A bunch of new Yahoo bounce examples, courtesy of David Abrahams.

SF patch # 538983

8 files changed, 909 insertions, 0 deletions

diff --git a/tests/bounces/yahoo_02.txt b/tests/bounces/yahoo_02.txt
new file mode 100644
index 000000000..90d835dc9
--- /dev/null
+++ b/tests/bounces/yahoo_02.txt
diff --git a/tests/bounces/yahoo_03.txt b/tests/bounces/yahoo_03.txt
new file mode 100644
index 000000000..9de32a43b
--- /dev/null
+++ b/tests/bounces/yahoo_03.txt
@@ -0,0 +1,98 @@
+Return-Path: <boost-admin@lists.boost.org>
+Received: from mx04.mrf.mail.rcn.net ([207.172.4.53] [207.172.4.53])
+          by mta02.mrf.mail.rcn.net with ESMTP
+          id <20020403141004.PXBK1795.mta02.mrf.mail.rcn.net@mx04.mrf.mail.rcn.net>;
+          Wed, 3 Apr 2002 09:10:04 -0500
+Received: from milliways.osl.iu.edu ([129.79.245.239])
+	by mx04.mrf.mail.rcn.net with esmtp (Exim 3.35 #5)
+	id 16slSd-0006Tx-00
+	for david.abrahams@rcn.com; Wed, 03 Apr 2002 09:10:04 -0500
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+	Wed, 3 Apr 2002 09:10:00 -0500
+Received: from mta545.mail.yahoo.com (mta545.mail.yahoo.com [216.136.131.27])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with SMTP id g33E9DA22332
+	for <boost-admin@lists.boost.org>; Wed, 3 Apr 2002 09:09:13 -0500
+Date: Wed, 3 Apr 2002 09:09:13 -0500
+Message-Id: <200204031409.g33E9DA22332@milliways.osl.iu.edu>
+From: MAILER-DAEMON@yahoo.com
+To: boost-admin@lists.boost.org
+X-Loop: MAILER-DAEMON@yahoo.com
+Subject: Delivery failure
+Sender: boost-owner@lists.boost.org
+Errors-To: boost-owner@lists.boost.org
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+List-Id: Boost mailing list <boost.lists.boost.org>
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+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+
+Message from yahoo.com.
+Unable to deliver message to the following address(es).
+
+<cresus22@yahoo.com>:
+Sorry your message to cresus22@yahoo.com cannot be delivered. This account has been disabled or discontinued.
+
+--- Original message follows.
+
+X-Rocket-Spam: 129.79.245.239
+X-YahooFilteredBulk: 129.79.245.239
+X-Track: 111: 20
+Return-Path: <boost-admin@lists.boost.org>
+Received: from milliways.osl.iu.edu (129.79.245.239)
+  by mta545.mail.yahoo.com with SMTP; 03 Apr 2002 06:09:04 -0800 (PST)
+Received: from milliways.osl.iu.edu (localhost [127.0.0.1])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33D6PA21151;
+	Wed, 3 Apr 2002 08:06:25 -0500
+Received: from exchsrv.uttc-utc.com ([63.80.119.4])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33D42A21076
+	for <boost@lists.boost.org>; Wed, 3 Apr 2002 08:04:03 -0500
+Received: by EXCHSRV with Internet Mail Service (5.5.2653.19)
+	id <G9MVAA8Z>; Wed, 3 Apr 2002 08:03:59 -0500
+Message-ID: <2FE8C75C7A06D4118BB50008C7F7E83103D5DF@EXCHSRV>
+From: "Moore, Dave" <dmoore@ashtontechgroup.com>
+To: "'boost@lists.boost.org'" <boost@lists.boost.org>
+MIME-Version: 1.0
+X-Mailer: Internet Mail Service (5.5.2653.19)
+Content-Type: text/plain;
+	charset="iso-8859-1"
+Subject: [boost] OT(?) Top Posting, Discussion Threads, and Outlook/Exchange
+Sender: boost-admin@lists.boost.org
+Errors-To: boost-admin@lists.boost.org
+X-BeenThere: boost@lists.boost.org
+X-Mailman-Version: 2.0.8
+Precedence: bulk
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+List-Post: <mailto:boost@lists.boost.org>
+List-Subscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=subscribe>
+List-Id: Boost mailing list <boost.lists.boost.org>
+List-Unsubscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 3 Apr 2002 08:03:58 -0500
+
+Since the recent discussion-discussion, I just tried to reply the "right"
+way in "RE: [boost] Thread locals", only to see my efforts cheerfully
+ignored by the Mailing List archive.
