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From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Weird behavior with modular type
Date: Tue, 07 Feb 2012 19:15:52 +0100
Organization: Ada @ Home
Message-ID: <op.v9bmcqprule2fv@douda-yannick>
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Date: 2012-02-07T19:15:52+01:00
List-Id: <comp.lang.ada>

Le Tue, 07 Feb 2012 18:49:14 +0100, Jeffrey Carter  =

<spam.jrcarter.not@spam.not.acm.org> a =C3=A9crit:

> On 02/07/2012 10:24 AM, Yannick Duch=C3=AAne (Hibou57) wrote:
>  >
>> Seems in the first case, the left=E2=80=91side of =E2=80=9CE < 10 ** =
I=E2=80=9D has a modulo  =

>> applied, or
>> else, I see no way to explain the result, "FALSE". But why would this=
  =

>> modulo be
>> applied with a subtype of Natural and not with an Universal_Integer?
>
> Seems to me in both cases the expression on the right of "<" is  =

> Universal_Integer. What compiler message did you get?

Message is as follow:

    bug.adb:12:23: value not in range of type "Modular_Type" defined at =
 =

line 4
    bug.adb:12:23: static expression fails Constraint_Check

Compiled with GNAT.

Line 12 is the one containing =E2=80=9CB :=3D E < Natural'Pos (10 ** I);=
=E2=80=9D.

By the way, formally speaking, the expression is not static, and it shou=
ld  =

compile, although expected to raise a range=E2=80=91check=E2=80=91error =
at runtime.

-- =

=E2=80=9CSyntactic sugar causes cancer of the semi-colons.=E2=80=9D [1]
=E2=80=9CStructured Programming supports the law of the excluded muddle.=
=E2=80=9D [1]
[1]: Epigrams on Programming =E2=80=94 Alan J. =E2=80=94 P. Yale Univers=
ity