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From: Jerrid Kimball <jerrid@kimball.co>
Newsgroups: comp.lang.ada
Subject: Re: Can Ada iterate over Nd array?
Date: Thu, 26 Apr 2012 20:58:49 -0500
Organization: Jacob Sparre Andersen Research & Innovation
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Date: 2012-04-26T20:58:49-05:00
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bOn 04/26/2012 07:36 PM, Randy Brukardt wrote:
> "Dmitry A. Kazakov"<mailbox@dmitry-kazakov.de>  wrote in message
> news:18y0zty0yw1m3.1dkfnp5etqdk0$.dlg@40tude.net...
>> On Thu, 26 Apr 2012 06:02:13 +0000 (UTC), Okasu wrote:
>>
>>> So you trying to say that i have to write loops for 10/100/1000d arrays
>>> by hand?
>>
>> You should introduce an index type of your own (a Nth tuple) and use a
>> flat
>> container, e.g. a map over that index.
>>
>> Unfortunately Ada does not have 1st class indices, which was #10 in my
>> wish
>> list for Ada 202X.
>
> It does, however, have 2nd class indices (see 4.1.6), which work better than
> first class indicies most of the time.
>
> Also, you can iterate over the entire array without using any indicies in
> Ada 2012:
>
>     for E of A loop
>        null;
>     end loop;
>
> This also works for containers.
>
> But this doesn't work in earlier versions of Ada.
>
>                                          Randy.
>
>

And in a recent GNAT wavefront, it seems to only work for 
one-dimensional arrays.  Otherwise, you get an error "too few subscripts 
in array reference" which doesn't make a lot of sense.  This is 7.1w 
from January, but supposedly 7.0 has full 2012 support.  I've noticed a 
lot of problems in this wavefront regarding 2012 support so hopefully 
they're not issues in 7.0 stable.