February 2007 - Boost-users - lists.preview.boost.org

Receiving a bad_weak_ptr exceptions when using shared_from_this()
by Stephen Torri 06 Feb '07

06 Feb '07

Using the enable_share_from_this template I am receiving a bad_weak_ptr exception when calling shared_from_this(). What are the common reason for receiving such an exception? Stephen

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FW: Linker errors when using regex Lib with MSVC8 and STLPort 5.1.0 and Boost 1_33_1
by Manish Mangal 06 Feb '07

06 Feb '07

Hi I have built the StlPort 5.1.0 shared dlls and boost 1_33_1 Shared dlls successfully. The Platform is MSVC8. I created a sample projeth with just on file with code: #include <boost/regex.hpp> bool testregex( const char* StringToMatch ) { return( boost::regex_match( StringToMatch, boost::regex("[A-Z]+") )); } int main (int argc, char *argv[]) { bool trial = testregex( "hello how r u ?"); return 1; } Compilation succeeds but I get two Linker errors (BOOST_DYN_LINK is defined) Main.obj : error LNK2001: unresolved external symbol "public: bool __thiscall boost::re_detail::perl_matcher<char const *,class stlp_std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::match(void)" (?match@?$perl_matcher@PBDV?$allocator@U?$sub_match@PBD@boost@@@stlp_std @@U?$regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost @@QAE_NXZ) 1>Main.obj : error LNK2001: unresolved external symbol "public: __thiscall boost::re_detail::perl_matcher<char const *,class stlp_std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >::perl_matcher<char const *,class stlp_std::allocator<struct boost::sub_match<char const *> >,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const *,char const *,class boost::match_results<char const *,class stlp_std::allocator<struct boost::sub_match<char const *> > > &,class boost::basic_regex<char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> > > const &,enum boost::regex_constants::_match_flags,char const *)" (??0?$perl_matcher@PBDV?$allocator@U?$sub_match@PBD@boost@@@stlp_std@@U? $regex_traits@DV?$w32_regex_traits@D@boost@@@boost@@@re_detail@boost@@QA E@PBD0AAV?$match_results@PBDV?$allocator@U?$sub_match@PBD@boost@@@stlp_s td@@@2@ABV?$basic_regex@DU?$regex_traits@DV?$w32_regex_traits@D@boost@@@ boost@@@2@W4_match_flags@regex_constants@2@0@Z) So it cannot find the constructor for perl_matcher and the declaration for regex_match. I found a similar post on Boost : http://www.nabble.com/-regex-Using-regex-in-x64-exe-with-VC-8.0-t2088061 .html#a5755051 The suggested solutions on this post are: 1) check for intermixing of x86 and x64 : I am on 32 bit platform.. so intermixing does not apply 2) add regex source code and compile ( using BOOST_REGEX_NO_LIB) : I get the errors for stdext namespace 1>C:\boost_1_33_1\boost/regex/v4/regex_workaround.hpp(145) : error C2653: 'stdext' : is not a class or namespace name 1> C:\boost_1_33_1\boost/regex/v4/regex_format.hpp(562) : see reference to function template instantiation 'OutputIterator boost::re_detail::copy<const charT*,OutputIterator>(InputIterator,InputIterator,OutputIterator)' being compiled 1> with 1> [ 1> OutputIterator=boost::re_detail::string_out_iterator<stlp_std::basic_str ing<wchar_t,stlp_std::char_traits<wchar_t>,stlp_std::allocator<wchar_t>> >, 1> charT=wchar_t, 1> InputIterator=const wchar_t * 1> ] 1> C:\boost_1_33_1\boost/regex/v4/match_results.hpp(160) : see reference to function template instantiation 'OutputIterator boost::re_detail::regex_format_imp<boost::re_detail::string_out_iterator <S>,const wchar_t*,stlp_std::allocator<_Tp>,_CharT,boost::re_detail::trivial_forma t_traits<charT>>(OutputIterator,const boost::match_results<BidiIterator> &,const charT *,const charT *,boost::regex_constants::match_flag_type,const traits &)' being compiled 1> with 1> [ 1> OutputIterator=boost::re_detail::string_out_iterator<stlp_std::basic_str ing<wchar_t,stlp_std::char_traits<wchar_t>,stlp_std::allocator<wchar_t>> >, 1> S=stlp_std::basic_string<wchar_t,stlp_std::char_traits<wchar_t>,stlp_std ::allocator<wchar_t>>, 1> _Tp=boost::sub_match<const wchar_t *>, 1> _CharT=wchar_t, 1> charT=wchar_t, 1> BidiIterator=const wchar_t *, 1> traits=boost::re_detail::trivial_format_traits<wchar_t> 1> ] 1> C:\boost_1_33_1\boost/regex/v4/match_results.hpp(156) : while compiling class template member function 'stlp_std::basic_string<_CharT,_Traits,_Alloc> boost::match_results<BidiIterator>::format(const stlp_std::basic_string<_CharT,_Traits,_Alloc> &,boost::regex_constants::match_flag_type) const' 1> with 1> [ 1> _CharT=wchar_t, 1> _Traits=stlp_std::char_traits<wchar_t>, 1> _Alloc=stlp_std::allocator<wchar_t>, 1> BidiIterator=const wchar_t * 1> ] 1> C:\boost_1_33_1\boost/regex/v4/instances.hpp(86) : see reference to class template instantiation 'boost::match_results<BidiIterator>' being compiled 1> with 1> [ 1> BidiIterator=const wchar_t * 1> ] 1>C:\boost_1_33_1\boost/regex/v4/regex_workaround.hpp(145) : error C3861: 'unchecked_copy': identifier not found Can anyone suggest a solution?? Thanks in advance Manish Mangal Software Engineer atlas(r) search Partner for Results 206-816-8349 // phone Manish.Mangal(a)AtlasSolutions.com <mailto:t-Matt.Koch@AtlasSolutions.com> // email www.AtlasSolutions.com <outbind://116-000000001368D4B5F8F6D0488191444C76FD7C9507008921F4CB773B0 545AAED425DEF553BC300003A3500100000DB0C51F64BED3447AA6EC585072C4EC300000 1E3B7A70000/jenniferh/Local%20Settings/Temporary%20Internet%20Files/OLK3 /www.AtlasSolutions.com> // web

