- Boost-users - lists.boost.org

Adding a new file parsing library
by Dhaivat Pandya 20 Feb '11

20 Feb '11

Hello everyone. I've been using boost in my own projects for about 1 year now, and very often I've noticed that Boost does not have much file parsing support (I may be wrong as of now, please correct me). So, I was wondering if the community would be interested in a creation of a new library that uses the Boost::Filesystem set for cross platform file reading, and parses files for CSV, XML, HTML, etc. and tidies up the above if needed (much like the BeautifulSoup module for Python). Please tell me your views Dhaivat

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Re: [Boost-users] Boost::Asio on ARMV5TE
by Peter Meyer 20 Feb '11

20 Feb '11

Hi, after some debugging and testing i track down the problem to epoll. I don't known if it is a wrong usage by boost::asio or a bug inside the kernel. I've changed epoll_reactor.ipp with some debugging output and a memset. 226 void epoll_reactor::run(bool block, op_queue& ops) ... 239 epoll_event events[128]; 240+ ::memset(events, 0XEE, sizeof(events)); 241 int num_events = epoll_wait(epoll_fd_, events, 128, timeout); In case there are more events then one reported by epoll_wait, only the first epoll_event structure is filled with information. All following structures includes garbage or 0xEE set by memset befor calling epoll_wait. Debug output: Count events: 2 ---------------------------------------- EPOLL[0].data.ptr = 0x1ce8b0 EPOLL[1].data.ptr = 0xeeeeeeee So a workaround is to set maxevents to one. Like this: 226 void epoll_reactor::run(bool block, op_queue& ops) ... 240 int num_events = epoll_wait(epoll_fd_, events, 1, timeout); Is there a known bug about epoll on ARM? Or had boost::asio a bug? With best regards Peter > -----Original Message----- > From: Peter Meyer [mailto:r...@xmail.net] > Sent: Friday, February 11, 2011 7:57 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] Boost::Asio on ARMV5TE > > > Hi, > > i've wrote a litte proxy using boost::asio (boost 1.45). Program runs > well on Intel (Linux kernel 2.6.35.10 and gcc 4.5.1). > Same code cross compiled for ARMV5TE (Linux 2.6.24.4 and GCC 4.1.2 or > GCC 3.4.3) crashes always at the same point. > Stacktrace looks like this > > Program terminated with signal 11, Segmentation fault. > #0 0x400e3e20 in ?? () > (gdb) backtrace > #0 0x400e3e20 in ?? () > #1 0x0001cfb0 in boost::asio::detail::posix_mutex::lock (this=0x7d) at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /detail/posix_mutex.hpp:52 > #2 0x0001cfe6 in scoped_lock (this=0xbe8a98d0, m=@0x7d) at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /detail/scoped_lock.hpp:36 > #3 0x00069bf4 in boost::asio::detail::epoll_reactor::run > (this=0x191538, block=true, ops=@0xbe8a994c) > at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /detail/impl/epoll_reactor.ipp:275 > #4 0x0006a06c in boost::asio::detail::task_io_service::do_one > (this=0x1914e0, lock=@0xbe8a99d4, this_idle_thread=0xbe8a9990) > at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /detail/impl/task_io_service.ipp:264 > #5 0x0006a33c in boost::asio::detail::task_io_service::run > (this=0x1914e0, ec=@0xbe8a9a0c) > at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /detail/impl/task_io_service.ipp:130 > #6 0x0006a426 in boost::asio::io_service::run (this=0xbe8a9bc4) at > /usr/armv5tel-redhat-linux-gnueabi/sys-root/usr/local/include/boost/asio > /impl/io_service.ipp:57 > #7 0x00073504 in proxy::Server::run (this=0xbe8a9bb4) at server.cpp:71 > #8 0x0004e2a4 in main (argc=3, argv=0xbe8a9da4) at proxy.cpp:111 > > It looks like the internal epoll_events data structure > (descriptior_state) is corrupted. > > Any advice is welcome. > > With best regards > Peter > ------------------------------------------------------------------------------------

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[boost.asio] passing a boost::asio::io_service in to a constructure
by Sean Farrow 19 Feb '11

19 Feb '11

Hi: I'm new to working with asio, and have the following currently as two global variables: boost::asio::io_service FolderMonitoringService; boost::asio::dir_monitor dm(FolderMonitoringService); This works fine, but what I'd like to do is to make both variables private. When I do that, I get an error c2061 syntax error on the second line, in visual studio 2010. How can I pass a non-copyable class in to a constructor? Cheers Sean.