+(http://lists.boost.org/MailArchives/boost/)
+
+I am stuck with Outlook 2000 + Exchange 5.5 here at work, but have some
+considerable pull with the Exchange Admin.  
+
+I notice that my replies have the "References:" field stripped off.  Any
+Boosters successfully using this email combination, preserving the
+references field?
+
+Thanks, and sorry for the noise.
+Dave
+_______________________________________________
+Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
+.
diff --git a/tests/bounces/yahoo_04.txt b/tests/bounces/yahoo_04.txt
new file mode 100644
index 000000000..cf6036360
--- /dev/null
+++ b/tests/bounces/yahoo_04.txt
@@ -0,0 +1,150 @@
+Return-Path: <boost-admin@lists.boost.org>
+Received: from mx04.mrf.mail.rcn.net ([207.172.4.53] [207.172.4.53])
+          by mta05.mrf.mail.rcn.net with ESMTP
+          id <20020403144504.BXMM19155.mta05.mrf.mail.rcn.net@mx04.mrf.mail.rcn.net>;
+          Wed, 3 Apr 2002 09:45:04 -0500
+Received: from milliways.osl.iu.edu ([129.79.245.239])
+	by mx04.mrf.mail.rcn.net with esmtp (Exim 3.35 #5)
+	id 16sm0V-0007O8-00
+	for david.abrahams@rcn.com; Wed, 03 Apr 2002 09:45:04 -0500
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+	Wed, 3 Apr 2002 09:45:01 -0500
+Received: from mta468.mail.yahoo.com (mta468.mail.yahoo.com [216.136.130.133])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with SMTP id g33EibA23012
+	for <boost-admin@lists.boost.org>; Wed, 3 Apr 2002 09:44:37 -0500
+Date: Wed, 3 Apr 2002 09:44:37 -0500
+Message-Id: <200204031444.g33EibA23012@milliways.osl.iu.edu>
+From: MAILER-DAEMON@yahoo.com
+To: boost-admin@lists.boost.org
+X-Loop: MAILER-DAEMON@yahoo.com
+Subject: Delivery failure
+Sender: boost-owner@lists.boost.org
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+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+
+Message from yahoo.com.
+Unable to deliver message to the following address(es).
+
+<agarciamartiartu@yahoo.es>:
+Sorry, your message to agarciamartiartu@yahoo.es cannot be delivered.  This account is over quota.
+
+<open00now@yahoo.co.uk>:
+Sorry, your message to open00now@yahoo.co.uk cannot be delivered.  This account is over quota.
+
+--- Original message follows.
