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=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM
	autolearn=ham autolearn_force=no version=3.4.4
X-Google-Thread: 103376,6689542a60dbcc55
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,UTF8
Path: 
 g2news1.google.com!news3.google.com!feeder3.cambriumusenet.nl!feed.tweaknews.nl!138.195.8.3.MISMATCH!news.ecp.fr!aioe.org!not-for-mail
From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?=
 =?utf-8?Q?=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Discriminated records are not the most efficient, but ...
Date: Sun, 22 Aug 2010 22:40:08 +0200
Organization: Ada At Home
Message-ID: <op.vhuw06a1ule2fv@garhos>
References: <op.vhs349clule2fv@garhos> <op.vhs5xtdlule2fv@garhos>
 <op.vhtrcjhmule2fv@garhos>
NNTP-Posting-Host: qaSBlvV+1zCl6PWY+jYb4w.user.speranza.aioe.org
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
Content-Transfer-Encoding: Quoted-Printable
X-Complaints-To: abuse@aioe.org
X-Notice: Filtered by postfilter v. 0.8.2
User-Agent: Opera Mail/10.61 (Win32)
Xref: g2news1.google.com comp.lang.ada:13634
Date: 2010-08-22T22:40:08+02:00
List-Id: <comp.lang.ada>

Le Sun, 22 Aug 2010 07:39:45 +0200, Yannick Duch=C3=AAne (Hibou57)  =

<yannick_duchene@yahoo.fr> a =C3=A9crit:
> (here, the underscore =E2=80=9C_=E2=80=9D has the same meaning as with=
 Prolog)
This =E2=80=9C_=E2=80=9D is nice for analysis, as it explicitly state a =
given component of  =

a structure is not used in a given branch of a recursive algorithm (or  =

even not recursive). I feel this help to express clean analysis.

Funny: I came to an SML tutorial containing a whole paragraph talking  =

about Ada and how some SML constructs can be mapped to Ada. It said (the=
y  =

seemed to like Pascal and Algol also):

   Roughly speaking (that is their wording)
    * Structures in ML corresponds to Package in Ada
    * Signature corresponds to an Ada Package Interface
    * Functor corresponds to Generic Package in Ada

But they was wrong in one point, as they also ended with:

    =E2=80=9CHowever, ML admits structures (not just types) as parameter=
s to  =

functors.=E2=80=9D

Probably they never heard about =E2=80=9Cpackage formal parameter=E2=80=9D=
. I suppose they  =

knew about Ada 83 and this was not there with this one (but was this  =

really the case ?)

They also forget about discriminated records (but they did not claim the=
ir  =

match/match list was exhaustive).