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BGL: half-edge-diagram or doubly-connected-edge-list
by Anders Wallin 19 Feb '11

19 Feb '11

Hi group, I want to work with meshes that contain vertices, edges, and faces(1)(2). I've subclassed adjacency_list and added a std::vector to contain the face-data: http://pastebin.com/h4jxpDkt Is there a better solution? (somewhere in the BGL docs it says sublcassing BGL-graphs can be dangerous?) How do I provide a graph_traits::face_descriptor for my sublcass? (now I am using "unsigned int" for face descriptors) How do I allow choice between a vector and a list for storing the vertices? I have also made my first ever attempt (3) to write some template-based code which manipulates this graph class. That file has lots and lots of "typedef" "typename" and "graph_traits" in it. Are there some macros or tools to simplify this style of programming I should be aware of? thanks, Anders (1) http://en.wikipedia.org/wiki/Doubly-connected_edge_list (2) http://www.youtube.com/watch?v=5Rd-u5n0pQs (3) http://code.google.com/p/opencamlib/source/browse/trunk/src/algo/halfedgedi…

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Subject: Formal Review of Proposed Boost.Process library starts tomorrow
by Marshall Clow 19 Feb '11

19 Feb '11

It's my pleasure to announce that the review of Boris Schäling's Process library starts tomorrow, February 7th and lasts until February 20, 2011, unless an extension occurs. What is it? =========== Boost.Process is a library to manage system processes. It can be used to: • create child processes • run shell commands • setup environment variables for child processes • setup standard streams for child processes (and other streams on POSIX platforms) • communicate with child processes through standard streams (synchronously or asynchronously) • wait for processes to exit (synchronously or asynchronously) • terminate processes Getting the library =================== The library is available at: http://www.highscore.de/boost/gsoc2010/process.zip with documentation at: http://www.highscore.de/boost/gsoc2010/ There was a quite involved "informal review" on the mailing list this past summer. That thread is archived here: http://thread.gmane.org/gmane.comp.lib.boost.devel/207594 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 (me!) 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. -- Marshall Review Manager for the proposed Boost.Process library

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[proto] Expressive C++ articles for offline reading
by Ravi 19 Feb '11

19 Feb '11

Hi, Is there a way to get the cpp-next articles on proto in a form readable offline? The best times for me to read them tend to be on buses and trains where I do not have access to the internet. There is too much (AJAX?) magic in the HTML sources for my poor browser to render the sources offline. Regards, Ravi

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[thread] Double Buffer Example
by Christian Henning 18 Feb '11

18 Feb '11

Hi there, I have some example code for boost::thread that illustrates a common multi-threaded design pattern. It's called Double Buffering which, I believe, is commonly used when a consumer is likely to be much slower processing items than a producer producing them. In this case a message queue is not really needed since a two element queue is as good as n element queue. Just imagine the case when a saving_to_database thread operates at 10MBit per second while a producer thread generates database rows at a 15MBit per second. For this example I decided to create a class binary_semaphore which simulates an event object that can either be set or unset. BTW, wouldn't a semaphore class be a nice addition to boost::thread? The code can be found here: http://pastebin.com/ASJp0t5h The code for the example is here: http://pastebin.com/VchGg8ci I think it would be great idea to add some simple pattern examples in the boost/libs/thread/example folder. Please let me know if there is a bug or potential race condition in the example. Regards, Christian

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[ICL] intersects(interval_set< int >, int) doesn't compile
by John Reid 18 Feb '11

18 Feb '11

AFAICT from the docs the following should compile: #include <boost/icl/interval_set.hpp> namespace icl = ::boost::icl; void interval_set_intersects() { icl::intersects( icl::interval_set< int >(), 1 ); } but I get a no match error: gcc.compile.c++ bin/gcc-4.4.3/debug/src/sandbox.o src/sandbox.cpp: In function ‘void interval_set_intersects()’: src/sandbox.cpp:7: error: No match for ‘intersects(boost::icl::interval_set<int, less, boost::icl::discrete_interval<int, less>, allocator> &, int)’ I'm using ICL in boost SVN revision 68965 John.

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installataion boost
by Faruk Kuşcan 18 Feb '11

18 Feb '11

hello, i need a quick answer. I downloaded boost_1_45_0.zip to my linux. I want to compile and build all the library. what should I do? can you explain step by step? thanks faruk

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Boost Asio and CYGWIN
by Jacques, Eduardo 18 Feb '11