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help needed building boost_1_34 with v2
by David P. Riedel 06 Feb '07

06 Feb '07

Hi I have checked out the latest boost_1_34 RC from svn and am trying to build it for the first time. For various reasons, I have both gcc and Python in 'non-standard' locations on my linux box. For the v1 build system, I used the following command to build the libraries bjam -a --without-wave --without-test --prefix=/usr/local/boost-1.34.0_gcc-4.1.1 --includedir=/usr/local/boost-1.34.0_gcc-4.1.1 "-sTOOLS=gcc" "-sGCC_ROOT_DIRECTORY=/usr/local/gcc-4.1.1" "-sPYTHON_ROOT=/usr/local/python-2.4.4_gcc-4.1.1" "-sPYTHON_VERSION=2.4" stage This doesn't work with v2 build. The getting started help page still seems to have the v1 related information. So my question is: what would be the v2 bjam that corresponds to the v1 version above? Thanks for any help. Dave Riedel

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Linking issues with regex library on redhat
by Jojy Varghese 06 Feb '07

06 Feb '07

Hi all, I am a new user of boost library. I am having trouble trying to link the boost regex library. The applications craps out giving an error message like undefined symbol: _ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE9 do_assignEPKcS7_j I have all the regex .so files in my LD_LIBRARY_PATH. Am I missing something? thanks in advance for the help, Jojy

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[statechart] : asynchronous_state_machine - access member functions
by Oliver.Kowalke＠qimonda.com 06 Feb '07

06 Feb '07

Hello, Is it possible to access public member functions of an asynchronous_state_machine (for instance bool terminated() ) from processor_handle (fifo_scheduler<>::create_processor() returns as processor_handle)? Regards, Oliver

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Regex failure
by Bob Kline 06 Feb '07

06 Feb '07

We have encountered a problem in the regex++ package, which reports having exhausted memory after examining a very short string with a regular expression of only modest complexity. I realize that the documentation for the package does not specify how much memory usage is too much, but since the same combination of regular expression and test string works without problems with a number of other programming toolsets (e.g., Python, Perl, C#) I'm guessing that the maintainers of the package would be interested in tracking down the problem (I would if it were my software). Here's a repro case which boils the problem down to the tiniest example: #include <boost/regex.hpp> int main() { boost::wregex e(L"^[^\\s]( ?([^\\s]+ ?)*[^\\s])?$"); boost::wcmatch m; boost::regex_match(L"codeine phosphate ", m, e); return 0; } I have confirmed that the behavior is present in the most recent version of the Boost code by retrieving and building the latest set of sources from CVS this morning. (I understand the usefulness of having the user perform this check, but making this a requirement, as the web instructions for submitting bug reports do, may be eliminating a substantial number of valuable reports; it took a number of attempts, with the connection to the CVS server hanging several times, before I could even get to the very lengthy build step.) The failure is not triggered if a version of regex_match is used which does not take the match_results argument, but then of course we don't get access to the match results. I'm pretty sure that the expression is boiled down to the least ambiguous form (without changing the semantics). In plain English, it's looking for strings that have no leading or trailing whitespace, and for which any internal whitespace runs are comprised solely of a single blank character. Doesn't seem like a very esoteric pattern. We have reproduced the behavior on Linux and on Windows. Hope this is useful. Feel free to contact me if you need any further information. Bob Kline

