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Date: Fri, 04 Nov 2005 08:36:46 -0600
From: "Marc A. Criley" <mcNOSPAM@mckae.com>
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Subject: Re: Default rep specs for record types - documented??
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Date: 2005-11-04T08:36:46-06:00
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Steve wrote:
> "Anonymous Coward" <bogus_addy@bogus_domain.net> wrote in message 
> news:slrndmloee.kq0.bogus_addy@tango.mindfuq.org...
> 
>>I'm interested in finding out what the default representation of a
>>record type is.  Can I expect the sequence of elements in the default
>>representation to match the sequence they are defined in?
>>
> 
> Look in the Ada 95 LRM section 13, Representation Issues
> 
> Section 13.1 paragraph 19
> 
> If an aspect of representation of an entity is not specified, it is chosen 
> by default in an unspecified manner.
> 
> So... if it matters, use a representation clause.

Another way to do this, if you just want to guarantee component 
ordering, and you don't mind some extra padding possibly being added 
into the record instances, is to apply pragma Convention (C, ...) to the 
record.

While that convention is (obviously) nominally intended for interfacing 
to external C software, it has the desired effect of preventing 
reordering of record components.

-- Marc A. Criley
-- McKae Technologies
-- www.mckae.com
-- DTraq - XPath In Ada - XML EZ Out