From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=0.4 required=5.0 tests=BAYES_00,FORGED_MUA_MOZILLA
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,35edde140291c79e
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.68.236.170 with SMTP id uv10mr7475746pbc.4.1335486540709;
        Thu, 26 Apr 2012 17:29:00 -0700 (PDT)
Path: 
 r9ni102445pbh.0!nntp.google.com!news1.google.com!volia.net!news2.volia.net!feed-A.news.volia.net!news.musoftware.de!wum.musoftware.de!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!eternal-september.org!feeder.eternal-september.org!mx04.eternal-september.org!.POSTED!not-for-mail
From: BrianG <me@null.email>
Newsgroups: comp.lang.ada
Subject: Re: Can Ada iterate over Nd array?
Date: Thu, 26 Apr 2012 20:28:58 -0400
Organization: A noiseless patient Spider
Message-ID: <jncp8b$99e$1@dont-email.me>
References: <slrnjphkhm.h4f.oka.sux@localhost.localdomain>
 <26754113.2767.1335431755764.JavaMail.geo-discussion-forums@vbki8>
 <jnc33p$4nk$1@tornado.tornevall.net>
Mime-Version: 1.0
Injection-Date: Fri, 27 Apr 2012 00:29:00 +0000 (UTC)
Injection-Info: mx04.eternal-september.org;
 posting-host="5MNoRlpIAhOS/jy0qxZerw";
	logging-data="9518"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1/p/LXqeH6mVOr4CZpwrpw9"
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US;
 rv:1.9.2.24) Gecko/20111108 Thunderbird/3.1.16
In-Reply-To: <jnc33p$4nk$1@tornado.tornevall.net>
Cancel-Lock: sha1:hFKGVGMSfB5p7OE6vOM5vVyg/zI=
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Date: 2012-04-26T20:28:58-04:00
List-Id: <comp.lang.ada>

On 04/26/2012 02:09 PM, Jeffrey Carter wrote:
> On 04/26/2012 02:15 AM, gautier.de.montmollin@gmail.com wrote:
>>
>> We could make a poll here: which is the maximum number of array
>> dimensions you ever used ?
>> My answer: probably 5 or 6.
>
> I don't recall ever using more than 3.
>
> I don't think arrays with more than about 30 dimensions are going to be
> possible with current technology: given only 2 index values/dimension,
> that's 2 ** 30 components, or 1 GB if each component is a byte. Much
> more than that and you won't be able to allocate the array. Even in the
> foreseeable future it doesn't look as if a 100-dimension array will be
> possible. 1000 dimensions is right out!
>
If what is desired is an "n-dimensional array" (i.e. n is a parameter of 
some sort - generic or procedure parameter), what are you going to do 
with it, even if you can iterate?  How do you declare such a type?  If 
it's to be used as a library to work on "n-dimensional arrays", how do 
you specify subroutine parameters?  (Except as a raw memory address or 
equivalent.)

-- 
---
BrianG
000
@[Google's email domain]
.com