+
+X-Track: 0: 100
+Return-Path: <boost-admin@lists.boost.org>
+Received: from milliways.osl.iu.edu (129.79.245.239)
+  by mta468.mail.yahoo.com with SMTP; 03 Apr 2002 06:44:13 -0800 (PST)
+Received: from milliways.osl.iu.edu (localhost [127.0.0.1])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33EgcA22988;
+	Wed, 3 Apr 2002 09:42:38 -0500
+Received: from mail2.commerzbank.com (mail2.commerzbank.com [212.149.48.101])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33EciA22890
+	for <boost@lists.boost.org>; Wed, 3 Apr 2002 09:38:44 -0500
+Received: from sv016317.exchange.commerzbank.com (sendmail.commerzbank.com [172.16.71.150])
+	by mail2.commerzbank.com (Commerzbank Mail-System) with ESMTP id 38105116C
+	for <boost@lists.boost.org>; Wed,  3 Apr 2002 16:35:15 +0200 (CEST)
+Received: by sv016317.exchange.commerzbank.com with Internet Mail Service (5.5.2653.19)
+	id <2GBLGLD2>; Wed, 3 Apr 2002 16:37:33 +0200
+Message-ID: <CD3F0650BD65D31191BF0008C75D8DBD0300F66F@SV018443>
+From: "Hoeffner, Detlef" <Detlef.Hoeffner@partner.commerzbank.com>
+To: "'boost@lists.boost.org'" <boost@lists.boost.org>
+Subject: RE: [boost] Thread locals
+MIME-Version: 1.0
+X-Mailer: Internet Mail Service (5.5.2653.19)
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+List-Unsubscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 3 Apr 2002 16:37:41 +0200
+
+
+> As a substitute, try using the comparison operator for the boost::thread
+> class.  This can fill the gap in many (but not all) cases where you are
+> managing the set of threads yourself.
+
+I need this mainly for tracing purposes in spots where I have no knowledge 
+of the current instance of thread. This does not seem to help me in that
+case.
+
+> On some platforms (i.e. pthreads), the "thread_id" is actually an opaque
+> type (pthread_t) rather than a numeric value, and I think that is why no
+> such operation is exposed in the current version of the library.
+
+It is however possible to provide a class threadid, that has dependent on
+the
+platform different members but provides operations as ==, !=, 
+operator<<(ostream&, ), ... That would be fine to solve the problem.
+
+Regards
+
+Detlef
+
+-----Original Message-----
+From: Moore, Dave [mailto:dmoore@ashtontechgroup.com]
+Sent: Mittwoch, 3. April 2002 14:33
+To: 'boost@lists.boost.org'
+Subject: RE: [boost] Thread locals
+
+
+> -----Original Message-----
+> From: Hoeffner, Detlef 
+> [mailto:Detlef.Hoeffner@partner.commerzbank.com]
+> Sent: Wednesday, April 03, 2002 6:59 AM
+> To: 'boost@lists.boost.org'
+> Subject: [boost] Thread locals
+> 
+> 
+> Hello all,
+> 
+> I am replacing my thread abstraction with the thread package 
+> from boost. It
+> is very nice but I am missing two things. 
+> 
+> The first is the possibility to get an identifier for the 
+> current thread, a
+> thread id.
+
+As a substitute, try using the comparison operator for the boost::thread
+class.  This can fill the gap in many (but not all) cases where you are
+managing the set of threads yourself.
+
+On some platforms (i.e. pthreads), the "thread_id" is actually an opaque
+type (pthread_t) rather than a numeric value, and I think that is why no
+such operation is exposed in the current version of the library.
+
+Regards,
+Dave
+
+
+_______________________________________________
+Unsubscribe & other changes:
+http://lists.boost.org/mailman/listinfo.cgi/boost
+_______________________________________________
+Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
+.
