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Using boost::barrier
by Asheh 22 Feb '09

22 Feb '09

Hi, Having trouble with sleeping N threads while I need to wake them. Since boost contains no sleep/wake functionality I have tried using boost::condition, I have had trouble with this too (it seems to cause locks). Somone mentioned boost::barrier I read about it in the documentation and it appears to function in a way I would require, here is what im looking for: I reach a point in the program where I segment a pieces of data and it needs to be processed in parallel on two threads, the main thread waits for the two worker threads to finish processing then continues on, those two threads (or N threads..) must then go back to sleep until they are needed again. Can anyone provide a good solution, if boost::barrier is what im looking for could you help me describe how Id correctly impliment this? Thanks Ashley. -- View this message in context: http://www.nabble.com/Using-boost%3A%3Abarrier-tp22137821p22137821.html Sent from the Boost - Users mailing list archive at Nabble.com.

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Asio HTTP Server
by Christoph Schreiber 22 Feb '09

22 Feb '09

Hi! I'm looking for a smart way to read HTTP-Post data. Is request_handler::handle_request the right place to do this? Or should I better to use connection::handle_read? Any ideas (or even better, examples) anybody? I'm stuck. Regards, luky

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[gil] get raw data from picture
by Stephan Menzel 22 Feb '09

22 Feb '09

Hi there, is there any way to get the raw YCbCr data out of a gil Image that has been read with jpeg_read_image()? *_memory is private in image.hpp and I'm not sure what it contains anyway. Any ideas? Thanks... Stephan

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[GIL] wrapper for QImage
by Tomas Van Verrewegen 22 Feb '09

22 Feb '09

Hi, I'm planning to write an image manipulation application using Boost.GIL as a backbone and Qt for the interface. Now I was thinking it might be a good idea to write a wrapper around QImage to give GIL direct access to the pixels of a QImage. I've been looking at the code and as far as I can tell I have 2 options: (1) create a new GIL image type that wraps the QImage (2) create a "qimage_pixel_iterator" and use "... interleaved_view(...)" Now my question(s): - Would (2) be enough, or is it necessary to also create (1)? - "QRgb" (Qt's pixel type) is a typedef for "unsigned int", so specialising eg. "template<class Pixel> struct gil::channel_type" for "unsigned int" seems somewhat suboptimal (is it an 8bit RGBA pixel or a 32bit Gray pixel?). Some sort of proxy class might be appropriate? Maybe a gil::pixel<...> subclass?

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Regex win vs. linux
by Adam Kornafeld 22 Feb '09

22 Feb '09

Hi, I'm seeking help for the following problem, using the regex library: the following line of code is meant to assist in parsing urls: boost::regex exp("(?is)(https?)://([^:/?#]+):?(\\d{1,5})?/?([^?#]*)?\ \??([^#]+)?#?(\\w*)"); It runs fine in a linux environment, however if compiled with VC9 on windows, it fails with: First-chance exception at 0x7c812aeb in test.exe: Microsoft C++ exception: boost ::exception_detail ::clone_impl <boost::exception_detail::error_info_injector<boost::regex_error> > at memory location 0x0012f768.. I thought that the expression might be too long, and indeed if I shorten the above line to: boost regex exp("(?is)(https?)://([^:/?#]+):?(\\d{1,5})?/?"); it runs fine on windows as well. Any help on what the cause of this can be, would be appreciated. Regards, ==Adam

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Formatted reports and statistics charts for Boost Unit Test Framework
by Slava Imeshev 22 Feb '09

22 Feb '09

Hi All, I just wanted to let you know that now Parabuild is integrated with Boost Unit Test Framework. It provides formatted reports and statistics charts from test logs generated as a part of Continuous Integration or daily and nightly builds: http://www.viewtier.com/products/parabuild/boost_unit_test_framework.h tm Regards, Slava Imeshev

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[accumulators] help/advise required: Need a container to hold accumulator_set
by dhruva 22 Feb '09

