August 2008 - Boost-users - lists.preview.boost.org

[boost:regex]does boost:regex support char set substraction?
by gj_uestc 11 Aug '08

11 Aug '08

Hi all, I got another problem here while trying using boost:regex: does boost:regex support char set substraction? For example:I give boost:regex an expression"[a-z]-[d-f]".I would like the boost take the second "-" as and substracion. So this expression is supposed to be translated as "[a-c]|[f-z]".I am wonderring whether boost:regex has such substraction symbols? Thanks && Regards Juan

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[python|1.36_beta] Why am I forced to define BOOST_PYTHON_STATIC_LIB?
by Markus Werle 11 Aug '08

11 Aug '08

Hi! I am using VS2005SP1, compiling debug version with MFC in a static lib. No problem for boost libs to auto-select the correct (static) libraries all the time. Enters Boost.Python which deliberately chooses to ignore my compiler settings and to set BOOST_PYTHON_DYNAMIC_LIB and then later at boost\python\detail\config.hpp, line 128: #ifdef BOOST_PYTHON_DYNAMIC_LIB # define BOOST_DYN_LINK // <---- BOOM! #endif which obviously is properly catched in auto_link.hpp, line 292 Everything works as expected if I define BOOST_PYTHON_STATIC_LIB, but I do not understand why I have to take that extra effort. All other boost libs play together with my the compiler settings ... Am I missing something? Markus

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[Boost.asio] Second multicast async_send_to returns 10009
by John Urberg 11 Aug '08

11 Aug '08

I'm using boost asio to send out multicast hailing messages every 15 seconds from an ActiveX control using boost 1.35.0 and VC9. I had a proof of concept ActiveX working fine, but in my production ActiveX, I'm able to send the first message successfully, but every subsequent message returns a 10009 error. Here is the code: MulticastServer::MulticastServer( boost::asio::io_service& io_service, string addr, int port, int seconds) : endpoint(boost::asio::ip::address::from_string(addr), port) , socket(io_service, endpoint.protocol()) , timer(io_service) , server_port(server_port) , seconds(seconds) { socket.set_option(boost::asio::ip::multicast::hops(32)); } void MulticastServer::HandleTimeout(const boost::system::error_code& error) { string message = BuildHailMessage(); std::strcpy(buffer, message.c_str()); socket.async_send_to( boost::asio::buffer(buffer, message.length()), endpoint, boost::bind( &MulticastServer::HandleSendTo, this, boost::asio::placeholders::error)); } void MulticastServer::HandleSendTo(const boost::system::error_code& error) { timer.expires_from_now(boost::posix_time::seconds(seconds)); timer.async_wait(boost::bind(&MulticastServer::HandleTimeout, this, boost::asio::placeholders::error)); } Any ideas what would cause this error message? Also, if I use a string instead of char[] for the buffer, I always receive a 'string iterator not dereferencable' assertion failure. How could I fix that so I can use std::string instead of a char[] buffer? Thanks, John

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Newbie
by Craig Petty 11 Aug '08

11 Aug '08

What headers are the sockets in boost?Hope someone i can help me.:) Craig

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[python] a lot of hassle getting started with embedding and vc8
by Markus Werle 11 Aug '08

11 Aug '08

Hi folks! Probably someone with some hints on how to fix this. I may have overlooked portions of the doc ... Status: boost_1_36_beta installed using bjam for vc8/SP1 against python-2.5.2; python test suite shows no failure. Trying to embed boost::python/Python in a Visual Studio 2008 project: I managed to compile some code in debug mode (linking to python25.lib release mode). The embedded python interpreter (using the precompiled version of python-2.5.2) throws an exception even on statements like "a=2", having "error_already_set", but PyErr_Print(); does not show a message, neither in Debugger nor after calling the executable from the command line. This is odd. So it is time for a debug session - which is where true trouble begins: fetch python source code, compile with vc8 in order to create python25_d.lib and friends. Now what I really want is a *debug* executable with *statically* linked python and boost_python, so I tell it to the boost library by defining BOOST_DEBUG_PYTHON and BOOST_PYTHON_STATIC_LIB. Defining BOOST_PYTHON_STATIC_LIB is necessary to have auto linker link to the static boost_python libs (libboost_python-vc80-mt-sgd.lib) [see http://thread.gmane.org/gmane.comp.lib.boost.user/38461/focus=38600] but has a nasty side effect: Now the compiler decides python_25.lib has to be linked to rather than python25_w.lib. OUCH! I digged into all headers (also using find/grep) to figure out why boost::python now thinks that python25.lib has to be linked into the executable, but could not find the autolinker part for python*.lib. The key part is in boost/python/detail/config.hpp, line 68 // backwards compatibility: #ifdef BOOST_PYTHON_STATIC_LIB # define BOOST_PYTHON_STATIC_LINK # elif !defined(BOOST_PYTHON_DYNAMIC_LIB) # define BOOST_PYTHON_DYNAMIC_LIB #endif I feel uncomfortable about the "backwards compatibility" tag in the comment. So there must be some other way to get around this mess. It all comes down to hinder BOOST_PYTHON_DYNAMIC_LIB to be defined. Looking at [BINARY_DIST]python-2.5.2\include\pyconfig.h - a hand-written version of the python config stuff, there might be some issue with with the "pragma comment(lib" portion ... ================================================== OK, let us revert to dynamic linking then: Using the code from example/quickstart/embedding.cpp I get a <cite> Unhandled exception at 0x00000000 in TestBoostPythonEmbedding.exe: 0xC0000005: Access violation reading location 0x00000000. </cite> triggered by python::object main = python::import("__main__"); calling (*) python::handle<> module(PyImport_ImportModule(n)); // BOOM! but calling PyImport_ImportModule("__main__"); directly succeeds. but stepping into PyImport_ImportModule(n) fails. What's wrong with (*) ? The same game runs without error (!!!!) in release mode. To be honest: I am lost. Any help or hint appreciated. Markus