diff --git a/tests/bounces/yahoo_05.txt b/tests/bounces/yahoo_05.txt
new file mode 100644
index 000000000..56d1a3018
--- /dev/null
+++ b/tests/bounces/yahoo_05.txt
@@ -0,0 +1,150 @@
+Return-Path: <boost-admin@lists.boost.org>
+Received: from mx04.mrf.mail.rcn.net ([207.172.4.53] [207.172.4.53])
+          by mta05.mrf.mail.rcn.net with ESMTP
+          id <20020403160106.EMCB19155.mta05.mrf.mail.rcn.net@mx04.mrf.mail.rcn.net>;
+          Wed, 3 Apr 2002 11:01:06 -0500
+Received: from milliways.osl.iu.edu ([129.79.245.239])
+	by mx04.mrf.mail.rcn.net with esmtp (Exim 3.35 #5)
+	id 16snC5-0003g7-00
+	for david.abrahams@rcn.com; Wed, 03 Apr 2002 11:01:06 -0500
+Received: from milliways.osl.iu.edu (localhost [127.0.0.1])
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+Received: from mta414.mail.yahoo.com (mta414.mail.yahoo.com [216.136.128.66])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with SMTP id g33G02A24708
+	for <boost-admin@lists.boost.org>; Wed, 3 Apr 2002 11:00:03 -0500
+Date: Wed, 3 Apr 2002 11:00:03 -0500
+Message-Id: <200204031600.g33G02A24708@milliways.osl.iu.edu>
+From: MAILER-DAEMON@yahoo.com
+To: boost-admin@lists.boost.org
+X-Loop: MAILER-DAEMON@yahoo.com
+Subject: Delivery failure
+Sender: boost-owner@lists.boost.org
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+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+
+Message from yahoo.com.
+Unable to deliver message to the following address(es).
+
+<cresus22@yahoo.com>:
+Sorry your message to cresus22@yahoo.com cannot be delivered. This account has been disabled or discontinued.
+
+<jjb700@yahoo.com>:
+Sorry your message to jjb700@yahoo.com cannot be delivered. This account has been disabled or discontinued.
+
+--- Original message follows.
+
+X-Track: 1: 40
+Return-Path: <boost-admin@lists.boost.org>
+Received: from milliways.osl.iu.edu (129.79.245.239)
+  by mta414.mail.yahoo.com with SMTP; 03 Apr 2002 07:59:49 -0800 (PST)
+Received: from milliways.osl.iu.edu (localhost [127.0.0.1])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33EduA22960;
+	Wed, 3 Apr 2002 09:39:56 -0500
+Received: from mail2.commerzbank.com (mail2.commerzbank.com [212.149.48.101])
+	by milliways.osl.iu.edu (8.11.6/8.11.6/IUCS_2.44) with ESMTP id g33EciA22890
+	for <boost@lists.boost.org>; Wed, 3 Apr 2002 09:38:44 -0500
+Received: from sv016317.exchange.commerzbank.com (sendmail.commerzbank.com [172.16.71.150])
+	by mail2.commerzbank.com (Commerzbank Mail-System) with ESMTP id 38105116C
+	for <boost@lists.boost.org>; Wed,  3 Apr 2002 16:35:15 +0200 (CEST)
+Received: by sv016317.exchange.commerzbank.com with Internet Mail Service (5.5.2653.19)
+	id <2GBLGLD2>; Wed, 3 Apr 2002 16:37:33 +0200
+Message-ID: <CD3F0650BD65D31191BF0008C75D8DBD0300F66F@SV018443>
+From: "Hoeffner, Detlef" <Detlef.Hoeffner@partner.commerzbank.com>
+To: "'boost@lists.boost.org'" <boost@lists.boost.org>
+Subject: RE: [boost] Thread locals
+MIME-Version: 1.0
+X-Mailer: Internet Mail Service (5.5.2653.19)
+Content-Type: text/plain;
+	charset="iso-8859-1"
+Sender: boost-admin@lists.boost.org
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+X-BeenThere: boost@lists.boost.org
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+Precedence: bulk
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+List-Help: <mailto:boost-request@lists.boost.org?subject=help>
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+List-Subscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=subscribe>
+List-Id: Boost mailing list <boost.lists.boost.org>
+List-Unsubscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 3 Apr 2002 16:37:41 +0200
+
+
+> As a substitute, try using the comparison operator for the boost::thread
+> class.  This can fill the gap in many (but not all) cases where you are
+> managing the set of threads yourself.
+
+I need this mainly for tracing purposes in spots where I have no knowledge 
+of the current instance of thread. This does not seem to help me in that
+case.
+
+> On some platforms (i.e. pthreads), the "thread_id" is actually an opaque
+> type (pthread_t) rather than a numeric value, and I think that is why no
+> such operation is exposed in the current version of the library.