22 Feb '09

Hello, I am writing a wrapper class which gets data over time and has to compute a variety of statistics using boost::accumulators. The accumulator cannot be a variable on the stack (function local variable) as it will go out of scope after the function invocation. I will have to make it a member variable of a class. I will not know the type of calculations to requested at compile time. I therefore need a generic accumulator type as member and add the specific type at runtime. In short, I need a container to hold accumulator_set objects. Different type of accumulator_set objects in the container will perform different calculations. The type of calculation I want to perform will be based on input at runtime. pseudo code: #define MEAN 1 #define MAX 2 class calc { public: setmetric(int metricType) { accumulator_set<double, features<> > *pacc; if (1 == metricType) { pacc = new accumulator_set<double, features <tag::mean> >; } else if(2 == metricType) { pacc = new accumulator_set<double, features <tag::max> >; } m_Vacc.push_back(pacc); } compute(double input) { // I will iterate over the vector, get the accumulator_set objects // acc_obj(input) followed by extract } private: std::vector <accumulator_set<double, features<> > *> m_Vacc; }; If features could be added at runtime, I probably could have solved this problem. Other approach is to have an accumulator_set with all supported features (supported by my application) as dropable. Drop all the unnecessary features based on user input. By adding all supported types, I will get a complete accumulator_set class at compile time and having a container to hold it is straight forward. Any help or advise is really appreciated. I may have raised a lot of basic questions but I am a boost newbie and taking a plunge. -dhruva Cricket on your mind? Visit the ultimate cricket website. Enter http://beta.cricket.yahoo.com

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boost::asio::read_until reads too much!
by Rob Currey 22 Feb '09

22 Feb '09

executing this code: boost::asio::streambuf b; std::cout << "socket.available()=" << socket.available() << std::endl; size_t received = boost::asio::read_until(socket, b, "\r\n"); std::cout << "received=" << received << std::endl; std::cout << "b.size()=" << b.size() << std::endl; std::istream is(&b); std::getline(is, m_token); results in output of: socket.available()=34 received=26 b.size()=34 In my app I need to read the 8 bytes (after the 26) as binary (and hence don't use the streambuf to do so). Yet read_until has already consumed them from the socket and placed them in the streambuf :( Suggestions?

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boost library advice wanted
by Sean Farrow 21 Feb '09

21 Feb '09

Hi: I am in the process of implementing a program that turned commands from voice recognition software in to code that are entered in to an application. there are approximately 200 codes available in this particular sofware I am automating. Wile I could use boost::stringAlgo along with the functions available in the stl there must be a better alternative. To give an idea of howthis would work the user might say: conditional new line, and [l] would be placed in the current document onscreen. the user could say skip 5 lines and [sk5] would be entered. >From this it is clar that: 1. some tokens are voiced by the user but are not needed when analysing the input. e.g lines is used for ease of use but not actually used in the analysis. 2. some tokens are only followed by certain othe tokens, e.g new can be followed by line, page or paragraph. tow queries: 1. What is the best boost library to use in this situation, boost.wav, boost.spirit, boost.xpressive or boost.tokenizer. 2. Has anybody else done anything like this, and hence can offer any implementation advice. Any help apreciated. Sean.

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[Question] Software documentation
by Mario Chacon 21 Feb '09

21 Feb '09

Hello: It's possible that some plugin or some another soft generate class diagram from the source?? I know that with oxygen can generate a beautiful HTML, but Can I do something more? Salud... masch...

