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From: mcc@entropy.cs.princeton.edu (Martin C. Carlisle)
Subject: Re: Thank you
Date: 1999/09/08
Message-ID: <7r6ea2$pr8$1@cnn.Princeton.EDU>#1/1
X-Deja-AN: 522638498
References: <7r5vh3$imu1@svlss.lmms.lmco.com>
 <7r6acf$imu3@svlss.lmms.lmco.com>
Organization: US Air Force Academy, Dept of Computer Science
Newsgroups: comp.lang.ada
Date: 1999-09-08T00:00:00+00:00
List-Id: <comp.lang.ada>

It sounds like you did something like the following:
with ada.integer_text_io;
with ada.text_io;
procedure test_discrim is
  type bob(discrim : integer := 1) is record
     dummy : integer;
  end record;
  
  type fred is array(integer range <>) of bob;
  x : fred(1..10);
begin
  for i in x'range loop
     x(i) := bob'(discrim => i, dummy => 0);
  end loop;
  
  for i in x'range loop
     ada.integer_text_io.put(x(i).discrim);
     ada.text_io.new_line;
  end loop;
end test_discrim;

But, I still don't see why discrim can't just be a field of the 
record.  (I guess you do have the advantage that discrim can't
be modified w/o reassigning the entire record.)

--Martin

In article <7r6acf$imu3@svlss.lmms.lmco.com>,
Bruce Detter <bruce.detter@lmco.com> wrote:
>
>Bruce Detter <bruce.detter@lmco.com> wrote in message
>news:7r5vh3$imu1@svlss.lmms.lmco.com...
>> How do you declare an array of variant records where each variant record's
>> descriminant is the array index?  Can it be done at all?  I would prefer
>not
>> to use access pointers if it can be avoided.
>Thank you for your response, a little experimentation based on Mr. Heaney's
>solution provided the answer.  I used a default variant for the array type
>declaration, and "re-initialized" the array elements to what I wanted when
>the array was instanciated.
>
>Professor Carlisle, I have several "message" structures I receive, each with
>1 or more states I need to represent with ascii characters.  I wanted to
>have a single place where I could look up the ascii characters up based on
>the message type and state.  There is probably several ways I could have
>done this including wrapping the message structure with in a tagged record
>and using polymorphism,  but I choose the down and dirty, brute force method
>(for the time being)
-- 
Martin C. Carlisle, Asst Prof of Computer Science, US Air Force Academy
carlislem@acm.org, http://www.usafa.af.mil/dfcs/bios/carlisle.html
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policy of the US Air Force Academy or the United States Government.