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From: christoph.grein@eurocopter.com
Newsgroups: comp.lang.ada
Subject: Re: (Num_Types.Mod_4 range 1..8) ------->why not (1..8)?
Date: Tue, 19 May 2009 01:04:47 -0700 (PDT)
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Date: 2009-05-19T01:04:47-07:00
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On May 19, 9:47=A0am, Petter <petter_frykl...@hotmail.com> wrote:
> For scalar types Checked_Conversion is a good idea:
>
> generic
> =A0 =A0type Source is (<>);
> =A0 =A0type Target is (<>);
>
> function Checked_Conversion (S : Source) return Target;
>
> with Ada.Unchecked_Conversion;
> function Checked_Conversion (S : Source) return Target is
> =A0 =A0function "+" is new Ada.Unchecked_Conversion (Source =3D> Source,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0Target =3D> Target);

Be careful, a lot can get wrong if the sizes of Source and Target are
different. The 'Valid attribute is not enough.