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[serialization] Test for end of archive
by Tom Aylesworth 08 Apr '09

08 Apr '09

Is there a way to test for the end of an archive, similar to testing for end of a stream? I have an indeterminate number of objects serialized to an archive and would like to loop until the end of the archive has been reached without reading past the end of the archive and getting a stream exception. Thanks! Thomas Aylesworth Senior Software Engineer Reality Mobile

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Determining thread existence
by Jeremy Rottman 08 Apr '09

08 Apr '09

I am trying to setup my application so that it runs as a daemon. One aspect that I need to run a sanity check on is to determine if there are currently any parent threads running. Currently this is what I am testing with, when all threads are finish running, I then join all the threads to terminate them. Doing so should give me a thread group size of 0. However, this is now the case. Currently after I join the threads, the thread group size is still 0. Here is my current test code that I am working with. Any help with this is greatly appreciated. int main(int argc, char *argv[]) { InitConfig mconfig; if(mconfig.setConfig()){ boost::thread_group Tg; cout << "Thread Size Before: " << Tg.size() << endl; // DISPLAYS 0 for(int i = 1; i < 25; i++){ dmParse parse; Tg.create_thread(boost::bind(&dmParse::onInit,parse,i)); } cout << "Thread Size: " << Tg.size() << endl; // DISPLAYS 24 Tg.join_all(); cout << "Thread Count After:" << Tg.size() << endl; // DISPLAYS 24 }

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a vector of subgraphs
by fabricio 08 Apr '09

08 Apr '09

Hello, I'm creating a program that will require a vector, of dynamic size, of subgraphs. so let's suppose I have something like this: typedef subgraph< adjacency_list > Graph; Graph G; what I want is to create a: vector< Graph& > subG; but the usage of & here is illegal. Do you guys have any suggestion on how to do it? regards,

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Re: [Boost-users] [serialization] Export question
by Tom Aylesworth 08 Apr '09

08 Apr '09

I think I just answered my own question regarding whether I can use the EXPORT macro in the header that declares the class being exported. Since the EXPORT macro instantiates a static guid_initializer for the class, including it in multiple source files creates multiple static objects and results in link errors. So at this point, I wonder, why bother with the EXPORT macro at all? Given that the class has to be registered with the archive, why not just use register_type when the archive is created? When I thought the EXPORT macro allowed me to register the class in the same header where the class is created, it seemed very useful. Now I guess I don't see any advantage of using EXPORT. Am I missing something? Thomas Aylesworth Senior Software Engineer Reality Mobile

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[mpl] newbie question about if_c et al
by Jonathan Leonard 08 Apr '09

08 Apr '09

Hi, I'm trying to make a class which is conditionally synchronized. What I have is like the following: template<bool SYNCH=true> class c { public: void f() { typename boost::mpl::if_c<SYNCH, ScopedCriticalSection<>, void*>::type scs(cs); // SCS == RAII wrapper around CS // do other stuff } private: typename boost::mpl::if_c<SYNCH, CriticalSection<>, void*>::type cs; }; This is not entirely optimal though as it requires 3 MOV instructions to create the scs void* copy when SYNCH is false (and I'd rather not lean on compiler optimizations even if they will help in this case). [Something like NullType, VoidType, or OptionType (a la F#) would be ideal but I can't seem to locate one (and I'm not sure the type system would allow such a thing-it doesn't seem to like a simple 'void']. Any better idiom or alternative approach anyone can offer for this purpose would be greatly appreciated. Many thanks, Jonathan

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Re: [Boost-users] Linking with dynamic boost thread library
by Steven Watanabe 08 Apr '09

08 Apr '09

AMDG Green, Jason M NSWCDL, W33 wrote: > I'm having a similar problem with my project. I'd like to use the dlls but > no matter what, the compile warns me that it "cannot open file > 'boost_regex-vc80-mt-gd-1_38.lib'" > You /are/ linking to the dll then. > I'm trying to find where I can set the project (in vis studio 2005) to use > the dynamic link libraries as opposed to the static. Based on previous > entries in this thread, I assume that is the first step that I need to take. > Have you added the location of the libraries to the library paths? (Tools->Options->Projects and Solutions->VC++ Directories, I think) > Can someone tell me where to set this? > In Christ, Steven Watanabe

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Re: [Boost-users] Linking with dynamic boost thread library
by Ovanes Markarian 08 Apr '09

08 Apr '09

Project Properties -> C/C++ -> Code Generation: Runtime Library: Multi-Threaded Debug DLL (/MDd) or Multi-Threaded DLL (/MD) for release version Good Luck, Ovanes On Wed, Apr 8, 2009 at 6:40 PM, Green, Jason M NSWCDL, W33 < jason.m.green3(a)navy.mil> wrote: > I’m having a similar problem with my project. I’d like to use the dlls > but no matter what, the compile warns me that it “cannot open file > ‘boost_regex-vc80-mt-gd-1_38.lib’” > > > > I’m trying to find where I can set the project (in vis studio 2005) to use > the dynamic link libraries as opposed to the static. Based on previous > entries in this thread, I assume that is the first step that I need to take. > > > > Can someone tell me where to set this? > > Jason > > > > *From:* boost-users-bounces(a)lists.boost.org [mailto: > boost-users-bounces(a)lists.boost.org] *On Behalf Of *Ovanes Markarian > *Sent:* Wednesday, April 08, 2009 11:01 AM > *To:* boost-users(a)lists.boost.org > *Subject:* Re: [Boost-users] Linking with dynamic boost thread library > > > > What I mean is the reversed order. You can not link the static runtime and > dynamic boost_thread or any other lib. > > On Wed, Apr 8, 2009 at 4:50 PM, Steven Watanabe <watanabesj(a)gmail.com> > wrote: > > AMDG > > > > Igor MI wrote: > > But now I wonder about what Ovanes said. Why did I linked successfully with > static thread library when my project is set to multi threaded debug dll? > > > > > You can link using the dll runtime and the static boost_thread. > > > > In Christ, > Steven Watanabe > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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[ASIO] Synchronous write on serial_port
by Daniele Barzotti 08 Apr '09

