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From: mark_lundquist@my-deja.com
Newsgroups: comp.lang.ada
Subject: Re: Subprogram types vs. "limited access" (was Re: Do we need
 "Mission-Critical" software? Was: What to Do?
Date: Tue, 16 Jan 2001 02:57:39 GMT
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Date: 2001-01-16T02:57:39+00:00
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In article <9404rc$en9$1@nnrp1.deja.com>,
  Robert Dewar <robert_dewar@my-deja.com> wrote:
> In article <93vonj$3td$1@nnrp1.deja.com>,
>   mark_lundquist@my-deja.com wrote:
> > Kind of, but not really :-).  Objects of T'Class really are
> _objects_,
> > even if you can't declare an object to be of type T'Class.
> Classwide
> > types are formally defined to be indefinite, as are
> unconstrained
> > types.  So you can't declare an object of type T'Class, for
> the same
> > reason that you cannot declare an object of type String.
>
> That seems a little misleading, you most certainly can declare
>
>   a : string := "hello";
>

A little misleading?  That's charitable of you! :-)

> and the nominal type of a is indeed string.

It sho nuff is.

One thing I like about Ada's type theory is how the dimension of
derivation and the dimension of constraints (subtyping) are
distinguished from each other, but fit together.


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