From: AdaMagica <christ-usch.grein@t-online.de>
Subject: Re: Problem with Position of the enumeration Type
Date: Thu, 24 Jan 2019 00:06:49 -0800 (PST)
Date: 2019-01-24T00:06:49-08:00 [thread overview]
Message-ID: <959429b8-2817-4339-bd01-01153a7a544c@googlegroups.com> (raw)
In-Reply-To: <217206e7-81aa-4aa8-8d19-66498c36100d@googlegroups.com>
Am Mittwoch, 23. Januar 2019 13:08:34 UTC+1 schrieb Luis Ladron de Guevara Moreno:
> El miércoles, 23 de enero de 2019, 11:33:36 (UTC+1), AdaMagica escribió:
> > See RM 13.4(11/3)ff:
> > NOTES
> > 14 Unchecked_Conversion may be used to query the internal codes used for
> > an enumeration type. The attributes of the type, such as Succ, Pred, and Pos, are unaffected by the enumeration_representation_clauserepresentation_clause.
> >
> > Some questions on your code:
> >
> > Position : Integer; -- Why is this Integer and not Natural?
> >
> > for I in E_Test'Base loop -- Why do you use 'Base here?
>
> I wrote a Integer as an example, i could add Natural also, for this example there are not difference.
It does make a difference. Ada has subtypes just for this purpose: If you know that the values of an object of some type belong only to some subtype, you indicate this in the declaration.
This is the very idea of stong typing.
> I'm using 'Range to go through all the positions in enumeration.
No, you used 'Base.
For a enum type E, these are always the same:
for V in E loop
for V in E'Range loop
For an enum type that is not derived, E'Base is the same as E. For types derived from E, there might be a difference.
> I tried to use Ada.Unchecked_Conversion and i got obtain the values for the position. but as you told me, if i use 'post (), the number of the list start in 0.
Yes, this is what the RM prescribes.
next prev parent reply other threads:[~2019-01-24 8:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-23 10:05 Problem with Position of the enumeration Type Luis Ladron de Guevara Moreno
2019-01-23 10:33 ` AdaMagica
2019-01-23 10:55 ` AdaMagica
2019-01-23 12:08 ` Luis Ladron de Guevara Moreno
2019-01-23 12:15 ` Karl Müller
2019-01-23 21:50 ` Niklas Holsti
2019-01-24 8:06 ` AdaMagica [this message]
2019-01-23 11:32 ` Mark Lorenzen
2019-01-23 12:30 ` Luis Ladron de Guevara Moreno
2019-01-23 20:22 ` Shark8
2019-01-24 8:13 ` AdaMagica
2019-01-23 17:06 ` Simon Wright
2019-01-23 22:54 ` Randy Brukardt
2019-01-23 23:47 ` Keith Thompson
2019-01-24 4:34 ` Keith Thompson
2019-01-24 9:11 ` Simon Wright
2019-01-24 21:41 ` Randy Brukardt
2019-01-23 21:42 ` Niklas Holsti
2019-01-23 22:35 ` Simon Wright
2019-01-23 23:20 ` Niklas Holsti
2019-01-24 16:43 ` Jeffrey R. Carter
2019-01-24 19:39 ` Niklas Holsti
2019-01-24 20:29 ` Jeffrey R. Carter
2019-01-24 21:43 ` Randy Brukardt
2019-01-26 9:44 ` G.B.
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