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Newsgroups: comp.lang.ada
Subject: Re: Generic Package
From: Georg Bauhaus <bauhaus@futureapps.de>
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Date: Fri, 27 Apr 2007 13:11:30 +0200
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Date: 2007-04-27T13:05:52+02:00
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On Fri, 2007-04-27 at 11:00 +0200, Dmitry A. Kazakov wrote:
> 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.

Any real table in an existing computer has a "natural"
ordering suitable for iterating an operation for all
elements: data in a real computer can be uniquely identified.
The fact that the ordering is hidden behind the functional
Iterate abstraction doesn't make it go away for any
snapshot of rows. It's a don't care.