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 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,499373c5a06cccc1
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2004-02-16 08:59:50 PST
Path: archiver1.google.com!postnews1.google.com!not-for-mail
From: ganesh.ramasivan@gdcanada.com (Ganesh Ramasivan)
Newsgroups: comp.lang.ada
Subject: Re: Variant records..
Date: 16 Feb 2004 08:59:50 -0800
Organization: http://groups.google.com
Message-ID: <e8f9995c.0402160859.31ea9a85@posting.google.com>
References: <e8f9995c.0402151451.5bbe03de@posting.google.com>
 <slrnc318ga.3ja.randhol+valid_for_reply_from_news@k-083152.nt.ntnu.no>
NNTP-Posting-Host: 209.47.1.92
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: posting.google.com 1076950790 1072 127.0.0.1 (16 Feb 2004 16:59:50
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 16 Feb 2004 16:59:50 +0000 (UTC)
Xref: archiver1.google.com comp.lang.ada:5605
Date: 2004-02-16T08:59:50-08:00
List-Id: <comp.lang.ada>

Preben Randhol <randhol+valid_for_reply_from_news@pvv.org> wrote in message news:<slrnc318ga.3ja.randhol+valid_for_reply_from_news@k-083152.nt.ntnu.no>...
> On 2004-02-15, Ganesh Ramasivan <ganesh.ramasivan@gdcanada.com> wrote:
> > In the following example, how would i forbid the user of data type Foo
> > from specifying the following:
> >
> > John : Foo(Vehicle => MAN, Power => AUTOMATIC);
> >
> > ie. is there a way to restrict the user from specifying certain types
> > as variants?
> 
> I guess this is homework? If it is why don't you simply try to do this
> and see what happens?

Okay.. I should probably have been a bit more realistic.. I am new to
ada but this is no homework assignment.

type RADAR_TYPE_CHOICE is (RADAR_A, RADAR_B, RADAR_C);
    
type RADAR_A_COMMAND_CHOICE is (RADAR_A_STATE,
                                RADAR_A_MODE,
                                RADAR_A_DISPLAY_RANGE_SELECT);
                                      
type RADAR_B_COMMAND_CHOICE is (RADAR_B_STATE,
                                RADAR_B_MODE,
                                RADAR_B_DISPLAY_RANGE_SELECT);

type RADAR_C_COMMAND_CHOICE is (RADAR_C_STATE,
                                RADAR_C_MODE,
                                RADAR_C_DISPLAY_RANGE_SELECT);

type RADAR_CHOICE(RADAR_TYPE : RADAR_TYPE_CHOICE :=
RADAR_TYPE_CHOICE'FIRST) is
      record   
        case RADAR_TYPE is
    	  when  RADAR_A =>
            null;
    	  when  RADAR_B  =>
            null;
    	  when  RADAR_C =>
            null;            
        end case;
      end record;

How would I specify a variant record which will only allow me to
select RADAR_A for the RADAR_TYPE_CHOICE and RADAR_A_STATE for the
command choice but not RADAR_C_STATE?