From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00
	autolearn=unavailable autolearn_force=no version=3.4.4
Path: 
 buffer2.nntp.dca1.giganews.com!border2.nntp.dca1.giganews.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!feeder.erje.net!eu.feeder.erje.net!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: 'Size hack for enumerated types
Date: Tue, 08 Jul 2014 08:04:06 +0100
Organization: A noiseless patient Spider
Message-ID: <lytx6scowp.fsf@pushface.org>
References: <lp9nc6$no3$1@speranza.aioe.org> <lyk37rcwah.fsf@pushface.org>
 <lp9t79$5pj$1@speranza.aioe.org> <lp9tj0$6ii$1@speranza.aioe.org>
 <ly38eefbkf.fsf@pushface.org> <lpckgk$6a8$1@speranza.aioe.org>
 <lpcm62$nug$1@dont-email.me> <lpeg5s$f6r$1@speranza.aioe.org>
 <ly7g3pdreg.fsf@pushface.org> <lpevj6$nai$1@speranza.aioe.org>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: mx05.eternal-september.org;
 posting-host="5cbec41b82bafb9ba55107f02585e18b";
 logging-data="18782"; mail-complaints-to="abuse@eternal-september.org";
 posting-account="U2FsdGVkX19qwVeld+rwaZWR6u+5lVMJA5Vww8DmhdY="
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (darwin)
Cancel-Lock: sha1:9+SHknBsJv1NIJt4FLCfzxJ+TYg=
 sha1:kC3Is2MsayymlIfipeI7uQfX0aA=
Xref: number.nntp.dca.giganews.com comp.lang.ada:187443
Date: 2014-07-08T08:04:06+01:00
List-Id: <comp.lang.ada>

Victor Porton <porton@narod.ru> writes:

> Simon Wright wrote:
>
>> Victor Porton <porton@narod.ru> writes:
>> 
>>> Where in the Reference Manual it is said that Ada enumeration types
>>> are "equivalent" to C int (=enum) type?
>> 
>> Annex B.1 (http://www.ada-auth.org/standards/12rm/html/RM-B-1.html),
>> 
>> 2  The Convention aspect is used to indicate that an Ada entity should
>>    use the conventions of another language.
>> 
>> 21 If the Convention aspect is specified for a type, then the type shall
>>    either be compatible with or eligible for the specified convention.
>
> No reason to assume either of:
>
> 1. Ada enumeration is compatible with C int/enum.
>
> 2. Ada enumeration is eligible for the specified convention (the
> convention C).
>
> This is a work for a future standard.
>
> It seems that the current one does not assert neither 1 neither 2. :-(

Well, try submitting it to the ARG. I expect you'll get rebuffed in
short order.

I tried

   type Flag_Type is (Libxml_Error_Save,
                      Libxml_Structured_Error_Save,
		      URI_Interning,
                      WWW_Skip_Init_Finish) with Size => 3, Convention => C;

and GNAT said "warning: C enum types have the size of a C int" (I had
hoped this would have been an error, not a warning).