From: Bill Findlay <yaldnif.w@blueyonder.co.uk>
Subject: Re: Have the Itanium critics all been proven wrong?
Date: Wed, 22 Aug 2012 16:21:27 +0100
Date: 2012-08-22T16:21:27+01:00 [thread overview]
Message-ID: <CC5AB787.1BE95%yaldnif.w@blueyonder.co.uk> (raw)
In-Reply-To: k12shq$4ii$1@dont-email.me
On 22/08/2012 16:06, in article k12shq$4ii$1@dont-email.me, "Brian Drummond"
<brian@shapes.demon.co.uk> wrote:
> On Wed, 22 Aug 2012 07:00:31 -0700, Michael S wrote:
>
>> On Aug 22, 3:39�pm, Brian Drummond <br...@shapes.demon.co.uk> wrote:
>>> On Wed, 22 Aug 2012 03:32:00 -0700, Michael S wrote:
>
> [... discussion of private types exported to module A from B]
>>> This puts B in charge of the object lifetimes; if A wants to access a
>>> stale object, expect an exception.
>>
>> Exception, if I am lucky.
>> If I am less lucky, the physical place of old auto object is now
>> occupied by new auto object of the same or compatible type and the call
>> to accessor caused silent corruption.
>
> If a module has exported a pointer to an "auto object" then the
> accessibility checks have been circumvented by unchecked_access or
> unchecked_conversion. In which case ... yes, caveat programmer!
>
> Pointers passed from a module will generally be to static or dynamic
> objects. Which, if dynamic, can be freed by unchecked_deallocation.
> Again : caveat programmer.
Worth pointing out that access types /cannot/ point to auto objects unless
declared as "access all", and in Ada it is unusual to do so, as pointers to
non-heap objects are very much less needed than in other languages.
--
Bill Findlay
with blueyonder.co.uk;
use surname & forename;
next prev parent reply other threads:[~2012-08-26 14:10 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5021874F.1747D0BF@sonic.net>
[not found] ` <1e1tf9-0kp2.ln1@ntp6.tmsw.no>
[not found] ` <k0gn5r$l9h$1@needham.csi.cam.ac.uk>
[not found] ` <GPRWr.31944$Bw1.31300@newsfe05.iad>
[not found] ` <k0gq97$li8$1@needham.csi.cam.ac.uk>
[not found] ` <k0h6ef$jke$1@speranza.aioe.org>
[not found] ` <46f19bfc-930e-4f06-b5a6-c60f39cfda0c@p14g2000yqk.googlegroups.com>
[not found] ` <k0r609$4ij$1@speranza.aioe.org>
[not found] ` <077b12f6-1196-4b5c-bbdb-04291b1ae616@q22g2000vbx.googlegroups.com>
[not found] ` <k0rree$lkn$1@speranza.aioe.org>
[not found] ` <CC5730C5.1BC2E%yaldnif.w@blueyonder.co.uk>
[not found] ` <k0t67b$b8r$1@speranza.aioe.org>
[not found] ` <CC585119.1BCCC%yaldnif.w@blueyonder.co.uk>
[not found] ` <k0uenp$fbg$1@speranza.aioe.org>
[not found] ` <k0vo9u$fer$1@dont-email.me>
[not found] ` <589825d2-d998-456a-9c37-c8ae13e1e7bc@e29g2000vbm.googlegroups.com>
2012-08-21 20:48 ` Have the Itanium critics all been proven wrong? Niklas Holsti
2012-08-21 22:32 ` Robert A Duff
[not found] ` <keb838pn40uf3pq1536e9b3dptgd57h3se@invalid.netcom.com>
2012-08-22 2:32 ` Bill Findlay
2012-08-22 2:42 ` Adam Beneschan
2012-08-22 4:08 ` Bill Findlay
2012-08-22 4:40 ` Adam Beneschan
2012-08-22 9:29 ` Michael S
2012-08-22 10:14 ` Dmitry A. Kazakov
2012-08-22 10:28 ` Ludovic Brenta
2012-08-22 12:48 ` Brian Drummond
2012-08-22 15:42 ` Ludovic Brenta
2012-08-22 10:54 ` Niklas Holsti
2012-08-22 12:43 ` Michael S
2012-08-22 13:20 ` Michael S
2012-08-22 22:30 ` Randy Brukardt
[not found] ` <k10tdr$nm6$1@dont-email.me>
[not found] ` <bb4e5231-142b-437c-8c2a-bbd6daf34df8@g2g2000vba.googlegroups.com>
2012-08-22 12:39 ` Brian Drummond
2012-08-22 14:00 ` Michael S
2012-08-22 15:06 ` Brian Drummond
2012-08-22 15:21 ` Bill Findlay [this message]
2012-08-22 15:59 ` Michael S
2012-08-22 16:01 ` Michael S
2012-08-22 16:58 ` Georg Bauhaus
2012-08-22 18:18 ` Bill Findlay
2012-08-22 15:05 ` Simon Wright
[not found] <k0jkb3$hm1$1@dont-email.me>
[not found] ` <632eec054470aafb59e98744e950ea8b@dizum.com>
[not found] ` <k0m5c3$t6t$1@dont-email.me>
[not found] ` <CC545B6F.1BA11%yaldnif.w@blueyonder.co.uk>
2012-08-22 22:35 ` Bill Findlay
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox