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Newsgroups: comp.lang.ada
Subject: Re: Enumeration representation clause surprise.
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From: Samuel Tardieu <sam@rfc1149.net>
Date: Wed, 11 Jun 2008 17:56:12 +0200
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Date: 2008-06-11T18:00:01+02:00
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Adam> This seems odd to me.  Having GNAT select a biased component in
Adam> Christoph's example makes some sense, since a compiler can choose any
Adam> representation it likes.  But in Markus' case, he specifically asked
Adam> for a certain representation for the enumeration types---should GNAT
Adam> take it upon itself to change that, and display a warning that doesn't
Adam> make it clear that it's disrespecting his request to have the
Adam> enumeration represented a certain way?
Adam> 
Adam> I dunno... maybe this would be acceptable to some, and apparently
Adam> Markus thinks it's OK, but ... it's just not what I would expect ...
Adam> I guess it's a subjective thing.

I would prefer an error indeed, but I can't seem to find a clause in
chapter 13 which says that in records with representation clauses the
representation given for objects when created independently the
enumeration representation clause must be honored.

Anyway, the patch I submitted will probably be evaluated by AdaCore
language lawyers. If an error must be signalled, then the warning will
be transformed into one.

  Sam