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[serialization] newbie compilation question
by lenberman 21 Feb '09

21 Feb '09

I've got boost 1.38 built. When I try to build demo.cpp, it fails. I'm building in the serialization/examples subdirectory. I think this is a supported compiler. No doubt I'm doing something very stupid and hopefully very easy to fix. Thanks in advance. --Len make -k g++ --version g++ (Debian 4.3.2-1.1) 4.3.2 Copyright (C) 2008 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. g++ -g -I/share/space/net-srcs/boost_1_38_0 demo.cpp In file included from demo.cpp:16: /share/space/net-srcs/boost_1_38_0/boost/archive/tmpdir.hpp: In function ‘char* boost::archive::tmpdir()’: /share/space/net-srcs/boost_1_38_0/boost/archive/tmpdir.hpp:42: warning: deprecated conversion from string constant to ‘char*’ /tmp/ccezla7D.o: In function `boost::archive::text_iarchive& boost::serialization::smart_cast_impl::reference<boost::archive::text_iarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_iarchive>(boost::archive::detail::basic_iarchive&)': /share/space/net-srcs/boost_1_38_0/boost/serialization/smart_cast.hpp:78: undefined reference to `typeinfo for boost::archive::detail::basic_iarchive' /tmp/ccezla7D.o: In function `boost::archive::text_oarchive& boost::serialization::smart_cast_impl::reference<boost::archive::text_oarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_oarchive>(boost::archive::detail::basic_oarchive&)': /share/space/net-srcs/boost_1_38_0/boost/serialization/smart_cast.hpp:78: undefined reference to `typeinfo for boost::archive::detail::basic_oarchive' /tmp/ccezla7D.o: In function `~iserializer': /share/space/net-srcs/boost_1_38_0/boost/archive/detail/iserializer.hpp:141: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' /share/space/net-srcs/boost_1_38_0/boost/archive/detail/iserializer.hpp:141: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' ... more errors

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OT: generic template type from specific type?
by Neal Becker 21 Feb '09

21 Feb '09

Say I have: template<typename in_t> void F (in_t & in) ... main() { F<std::vector<int> > (...) Suppose in_t is a templated container, such as std::vector<int>. Is there a way within the function 'F' to get the generic container type, 'std::vector' when F is instantiated with a specific e.g., std::vector<int>? Maybe I'm missing something obvious :)

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[serialization][build][spirit][repost] Problems with spirit when building 1.38 serialization on windows with Intel C++ 11.0
by Jesse Perla 21 Feb '09

21 Feb '09

Sorry for the repost, but it looks like the formatting on my previous post was messed up, and I wouldn't blame people for not reading it I am on windows using the latest version of the intel compiler (set in my user-config.jam). I was able to do a debug build of everything using: bjam link=static debug stage But when I tried to do a release build, it is popping up a spirit error for serialization(fails with or without mpi). Any ideas on a workaround or if this is a legit bug? The main error in the build output is: C:\apps\boost\boost_1_38_0\boost\spirit\home\classic\utility\impl\chset\range_run.ipp(142) (col. 21): internal error: 0_1504 compilation aborted for libs\serialization\src\xml_grammar.cpp Full output: bjam --with-mpi link=static release stage ...patience... ...found 1080 targets... ...updating 4 targets... compile-c-c++ bin.v2\libs\serialization\build\intel-win\release\link-static\thre ading-multi\xml_grammar.obj icl: command line remark #10010: option '/Op' is deprecated and will be removed in a future release. See '/help deprecated' xml_grammar.cpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_rul e.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_ope rators.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_act ions.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_num erics.hpp C:\apps\boost\boost_1_38_0\boost\spirit\home\classic\utility\impl\chset\range_ru n.ipp(142) (col. 21): internal error: 0_1504 compilation aborted for libs\serialization\src\xml_grammar.cpp (code 4) call "C:\apps\Intel\Compiler\11.0\066\cpp\bin\ia32\iclvars_ia32.bat" > nul icl @"bin.v2\libs\serialization\build\intel-win\release\link-static\threading-mu lti\xml_grammar.obj.rsp" ...failed compile-c-c++ bin.v2\libs\serialization\build\intel-win\release\link-s tatic\threading-multi\xml_grammar.obj... ...skipped <pbin.v2\libs\serialization\build\intel-win\release\link-static\threa ding-multi>libboost_serialization-iw-mt-1_38.lib for lack of <pbin.v2\libs\seria lization\build\intel-win\release\link-static\threading-multi>xml_grammar.obj... ...skipped <pstage\lib>libboost_serialization-iw-mt-1_38.lib for lack of <pbin.v 2\libs\serialization\build\intel-win\release\link-static\threading-multi>libboos t_serialization-iw-mt-1_38.lib... ...skipped <pstage\lib>libboost_serialization-iw-mt.lib for lack of <pstage\lib> libboost_serialization-iw-mt-1_38.lib... ...failed updating 1 target... ...skipped 3 targets...

