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From: Corey Minyard <minyard@acm.org>
Subject: Representation clause in records?
Date: 1999/02/05
Message-ID: <m2iudgijh1.fsf@wf-rch.cirr.com>#1/1
X-Deja-AN: 441149013
Sender: minyard@wf-rch.cirr.com
Organization: Wonderforce Research
Reply-To: minyard@acm.org
Newsgroups: comp.lang.ada
Date: 1999-02-05T00:00:00+00:00
List-Id: <comp.lang.ada>

In section 3.8 of the RM we see:

(1)   A record object is a composite object consisting of named
      components. The value of a record object is a composite value
      consisting of the values of the components.

Syntax

(2)   record_type_definition ::= [[abstract] tagged] [limited] record_definition
(3)   record_definition ::=
           record
              component_list
           end record
         | null record
(4)   component_list ::=
             component_item {component_item}
          | {component_item} variant_part
          |  null;
(5)   component_item ::= component_declaration | representation_clause
(6)   component_declaration ::=
          defining_identifier_list : component_definition [:= default_expression];

I am playing around with ASIS and I was to the point of handling the
representation clause here.  My question is: What is the representation
clause specified in (5)?  I have it from a reliable source that the
following is not legal:

package Test1 is

   type T1 is record
      A : Integer;
      for A'Size use 32;
   end record;

end Test1;

So what is the RM saying here?  ASIS seems to allow something of this
affect, but I didn't find any text in the RM section that talked about
this construct.

-- 
Corey Minyard                   Internet:  minyard@acm.org
  Work: minyard@nortelnetworks.com  UUCP:  minyard@wf-rch.cirr.com