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Boost.Thread contained within a class?
by Joshua ChaitinPollak 06 Feb '07

06 Feb '07

Hello, I have a question about Boost.Thread. I am trying to create a class which upon instantiation creates a thread based upon itself, and then on destruction, stops the thread and cleans up after itself. A simple example is below. Is this possible, and if not, what alternatives do I have? The reason for this is to create a single external API (actually defined in a base class), and still have a background thread (hidden from the API) which can share that object's internal member variables. I'm looking to do something like this: class my_handler { public: boost::thread* background_thread; my_hander() : background_thread(NULL) { background_thread(*this); } ~my_hander() { if (background_thread != NULL) { running = false; background_thread.join(); } operator()() { while(running) { // do something } } }; -Thanks, Josh -- Joshua ChaitinPollak Software Engineer Kiva Systems

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When using singleton, I get "undefined symbol: _ZN9Singleton8just_oneE" error message
by Jin Sun 06 Feb '07

06 Feb '07

I am learning boost python. I have the following code: //test.cpp------------------------------------------------------------------ ----------------------------- #include <boost/python/module.hpp> #include <boost/python/class.hpp> #include <boost/python/def.hpp> #include <boost/python/reference_existing_object.hpp> #include <boost/python/return_value_policy.hpp> #include <utility> // classes to wrap class Singleton { public: static Singleton* get_it() {return &just_one;} private: Singleton() : x(0) {} public: int exchange(int n) // set x and return the old value { std::swap(n, x); return n; } private: int x; static Singleton just_one; }; // Wrapper code using namespace boost::python; BOOST_PYTHON_MODULE(singleton) { class_<Singleton, boost::noncopyable>("Singleton", no_init) .def("get_it", &Singleton::get_it, return_value_policy<reference_existing_object>()).staticmethod("get_it") .def("exchange", &Singleton::exchange) ; } //-------------------------------------------------------------------------- ------------------------------------------------ My Jamfile is as following: //-------------------------------------------------------------------------- ------------------------------------------------ # This is the top of our own project tree project-root ; # Include definitions needed for Python modules import python ; extension singleton # Declare a Python extension called hello : hello.cpp # source # requirements and dependencies for Boost.Python extensions <template>@boost/libs/python/build/extension ; //-------------------------------------------------------------------------- ---------------------------------------------- When I run it, I get the following error message: Python 2.5 (r25:51908, Jan 30 2007, 15:03:58) [GCC 4.0.2 20051125 (Red Hat 4.0.2-8)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import singleton Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: ./singleton.so: undefined symbol: _ZN9Singleton8just_oneE >>> Can anyone help me? Thanks!!! Jin Sun --------------------------------------------------------- Rekhi Hall 301 1400 Townsend Dr. Houghton MI, 49931 USA Phone: 906-370-2261 ---------------------------------------------------------

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[date_time] Set date/time/timezone?
by Pau Garcia i Quiles 06 Feb '07

06 Feb '07

Hello, Boost::Date_Time is great to get and manipulate time and date but, is it possible to *set* those values? What I would like to do is read a string/struct/container/whatever which contains a date, time and timezone and set those values as the system time, system date and system timezone (something like the SetSystemTime SetSystemTimeZoneInformation methods in Win32). Thank you. -- Pau Garcia i Quiles http://www.elpauer.org (Due to the amount of work, I usually need 10 days to answer)

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'boost::any::holder<ValueType>' : assignment operator could not be generated
by Magnus Therning 06 Feb '07

06 Feb '07

I've just installed the pre-built Boost libraries for Windows offered by boost-consulting.com. I started playing with program_options. I use the following options: options.add_options() ("help,h", "display this help message and exit") ("version,v", "output version information and exit") ("silly,s", po::value<int>(), "silly option") ; When compiling that code with Visual Studio 8.0 I get warnings about - 'boost::program_options::options_description' : assignment operator could not be generated - 'boost::any::holder<ValueType>' : assignment operator could not be generated The latter one seems to be the cause for a linking error: - unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > boost::program_options::arg" g++ works just fine, no warnings, no link errors. Any suggestions on how to solve this? M

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