+
+It is however possible to provide a class threadid, that has dependent on
+the
+platform different members but provides operations as ==, !=, 
+operator<<(ostream&, ), ... That would be fine to solve the problem.
+
+Regards
+
+Detlef
+
+-----Original Message-----
+From: Moore, Dave [mailto:dmoore@ashtontechgroup.com]
+Sent: Mittwoch, 3. April 2002 14:33
+To: 'boost@lists.boost.org'
+Subject: RE: [boost] Thread locals
+
+
+> -----Original Message-----
+> From: Hoeffner, Detlef 
+> [mailto:Detlef.Hoeffner@partner.commerzbank.com]
+> Sent: Wednesday, April 03, 2002 6:59 AM
+> To: 'boost@lists.boost.org'
+> Subject: [boost] Thread locals
+> 
+> 
+> Hello all,
+> 
+> I am replacing my thread abstraction with the thread package 
+> from boost. It
+> is very nice but I am missing two things. 
+> 
+> The first is the possibility to get an identifier for the 
+> current thread, a
+> thread id.
+
+As a substitute, try using the comparison operator for the boost::thread
+class.  This can fill the gap in many (but not all) cases where you are
+managing the set of threads yourself.
+
+On some platforms (i.e. pthreads), the "thread_id" is actually an opaque
+type (pthread_t) rather than a numeric value, and I think that is why no
+such operation is exposed in the current version of the library.
+
+Regards,
+Dave
+
+
+_______________________________________________
+Unsubscribe & other changes:
+http://lists.boost.org/mailman/listinfo.cgi/boost
+_______________________________________________
+Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
+.
diff --git a/tests/bounces/yahoo_06.txt b/tests/bounces/yahoo_06.txt
new file mode 100644
index 000000000..16c04fd65
--- /dev/null
+++ b/tests/bounces/yahoo_06.txt
@@ -0,0 +1,105 @@
+Return-Path: <boost-admin@lists.boost.org>
+Received: from mx04.mrf.mail.rcn.net ([207.172.4.53] [207.172.4.53])
+          by mta03.mrf.mail.rcn.net with ESMTP
+          id <20020403160604.WVKA16695.mta03.mrf.mail.rcn.net@mx04.mrf.mail.rcn.net>;
+          Wed, 3 Apr 2002 11:06:04 -0500
+Received: from milliways.osl.iu.edu ([129.79.245.239])
+	by mx04.mrf.mail.rcn.net with esmtp (Exim 3.35 #5)
+	id 16snGt-0005FB-00
+	for david.abrahams@rcn.com; Wed, 03 Apr 2002 11:06:04 -0500
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+Date: Wed, 3 Apr 2002 11:05:47 -0500
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+From: MAILER-DAEMON@yahoo.com
+To: boost-admin@lists.boost.org
+X-Loop: MAILER-DAEMON@yahoo.com
+Subject: Delivery failure
+Sender: boost-owner@lists.boost.org
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+--- Original message follows.
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+Message-ID: <2FE8C75C7A06D4118BB50008C7F7E83103D5DF@EXCHSRV>
+From: "Moore, Dave" <dmoore@ashtontechgroup.com>
+To: "'boost@lists.boost.org'" <boost@lists.boost.org>
+MIME-Version: 1.0
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+Subject: [boost] OT(?) Top Posting, Discussion Threads, and Outlook/Exchange
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+Date: Wed, 3 Apr 2002 08:03:58 -0500
+
+Since the recent discussion-discussion, I just tried to reply the "right"
+way in "RE: [boost] Thread locals", only to see my efforts cheerfully
+ignored by the Mailing List archive.
+(http://lists.boost.org/MailArchives/boost/)
+
+I am stuck with Outlook 2000 + Exchange 5.5 here at work, but have some
+considerable pull with the Exchange Admin.  
+
+I notice that my replies have the "References:" field stripped off.  Any
+Boosters successfully using this email combination, preserving the
+references field?
