June 2006 - Boost-users - lists.boost.org

bjam under cygwin/XP
by Janos Vegh 13 Jun '06

13 Jun '06

Hi, I am trying to use bjam, through building a 'hello' project. However, I receive the following: $ bjam Unable to load Boost.Build: could not find build system. --------------------------------------------------------- C:\cygwin\home\Veghj\projects\hello\boost-build.jam attempted to load the build system by invoking 'boost-build /cygdrive/c/veghj/projects/boost_1_33_1/tools/build/v2 ;' but we were unable to find "bootstrap.jam" in the specified directory or in BOOST_BUILD_PATH (searching /cygdrive/c/veghj/projects/boost_1_33_1/tools/ build/v2). Please consult the documentation at 'http://www.boost.org'. At the same time, the requested file is apparently there: $ ls /cygdrive/c/veghj/projects/boost_1_33_1/tools/build/v2 boost-build.jam example release_procedure.txt boost.css generators_prototype.py roll.sh bootstrap.jam hacking.txt site-config.jam build index.html test build-system.jam kernel tools changes.txt nightly.sh user-config.jam debian notes util doc options What do I wrong? Thanks for any help Janos

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Linking with the appropriate library component
by Umut TABAK 13 Jun '06

13 Jun '06

Dear all, I have tried to install boost by the packages that are supplied as a part of Cygwin which kept me doing a lot of work. Anyway, to test the library(lexical_cast) I have a very simple code, for the moment I can compile the file and the .o file is succesfully written, but in the link process I could not figure out which library and/or options I have to use. I have the obj file but can not produce an exe file. I used g++ -c -I"C:\cygwin\usr\local\include\boost-1_33_1\boost" filename.cc and filename.o is in the directory. Can somebody share his/her ideas with me. Best regards, Umut

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Compilers supported by a given library
by Edward Diener 13 Jun '06

13 Jun '06

Is there any central place in the Boost documentation which tells, for any given release, or even just for the latest release, which compilers are supported by a given library ? I ask this because attempting to build a particular library in Boost 1.33.1 for a particular compiler failed, and I could see no place where I could determine whether that Boost library was actually meant to support the particular compiler or not in the 1.33.1 implementation.

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[BGL] Betweenness Centrality Clustering
by Rui Carvalho 12 Jun '06

12 Jun '06

Hello, I'm trying to implement the algorithm in the paper below and I'd like to know if I need to do it myself, or whether it has been implemented as part of the BGL as 'Betweenness Centrality Clustering'. Could someone help, please. I just don't want to reinvent the wheel. Cheers, Rui > -----Original Message----- > From: Rui Carvalho [mailto:rui.carvalho@ucl.ac.uk] > Sent: 07 June 2006 23:48 > To: 'boost-users(a)lists.boost.org' > Subject: [BGL] Betweenness Centrality Clustering > > Hi, > > Is the BGL betweenness centrality clustering algorithm an implementation of: > > Community structure in social and biological networks > M. Girvan and M. E. J. Newman > Proc. Natl. Acad. Sci. USA 99, 7821-7826 (2002). > http://aps.arxiv.org/PS_cache/cond-mat/pdf/0112/0112110.pdf > > thanks, > Rui

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gzseek equivalent in boost::iostreams with bzip2/gzip?
by Hin-Tak Leung 12 Jun '06

12 Jun '06

What I would like to do is to skip over part of a gzip'ed input, in a manner similiar to calling gzseek() in C, but I don't seem to be able to do that. Since it is possible to do it in C (somewhat slowly and there is no bzseek), I was thinking of something similiar to: namespace boost_io = boost::iostreams; boost_io::filtering_istream *instr = new boost_io::filtering_istream(); /* one of these two */ //instr->push(boost_io::gzip_decompressor()); instr->push(boost_io::bzip2_decompressor()); instr->push(boost_io::file_source(m_FileName.c_str(), std::ios::in | std::ios::binary)); // skip the header //instr->seekg(boost_io::offset_to_position(m_iHeaderBytes), std::ios_base::beg); instr->seekg(boost_io::offset_to_position(m_iHeaderBytes)); int32_t datasize = BUFFER_ZIZE; m_lpData = new char[datasize]; std::cout << "position before:\t " << instr->tellg() << std::endl; instr->read(m_lpData, datasize); std::cout << "position after:\t " << instr->tellg() << std::endl; But I tellg() returns 0 and datasize without the push::decompressor, and -1/-1 when the decompressor is pushed. Am I doing something wrong? I know streams aren't really seekable, but I was hoping that there is a poorman's seek (like gzseek - which is essentially read and throw-away) that's implementable. The incentive - is to have transparent decompression of input in some legacy code - I don't really want to modify every read to gzread, or bzread, for example... Thanks a lot. Hin-Tak Leung Send instant messages to your online friends http://uk.messenger.yahoo.com