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[boost.regex]Does boost:u32regex recognize the unicode named blocks like "\p{IsBasicLatin}"?
by gj_uestc 11 Aug '08

11 Aug '08

Hi,all Nowadays I am using boost:u32regex to do some regular expression processing.But it seems that "/p{IsBasicLatin}"is not a accessable expression by boost::make_u32regex(tmp).Does boost:regex not suppor the named unicode blocks or I have to pass some other flags to the library? Now I was using the defult flag wich indicate using perl syntactic. thanks&regards Juan

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[ANN] Boost.Proto committed to trunk
by Eric Niebler 11 Aug '08

11 Aug '08

I've just committed Boost.Proto v4 to trunk (http://svn.boost.org/trac/boost/changeset/48079) This version is represents a significant reworking from the version that was reviewed and accepted back in April. Although the code is quite stable now, I have not yet integrated all the feedback about the documentation. It is my intention to bring the docs up to Boost standards in time to get Proto into 1.37. I am leaving the old version of Proto at boost/xpressive/proto for the time being, since some other projects (Xpressive, Spirit2 Qi and Karma) are relying on it. It will be removed at the earliest opportunity. I've also updated the proto.zip archive in the Boost file vault and uploaded the latest docs to: http://boost-sandbox.sourceforge.net/libs/proto/doc/html/index.html Thanks, -- Eric Niebler BoostPro Computing http://www.boostpro.com

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[Serialization] Serialization of a derived template class inheriting from a none template base
by Sebastian.Karlsson＠mmorpgs.org 10 Aug '08

10 Aug '08

Hi, I'm in the process of trying to get boost::any serializable, and it's quite tricky, especially considered my very limited experience with boost::serialize. I googled around and found an old discussion on this very list, and while interesting no resolution seemed to be found which satisfied all the criteria for being commited boost. However, since I'm not as picky with data portability, the solution hinted at in: http://lists.boost.org/boost-users/2005/09/14266.php seems very interesting. The only problem is that I can't see how it would be implemented to solve this problem. It needs to be within the definition of the class to be able for the typename to be in scoop, but since the macro seems to expand to a definition to be placed in the boost namespace I can't seem to get it to play nice. Any solution which lets me automagicaly serialize boost::any which contains serializable types, even if intrusive, would be extremely welcomed.

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warning in bind header
by Isaac Lascasas 10 Aug '08

10 Aug '08

Hello, this is my first post to the Boost Users List. First, I want to present my respect to all the boost lib developers. I have been using boost lib for about two years and it has improved the quality and robustness of my code to points I would have never imagined. Thank you very much. I'm posting this message because I get the following warning in the bind.hpp header from the current trunk with the vc++2008 compiler: c:\code\BoostSVN\boost/bind.hpp(1643) : warning C4180: qualifier applied to function type has no meaning; ignored c:\code\BoostSVN\boost/bind.hpp(1677) : see reference to class template instantiation 'boost::_bi::add_cref<Pm,I>' being compiled with [ Pm=sl::math::vector4<float> (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), I=1 ] c:\code\sl\pipe_smasher\pipes/build.hpp(106) : see reference to class template instantiation 'boost::_bi::dm_result<Pm,A1>' being compiled with [ Pm=sl::math::vector4f (__cdecl sl::pipe_smasher::pipes::build_float4::* )(void), A1=sl::pipe_smasher::pipes::build_float4 * ] My code looks like this: class build_float4 : public pipe { public: build_float4() { m_pOutput = add_output<vector4f>("Output"); m_pInputX = add_input<float>("x"); m_pInputY = add_input<float>("y"); m_pInputZ = add_input<float>("z"); m_pInputW = add_input<float>("w"); m_pOutput->add_dependency(boost::bind(&build_float4::on_input_change, this), m_pInputX, m_pInputY, m_pInputZ, m_pInputW); } vector4f on_input_change() { return vector4f(**m_pInputX, **m_pInputY, **m_pInputZ, **m_pInputW); } private: output<vector4f>* m_pOutput; input<float>* m_pInputX; input<float>* m_pInputY; input<float>* m_pInputZ; input<float>* m_pInputW; }; Checking the bind.hpp I found the following: template< class M, class T > struct add_cref< M T::*, 1 > { typedef M const & type; }; Maybe I'm doing something wrong or it is just a typo in the bind.hpp? Thank you, Isaac Lascasas

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[multi-array] Performance? Difference from GIL or uBLAS?
by John C. Femiani 09 Aug '08

09 Aug '08

Has anybody measured performance of multi-array? I am considering whether or not to use it, but when I googled multi_array I got a very old, but unresolved, discussion about poor performance measurements in experiments with optimized code that uses multi_array. (http://lists.boost.org/boost-users/2003/07/4423.php) Also, after a rough glance through multi_array and uBLAS it looks like GIL, uBLAS, and multi_array seem to repeat very similar concepts (and seem to use different syntax). Isn't that kind of bad? I have been playing with GIL in the past but now I am scratching my head about these other libraries. -- John

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