08 Apr '09

Hi, I'm developing a library that use ASIO Serial Port and I need to implement a synchronous write. The structure is: EuroATLib.cpp : library main file Serial.cpp : serial port class that wrap asio::serial_port ATDispatcher.cpp : a dispatcher object ATModem.cpp : the consumer object The problem is that my code writes characters on serial port very slowly (1 char every 10 seconds) and I can't understand why. Also, when the program ends, the io_service thread seems to be already alive: it continues to write to serial port for a while! The implementation is like this...can someone give me some feedback? PS: In the following code TBUFFER is std:string. In EuroATLib.cpp : ---------------------------------------------------------- // Main io_service static boost::asio::io_service io_service; static boost::scoped_ptr<boost::thread> io_service_thread; /*! \brief Factory function for ATModem objects creation */ EXTERN_C EUROATLIB_API ATModem* CALL CreateATModemObj() { static bool thread_started; if (!thread_started) { try { // run the IO service as a separate thread io_service_thread.reset(new boost::thread( boost::bind(&boost::asio::io_service::run, &io_service) )); thread_started = !thread_started; } catch (boost::thread_resource_error e) { // Failed to create the new thread return 0; } } // create the new object return new ATModem(io_service); }; ---------------------------------------------------------- In Serial.hpp : ---------------------------------------------------------- // the main IO service that runs this connection boost::asio::io_service& _io_service; // the serial port this instance is connected to boost::asio::serial_port _serialPort; ---------------------------------------------------------- In Serial.cpp : ---------------------------------------------------------- SerialPort::SerialPort(boost::asio::io_service &_io) : m_buffer_size(100), _io_service(_io), _serialPort(_io_service), _rx_timer(_io_service), ReadTimeOut(READ_TIMEOUT) { //init_dcs(); EosString = '\n'; _buf = 0; }; BOOL SerialPort::Write(TBUFFER &buffer) { _io_service.post(boost::bind(&SerialPort::do_write, this, buffer)); return true; }; void SerialPort::do_write(TBUFFER &buffer) { // size_t byte_written = boost::asio::write(_serialPort, boost::asio::buffer(buffer.c_str(), buffer.size())); size_t byte_written = _serialPort.write_some(boost::asio::buffer(buffer.c_str(), buffer.size())); }; ---------------------------------------------------------- In ATDispatcher.cpp simply have a SerialPort member and a function SendCommand that start a timer and call Serial.Write(cmd) In ATModem.cpp I have an ATDispatcher Object on which it calls disp_obj.SendCommand("AT+CMGS"): ---------------------------------------------------------- RET_VAL ATModem::Connect(std::string DevName) { if (DevName.length() > 0) SetComPort(DevName); if (!_serial_port.Open()) return -1; //Connect the OnDataReceived event to the ATDispatcher object _dispatcher->OnData(boost::bind(&EuroATLib::ATModem::OnDataReceived, this)); //Register Voice Service if ( _dispatcher->SendCommand("AT+CTSP=2,0,0") != ATDispatcher::RET_OK ) return DEV_AT_CMD_ERROR; //Register STATUS Service if ( _dispatcher->SendCommand("AT+CTSP=2,2,20") != ATDispatcher::RET_OK ) return DEV_AT_CMD_ERROR; this->SetStatus(STATE_READY); }; ---------------------------------------------------------- Finally in the main client program: // Create a ATModem object boost::scoped_ptr<ATModem> _devATModem( CreateATModemObj() ); _devATModem->Connect("\\\\.\\COM1");

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Linking with dynamic boost thread library
by Igor 08 Apr '09

08 Apr '09

I build the thread library with the following cmd command: bjam.exe toolset=msvc --with-thread --prefix=C:\boost\ variant=debug,release link=shared install after which I get the following libs: boost_thread-vc80-mt.lib boost_thread-vc80-mt-1_38.dll boost_thread-vc80-mt-1_38.lib boost_thread-vc80-mt-gd.lib boost_thread-vc80-mt-gd-1_38.dll boost_thread-vc80-mt-gd-1_38.lib In my application, I placed #define BOOST_THREAD_DYN_LINK in all the cpp files where thread library is included. I get the following error: LINK : fatal error LNK1104: cannot open file 'libboost_thread-vc80-mt-gd-1_38.lib' How many mistakes have I done?

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Re: [Boost-users] difference b/w regex lib files
by John Maddock 08 Apr '09

08 Apr '09

>I have a number of boost libs that I built (not being sure which one I > really needed). I understand the difference b/w them, with the exception > of > two. libboost*.lib are static link libraries, and boost*.lib are import libraries for the dll's. HTH, John.

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