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From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Pascal Calling Convention
Date: Wed, 30 Mar 2011 07:47:50 -0700 (PDT)
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Date: 2011-03-30T07:47:50-07:00
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On Mar 30, 5:50=A0am, Robert A Duff <bobd...@shell01.TheWorld.com>
wrote:
> Adam Beneschan <a...@irvine.com> writes:
> > If that feature were added, I'd want the language to specify that the
> > value of the attribute must be a valid value for the subtype.
>
> Yes.
>
> >...(Maybe
> > that's what you meant and didn't say so explicitly?) =A0That would stil=
l
> > be a no-op if every bit pattern would be a valid value, which would be
> > the case for Integer (or for the first subtype of a "mod 2**32" or
> > "mod 2**64" type on most machines, which I think would be needed to
> > make Hyman's example work).
>
> Perhaps the feature would only be allowed on such (sub)types.

Well, if this feature actually *were* added (ha), it should probably
be allowed on any discrete subtype.  Using it on a subrange wouldn't
gain you much:

   subtype T is Integer range 1 .. 100;
   type T_Array is array (natural range <>) of T;
   X : T_Array (1..100) :=3D (others =3D> T'Arbitrary_Value);

A compiler would most likely just generate the same code as (others =3D>
T'First).  But it still would be useful to have this available in case
T is a generic formal type.

                           -- Adam