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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
References: <382nx7mt637x$.6hjqgb4zxzss.dlg@40tude.net>
 <u8xkkosk0.fsf@stephe-leake.org> <n03kqae9v6ah$.hjxa120hu8oq$.dlg@40tude.net>
Subject: Re: Address of an object
Date: Tue, 19 Sep 2006 19:43:13 -0500
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Date: 2006-09-19T19:43:13-05:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
news:n03kqae9v6ah$.hjxa120hu8oq$.dlg@40tude.net...
...
> type P is access String;
> for P'Storage_Pool use My_Pool;
>
> procedure Allocate (Pool : My_Pool; Addr : out Storage_Address; ...) is
> begin
>    ...
>    Addr := A;
> end Allocate;
>
> P := new String'("abc");
>
> Then compare A with P.all'Address. They will differ. A = P.all'Address -
8,
> I guess. [ It is not yet another bug of GNAT, it is a proper behavior. ARM
> explicitly requires this.]

For what it's worth, Janus/Ada does this right (currently -- I suppose
someday we might change it to match the RM, but it is unlikely -- we'd have
to ban address clauses of any object with discontiguous parts, which is
silly). I argued against this change to 'Address in Ada 95, but I seem to
have been a minority of 1 -- so it's nice to see someone else who cares.

                               Randy.