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Re: [Boost-users] [boost.multi_array] Best use of memory
by Sohail Somani 12 Jun '06

12 Jun '06

Well if its contiguous, that's your problem. Likely it just can't allocate that much contiguous memory. > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Ronald Garcia > Sent: Monday, June 12, 2006 11:02 AM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] [boost.multi_array] Best use of memory > > > Hello Sebastien, > > Ideally, you should be able to work with an array of doubles, > rather than an array of pointers to double. I can create an > multi_array with the dimensions you mention. > > To answer your questions, multi_array uses a standard library > allocator to allocate a contiguous block of memory in which > to hold the array data. I'm afraid I do not know why you > cannot exceed these limits. > > ron > > > > > I'm currently using multi_array to represent 3D > matrices of doubles, I > was wondering which would be the best use since the > array has to hold a > very large amount of data. I' currently testing whith a > multi_array of > 800x800x100 to hold double or pointers to double and I > have memory > problems. When I declare the multi_array whith pointers > to doubles I can > usually go up to 775x775x100 without problems but when > I try the same > thing with a multi_array of doubles I get a bad alloc > error. My real > needs for the moment are for a multi_array of > 800x600x57 but I will need > bigger storage capacity in the near future, what are > your sugesstions. > > Is the multi_array a pointer itself? > How is memory management handled? > How can go beyond these limits? > > > > > -- > Sébastien Fortier > > >

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problem with regex library
by Renjie Zhao 12 Jun '06

