- Boost - lists.boost.org

Reshaping a vector/matrix using UBLAS
by Arne Hansen 11 Jan '07

11 Jan '07

Hello all Boost users. I need to figure out if it is possible to reshape a 30x30x30 matrix into a 1x27000 vector, and the other way around. My vector is way bigger, but if a 30x30x30 matrix can be reshaped into a 1x27000 vector and back, so can a huge vector of size 5505720 elements. So please help me find out if reshaping like this is possible. Thank you

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[system] - review of boost::system?
by Oliver.Kowalke＠qimonda.com 11 Jan '07

11 Jan '07

Hello, I'm using boost::system (from the Vault) - especially error_code and system_error. I'de like to see it in the next release 1.34. Would it be the author agree for adding this library for code review? Regards,Oliver

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Is it legal to reuse code snippets from a boost library in my own library?
by Oliver.Kowalke＠qimonda.com 11 Jan '07

11 Jan '07

Hello, I'de liketo ask if it is legal to reuse code snippets from a boost library in my own library which is also licenced under boost licence? Regards, Oliver

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Support requests report
by Marshall Clow 11 Jan '07

11 Jan '07

[ Creeping up... ] Support count: 50 29 nobody 4 grafik 3 vladimir_prus 3 jsiek 2 turkanis 2 johnmaddock 2 az_sw_dude 1 urzuga 1 speedsnail 1 samuel_k 1 jbandela 1 fcacciola Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: support new 2007 DST rules for timezone db Bug #: 1471723 <http://sourceforge.net/tracker/index.php?func=detail&aid=1471723&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: new timezone db file for #1471723 - 2007 DST support Bug #: 1478619 <http://sourceforge.net/tracker/index.php?func=detail&aid=1478619&group_id=7…> Assignee: fcacciola <http://sourceforge.net/users/fcacciola/> Summary: boost::optional<enum> fails with /CLR Bug #: 973424 <http://sourceforge.net/tracker/index.php?func=detail&aid=973424&group_id=75…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: Jam Fails to Build Bug #: 954048 <http://sourceforge.net/tracker/index.php?func=detail&aid=954048&group_id=75…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: Compiling only needed version Bug #: 1377001 <http://sourceforge.net/tracker/index.php?func=detail&aid=1377001&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: libraries won't build Bug #: 1524001 <http://sourceforge.net/tracker/index.php?func=detail&aid=1524001&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: Having some trouble building boost Bug #: 1534701 <http://sourceforge.net/tracker/index.php?func=detail&aid=1534701&group_id=7…> Assignee: jbandela <http://sourceforge.net/users/jbandela/> Summary: Visual C++ 'Language Extensions' support Bug #: 1039338 <http://sourceforge.net/tracker/index.php?func=detail&aid=1039338&group_id=7…> Assignee: johnmaddock <http://sourceforge.net/users/johnmaddock/> Summary: Regex Bug #: 1156957 <http://sourceforge.net/tracker/index.php?func=detail&aid=1156957&group_id=7…> Assignee: johnmaddock <http://sourceforge.net/users/johnmaddock/> Summary: regex - perl syntax affects what gets matched Bug #: 1519824 <http://sourceforge.net/tracker/index.php?func=detail&aid=1519824&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: Boost with Dinkumware C++ Library !? Bug #: 531963 <http://sourceforge.net/tracker/index.php?func=detail&aid=531963&group_id=75…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: creating my own properties Bug #: 619615 <http://sourceforge.net/tracker/index.php?func=detail&aid=619615&group_id=75…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: Max Flow Algorithm Bug #: 1445526 <http://sourceforge.net/tracker/index.php?func=detail&aid=1445526&group_id=7…> Assignee: nobody Summary: configure problem with aCC Bug #: 811040 <http://sourceforge.net/tracker/index.php?func=detail&aid=811040&group_id=75…> Assignee: nobody Summary: Problem compiling :/ Bug #: 942349 <http://sourceforge.net/tracker/index.php?func=detail&aid=942349&group_id=75…> Assignee: nobody Summary: boost for ARM platform? Bug #: 957850 <http://sourceforge.net/tracker/index.php?func=detail&aid=957850&group_id=75…> Assignee: nobody Summary: problem with debug builds on Solaris Bug #: 965747 <http://sourceforge.net/tracker/index.php?func=detail&aid=965747&group_id=75…> Assignee: nobody Summary: SLOOOWW tokenizer compilation on VC++6.0 Bug #: 969590 <http://sourceforge.net/tracker/index.php?func=detail&aid=969590&group_id=75…> Assignee: nobody Summary: BOOST ON WIN CE Bug #: 1101724 <http://sourceforge.net/tracker/index.php?func=detail&aid=1101724&group_id=7…> Assignee: nobody Summary: Error: Template with C linkage Bug #: 1109438 <http://sourceforge.net/tracker/index.php?func=detail&aid=1109438&group_id=7…> Assignee: nobody Summary: Link VC6 to Boost Bug #: 1118381 <http://sourceforge.net/tracker/index.php?func=detail&aid=1118381&group_id=7…> Assignee: nobody Summary: Boost on opteron AMD Bug #: 1200700 <http://sourceforge.net/tracker/index.php?func=detail&aid=1200700&group_id=7…> Assignee: nobody Summary: Linker Problems with VC .NET 2003 / STLPort / Boost Bug #: 1292345 <http://sourceforge.net/tracker/index.php?func=detail&aid=1292345&group_id=7…> Assignee: nobody Summary: Unable to build boost with Dinkumware STL version 4.02 Bug #: 1336312 <http://sourceforge.net/tracker/index.php?func=detail&aid=1336312&group_id=7…> Assignee: nobody Summary: Problem running configure for unsupported platform Bug #: 1339778 <http://sourceforge.net/tracker/index.php?func=detail&aid=1339778&group_id=7…> Assignee: nobody Summary: Configuration Bug #: 1380808 <http://sourceforge.net/tracker/index.php?func=detail&aid=1380808&group_id=7…> Assignee: nobody Summary: Embedded python won't compile Bug #: 1391956 <http://sourceforge.net/tracker/index.php?func=detail&aid=1391956&group_id=7…> Assignee: nobody Summary: Building universal binary on MacOSX Bug #: 1409774 <http://sourceforge.net/tracker/index.php?func=detail&aid=1409774&group_id=7…> Assignee: nobody Summary: symbian os Bug #: 1428189 <http://sourceforge.net/tracker/index.php?func=detail&aid=1428189&group_id=7…> Assignee: nobody Summary: Cross compiling boost for Windows CE (ARM) from VS2005 Bug #: 1457763 <http://sourceforge.net/tracker/index.php?func=detail&aid=1457763&group_id=7…> Assignee: nobody Summary: compiler is out of heap space in pass 2 Bug #: 1481122 <http://sourceforge.net/tracker/index.php?func=detail&aid=1481122&group_id=7…> Assignee: nobody Summary: Boost.Build v2 build script help for evc4 Bug #: 1498919 <http://sourceforge.net/tracker/index.php?func=detail&aid=1498919&group_id=7…> Assignee: nobody Summary: Compiling Shmem Bug #: 1504379 <http://sourceforge.net/tracker/index.php?func=detail&aid=1504379&group_id=7…> Assignee: nobody Summary: Bjam build should support attachment of individual build ids Bug #: 1530168 <http://sourceforge.net/tracker/index.php?func=detail&aid=1530168&group_id=7…> Assignee: nobody Summary: Having problems with building boost Bug #: 1545941 <http://sourceforge.net/tracker/index.php?func=detail&aid=1545941&group_id=7…> Assignee: nobody Summary: Building Boost with Open Watcom Compiler Bug #: 1547257 <http://sourceforge.net/tracker/index.php?func=detail&aid=1547257&group_id=7…> Assignee: nobody Summary: '-shared' not supported for linking under MacOS X Bug #: 1553825 <http://sourceforge.net/tracker/index.php?func=detail&aid=1553825&group_id=7…> Assignee: nobody Summary: failing on 6 targets in MacOS X Bug #: 1572712 <http://sourceforge.net/tracker/index.php?func=detail&aid=1572712&group_id=7…> Assignee: nobody Summary: bjam: command not found Bug #: 1586479 <http://sourceforge.net/tracker/index.php?func=detail&aid=1586479&group_id=7…> Assignee: nobody Summary: Problem building boost serialization library Bug #: 1610347 <http://sourceforge.net/tracker/index.php?func=detail&aid=1610347&group_id=7…> Assignee: nobody Summary: Boost on Mac w. CodeWarrior Bug #: 1610475 <http://sourceforge.net/tracker/index.php?func=detail&aid=1610475&group_id=7…> Assignee: nobody Summary: Building Boost with VS C++ 2005 express problem Bug #: 1616142 <http://sourceforge.net/tracker/index.php?func=detail&aid=1616142&group_id=7…> Assignee: samuel_k <http://sourceforge.net/users/samuel_k/> Summary: Boost.Format doesn't work on MSVC with /vd2 compiler option Bug #: 1545133 <http://sourceforge.net/tracker/index.php?func=detail&aid=1545133&group_id=7…> Assignee: speedsnail <http://sourceforge.net/users/speedsnail/> Summary: Multithreaded process pausing but not deadlocking or crashin Bug #: 1280829 <http://sourceforge.net/tracker/index.php?func=detail&aid=1280829&group_id=7…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: Boost.Iostreams and newline translation Bug #: 1299123 <http://sourceforge.net/tracker/index.php?func=detail&aid=1299123&group_id=7…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: boost.iostreams file_descriptor and sharing Bug #: 1445474 <http://sourceforge.net/tracker/index.php?func=detail&aid=1445474&group_id=7…> Assignee: urzuga <http://sourceforge.net/users/urzuga/> Summary: lambda vs pure virtual functions Bug #: 1231445 <http://sourceforge.net/tracker/index.php?func=detail&aid=1231445&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: program_options Can one have options with optional values? Bug #: 1102652 <http://sourceforge.net/tracker/index.php?func=detail&aid=1102652&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: program_options Can one have options with optional values? Bug #: 1102664 <http://sourceforge.net/tracker/index.php?func=detail&aid=1102664&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: program_options bug? Bug #: 1114084 <http://sourceforge.net/tracker/index.php?func=detail&aid=1114084&group_id=7…> -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.