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[shared_ptr] Is reference counting thread safe in boost 1.38
by dhruva 21 Feb '09

21 Feb '09

Hello, I am trying to replace a home grown shared pointer which uses expensive lock (mutex) to make the increment and decrement thread safe. I went through the boost code and see it uses atomic operations. I am not able to figure out if the following case is handled: 1. Thread 1 has a shared_ptr and hence the reference is 1 2. Thread 1 is in the process of decrementing the reference and thread 2 is in the process of incrementing the the reference 3. If thread 1 succeeds in decrementing, the reference will become 0 and hence 'destroy' will get called. 4. Can thread 2 increment after when thread 1 is in a call to destroy? The reference count variable is itself protected but is the call to destroy and reference count variable synchronized? -dhruva Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/

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ambigous bitshift operator for ubig64_t ?
by Ákos Maróy 21 Feb '09

21 Feb '09

Hi, I'm trying to compile the following code: #include <boost/spirit/home/support/detail/integer/endian.hpp> boost::integer::ubig64_t big_endian_value; big_endian_value >> 1; but I get: error: ambiguous overload for 'operator>>' in 'big_endian_value >> 1' note: candidates are: operator>>(long long unsigned int, int) <built-in> ../../usr/include/boost-1_38/boost/spirit/home/support/detail/integer/cover_operators.hpp:53: note: long long unsigned int boost::integer::operator>>(const boost::integer::endian<big, long long unsigned int, 64u, unaligned>&, long long unsigned int) what am I doing wrong? (BTW, the same works with the >>= operator) I'm doing this on Linux, gcc 4.1.2 Akos

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Is it OK to post a brief announcement about reports and statistics for Boost Unit Test Framework?
by Slava Imeshev 21 Feb '09

21 Feb '09

Hi all, I am wondering if this is OK to post here a brief announcement about availability of formatted reports and statistics charts for Boost Unit Test Framework that we added to our product? Regards, Slava Imeshev

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boost::exception - leaking error_info
by Bruce Laing 21 Feb '09

21 Feb '09

This program seems to be leaking boost::exception::error_info objects. Is there something missing here? - Bruce typedef boost::error_info< struct tag_my_error, std::string > some_error_info; struct an_exception : public boost::exception, public std::exception {}; void throw_func() { BOOST_THROW_EXCEPTION ( an_exception() // no leak if next line is commented out. << some_error_info( std::string( "error message" ) ) ); } . . . BOOST_AUTO_TEST_CASE( test_exceptions ) { try { throw_func() } catch( an_exception& ) { } }

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boost_regex link problems
by Colin Hercus 21 Feb '09

