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Re: [Boost-users] Getting started with Boost: what did you need to know?
by Merrill Cornish 02 Feb '06

02 Feb '06

David, >>> So, this conclusion is from a sample of two libraries? No: filesystem, shared_ptr, any, thread, serialization, assign, date_time, format, program_options, regex, and test. Merrill

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[serialization] suggestion for the extension of the functionality
by Seweryn Habdank-Wojewódzki 02 Feb '06

02 Feb '06

Hello I would like to ask for consideration of some new functionality for boost::serialization. If I have a stream and I do not want to close the stream at the end of serialization I have to make easy, but nasty trick using stringstream as a buffer between my stream and serialized stream. More concrete example. I'am using easy library for sockets. Connection is represented as stream and after connection I do not want to close it. So when I try to use serialization though the socket, serialisation is hanging - it is waiting for the end of the stream, but there is no end of stream because it is socket. It will be useful just to add to library one fuction for manual sending data - "simulation" of the end of stream. To avoid or closing socket either using stringstreams buffers. Below is example code for this problem - this code is using buffers, but IMHO better will be that inside library will be functionality for such a situation. Best regards, Seweryn Habdank-Wojewódzki. Ps. Full code I can send if will be needed. void do_server() { string message("Hello Socket!\nHelloWorld!"); // create class instance const gps_position g(35, 59, 24.567f); try { TCPSocketWrapper sockserver; // listen on some port sockserver.listen(IPportnumber); cout << "server is ready" << endl; // accept connection from client TCPSocketWrapper sock(sockserver.accept()); cout << "accepted connection from: " << sock.address() << endl; // make the stream around the socket wrapper TCPStream stream(sock); bool oncemore = true; int command; while (oncemore) { // read the command stream >> command; switch (command) { case 1: { cout << "command 1" <<endl; // ------------------------------------------------ // buffer // ------------------------------------------------ std::ostringstream s; { boost::archive::text_oarchive oa(s); // write class instance to archive oa << g; } //------------------------------------------------------------------ // buffer //------------------------------------------------------------------ stream << s.str() << endl; } break; default: cout << "END command" << endl; oncemore = false; break; } } } catch (const SocketRunTimeException &e) { cout << "socket exception: " << e.what() << endl; } } void do_client() { string message; // ... some time later restore the class instance to its orginal state gps_position newg; try { TCPClientStream stream(IPserveraddress, IPportnumber); bool oncemore = true; int command; while (oncemore) { cout << "1. request for a serialized object" << endl; cout << "other - end" << endl; cin >> command; stream << command << endl; switch (command) { case 1: { // ------------------------------------------------ // buffer // ------------------------------------------------ std::string line; std::getline(stream, line); istringstream s(line); // ------------------------------------------------ // buffer will be filled // ------------------------------------------------ { boost::archive::text_iarchive ia(s); ia >> newg; } cout << "received: " << newg << endl; } break; default: oncemore = false; break; } } } catch (const SocketRunTimeException &e) { cout << "socket exception: " << e.what() << endl; } } -- |\/\/| Seweryn Habdank-Wojewódzki `\/\/

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building regex (extracted with bcp)
by Orhun Birsoy 02 Feb '06

02 Feb '06

I am trying to build the regex library which is extracted by the bcp utility. What I did: - extract the regex library C:\Development\3rdParty\boost_1_33_1>bcp regex c:\development\temp\regex - build it C:\Development\temp\regex\libs\regex\build>bjam "-sTOOLS=vc-8_0" "-sPYTHON_ROOT=C:\Program Files\Python24" "-sPYTHON_VERSION=2.4" --libdir=C:\development\temp\boost80\lib\ --includedir=C:\development\temp\boost80\include\boost80 --builddir=c:\development\temp\boost80\tmp install Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from C:\Development\temp\regex\libs\regex\build up to the root Please consult the documentation at 'http://www.boost.org'. Now it looks like it needs several jam files in order to build. Are the make files only way to build the regex library extracted with bcp? -- Orhun Birsoy

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RE: [Boost-users] BjÃ¶rn Karlsson's Boost Book
by James Hughes 02 Feb '06

02 Feb '06

I agree. I have the book and it has been very useful (although I have not used Boost in anger just yet as project is only just starting). He really needs to do another book that covers the rest of the library! James > -----Original Message----- > From: John Maddock [mailto:john@johnmaddock.co.uk] > Sent: 02 February 2006 10:27 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] BjÃ¶rn Karlsson's Boost Book > > > > BjÃ¶rn Karlsson has a book out titled "Beyond the C++ Standard > > Library: An Introduction to Boost". Is this book more than just a > > print out of the existing Boost HTML documentation? > > Absolutely, actually it's a very good book IMO (and not just > because I > proofread some of the chapters!). > > Basically, it looks at a selection of core Boost libraries, > and addresses > the following questions: > > What is it? > What's it good for? > How does it make my code better and more robust? > When should I use this? > How do I use it? > > So it's a bit like an extended tutorial, but it addresses the > when and why > questions much better than I've seen anywhere else. > > John. > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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BjÃ¶rn Karlsson's Boost Book
by Merrill Cornish 02 Feb '06

