From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Subject: Re: Is T an ancestor of T?
Date: Wed, 20 Oct 2004 14:02:52 +0000 (UTC)
Date: 2004-10-20T14:02:52+00:00 [thread overview]
Message-ID: <cl5r6c$632$1@a1-hrz.uni-duisburg.de> (raw)
In-Reply-To: mailman.35.1098264739.10401.comp.lang.ada@ada-france.org
Christoph Karl Walter Grein <AdaMagica@web.de> wrote:
: From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
:
:> I still don't know whether or not a type is an ancestor of itself,
:> given that it is a descendant of itself.
:
: Looking into RM Index for ancestor, you'll find the reference to RM 3.4.1(10) with the definition of ancestor and descendant:
Yes, descendant seem clearly defined in this paragraph. However,
"The ultimate ancestor of a type is the
ancestor of the type that is not a descendant of any other type."
(In the original example, there was a new tagged private type T
and an aggregate T'(T with n => ) which is o.K. by GNAT, not o.K.
by Object Ada. When T is derive via new from some tagged T0,
both compilers agree again.)
What is "any other type"? Likely it means any type other than the
descendant (which can be a descendant of itself according to the
first sentence of 3.4.1(10))? So by the descendant wording,
T0 ==> {T0, T1, T1', T2, ...}.
Which of T0, ... is not a descendant of any other type?
And is an ultimate ancestor listed in the line above when ancestor
is "the reverse" of descendant?
That is too tricky for me :-)
-- Georg
next prev parent reply other threads:[~2004-10-20 14:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-18 5:55 Is T an ancestor of T? Christoph Karl Walter Grein
2004-10-20 14:02 ` Georg Bauhaus [this message]
2004-10-20 16:18 ` Björn Persson
2004-10-20 21:41 ` Georg Bauhaus
2004-10-20 23:33 ` Björn Persson
2004-10-22 2:27 ` Georg Bauhaus
2004-10-23 16:55 ` Björn Persson
2004-10-26 0:37 ` Randy Brukardt
-- strict thread matches above, loose matches on Subject: below --
2004-10-12 1:31 record extension aggregate for returned type legal? Georg Bauhaus
2004-10-12 8:04 ` Martin Krischik
2004-10-12 14:36 ` Georg Bauhaus
[not found] ` <1940150.rU8f1KaX3L@linux1.krischik.com>
2004-10-12 20:24 ` Georg Bauhaus
2004-10-13 7:52 ` Martin Krischik
[not found] ` <ckjlhm$2hh$1@a1-hrz.uni-duisburg.de>
[not found] ` <ukhbd.106086$dP1.396181@newsc.telia.net>
2004-10-14 0:29 ` Is T an ancestor of T? Georg Bauhaus
2004-10-14 8:54 ` Is T an ancestor of T? (was: Re: record extension aggregate for returned type legal?) Martin Krischik
[not found] ` <ckot3m$hek$1@a1-hrz.uni-duisburg.de>
2004-10-15 16:55 ` Is T an ancestor of T? Martin Krischik
2004-10-15 17:19 ` Georg Bauhaus
2004-10-16 14:37 ` Martin Krischik
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