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From: "David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>
Subject: Re: Problem with representation clause
Date: 1997/12/09
Message-ID: <66jdsu$q9n$1@polo.advicom.net>#1/1
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References: <66gvas$pmp@remus.rutgers.edu>
 <mheaney-ya023680000812972317260001@news.ni.net>
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Date: 1997-12-09T00:00:00+00:00
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Matthew Heaney wrote in message ...
>In article <66gvas$pmp@remus.rutgers.edu>, castroto@remus.rutgers.edu
>(Fabrizio Castrotorres) wrote:
>
>Try adding the Component_Size attribute too.
>

The Component_Size attribute makes no difference in the resulting size;

The implementation advice of the Ada95 LRM 13.3(73) says

An implementation should support specified Component_Sizes that are factors
and multiples of the word size. For such Component_Sizes, the array should
contain no gaps between components. For other Component_Sizes (if
supported), the array should contain no gaps between components when packing
is also specified; the implementation should forbid this combination in
cases where it cannot support a no-gaps representation.


Perhaps the operative words here are "advice" and "should"

At any rate, a two dimensional array declared as

   type Global_Integrity_Array_2 is array( Slot_Number, Slot_Number ) of
      Measurement_Status_Value;
   pragma Pack(Global_Integrity_Array_2);

yields a size of 1152 bits with gnat-3.10p

David C. Hoos, Sr.
david.c.hoos.sr@ada95.com