May 2007 - Boost - lists.preview.boost.org

Patches report
by Marshall Clow 04 May '07

04 May '07

[ Unchanged from Monday ] Patch count: 29 4 nobody 3 vladimir_prus 3 david_abrahams 3 agurtovoy 2 turkanis 2 rogeeff 1 urzuga 1 shammah 1 pdimov 1 jsiek 1 johnmaddock 1 grafik 1 glassfordm 1 dlwalker 1 dgregor 1 az_sw_dude 1 anthonyw 1 alnsn Assignee: agurtovoy <http://sourceforge.net/users/agurtovoy/> Summary: Adjusts mpl::pair concept to be compatible with STL pairs Bug #: 1489713 <http://sourceforge.net/tracker/index.php?func=detail&aid=1489713&group_id=7…> Assignee: agurtovoy <http://sourceforge.net/users/agurtovoy/> Summary: [mpl] evc4 port Bug #: 1583396 <http://sourceforge.net/tracker/index.php?func=detail&aid=1583396&group_id=7…> Assignee: agurtovoy <http://sourceforge.net/users/agurtovoy/> Summary: [mpl] Detect nested template members with has_template_xxx Bug #: 1685351 <http://sourceforge.net/tracker/index.php?func=detail&aid=1685351&group_id=7…> Assignee: alnsn <http://sourceforge.net/users/alnsn/> Summary: lexical_cast - local variable shadow patch Bug #: 1665462 <http://sourceforge.net/tracker/index.php?func=detail&aid=1665462&group_id=7…> Assignee: anthonyw <http://sourceforge.net/users/anthonyw/> Summary: [thread] MSVS: Allow use of thread headers with /Za Bug #: 1627420 <http://sourceforge.net/tracker/index.php?func=detail&aid=1627420&group_id=7…> Assignee: az_sw_dude <http://sourceforge.net/users/az_sw_dude/> Summary: Unused variable in format date parser Bug #: 1652860 <http://sourceforge.net/tracker/index.php?func=detail&aid=1652860&group_id=7…> Assignee: david_abrahams <http://sourceforge.net/users/david_abrahams/> Summary: add shared_ptr< const T> support Bug #: 1684708 <http://sourceforge.net/tracker/index.php?func=detail&aid=1684708&group_id=7…> Assignee: david_abrahams <http://sourceforge.net/users/david_abrahams/> Summary: [parameter] fix operator|| for lazy binding Bug #: 1685360 <http://sourceforge.net/tracker/index.php?func=detail&aid=1685360&group_id=7…> Assignee: david_abrahams <http://sourceforge.net/users/david_abrahams/> Summary: inconsistent usage of function pointer typedefs Bug #: 1707377 <http://sourceforge.net/tracker/index.php?func=detail&aid=1707377&group_id=7…> Assignee: dgregor <http://sourceforge.net/users/dgregor/> Summary: boost::graph::graph_utility.hpp is_connected() bad call Bug #: 1688009 <http://sourceforge.net/tracker/index.php?func=detail&aid=1688009&group_id=7…> Assignee: dlwalker <http://sourceforge.net/users/dlwalker/> Summary: [integer] add support for integers longer than long Bug #: 1507034 <http://sourceforge.net/tracker/index.php?func=detail&aid=1507034&group_id=7…> Assignee: glassfordm <http://sourceforge.net/users/glassfordm/> Summary: [thread] thread_specific_ptr::element_type ? Bug #: 1686705 <http://sourceforge.net/tracker/index.php?func=detail&aid=1686705&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> Summary: bjam: always define OSPLAT Bug #: 1619769 <http://sourceforge.net/tracker/index.php?func=detail&aid=1619769&group_id=7…> Assignee: johnmaddock <http://sourceforge.net/users/johnmaddock/> Summary: [config] evc4 port Bug #: 1489359 <http://sourceforge.net/tracker/index.php?func=detail&aid=1489359&group_id=7…> Assignee: jsiek <http://sourceforge.net/users/jsiek/> Summary: [concept_check.hpp] remove unused variable warning in msvc Bug #: 1388901 <http://sourceforge.net/tracker/index.php?func=detail&aid=1388901&group_id=7…> Assignee: nobody Summary: [utility] Make result_of handle lambda expressions Bug #: 1685354 <http://sourceforge.net/tracker/index.php?func=detail&aid=1685354&group_id=7…> Assignee: nobody Summary: [iostreams] workaround for the boost + stdcxx on MSVC 7.1 Bug #: 1693879 <http://sourceforge.net/tracker/index.php?func=detail&aid=1693879&group_id=7…> Assignee: nobody Summary: patch for Visual Studio 8 + Windows x64 (AMD64) Bug #: 1703358 <http://sourceforge.net/tracker/index.php?func=detail&aid=1703358&group_id=7…> Assignee: nobody Summary: gccxml compilation bug under Windows Bug #: 1709604 <http://sourceforge.net/tracker/index.php?func=detail&aid=1709604&group_id=7…> Assignee: pdimov <http://sourceforge.net/users/pdimov/> Summary: support for weak_ptr binding Bug #: 1633503 <http://sourceforge.net/tracker/index.php?func=detail&aid=1633503&group_id=7…> Assignee: rogeeff <http://sourceforge.net/users/rogeeff/> Summary: [test] no eh exception handling functions on evc4 Bug #: 1499418 <http://sourceforge.net/tracker/index.php?func=detail&aid=1499418&group_id=7…> Assignee: rogeeff <http://sourceforge.net/users/rogeeff/> Summary: [test] evc4 issue with SEH support Bug #: 1583399 <http://sourceforge.net/tracker/index.php?func=detail&aid=1583399&group_id=7…> Assignee: shammah <http://sourceforge.net/users/shammah/> Summary: pool allocator - local variable shadow patch Bug #: 1665468 <http://sourceforge.net/tracker/index.php?func=detail&aid=1665468&group_id=7…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: iostreams // file_descriptor::seek BUG on files > 4 GB Bug #: 1452698 <http://sourceforge.net/tracker/index.php?func=detail&aid=1452698&group_id=7…> Assignee: turkanis <http://sourceforge.net/users/turkanis/> Summary: [iostreams] patch for building by BBv2 Bug #: 1687829 <http://sourceforge.net/tracker/index.php?func=detail&aid=1687829&group_id=7…> Assignee: urzuga <http://sourceforge.net/users/urzuga/> Summary: [lambda][utility] Make lambda support result<> Bug #: 1685367 <http://sourceforge.net/tracker/index.php?func=detail&aid=1685367&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: [program_options] static const variable on evc4 Bug #: 1499420 <http://sourceforge.net/tracker/index.php?func=detail&aid=1499420&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: [program_options] putenv on Solaris Bug #: 1568191 <http://sourceforge.net/tracker/index.php?func=detail&aid=1568191&group_id=7…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: VC80-Compatible String Processing in format_paragraph() Bug #: 1580068 <http://sourceforge.net/tracker/index.php?func=detail&aid=1580068&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.

