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=2.0 required=5.0 tests=BAYES_00,FORGED_MUA_MOZILLA,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,33c05cfcb26839d1,start
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.68.193.129 with SMTP id ho1mr22168885pbc.8.1340184561673;
        Wed, 20 Jun 2012 02:29:21 -0700 (PDT)
Path: 
 l9ni71880pbj.0!nntp.google.com!news2.google.com!goblin1!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail
From: "Nasser M. Abbasi" <nma@12000.org>
Newsgroups: comp.lang.ada
Subject: nice features in Ada 2012, expressions
Date: Wed, 20 Jun 2012 04:29:16 -0500
Organization: Aioe.org NNTP Server
Message-ID: <jrs55d$oj0$1@speranza.aioe.org>
Reply-To: nma@12000.org
NNTP-Posting-Host: KdJUrTuvv3Zv/s8pPxNluw.user.speranza.aioe.org
Mime-Version: 1.0
X-Complaints-To: abuse@aioe.org
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
 rv:13.0) Gecko/20120614 Thunderbird/13.0.1
X-Notice: Filtered by postfilter v. 0.8.2
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Date: 2012-06-20T04:29:16-05:00
List-Id: <comp.lang.ada>

I was looking at Ada 2012 expressions

http://www.adacore.com/uploads/technical-papers/Ada2012_Rationale_Chp2_expressions.pdf

and I really like what I see. Ada is becoming more expressive now,
with less code, which I think is a good thing(TM).

It is getting almost as short as Matlab now (but with the strong
type build-in)

Given a matrix A, and I want to find if all elements in
the matrix are say positive, then in Matlab I would write

--------------------
B = all(A(:)>0)

In ada 2012 it is

B := (for all e of A => e>0);
--------------------

and if I want to find if there is at least one
value > 0 then in Matlab I would write

----------------------
B = any(A(:)>0)

and in Ada 2012

B := (for some e of A => e>0);
-----------------------

I think this is nice.

I am not sure yet, since I do not know much about Ada 2012,
if I can use this new iterator form if A was a standard array
variable, or if it will work only if A was a 'container' variable?

i.e. if A above was just variable of type like

        'A_type is array(integer) of float'

I hope it will work on standard arrays and not just on
collections so I can use it this form more.

I think these are the type of improvements needed in Ada to
make it more popular and more used. Real practical and
useful things.

I am looking forward for the 2012 gnat to try it out.

--Nasser