21 Feb '09

Hi, I'm trying to use Boost regex for the first time and I'm having trouble getting libboost_regex to link. The libraries are in /usr/lib64 and I try adding -lboost_regex to CC command and also explicitly adding /usr/lib64/libboost_regex.so or .a but I keep getting the same linker errors whether the library is specified or not. I'm using Sun Studio 12. What am I doing wrong? Colin Running "/opt/sun/sunstudio12/bin/dmake -f Makefile CONF=Release" in /home/sparks/NovoCraft/ssp/novoalign dmake: defaulting to parallel mode. See the man page dmake(1) for more information on setting up the .dmakerc file. linuxpc --> 1 job /opt/sun/sunstudio12/bin/dmake -f nbproject/Makefile-Release.mk SUBPROJECTS= .build-conf linuxpc --> 1 job mkdir -p ../../sunbin CC -m64 -features=zla -staticlib=Cstd -staticlib=Crun --print-map >../../maps/novoalign.map -o ../../sunbin/novoalign build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/wmsearch.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/ksgroups.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/nawm.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/queryformat.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/queryfolder.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/keygen.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/ksindex.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/iubcodes.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/needle.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/TThread.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/shortnw.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/fragdist.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/novoparam.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/queryreader.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/posteriorP.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/qualconvert.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/TTimer.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/TThreadPool.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/rptsyncio.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/findamate.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/license.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/qryopt.o build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/novopaired_main.o /usr/lib64/libboost_regex.a -lpthread -lz /usr/lib64/libcrypto.a CC: Warning: Option --print-map passed to ld, if ld is invoked, ignored otherwise (/home/sparks/NovoCraft/ssp/novoalign)build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/wmsearch.o: . . .:(/home/sparks/NovoCraft/ssp/novoalign)build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/novopaired_main.o (/home/sparks/NovoCraft/ssp/novoalign)/usr/lib64/libboost_regex.a: :(/home/sparks/NovoCraft/ssp/novoalign)/usr/lib64/libboost_regex.a (/home/sparks/NovoCraft/ssp/novoalign)/usr/lib64/libcrypto.a: :(/home/sparks/NovoCraft/ssp/novoalign)/usr/lib64/libcrypto.a build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/ksgroups.o: In function `void boost::re_detail::basic_regex_parser<char,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::parse(const char*,const char*,unsigned)': ksgroups.cc:(.text%void boost::re_detail::basic_regex_parser<char,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::parse(const char*,const char*,unsigned)[void boost::re_detail::basic_regex_parser<char,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::parse(const char*,const char*,unsigned)]+0x28e): undefined reference to `void boost::re_detail::raw_storage::resize(unsigned long)' ksgroups.cc:(.text%void boost::re_detail::basic_regex_parser<char,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::parse(const char*,const char*,unsigned)[void boost::re_detail::basic_regex_parser<char,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::parse(const char*,const char*,unsigned)]+0x2f8): undefined reference to `void boost::re_detail::raw_storage::resize(unsigned long)' build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/ksgroups.o: In function `bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()': ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x17): undefined reference to `void*boost::re_detail::get_mem_block()' ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x128): undefined reference to `void boost::re_detail::verify_options(unsigned,boost::regex_constants::_match_flags)' ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x186): undefined reference to `void boost::re_detail::put_mem_block(void*)' ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x1a3): undefined reference to `void boost::re_detail::put_mem_block(void*)' ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x1ff): undefined reference to `void boost::re_detail::put_mem_block(void*)' ksgroups.cc:(.text%bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()[bool boost::re_detail::perl_matcher<const char*,std::allocator<boost::sub_match<const char*> >,boost::regex_traits<char,boost::cpp_regex_traits<char> > >::match()]+0x230): undefined reference to `void boost::re_detail::put_mem_block(void*)' build/Release/Sun12-Linux-x86/_ext/home/sparks/NovoCraft/ssp/novoalign/../../src/ksgroups.o: In function `boost::shared_ptr<boost::re_detail::cpp_regex_traits_implementation<char> >boost::object_cache<boost::re_detail::cpp_regex_traits_base<char>,boost::re_detail::cpp_regex_traits_implementation<char> >::do_get(const boost::re_detail::cpp_regex_traits_base<char>&,unsigned long)': ksgroups.cc:(.text%boost::shared_ptr<boost::re_detail::cpp_regex_traits_implementation<char> >boost::object_cache<boost::re_detail::cpp_regex_traits_base<char>,boost::re_detail::cpp_regex_traits_implementation<char> >::do_get(const boost::re_detail::cpp_regex_traits_base<char>&,unsigned long)[boost::shared_ptr<boost::re_detail::cpp_regex_traits_implementation<char>

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[Python] can't import boost modules in an embedded interpreter
by George Slavov 21 Feb '09

21 Feb '09

I solved my problem. I had to add the current directory (where the executable is) to sys.path at the beginning of the program before python files are picked up as modules in the embedded interpreter. George