1 0

Support requests report
by Marshall Clow 04 May '07

04 May '07

[ Unchanged from Monday ] Support count: 35 6 vladimir_prus 4 johnmaddock 4 grafik 3 nobody 3 jsiek 3 jbandela 2 turkanis 2 rogeeff 2 az_sw_dude 1 urzuga 1 shammah 1 samuel_k 1 fcacciola 1 djowel 1 agurtovoy Assignee: agurtovoy <http://sourceforge.net/users/agurtovoy/> Summary: duplicat initial members -> erase_key postcond. fail Bug #: 1642614 <http://sourceforge.net/tracker/index.php?func=detail&aid=1642614&group_id=7…> 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: djowel <http://sourceforge.net/users/djowel/> Summary: Embedded python won't compile Bug #: 1391956 <http://sourceforge.net/tracker/index.php?func=detail&aid=1391956&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: Linker Problems with VC .NET 2003 / STLPort / Boost Bug #: 1292345 <http://sourceforge.net/tracker/index.php?func=detail&aid=1292345&group_id=7…> Assignee: grafik <http://sourceforge.net/users/grafik/> 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: grafik <http://sourceforge.net/users/grafik/> Summary: Building universal binary on MacOSX Bug #: 1409774 <http://sourceforge.net/tracker/index.php?func=detail&aid=1409774&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: jbandela <http://sourceforge.net/users/jbandela/> Summary: Problem compiling :/ Bug #: 942349 <http://sourceforge.net/tracker/index.php?func=detail&aid=942349&group_id=75…> Assignee: jbandela <http://sourceforge.net/users/jbandela/> Summary: SLOOOWW tokenizer compilation on VC++6.0 Bug #: 969590 <http://sourceforge.net/tracker/index.php?func=detail&aid=969590&group_id=75…> 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: Problem running configure for unsupported platform Bug #: 1339778 <http://sourceforge.net/tracker/index.php?func=detail&aid=1339778&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: johnmaddock <http://sourceforge.net/users/johnmaddock/> Summary: Crash on RH machine with gcc < 3.4 Bug #: 1635211 <http://sourceforge.net/tracker/index.php?func=detail&aid=1635211&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: Problem build boost 1.33.1 on Aix 4.3.3 Bug #: 1689432 <http://sourceforge.net/tracker/index.php?func=detail&aid=1689432&group_id=7…> Assignee: nobody Summary: Building Boost with Apache C++ Standard Library (STDCXX) Bug #: 1693854 <http://sourceforge.net/tracker/index.php?func=detail&aid=1693854&group_id=7…> Assignee: nobody Summary: Assertion failed in token_iterator.hpp Bug #: 1707948 <http://sourceforge.net/tracker/index.php?func=detail&aid=1707948&group_id=7…> Assignee: rogeeff <http://sourceforge.net/users/rogeeff/> Summary: failing on 6 targets in MacOS X Bug #: 1572712 <http://sourceforge.net/tracker/index.php?func=detail&aid=1572712&group_id=7…> Assignee: rogeeff <http://sourceforge.net/users/rogeeff/> Summary: [Test Library] How to init/free a singleton Bug #: 1670855 <http://sourceforge.net/tracker/index.php?func=detail&aid=1670855&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: shammah <http://sourceforge.net/users/shammah/> Summary: warning using pool.hpp Bug #: 1663127 <http://sourceforge.net/tracker/index.php?func=detail&aid=1663127&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…> Assignee: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> 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: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> 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: vladimir_prus <http://sourceforge.net/users/vladimir_prus/> Summary: program_options strips off escaped quotes in some situations Bug #: 1677601 <http://sourceforge.net/tracker/index.php?func=detail&aid=1677601&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.

1 0

thread_safe_signals package
by Vadim Lebedev 04 May '07

04 May '07

Hello What will be the fate of thread_safe_signal package? I see that it did not get included in 1.34.0... Vadim

