Rosen Trick" was coined), but your mileage might vary.