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Conditional function definition with boost::enable_if
by Matthias Vallentin 20 Feb '09

20 Feb '09

Hi folks, I would like to define a function in a class only if a child defines it. In the below example, I would like the function f() to exist only in an object bar if it defines a function i(). So far, my approach with boost::enable_if failed because bar is not a complete type during examination. T is clearly incomplete at the time when b is defined. What would be the correct approach to solve this problem? #include <boost/type_traits/is_function.hpp> #include <boost/utility/enable_if.hpp> template <typename T> struct foo { typename boost::enable_if< typename boost::is_function<typename T::i>::type, void >::type f() { } }; struct bar : foo<bar> { void i() { } }; int main() { bar b; b.f(); // should only compile since bar defines i() return 0; } enable_if.cc: In instantiation of ‘foo<bar>’: enable_if.cc:16: instantiated from here enable_if.cc:10: error: invalid use of undefined type ‘struct bar’ enable_if.cc:16: error: forward declaration of ‘struct bar’ enable_if.cc: In function ‘int main()’: enable_if.cc:25: error: ‘struct bar’ has no member named ‘f’ Matthias -- Matthias Vallentin vallentin(a)icsi.berkeley.edu http://matthias.vallentin.cc

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Thread synchronization
by John D 20 Feb '09

20 Feb '09

Hello I have a situation in which hundreds of threads potentially run side by side. They exchange minimal data and are fully in sync by way of a scoped mutex. Now I have a situation in which a single seperate thread runs alongside all the worker threads. This thread is responsible for keeping data sets used by the workers, current. Given the complexity and total alternation of the data onthis interval, my question is; Does boost threads allow my single thread to halt all other activity ,of all the other threads,from a single thread itself. This is what I need to accomplish and any guidance to this matter is a huge help. John

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Formal Review: Boost.RangeEx
by Thorsten Ottosen 20 Feb '09

20 Feb '09

Dear Developers and Users, It's my pleasure to announce that the review of Neil Groves' RangeEx library starts today and lasts until March 3, 2009. What is it? +++++++++++ The library provide two very useful extensions to the range library 1. Range-based algorithms. E.g. boost::sort( rng ); which is a convenient wrapper of instead of std::sort( boost::begin(rng), boost::end(rng) ); But the new interface also allows for more expressive code because (on the fly) composition of algorithms suddenly is possible. 2. Range adaptors. E.g. std::vector<int> vec = ...; boost::copy( vec | boost::adaptors::reversed, std::ostream_iterator<int>( std::cout ) ); where the expression "vec | boost::adaptors::reversed" wraps the iterators of the range on the left in reverse iterators. The library provides a wide range (no pun intended) of Range adaptors, and they are a powerful way to create ranges on the fly and pass them to algorithms. Getting the library +++++++++++++++++++ The library may be downloaded from http://www.cs.aau.dk/~nesotto/boost/range_ex.zip or from the Boost vault under "Algorithms". The docs may be browsed online here http://www.cs.aau.dk/~nesotto/boost/libs/range/ Please note that the documentation is integrated with the current Range ilbrary. Therefore the relevant sections for the review is http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/adaptors.html and http://www.cs.aau.dk/~nesotto/boost/libs/range/doc/algorithms.html The code may be browsed here: http://www.cs.aau.dk/~nesotto/boost/boost/range/ Notice the library is header only (exception: the adaptor tokenized() depends on Boost.Regex). Writing a review ++++++++++++++++ If you feel this is an interesting library, then please submit your review to the developer list (preferably), or to the review manager. Here are some questions you might want to answer in your review: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick - reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Special considerations ++++++++++++++++++++++ Various RangeEx like libraries have been implemented in the past. You might want to compare with those libraries when you form your oppinion: 1. John Torjo's range lib http://rangelib.synesis.com.au/libs/boost-rangelib-20040913.zip http://torjo.com/rangelib/index.html 2. Adobe's ASL libraries include range-based algorithms: http://stlab.adobe.com/group__algorithm.html I'm looking forward to your review. best regards Thorsten, Review Manager

