From: Markus E Leypold <development-2006-8ecbb5cc8aREMOVETHIS@ANDTHATm-e-leypold.de>
Subject: Re: Generic Package
Date: Fri, 27 Apr 2007 13:43:58 +0200
Date: 2007-04-27T13:43:58+02:00 [thread overview]
Message-ID: <9eejm6rqip.fsf@hod.lan.m-e-leypold.de> (raw)
In-Reply-To: degsdvcu9wwi$.1j7dffe23bgq5$.dlg@40tude.net
"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
> On Thu, 26 Apr 2007 22:52:58 +0100, Simon Wright wrote:
>
>> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>>
>>> You cannot iterate a relational table, because there is no order
>>> defined on it.
>>
>> Why would that stop me iterating over all the rows?
>
> Because iterating presumes following an order. If there is no *any* order,
> which one would you follow?
None. Iteration gives the values in a certain sequence, any time you
iterate. But it doesn't follow an order in the case of unordered
collections. Next time you iterate the elements might come in another
sequence.
> It is clear that we could enumerate anything on
> a real computer, but that would be same as Unchecked_Conversion, it would
> break the abstraction.
So I'm having an unchecked operation if I enumerate elements of a set
(sets are unordered). How embarrasing. Theat would mean, that there is
no efficient way to get at the elements of a given subset of the
natural numbers. I'd have to
for I in 0 ... infinity: if (I in M) then ... else ...
> I guess, one should first create a "result set", then enumerate it
> according to some order relation. That thing could be iterated
> through.
What nonsense.
Regards -- Markus
next prev parent reply other threads:[~2007-04-27 11:43 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-25 22:15 Generic Package andrew.carroll
2007-04-26 0:07 ` Jeffrey R. Carter
2007-04-26 7:46 ` Markus E Leypold
2007-04-26 6:02 ` Martin Krischik
2007-04-26 7:57 ` Dmitry A. Kazakov
2007-04-26 15:31 ` andrew.carroll
2007-04-26 16:07 ` Georg Bauhaus
2007-04-26 19:40 ` andrew.carroll
2007-04-26 20:01 ` Georg Bauhaus
2007-04-26 18:54 ` Dmitry A. Kazakov
2007-04-26 21:52 ` Simon Wright
2007-04-27 9:00 ` Dmitry A. Kazakov
2007-04-27 11:11 ` Georg Bauhaus
2007-04-27 12:06 ` Dmitry A. Kazakov
2007-04-27 12:52 ` Markus E Leypold
2007-04-27 14:10 ` Georg Bauhaus
2007-04-27 14:16 ` Dmitry A. Kazakov
2007-04-27 21:44 ` Georg Bauhaus
2007-04-28 7:38 ` Dmitry A. Kazakov
2007-04-28 17:50 ` Simon Wright
2007-04-28 21:04 ` Ray Blaak
2007-04-29 16:33 ` Markus E Leypold
2007-04-27 19:44 ` Simon Wright
2007-04-27 20:34 ` Dmitry A. Kazakov
2007-04-27 21:16 ` Simon Wright
2007-04-28 7:36 ` Dmitry A. Kazakov
2007-04-27 11:43 ` Markus E Leypold [this message]
2007-04-28 17:35 ` Dmitry A. Kazakov
2007-04-28 23:06 ` Georg Bauhaus
2007-04-29 8:19 ` Dmitry A. Kazakov
2007-04-29 15:10 ` (see below)
2007-04-29 17:48 ` Dmitry A. Kazakov
2007-04-29 22:36 ` (see below)
2007-04-30 6:58 ` Dmitry A. Kazakov
2007-04-30 9:59 ` Markus E Leypold
2007-04-30 10:01 ` Markus E Leypold
2007-04-30 10:36 ` Georg Bauhaus
2007-04-30 10:40 ` Georg Bauhaus
2007-04-30 12:14 ` Dmitry A. Kazakov
2007-04-30 14:57 ` (see below)
2007-04-30 10:30 ` Georg Bauhaus
2007-04-30 12:16 ` Dmitry A. Kazakov
2007-04-30 14:48 ` Georg Bauhaus
2007-04-30 16:29 ` Dmitry A. Kazakov
2007-04-30 17:24 ` Georg Bauhaus
2007-04-30 18:54 ` Dmitry A. Kazakov
2007-04-30 19:29 ` Simon Wright
2007-04-30 20:04 ` Dmitry A. Kazakov
2007-05-01 0:11 ` Markus E Leypold
2007-05-01 9:02 ` Georg Bauhaus
2007-05-01 10:19 ` Dmitry A. Kazakov
2007-05-01 13:42 ` Georg Bauhaus
2007-05-01 17:16 ` Dmitry A. Kazakov
2007-05-01 19:14 ` Randy Brukardt
2007-05-01 20:14 ` Dmitry A. Kazakov
2007-05-02 7:52 ` Markus E Leypold
2007-05-02 8:06 ` Markus E Leypold
2007-05-03 0:37 ` Randy Brukardt
2007-05-03 8:36 ` Markus E Leypold
2007-05-03 23:16 ` Randy Brukardt
2007-05-04 0:15 ` Markus E Leypold
2007-05-01 21:41 ` Georg Bauhaus
2007-05-02 6:57 ` Ray Blaak
2007-05-02 8:22 ` Markus E Leypold
2007-05-02 8:07 ` Markus E Leypold
2007-05-02 10:29 ` Dmitry A. Kazakov
2007-05-02 11:48 ` Georg Bauhaus
2007-05-02 11:50 ` Georg Bauhaus
2007-05-02 13:12 ` Dmitry A. Kazakov
2007-05-02 14:21 ` Markus E Leypold
2007-05-03 18:27 ` Georg Bauhaus
2007-05-03 19:07 ` Dmitry A. Kazakov
2007-05-03 19:49 ` Markus E Leypold
2007-04-29 16:26 ` Markus E Leypold
2007-04-26 21:50 ` Simon Wright
2007-04-27 4:45 ` Jeffrey R. Carter
2007-04-27 7:45 ` Martin Krischik
2007-04-27 22:54 ` Georg Bauhaus
2007-04-30 20:13 ` Matthew Heaney
2007-04-26 20:48 ` andrew.carroll
-- strict thread matches above, loose matches on Subject: below --
2003-12-02 23:15 Mr. J.
2003-12-03 9:31 ` Dmitry A. Kazakov
2003-12-02 23:13 generic package Ratson Janiv
2003-12-03 17:39 ` Stephen Leake
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