2 1

Any interest for stack_trace?
by Atry 04 May '07

04 May '07

Java programs are easy to debug, one who catch an exception can print the stack trace, and when it crash, it would print the stack, too. It is useful, so I wrote some code of stack_trace for C++, see the sample below: /***** sample.cpp *****/ #include <boost/stack_trace.hpp> #include <iostream> #include <sstream> using namespace boost; using namespace std; class exception_with_stack_trace : public exception { private: std::string what_; public: exception_with_stack_trace(const char* file, unsigned int line, const char* func) { stringstream ss; ss << "exception occurred at " << func << " (" << file << ":" << line << ")\n"; vector<stack_trace::element const *> const & st = stack_trace::get(); for(size_t i = st.size(); --i != 0; ) { ss << "\tfrom " << st[i]->tag() << " (" << st[i]->file() << ":" << st[i]->line() << ")\n"; } what_ = ss.str(); } virtual exception_with_stack_trace::~exception_with_stack_trace() throw (){} virtual const char * what() const throw () { return what_.c_str(); } }; void foo(int a) { BOOST_STACK_TRACK_CALL; cout << stack_trace::to_string() << endl; if(a == 1) { throw exception_with_stack_trace(__FILE__, __LINE__, __FUNCTION__); } } void foo() { BOOST_STACK_TRACK_CALL; foo(0); foo(1); cout << stack_trace::to_string() << endl; } void bar() { BOOST_STACK_TRACK_CALL; foo(); cout << stack_trace::to_string() << endl; } int main() { BOOST_STACK_TRACK_CALL; try { BOOST_STACK_TRACK_TAG("try"); foo(); cout << stack_trace::to_string() << endl; bar(); cout << stack_trace::to_string() << endl; } catch(exception& e) { cerr << e.what() << endl; } } /***** sample.cpp *****/ And run it to print below: 1> stdout sample.cpp 54 main sample.cpp 57 try sample.cpp 41 foo sample.cpp 32 foo sample.cpp 54 main sample.cpp 57 try sample.cpp 41 foo sample.cpp 32 foo 2> stderr exception occurred at foo (sample.cpp:36) from foo (sample.cpp:32) from foo (sample.cpp:41) from try (sample.cpp:57)

16 30

[thread] patch for tss.cpp (win32 + static linking support)
by Johan Nilsson 04 May '07

04 May '07

Hi, I believe I've found a bug in tss.cpp, for details please ref http://article.gmane.org/gmane.comp.lib.boost.user/26591 . The immediate fix is straightforward, it just involves resetting the native tss value after deleting the pointed-to data at thread exit. Patch is attached to this message. The changes only affects the Win32 platform and I've run the supplied tests under libs/thread/test to verify that it doesn't break anything obvious. As the bug involves dereferencing a dangling pointer and isn't detected most of the time, I'd really appreciate if the patch could be accepted as soon as possible. I'm awaiting Roland Schwartz to "bless" the patch. If he agrees, would it be possible to accept this for 1.34? / Johan

3 6

[rpc/marshal] prototype rpc / marshal library using asio and serialization (and futures in the future?)
by Stjepan Rajko 04 May '07

04 May '07

Hello, I have uploaded some documentation and code of a prototype RPC / marshal library: http://dancinghacker.com/code/marshal/ It differs from the one I attached yesterday in that it actually works :-) Tested on Win/MSVC, *should* build on GCC (haven't tested on GCC after recent changes). The code is pretty infant but shows some functionality. The docs on the above website show an example and some discussion points. In addition to what's listed at the website, I'm wondering what the proper way of returning the function call results would be... For example, if the function is void something(int &x), should the modified "x" value on the remote computer appear in the local x after the remote call returns? I can see that as being reasonable if the RPC is synchronous, but if it is asynchronous maybe something like a future would be a good way of providing the modified value? (speaking of, could someone suggest a futures implementation out of the ones that were floating around a while back?) The alternative would be to have all modified parameter values be stored in a call structure (which is what happens now with the regular return value) and accessible from there. Any suggestions welcome! Thanks, Stjepan

9 30

Re: [boost] Boost Asio on multi processor environment
by Gaurav.Jain＠iflexsolutions.com 03 May '07

03 May '07

Hi, I am designing a server which will going to run on multiprocessor and which will going to provide service to thousand of clients concurrently. I am using boost asio library to do this. I want to use one io_service object per CPU approach for this. Let me describe what I want... 1. I want to create ioservice object as per the no of CPU I have, so that I can distribute the load evenly. 2. How to create a list of ioservice object & make them running all the time even when there is no request to process. What's the definition of idle ioservice in this case... the one which is this the one which is not handling any connection? How can I choose a ioservice out of a pool of idle service whenever a new request comes from the client. 3. Can I restrict no of clients(connections) on each io service, lets say 500 connection on each ioservice or so ? Regards Gaurav Jain DISCLAIMER: This message contains privileged and confidential information and is intended only for an individual named. If you are not the intended recipient, you should not disseminate, distribute, store, print, copy or deliver this message. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete or contain viruses. The sender, therefore, does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. If verification is required, please request a hard-copy version.