+
+Thanks, and sorry for the noise.
+Dave
+_______________________________________________
+Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
+.
diff --git a/tests/bounces/yahoo_07.txt b/tests/bounces/yahoo_07.txt
new file mode 100644
index 000000000..1f35e70f0
--- /dev/null
+++ b/tests/bounces/yahoo_07.txt
@@ -0,0 +1,112 @@
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+--- Original message follows.
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+Received: from hotmail.com (f110.law10.hotmail.com [64.4.15.110])
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+From: "Vesa Karvonen" <vesa_karvonen@hotmail.com>
+To: boost@lists.boost.org
+Subject: Re: [boost] [Type Traits] Patch for type_with_alignment 
+Mime-Version: 1.0
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+	<mailto:boost-request@lists.boost.org?subject=subscribe>
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+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 03 Apr 2002 16:16:59 +0300
+
+>On Fri, 29 Mar 2002, David Abrahams wrote:
+>>Are you planning to apply this patch?
+>>
+>>-Dave
+>
+>Yes, but I can't right now. I'll apply it tomorrow if it hasn't already
+>been done.
+>
+>	Doug
+
+How is the patch coming up (or did I miss some post on this subject)?
+
+I'm also working on something that could use type_with_alignment<>.
+
+
+_________________________________________________________________
+Join the world’s largest e-mail service with MSN Hotmail. 
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+
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+.
diff --git a/tests/bounces/yahoo_08.txt b/tests/bounces/yahoo_08.txt
new file mode 100644
index 000000000..c531cef9b
--- /dev/null
+++ b/tests/bounces/yahoo_08.txt
@@ -0,0 +1,129 @@
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+Message from yahoo.com.
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+--- Original message follows.
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+Content-Type: text/plain;
+  charset="iso-8859-1"
+From: Douglas Gregor <gregod@cs.rpi.edu>
+Organization: Rensselaer Polytechnic Institute
+To: boost@lists.boost.org
+Subject: Re: [boost] [Type Traits] Patch for type_with_alignment
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+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 3 Apr 2002 11:21:18 -0500
+
+On Wednesday 03 April 2002 10:34 am, you wrote:
+> Douglas Gregor:
+> >type_with_alignment<> is available in CVS.
+>
+> hmm... You are right, but it is in the compiler_supported_error_messages
+> branch. Is this intentional?
+
+It was a rogue sticky tag... type_with_alignment<> is now on the CVS main 
+trunk, where it was supposed to be in the first place.
+
+> >I'm guessing we should also add aligned_storage somewhere, because I'm
+> >sure quite a few of us will use it:
+>
+> Good idea.
+>
+> >Maybe this belongs in utility/aligned_storage.hpp?
+>
+> I have a feeling that something like this should probably go somewhere
+> closer to <memory> rather than <utility>.
+
+<boost/memory.hpp>? I'd really like to have more than 6 lines in it, but we 
+can do that. That'd probably be a good place for the small-string 
+optimization allocator as well.
+
+	Doug
+_______________________________________________
+Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
+.