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[Boost-bugs] [ boost-Patches-1627420 ] [thread] MSVS: Allow use of thread headers with /Za
by SourceForge.net 11 Jan '07

11 Jan '07

Patches item #1627420, was opened at 2007-01-03 18:17 Message generated for change (Settings changed) made by david_abrahams You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1627420&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: sohail (sohail_) >Assigned to: Anthony Williams (anthonyw) Summary: [thread] MSVS: Allow use of thread headers with /Za Initial Comment: The following code will not compile if built with /Za on Visual C++ 7.1+: #include <boost/thread/once.hpp> int main(){} It will fail with the following assertion: # error "Threading support unavaliable: it has been explicitly disabled with BOOST_DISABLE_THREADS" The reason is that the Boost.Config machinery realizes that you cannot use the Windows API unless you enable language extensions. As a result, threads cannot be available. This is correct behaviour when you are indeed *using* the Windows API. However, in the above case where you separately compile the threads library, you do not actually use the Windows API => language extensions are not necessary => no need to explicitly specify BOOST_DISABLE_WIN32. I therefore submit that there be some machinery/configuration variables to allow libraries to specify whether or not they require the Windows API. The proposed patch does not modify existing behaviour. That is, if the config machinery decides that the API is needed, it is required, unless explicitly disabled. The code to do this in library xyz would look something like this: #if defined(BOOST_BUILDING_WHATEVER) # define BOOST_NO_REQUIRE_WIN32 #endif #include <boost/config.hpp> I am uncertain of the exact name of the macro that is required but I am certain a macro is required. The attached patch is against 1.33.1. I don't think there is any rush to put this into 1.34. I'm pretty sure it would be nice, but people can manually patch it until 1.35 whenever that is released. Thanks, Sohail ---------------------------------------------------------------------- Comment By: sohail (sohail_) Date: 2007-01-05 22:46 Message: Logged In: YES user_id=1682817 Originator: YES File Added: 0_boost_building_threads.patch ---------------------------------------------------------------------- Comment By: sohail (sohail_) Date: 2007-01-05 15:23 Message: Logged In: YES user_id=1682817 Originator: YES See also this thread: http://thread.gmane.org/gmane.comp.lib.boost.user/23774/focus=23774 For a discussion that seems to converge on having Boost.Config not touch BOOST_DISABLE_THREADS ---------------------------------------------------------------------- Comment By: sohail (sohail_) Date: 2007-01-03 18:40 Message: Logged In: YES user_id=1682817 Originator: YES File Added: boost_no_require_win32.patch ---------------------------------------------------------------------- Comment By: sohail (sohail_) Date: 2007-01-03 18:25 Message: Logged In: YES user_id=1682817 Originator: YES That should be: #if !defined(BOOST_BUILDING_WHATEVER) :) ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1627420&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[Boost-bugs] [ boost-Patches-1612399 ] new links in boost homepage:Meta-Comm, IRC
by SourceForge.net 11 Jan '07