18 Feb '11

Hi all, I am trying to build a simple application that uses boost::asio on netbeans using CYGWIN. But the compiler is giving me some link errors: Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs Configured with: /managed/gcc-build/final-v3-bootstrap/gcc-3.4.4-999/configure --verbose --program-suffix=-3 --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls --without-included-gettext --enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization --enable-libstdcxx-debug Thread model: posix gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) /usr/lib/gcc/i686-pc-cygwin/3.4.4/cc1plus.exe -quiet -v -I../../../cygwin/usr/include/Common -I../../../cygwin/usr/include/Communication -MMD build/Debug/Cygwin-Windows/main.d -MF build/Debug/Cygwin-Windows/main.o.d -MP -MQ build/Debug/Cygwin-Windows/main.o -D__CYGWIN32__ -D__CYGWIN__ -Dunix -D__unix__ -D__unix -idirafter /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api -idirafter /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../../include/w32api -D __USE_W32_SOCKETS -D _WIN32_WINNT=0x0501 main.cpp -quiet -dumpbase main.cpp -mtune=pentiumpro -auxbase-strip build/Debug/Cygwin-Windows/main.o -g -version -o /cygdrive/c/DOCUME~1/jacqueed/LOCALS~1/Temp/cccKQ1O6.s ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/include" ignoring duplicate directory "/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/lib/../../include/w32api" #include "..." search starts here: #include <...> search starts here: ../../../cygwin/usr/include/Common ../../../cygwin/usr/include/Communication /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++ /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/i686-pc-cygwin /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/backward /usr/lib/gcc/i686-pc-cygwin/3.4.4/include /usr/include /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../include/w32api End of search list. GNU C++ version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) (i686-pc-cygwin) compiled by GNU C version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125). GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../../i686-pc-cygwin/bin/as.exe -o build/Debug/Cygwin-Windows/main.o /cygdrive/c/DOCUME~1/jacqueed/LOCALS~1/Temp/cccKQ1O6.s mkdir -p dist/Debug/Cygwin-Windows g++.exe -D __USE_W32_SOCKETS -D _WIN32_WINNT=0x0501 -v -o dist/Debug/Cygwin-Windows/quickfasttest build/Debug/Cygwin-Windows/main.o -L../../../cygwin/usr/lib -L../../Downloads/quickfast_win_src_1_2/Output/Release -lboost_thread-mt -lboost_filesystem-mt -lboost_serialization-mt -lboost_regex-mt -lboost_system-mt -lboost_filesystem-mt -lwsock32 -lwinmm -lws2_32 -lQuickFAST Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs Configured with: /managed/gcc-build/final-v3-bootstrap/gcc-3.4.4-999/configure --verbose --program-suffix=-3 --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls --without-included-gettext --enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization --enable-libstdcxx-debug Thread model: posix gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) /usr/lib/gcc/i686-pc-cygwin/3.4.4/collect2.exe -Bdynamic --dll-search-prefix=cyg -o dist/Debug/Cygwin-Windows/quickfasttest.exe /usr/lib/gcc/i686-pc-cygwin/3.4.4/../../../crt0.o -L../../../cygwin/usr/lib -L../../Downloads/quickfast_win_src_1_2/Output/Release -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -L/usr/lib/gcc/i686-pc-cygwin/3.4.4 -L/usr/lib/gcc/i686-pc-cygwin/3.4.4/../../.. build/Debug/Cygwin-Windows/main.o -lboost_thread-mt -lboost_filesystem-mt -lboost_serialization-mt -lboost_regex-mt -lboost_system-mt -lboost_filesystem-mt -lwsock32 -lwinmm -lws2_32 -lQuickFAST -lstdc++ -lgcc -lcygwin -luser32 -lkernel32 -ladvapi32 -lshell32 -lgcc build/Debug/Cygwin-Windows/main.o: In function `_ZStorSt13_Ios_FmtflagsS_': /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiverD2Ev[QuickFAST::Communication::AsynchReceiver::~AsynchReceiver()]+0x4a): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioServiceD1Ev' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiverC2ERN5boost4asio10io_serviceE[QuickFAST::Communication::AsynchReceiver::AsynchReceiver(boost::asio::io_service&)]+0x63): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioServiceC1ERN5boost4asio10io_serviceE' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiver4stopEv[QuickFAST::Communication::AsynchReceiver::stop()]+0x1d): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioService11stopServiceEv' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiverD0Ev[QuickFAST::Communication::AsynchReceiver::~AsynchReceiver()]+0x4a): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioServiceD1Ev' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiverD1Ev[QuickFAST::Communication::AsynchReceiver::~AsynchReceiver()]+0x4a): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioServiceD1Ev' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiver11joinThreadsEv[QuickFAST::Communication::AsynchReceiver::joinThreads()]+0x12): undefined reference to `__imp___ZN9QuickFAST13Communication11AsioService11joinThreadsEv' /usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/ios_base.h:(.text$_ZN9QuickFAST13Communication14AsynchReceiver10runThreadsEjb[QuickFAST::Communication::AsynchReceiver::runThreads(unsigned Does anyone have an idea about what is going on? Eduardo Jacques BTG Pactual - IT Front Office BM&F Praia de Botafogo, 501/5º andar, Botafogo 22250-040 Rio de Janeiro, RJ, Brasil Telefone +55-21 3262 9617 Fax +55-21 3262 8600 eduardo.jacques(a)btgpactual.com www.btgpactual.com ********************************************************************** Visit our website at http://www.btgpactual.com The content of this message is confidential and was intended solely to its recipient. In case this message is received by mistake, please destroy it and notify the sender immediately. Electronic mails are not a safe channel for data transmission and the sender accepts NO liability for eventual errors, delays, loss, interception or virus infection. When necessary, the receiver must request a hard-copy version. O conteúdo desta mensagem é confidencial e destinado exclusivamente aos destinatários. Caso a receba por engano, favor destruí-la e notificar o remetente de imediato. 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