+
diff --git a/tests/bounces/yahoo_09.txt b/tests/bounces/yahoo_09.txt
new file mode 100644
index 000000000..f8067a5b4
--- /dev/null
+++ b/tests/bounces/yahoo_09.txt
@@ -0,0 +1,165 @@
+Return-Path: <boost-admin@lists.boost.org>
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+          Wed, 3 Apr 2002 14:01:04 -0500
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+From: MAILER-DAEMON@yahoo.com
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+	for <boost@lists.boost.org>; Wed, 3 Apr 2002 12:38:58 -0500
+Received: from ppp-1-53.chel-5800-8.access.uk.tiscali.com (HELO albert) (RaoulGough@212.159.169.53 with login)
+  by smtp.mail.vip.sc5.yahoo.com with SMTP; 3 Apr 2002 17:38:54 -0000
+Message-ID: <001601c1db36$6da28950$0100a8c0@albert>
+From: "Raoul Gough" <RaoulGough@yahoo.co.uk>
+To: <boost@lists.boost.org>
+References: <200204011702.g31H2eA04494@milliways.osl.iu.edu>
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+Subject: [boost] Re: boost::weak_ptr suggestions
+Sender: boost-admin@lists.boost.org
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+X-Mailman-Version: 2.0.8
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+	<mailto:boost-request@lists.boost.org?subject=subscribe>
+List-Id: Boost mailing list <boost.lists.boost.org>
+List-Unsubscribe: <http://lists.boost.org/mailman/listinfo.cgi/boost>,
+	<mailto:boost-request@lists.boost.org?subject=unsubscribe>
+List-Archive: <http://lists.boost.org/MailArchives/boost/>
+Date: Wed, 3 Apr 2002 18:37:55 +0100
+
+> From: "Peter Dimov" <pdimov@mmltd.net>
+> To: <boost@lists.boost.org>
+> Subject: Re: [boost] boost::weak_ptr suggestions
+> Date: Mon, 1 Apr 2002 17:31:05 +0300
+> Organization: Multi Media Ltd.
+> Reply-To: boost@lists.boost.org
+>
+> From: "Raoul Gough" <RaoulGough@yahoo.co.uk>
+[snip]
+> > Secondly, I believe it would be better for the get() method to throw or
+> > assert when called on an invalidated pointer, instead of transparently
+> > returning 0. In my opinion, there is a fundamental difference between
+the
+> > two states (null and invalid) which is not observable with the current
+> > interface. The addition of a member function like "bool is_valid()
+const;"
+> > would also allow the user code to decide how to deal with an invalid
+> > pointer, instead of merging the two distinct states into the one (null)
+> > state.
+>
+> Right again. However, the primary methods of accessing a weak_ptr are (1)
+> constructing a shared_ptr (which does throw) and (2) make_shared. get()
+has
+> been retained for efficiency but is not recommended (in multithreaded
+> programs.)
+
+So why the difference in error semantics between the single and
+multi-threaded idioms? For example, if I converted single-threaded code that
+uses get() to thread-safe code using make_shared, I also get changed
+semantics for the invalid pointer case.
+
+Incidentally, it looks like the use_count member function can determine
+indirectly whether the target still exists or not. It seems a bit obscure
+though, seeing as the reference count is really an implementation detail and
+distinct from the concept of null/valid/invalid.
+
+>
+> > The big advantage of considering invalid.get() an error is that code
+which
+> > then works without error using weak_ptr would have *exactly* unchanged
+> > semantics using a plain pointer replacement. This allows (for example) a
+> > debug build/release build choice between weak_ptr<T> and T* for
+> performance
+> > reasons. If weak_ptr<T> silently returns null on invalid pointers, then
+> this
+> > guarantee cannot be made - what would be undefined use on a plain
+pointer
+> is
+> > not detected by the weak_ptr.
+>
+> Interesting point. You can write your own get() that does what you want:
+>
+> T * get(weak_ptr<T> const & p)
+> {
+>     return shared_ptr<T>(p).get();
+> }
+>
+> but it's not as efficient as a throwing get(). Most people seem to prefer
+> the current get() semantics, though, where 0 is returned.
+
+Well, I can understand that point of view as well - either the weak pointer
+has a valid target object or not (in which case null or deleted doesn't
+really matter). However, my use of a smart weak pointer is really as a
+debugging aid, so I would like the error to be detected as soon as possible
+(and distinguished from a null-pointer assertion or SEGV). Short of adding a
+policy class template parameter, it would be easy to add a new member
+function which does get() with severe checking - along the lines of
+vector.at versus vector.operator[]. Just an idea.
+
+BTW, am I right in thinking that sharede_ptr always maintains an extra weak
+reference counter? I mean, even if my code doesn't use weak_ptr, shared_ptr
+still has to maintain the extra counter, right? That, combined with the 
+*** MESSAGE TRUNCATED ***
+
+
+.