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-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,b1a96e8174ef9f99
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2003-11-10 05:48:05 PST
Path: archiver1.google.com!postnews1.google.com!not-for-mail
From: mark_doherty@yahoo.co.uk (Mark Doherty)
Newsgroups: comp.lang.ada
Subject: Re: Need Value of enum type not position.
Date: 10 Nov 2003 05:48:05 -0800
Organization: http://groups.google.com
Message-ID: <5e3e03a7.0311100548.48704613@posting.google.com>
References: <686be06c.0311071027.79d6fa21@posting.google.com>
NNTP-Posting-Host: 81.132.188.199
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Trace: posting.google.com 1068472085 1696 127.0.0.1 (10 Nov 2003 13:48:05
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Mon, 10 Nov 2003 13:48:05 +0000 (UTC)
Xref: archiver1.google.com comp.lang.ada:2296
Date: 2003-11-10T05:48:05-08:00
List-Id: <comp.lang.ada>

dallex@erols.com (Daniel Allex) wrote in message news:<686be06c.0311071027.79d6fa21@posting.google.com>...
> With the following declaration:
>  
>    type Hov_Mode_Type is 
>          (INVALID,  
>           OFF,      
>           INITIATE, 
>           AUTO); 
>    for Hov_Mode_Type use(
>       INVALID  => 7, 
>       OFF      => 8, 
>       INITIATE => 9, 
>       AUTO     => 10);
> 
> I can get the position 
>    Ada.Text_IO.Put_Line(Integer'Image(Hov_Mode_Type'Pos(I)));
> Which returns 0,1,2, or 3.  What I want is the value of 7,8,9,10.  I
> can't get 'val to work.  need some help.

You can use a lookup table, unchecked_conversion or an address
overlay.
I would use lookups where you are not mapping directly to hardware,
otherwise unchecked_conversion is safer (than address overlays) as is
can do compile and runtime checks. Use address overlays where
performance in important.
 
with ada.text_io; use ada.text_io;
with ada.unchecked_conversion;

procedure test is

   Hov_Mode_Type_size : constant := 16;
   
   type Hov_Mode_Type is
          (INVALID,
           OFF,
           INITIATE,
           AUTO);
	for Hov_Mode_Type'size use Hov_Mode_Type_size;
    for Hov_Mode_type use 
          (INVALID  => 7,
           OFF      => 8,
           INITIATE => 9,
           AUTO     => 10);
      
   type raw_hov_mode_type is range 7..10;
   
   for raw_hov_mode_type'size use Hov_Mode_Type_size;
   function unchecked is new ada.unchecked_conversion (
     source => hov_mode_type, 
     target => raw_hov_mode_type);
                                                       
   lookup : constant array ( Hov_Mode_Type) of raw_hov_mode_type := 
          (INVALID  => 7,
           OFF      => 8,
           INITIATE => 9,
           AUTO     => 10);

   hov_mode : hov_mode_type := off;
   
   unchecked_hov_mode : constant raw_hov_mode_type :=
unchecked(hov_mode);
   
   overlayed_hov_mode : raw_hov_mode_type;
   for overlayed_hov_mode'address use hov_mode'address;
   
   lookup_hov_mode : constant raw_hov_mode_type := lookup(hov_mode);
   
begin
   put_line("unchecked => " &
raw_hov_mode_type'image(unchecked_hov_mode));
   put_line("overlayed => " &
raw_hov_mode_type'image(overlayed_hov_mode));
   put_line("lookuped  => " &
raw_hov_mode_type'image(lookup_hov_mode));
end;