11 Jan '07

Patches item #1612399, was opened at 2006-12-09 19:42 Message generated for change (Settings changed) made by david_abrahams You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1612399&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Janek Kozicki (cosurgi) >Assigned to: David Abrahams (david_abrahams) Summary: new links in boost homepage:Meta-Comm,IRC Initial Comment: A followup from boost mailing list: Re: [boost] Web access to CVS, #boost IRC channel David Abrahams said: (by the date of Sat, 09 Dec 2006 07:54:16 -0500) > Please submit a patch. ----------------------------- A short patch to index.html, the boost homepage, that adds three new links: 1. Meta-Comm snapshots 2. Web CVS 3. #boost IRC channel on freenode ---------------------------------------------------------------------- Comment By: Janek Kozicki (cosurgi) Date: 2006-12-11 06:37 Message: Logged In: YES user_id=814536 Originator: YES the patch to more/mailing_lists.htm File Added: mailing_lists_htm_IRC.diff ---------------------------------------------------------------------- Comment By: Janek Kozicki (cosurgi) Date: 2006-12-11 06:36 Message: Logged In: YES user_id=814536 Originator: YES another followup: removed link to WebCVS, and added a short note about IRC channel in more/mailing_lists.htm to which now points a link from the front page. File Added: index_htm_meta_comm_IRC.diff ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1612399&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[Boost-bugs] [ boost-Patches-1583399 ] [test] evc4 issue with SEH support
by SourceForge.net 11 Jan '07

11 Jan '07

Patches item #1583399, was opened at 2006-10-24 03:24 Message generated for change (Settings changed) made by david_abrahams You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1583399&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Michael Fink (vividos) >Assigned to: Gennadiy Rozental (rogeeff) Summary: [test] evc4 issue with SEH support Initial Comment: Hi, I'm trying to port Boost 1.34 to the eMbedded Visual C++ compiler. I encountered an error in boost/test/impl/execution_monitor.ipp where it is checked if the platform being used supports SEH and defines BOOST_MS_STRUCTURED_EXCEPTION_HANDLING in that case. evc4 and the Windows CE 4.2 platform supports SEH, but it doesn't provide <eh.h> for setting structured exception translators. For this reason this patch disables the whole feature, at least for Windows CE 4.2. It additionally patches a line where a warning is output with the preprocessor statement "#warning" that isn't supported on evc4. I think the more portable version of this is "#pragma message". ---------------------------------------------------------------------- Comment By: Michael Fink (vividos) Date: 2006-10-24 03:26 Message: Logged In: YES user_id=124874 I just saw that this is a duplicate of patch #1499418. The only difference is that it limits the exclusion of the code to Windows CE 4.2, as that is the only platform I could test compiling. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1583399&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[Boost-bugs] [ boost-Patches-1583396 ] [mpl] evc4 port
by SourceForge.net 11 Jan '07