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[Q] storing function pointers to member function
by V S P 20 Feb '09

20 Feb '09

I am trying to come up with a system that would let me have a function (getter) for every member of the class Using macros I can generate a 'get_<membername> function such that struct my { float mem1; } would be struct my { float mem1; static const float& get_mem1( const my& ) { return my.mem1; } }; Now, I would like to store pointer to the get_mem1 function in a staticaly declared std::map Using boost/function.hpp I can declare a type for float typedef boost::function<const float& (const my& ,const char* )> tFget__float ; and then I can store it in, for example std::set<tFget__float> The problem is that if I have another function that returns a different data type (something other than float, for example std::string) I get a compilation error when trying to insert that function pointer into the set. There is a check implemented, I think, via the template system that prevents compiler from making copies of one ponter type to another -- even though they only differ by return type. When I just do the assignment tFget__float x= <function returning float> or to function returning std::string -- I do not get the error. So I would like to ask -- if there is a good way to store function pointers in a static array (I later on plan to iterate ove the set of function pointers and get the value of each data member into a stream ) thanks in advance, Vlad -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - The professional email service

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[serialization][build][spirit] Problems with spirit when building 1.38 serialization on windows with Intel C++ 11.0
by Jesse Perla 20 Feb '09

20 Feb '09

I am on windows using the latest version of the intel compiler (set in my user-config.jam). I was able to do a debug build of everything using: bjam link=static debug stage But when I tried to do a release build, it is popping up a spirit error for serialization. (fails with or without mpi) Any ideas on a workaround? See below: C:\apps\boost\boost_1_38_0>bjam --with-mpi link=static release stage ...patience... ...found 1080 targets... ...updating 4 targets... compile-c-c++ bin.v2\libs\serialization\build\intel-win\release\link-static\thre ading-multi\xml_grammar.obj icl: command line remark #10010: option '/Op' is deprecated and will be removed in a future release. See '/help deprecated' xml_grammar.cpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_rul e.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_ope rators.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_act ions.hpp Warning: This header is deprecated. Please use: boost/spirit/include/classic_num erics.hpp C:\apps\boost\boost_1_38_0\boost\spirit\home\classic\utility\impl\chset\range_ru n.ipp(142) (col. 21): internal error: 0_1504 compilation aborted for libs\serialization\src\xml_grammar.cpp (code 4) call "C:\apps\Intel\Compiler\11.0\066\cpp\bin\ia32\iclvars_ia32.bat" > nul icl @"bin.v2\libs\serialization\build\intel-win\release\link-static\threading-mu lti\xml_grammar.obj.rsp" ...failed compile-c-c++ bin.v2\libs\serialization\build\intel-win\release\link-s tatic\threading-multi\xml_grammar.obj... ...skipped <pbin.v2\libs\serialization\build\intel-win\release\link-static\threa ding-multi>libboost_serialization-iw-mt-1_38.lib for lack of <pbin.v2\libs\seria lization\build\intel-win\release\link-static\threading-multi>xml_grammar.obj... ...skipped <pstage\lib>libboost_serialization-iw-mt-1_38.lib for lack of <pbin.v 2\libs\serialization\build\intel-win\release\link-static\threading-multi>libboos t_serialization-iw-mt-1_38.lib... ...skipped <pstage\lib>libboost_serialization-iw-mt.lib for lack of <pstage\lib> libboost_serialization-iw-mt-1_38.lib... ...failed updating 1 target... ...skipped 3 targets...

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[Test] Compilation inconsistency
by Greg Ravikovich 19 Feb '09

19 Feb '09

Hello, I posted a question regarding the following issue a few months back: Empty cpp file containing only: #include <boost/test/test_case_template.hpp> Fails to compile, however an empty cpp file containing #include <boost/test/unit_test.hpp> #include <boost/test/test_case_template.hpp> Compiles fine. The issue is still there in boost 1.38. Can someone address it please? Thanks. Greg

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