02 Feb '06

BjÃ¶rn Karlsson has a book out titled "Beyond the C++ Standard Library: An Introduction to Boost". Is this book more than just a print out of the existing Boost HTML documentation? Merrill

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[boost][serialization] How to implement serialization classes in two DLLs
by Marc Viala 02 Feb '06

02 Feb '06

Hi, I'm very sorry to post the message hereafter a second time, but I've not received any reply, maybe I've missed it. Any workaround or recommendations will be welcome because we are right now surrounded in our software development. Thanks in advance. Marc VIALA After few hour on the subject, I'm would like to have some explanations & recommendations one the boost serialization library. To explain, my problem, you will find hereafter a VC++ 7.1 project that demonstrates it. Problem Description We have involved in a large project with for example two DLLs libraries: LibA and LibB. These libraries define & implement one class, let's say libA::A and libB::B. These two classes can be serialized through boost serialization engine. The interfaces for the two classes are the same: ---------------------- struct LIBA_API A { std::vector<double> my_vector ; private: friend class boost::serialization::access; template<class Archive> void save(Archive & ar, const unsigned int version) const ; template<class Archive> void load(Archive & ar, const unsigned int version) ; BOOST_SERIALIZATION_SPLIT_MEMBER() }; LIBA_API void save(const libA::A* pObj, std::ostream& os) ; LIBA_API void load(libA::A* &pObj, std::istream& is) ; }; // Namespace libA ---------------------- The two free functions save() and load() are defined to be able to serialize the class libA::A (respectively the class libB::B). When, we try to use these interfaces in an EXE application: ---------------------- #include <LibA/A.h> #include <LibB/B.h> #include <boost/filesystem/path.hpp> #include <boost/filesystem/fstream.hpp> #pragma comment(lib, "liba_d.lib") #pragma comment(lib, "libb_d.lib") int main(int argc, char* argv[]) { libA::A a; libA::save(&a, boost::filesystem::ofstream("a.xml")); libB::B b; libB::save(&b, boost::filesystem::ofstream("b.xml")); // -> Assert in debug mode return 0; } ---------------------- The figure hereafter describes the relationships between LibA, LibB and EXE application: ------------ ------------ | LibA | | LibB | ------------ ------------ \ / \ / Exe Application We have to face to an assert in debug mode generate by the file boost::serialization::extended_type_info.cpp, line#71. This assert happens during the instance serialization of class libB:B. Recently, there are some posts on this subject, but I would like to known how I can deal with this assert? Is it possible to avoid it by a code organisation? Is it possible to comment this assert? To have a concrete answer, I have joined my complete VC++7.1 project. Thanks in advance for your help. Development Platform WindowsXP VC++ 7.1 Boost 1.33.1 Marc Viala mailto:mviala@acticm.com <mailto:mviala@acticm.com>

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Re: [Boost-users] trying to install Boost 1.33.1 on Solaris 5.9 + SunStudio 11
by paul.floyd 02 Feb '06

02 Feb '06

... > If found this in the sun forum. > http://blogs.sun.com/roller/page/sga > Contains a patch to boost 1.33.1 and 1.32.0 to help compiling on sun. Very interesting. Can anyone comment as to whether these changes are going to be integrated to boost? They haven't been yet (at least in the code that I can browse with the web interface). A+ Paul Accédez au courrier électronique de La Poste : www.laposte.net ; 3615 LAPOSTENET (0,34 /mn) ; tél : 08 92 68 13 50 (0,34/mn)

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[program_options] Uncatchable Errors
by Merrill Cornish 02 Feb '06

02 Feb '06

I have a minimal program below that uses the program_options library. If executed with no options or with --help as an option, it correctly prints "End of option processing" and does nothing else. However, if you give it an unexpected option such as --x, then (in my case) Zone Alert pops up saying that "somone" is trying to launch Dr Watson. If the try/catch is omitted, a message is printed to the console: "This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information." Am I doing something wrong to make unexpected options behave so badly? Merrill ========================================== #include <iostream> #include <stdexcept> #include "boost/program_options.hpp" namespace po = boost::program_options; using namespace std; int main(int argc, char* argv[]) { try { po::options_description general_verbose("Options"); general_verbose.add_options() ("help,h", " Display this help message."); po::variables_map vm; po::store(po::command_line_parser(argc, argv). options(general_verbose).run(), vm); po::notify(vm); }//try catch(std::exception ex) { cout << "Exception: " << ex.what() << endl; } catch(...) { cout << "Unknown exception." << endl; } cout << "End of option processing." << endl; }//main()

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[python] create a custom exception
by boost.users＠cgrealy.mailcan.com 02 Feb '06

02 Feb '06

Is it possible to create a C++ to python exception translator that raises a custom python exception? I know you can use register_exception_translator to translate from a c++ exception to a standard python exception, but is it possible to raise a user-defined exception? Regards, Colin

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Re: [Boost-users] [serialization] compile error
by cheesy4poofs 02 Feb '06

02 Feb '06

> I compiled the following program wiht no errors on my vc 7.1 > system with no errors or warnings > > Robert Ramey I finally solved my problem by commenting out the following include: //#include <boost/serialization/base_object.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/map.hpp> Not sure why it solved it, but I'm glad at least to have put this behind me. Thanks for the help. Scott

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