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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Enumeration representation
Date: Fri, 2 Jan 2004 14:52:03 -0600
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References: 
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Date: 2004-01-02T14:52:03-06:00
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message
news:wcchdzf6p9b.fsf@shell01.TheWorld.com...
> "Luke A. Guest" <laguest@n_o_p_o_r_k_a_n_d_h_a_m.abyss2.demon.co.uk>
writes:
>
> > Am I correct in saying that enumerations don't necessarily begin at
zero?
> > Is this implementation dependent?
>
> RM-13.4(8) *requires* the internal codes to be 0, 1, 2...
> if no representation clause is given.
> So there's never a need to say "for Enum_Type use (0, 1, 2, 3);" --
> that's the default.  It is not implementation dependent.

Note that that is only true of Ada 95; Ada 83 didn't specify anything. So,
if you care and you have to be compatible with Ada 83, you do need to give
the rep. clause. (But that combination ought to be very rare.)

                 Randy.