11 Jan '07

Patches item #1583396, was opened at 2006-10-24 03:16 Message generated for change (Settings changed) made by david_abrahams You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1583396&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: Michael Fink (vividos) >Assigned to: Aleksey Gurtovoy (agurtovoy) Summary: [mpl] evc4 port Initial Comment: Hi, I'm trying to port Boost 1.34 CVS to the eMbedded Visual C++ 4 compiler. In many projects there are compiler errors that lead back to MPL header files located in boost\mpl\aux_\preprocessed\msvc60\, or.hpp and and.hpp. They produce the following errors (example for or.hpp): or.hpp(41) : error C2908: explicit specialization; 'or_impl<0>' has already been instantiated from the primary template or.hpp(41) : error C2039: 'result_' : is not a member of '`global namespace'' or.hpp(41) : error C2143: syntax error : missing ';' before '<' or.hpp(41) : error C2059: syntax error : '<' or.hpp(43) : error C2143: syntax error : missing ';' before '{' or.hpp(43) : error C2447: missing function header (old-style formal list?) The following patch would add the necessary specialisation for or_impl<true> and and_impl<true> to the struct definition directly, and only for the evc4 compiler (msvc8 with ARM target wouldn't use the alternative code). As I guess from the folders name the files are auto-generated. If the patch is rejected, is there a possibility to generate the proper code for the evc4-compiler? ---------------------------------------------------------------------- Comment By: Mateusz Loskot (mloskot) Date: 2006-10-24 09:11 Message: Logged In: YES user_id=736047 The eVC++ 4.0 compiler is based on Visual C++ 6.0, so templates support is weak. Theoretically, is it feasible to build MPL using these compiler at all? Mateusz Loskot ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1583396&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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[Boost-bugs] [ boost-Patches-1388901 ] [concept_check.hpp] remove unused variable warning in msvc
by SourceForge.net 11 Jan '07

11 Jan '07

Patches item #1388901, was opened at 2005-12-23 08:52 Message generated for change (Settings changed) made by david_abrahams You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1388901&group_… Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: None Group: None Status: Open Resolution: None Priority: 5 Private: No Submitted By: hxpro (hxpro) >Assigned to: Jeremy Siek (jsiek) Summary: [concept_check.hpp] remove unused variable warning in msvc Initial Comment: simple enough fix ---------------------------------------------------------------------- Comment By: Ronald Garcia (rgarcia) Date: 2007-01-05 11:28 Message: Logged In: YES user_id=17144 Originator: NO Not sure why this was assigned to me... ---------------------------------------------------------------------- Comment By: João Abecasis (biochimia) Date: 2006-02-04 09:21 Message: Logged In: YES user_id=840777 After reviewing the patch it looks all of valid, correct, appropriate, trivial and harmless. The ignore_unused_variable_warning workaround is already used in the file to patch in a lot of places. The fact that it isn't used in this one looks like an oversight. Ok to commit? ---------------------------------------------------------------------- Comment By: hxpro (hxpro) Date: 2006-01-10 04:34 Message: Logged In: YES user_id=1211438 So I suppose it helps if I actually attatched the patch ... Related to this patch, would it be a good idea to promote the unused_variable helper to a more public place? I belive UBLAS uses a similar mechanism but not this actual one because its kind of hidden, ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=307586&aid=1388901&group_… ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Boost-bugs mailing list Boost-bugs(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/boost-bugs

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Re: [boost] Review request: Boost.FSM
by Steven Watanabe 10 Jan '07

10 Jan '07

AMDG Andrey Semashev wrote: > Right, thanks for finding this. I'll try to fix it. I guess, I'll have > to create a global mutex object for the assignment operations and lock > it prior to other two locks and assignment. I think that this works: locking_state_machine& operator= (locking_state_machine const& that) { if(boost::addressof(that) != this) { const bool lock_this_first = boost::addressof(m_Mutex) < boost::addressof(that.m_Mutex); scoped_lock that_lock(lock_this_first? m_Mutex : that.m_Mutex); scoped_lock this_lock(lock_this_first? that.m_Mutex : m_Mutex); base_type::operator= (static_cast< base_type const& >(that)); } return *this; } In Christ, Steven Watanabe

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