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=-0.9 required=5.0 tests=BAYES_00,FORGED_GMAIL_RCVD,
	FREEMAIL_FROM autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: 103376,608011466ae2af71
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII-7-bit
Received: by 10.68.223.73 with SMTP id qs9mr468941pbc.7.1341261725496;
        Mon, 02 Jul 2012 13:42:05 -0700 (PDT)
Path: 
 l9ni10639pbj.0!nntp.google.com!news1.google.com!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
From: Anh Vo <anhvofrcaus@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: GNAT and Dimension Checking
Date: Mon, 2 Jul 2012 13:42:04 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: <d88ae03b-b657-40b9-a17f-c00b87d73dac@googlegroups.com>
References: <2afdc8e6-def0-4a00-8535-4db40165fc92@googlegroups.com>
 <jsoqgi$s4v$1@speranza.aioe.org>
 <3c38572a-c06c-4b58-9405-ece43483b3cd@googlegroups.com>
NNTP-Posting-Host: 149.32.224.33
Mime-Version: 1.0
X-Trace: posting.google.com 1341261725 21817 127.0.0.1 (2 Jul 2012 20:42:05
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 2 Jul 2012 20:42:05 +0000 (UTC)
Cc: nma@12000.org
In-Reply-To: <3c38572a-c06c-4b58-9405-ece43483b3cd@googlegroups.com>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com;
 posting-host=149.32.224.33;
 posting-account=Qh2kiQoAAADpCLlhT_KTYoGO8dU3n4I6
User-Agent: G2/1.0
Content-Type: text/plain; charset=ISO-8859-1
Date: 2012-07-02T13:42:04-07:00
List-Id: <comp.lang.ada>

On Sunday, July 1, 2012 3:44:19 AM UTC-7, (unknown) wrote:
> This feature is rather limited though. For example one cannot do conversions. If you have to work with an "irregular" unit, you will have to do the conversion yourself e.g.
> 
> with System.Dim.MKS; use System.Dim.Mks;
> with System.Dim.Mks_IO; use System.Dim.Mks_IO;
> with Text_IO; use Text_IO;
> 
> procedure Free_Fall3 is
>        subtype Acceleration is Mks_Type
>        with Dimension => ("m/s^2", Meter => 1, Second => -2, others => 0);
>        G : constant acceleration := 127137.6 * km/(hour ** 2) ;
>        T : Time := 10.0/3600.0 * hour;
>        Distance : length;
> 
>      begin
>        Put ("Gravitational constant: ");
>        Put (G, Aft => 2, Exp => 0); Put_Line ("");
>        Put ("Time: ");
>        Put (T, fore => 4, Aft => 4, Exp => 0); Put_Line ("");
>        Distance := 0.5 * G * T ** 2;
>        Put ("distance travelled in 10 seconds (or 10/3600 hour) of free fall ");
>        Put (Distance, fore => 4, Aft => 4, Exp => 0);
>        Put_Line ("");
> end Free_Fall3; 

I may be off track here. That is I thought I understood aspect syntax until I browsed to the definition of System.Dim.Mks.Mks_Type type.

  type Mks_Type is new Long_Long_Float
     with
      Dimension_System => (
        (Unit_Name => Meter,    Unit_Symbol => 'm',   Dim_Symbol => 'L'),
        (Unit_Name => Kilogram, Unit_Symbol => "kg",  Dim_Symbol => 'M'),
        (Unit_Name => Second,   Unit_Symbol => 's',   Dim_Symbol => 'T'),
        (Unit_Name => Ampere,   Unit_Symbol => 'A',   Dim_Symbol => 'I'),
        (Unit_Name => Kelvin,   Unit_Symbol => 'K',   Dim_Symbol => "Theta"),
        (Unit_Name => Mole,     Unit_Symbol => "mol", Dim_Symbol => 'N'),
        (Unit_Name => Candela,  Unit_Symbol => "cd",  Dim_Symbol => 'J'));

 Can anyone point me to the ARM 2012 paragraph(s) which supports this syntax in general. Thanks.

Anh Vo