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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: How to access an array using two different indexing schemes
Date: Mon, 27 Nov 2017 19:39:34 -0600
Organization: JSA Research & Innovation
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"Robert A Duff" <bobduff@TheWorld.com> wrote in message 
news:wccy3mv1g3v.fsf@TheWorld.com...
...
> This is called "sliding".  So long as X'Length = Y'Length,
> the bounds can change in this way on assignment statements.

Ah, thanks Bob -- someone with the REAL answer to this question (but which 
has been completely ignored so far as I can see). All of the other answers 
(other than mine, of course ;-) are garbage - there isn't the least 
difficulty in "changing the bounds" of an array in Ada other than that you 
have to declare a name for each such set of bounds. Such a hardship... :-)

                                         Randy.