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From: Christoph Grein <Christoph.Grein@eurocopter.com>
Newsgroups: comp.lang.ada
Subject: Re: for Object_Size use 0
Date: Thu, 14 Apr 2005 07:20:48 +0200
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Date: 2005-04-14T07:20:48+02:00

Robert A Duff wrote:

> "Robert C. Leif" <rleif@rleif.com> writes:
>
>  
>
>>      I specifically need to know if it is possible to create a zero 
>> sized
>> type in Ada 95 or the updated standard, which is to be released in 
>> the near
>> future.
>>   
>
>
> For a discrete type, Size can be zero.  So in your example:
>
>    type Empty_Type is (Empty);
>
> Empty_Type'Size must be zero (if there is no Size clause).
> This follows from RM-13.3(55).  The same is true of
> "subtype S is Integer range 0..0;" -- S'Size = 0 by default.
> See also para 55.b in the AARM.
>
But this is only "Implementation Advice". Consequently RM-13.3(55) uses 
the word "should".

But you're the language lawyer...