3 2

Re: [boost] Boost Asio on multi processor environment
by Gaurav.Jain＠iflexsolutions.com 03 May '07

03 May '07

Hi, Christopher Kohlhoff <chris <at> kohlhoff.com> writes: > I'm sure I've outlined this in another email somewhere, but I can't find > it right now. Anyway, the basic idea is as follows: > > - Create an io_service for each CPU. > > - Create an io_service::work object for each io_service to keep it > running when it would otherwise have nothing else to do. > - Spawn a thread for each io_service to call io_service::run(). > - Create a tcp::acceptor on one of the io_services. > > - Create your tcp::socket objects on any of the io_services, using some > sort of load balancing scheme to choose the io_service to use (e.g. > round robin). > > - Ensure that all communication between io_services uses message > passing, i.e. use io_service::post(). > > The core of the work would probably happen in a handle_accept > function(), e.g. using the Daytime.3 tutorial program as a starting > point: > > void start_accept() > { > // ------> Load balance here <------ > tcp_connection::pointer new_connection = > tcp_connection::create(choose_io_service()); > > acceptor_.async_accept(new_connection->socket(), > boost::bind(&tcp_server::handle_accept, this, new_connection, > asio::placeholders::error)); > } > > void handle_accept(tcp_connection::pointer new_connection, > const asio::error_code& error) > { > if (!error) > { > // ------> Use message passing here <------ > new_connection->socket().io_service().post( > boost::bind(&tcp_connection::start, new_connection)); > > start_accept(); > } > } Chris in one of your replies I get to know that to achieve the above one can use a pool of io service object. Could you explain a bit about this? What is this io service::work object. How I can use thread pool in achieving the above? What should I have in my worker object structure of the thread pool? Regards Gaurav DISCLAIMER: This message contains privileged and confidential information and is intended only for an individual named. If you are not the intended recipient, you should not disseminate, distribute, store, print, copy or deliver this message. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete or contain viruses. The sender, therefore, does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. If verification is required, please request a hard-copy version.

2 1

boost::ublas bindings ? (eigenvalues)
by Philippe Vaucher 03 May '07

03 May '07

Hello, I'm looking for the boost::ublas bindings but I can't find them on the CVS or anywhere. Do you guys know where they are ? My goal is to compute eigenvalues from a matrix like the eig() function in matlab. The big picture is to implement the roots finding algorithm which uses eigenvalues... Thank you. Philippe

3 3

[boost::proto] bug with large (> 8) values for BOOST_PROTO_MAX_ARITY
by Maurizio Vitale 03 May '07

03 May '07

The following piece of code compiles fine: #define BOOST_PROTO_MAX_ARITY 8 #include <boost/xpressive/proto/proto.hpp> while the following gives errors #define BOOST_PROTO_MAX_ARITY 9 #include <boost/xpressive/proto/proto.hpp> and so on for any value of BOOST_PROTO_MAX_ARITY larger than 8. If there's a real problem with more than eight, it would be good to have an #error statement in that case. I'm really interested in having patterns with those many arguments, so once the variable controlling the maximum arity and the one controlling the maximum number of subpatterns in a pattern get decoupled I may be fine, but still giving a clear error message would be helpful. I only need BOOST_PROTO_MAX_ARITY=8. I tried 9 just because I was getting ambiguous conversions, which in the past were due to this. Best regards, Maurizio

2 11