12 Jun '06

After downloading boost_1_33_1, I succeeded in building regex lib with both VC8 and GCC 3.4.2(mingw special) 1st: The following code, which is compiled ok using VC8 (cl a.cpp/I"F:\boost_1_33_1" /EHsc), gives out wrong answer. Well I think the answer is wrong. Do I misunderstand the regular expression? It says"no match" while it is supposed to match twice. 01234 and 56972. If I changes the regex expr to ".*", the code functions well and gives out: The (0) match is:01234abcd56972 //==================CODE================ #include <string> #include <boost\regex.hpp> #include <iostream> using namespace std; using namespace boost; regex expr("([0-9]+)"); const char *src = "01234abcd56972"; int main(int argc, char *argv[]) { cmatch m; if(regex_match(src, m, expr)) { for(int i = 0; i < m.size(); ++i) { string msg; msg.assign(m[i].first, m[i].second); cout<<"The ("<< i <<") match is:"<<msg<<endl; } } else { cout<<"no match"; } cout<<endl; return 0; } //=================CODE================== What is the problem? Checking the same target string "01234abcd56972" and pattern "([0-9]+)", I get the expected result. Why? 2nd: I got a lot of error messages when I tried to compile the same piece of code with GCC 3.4.2 (mingw-special) under windows 2003 and GCC 4.1.0-3 (shipped with Fedora Core 5) under Linux. The previous work using Boost::regex is to build the lib, under windows and linux, the work is done with no error. ------------------error message under windows:------------------------- F:\projects> g++ a.cpp -I"F:\boost_1_33_1" -o a.exe C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp/cccPaaaa.o(.text$_ZN5boost11regex_matchIPKcSa INS_9sub_matchIS2_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SA_RNS_ 13match_resultsISA_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_ flagsE[bool boost::regex_match<char const*, std::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(ch ar const*, char const*, boost::match_results<char const*, std::allocator<boost:: sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)] +0x9a):reg.cpp: undefined reference to `boost::re_detail::perl_matcher<char cons t*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, bo ost::cpp_regex_traits<char> > >::match()' C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp/cccPaaaa.o(.text$_ZN5boost9re_detail12perl_ma tcherIPKcSaINS_9sub_matchIS3_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC 1ES3_S3_RNS_13match_resultsIS3_S6_EERKNS_11basic_regexIcSA_EENS_15regex_constant s12_match_flagsES3_[boost::re_detail::perl_matcher<char const*, std::allocator<b oost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_trait s<char> > >::perl_matcher(char const*, char const*, boost::match_results<char co nst*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char , boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::reg ex_constants::_match_flags, char const*)]+0xec):reg.cpp: undefined reference to `boost::re_detail::perl_matcher<char const*, std::allocator<boost::sub_match<cha r const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::constr uct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_tra its<char> > > const&, boost::regex_constants::_match_flags)' C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp/cccPaaaa.o(.text$_ZN5boost11basic_regexIcNS_1 2regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<ch ar, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char con st*, char const*, unsigned int)]+0x22):reg.cpp: undefined reference to `boost::b asic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do _assign(char const*, char const*, unsigned int)' collect2: ld returned 1 exit status ------------------error message under Linux:------------------------- [root@FC5 project]g++ a.cpp -I"/usr/include" -o a.o /tmp/cczdwrqd.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)':reg.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x22)：undefined referrence to'boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)' /tmp/cczdwrqd.o: In function `boost::re_detail::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*)':reg.cpp:(.text._ZN5boost9re_detail12perl_matcherIPKcSaINS_9sub_matchIS3_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC1ES3_S3_RNS_13match_resultsIS3_S6_EERKNS_11basic_regexIcSA_EENS_15regex_constants12_match_flagsES3_[boost::re_detail::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, char const*)]+0xa5)：undefined reference to'boost::re_detail::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)' /tmp/cczdwrqd.o: In function `bool boost::regex_match<char const*, std::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)':reg.cpp:(.text._ZN5boost11regex_matchIPKcSaINS_9sub_matchIS2_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SA_RNS_13match_resultsISA_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsE[bool boost::regex_match<char const*, std::allocator<boost::sub_match<char const*> >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(char const*, char const*, boost::match_results<char const*, std::allocator<boost::sub_match<char const*> > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)]+0x46)：undefined reference to'boost::re_detail::perl_matcher<char const*, std::allocator<boost::sub_match<char const*> >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::match()' collect2: ld returns 1 Can some help me? Although I know the question above may seem stupid and easy to solve. //Thanks -- This is my Very Signature. Ha, pretty good?

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Green Hills Integrity and boost?
by Brian Neal 12 Jun '06

12 Jun '06

We have successfully used several boost libraries on our real-time embedded system that runs under one of the real-time Linux variants. We are going to continue the development of this program under the Green Hills Integrity environment (it wasn't my decision ;-) ). Has anyone used boost under this environment before? I understand they have their own C++ compiler which uses the EDG front end, and their OS calls have POSIX interfaces, but that's all I really know. Thanks for sharing any experiences.

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Re: [Boost-users] mpl::accumulate
by Ovanes Markarian 12 Jun '06

12 Jun '06

Hello, can someone tell me what exactly a parameter State in the mpl::accumulate means. After the evaluation is finished, which type is returned by accumulate? State? Which types are passed to the binary ForwardOp? I do not exactly understand this example: typedef vector<long,float,short,double,float,long,long double> types; typedef accumulate< types , int_<0> , if_< is_float<_2>,next<_1>,_1 > >::type number_of_floats; With Kind Regards, Ovanes Markarian

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Re: [Boost-users] [asio] ASIO Questions
by Scott 12 Jun '06

12 Jun '06

> Try the boost devel mailing list > (gmane.comp.lib.boost.devel). ASIO questions there appear to > get answered very quickly. At some point I assume they will > be answered quickly here too. > > PS, I believe there are SSL tutorials for ASIO... but you > probably already knew that. :) Thanks for the info. On the contrary, if there are SSL tutorials for ASIO I have not been able to find them in the docs. The best I found were two undocumented files (client.cpp/server.cpp) that demonstrate creating an SSL connection with ASIO. But I have more questions than those 2 files can answer. I'll try the boost developers list. Thanks.

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