- Boost-users - lists.boost.org

[Boost::Serialization] How to serialize a dynamic array within a class
by Chengyuan Ma 03 Feb '08

03 Feb '08

I have a class needs to be serialized into an XML file. I can save the object into an XML file, but i can not load it back. I found the problem is the dynamic array, "double *pMixtureWeight". What's the correct way to serialize a dynamic array into a XML file if i don't want to change it to a vector<double>? thx a lot! class Model { public: Model(); virtual ~Model() ; private: // serialization support friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */) { ar & boost::serialization::make_nvp("FeatureDim", FeatureDim) ; ar & boost::serialization::make_nvp("MixtureNum", NumMixtures) ; for(int ii = 0 ; ii < m_iNumMixtures; ii ++ ) { string tag = "weight_" + boost::lexical_cast<string>(ii + 1) ; ar & boost::serialization::make_nvp(tag.c_str(), pMixtureWeight[ii]) ; } } private: int FeatureDim; int NumMixtures; double *pMixtureWeight; };

2 1

[Boost.Filesystem] Is there any bug in ofstream implementation ?
by Marc Viala Perso 02 Feb '08

02 Feb '08

Hi, I not pretty sure but it seems that there is a bug (?) somewhere in boost::filesystem::ofstream implementation in the Boost 1.34.1 release; to exhibit this behaviour, the snippet code hereafter trigger an assert in the last block: int main(int /*argc*/, char* /*argv[]*/) { const fs::path p("c:/temp/test.txt") ; const fs::wpath wp(L"c:/temp/test.txt") ; { fs::remove(p) ; fs::ofstream ofile(p) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(wp) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(p, std::ios_base::binary) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(wp, std::ios_base::binary) ; assert(!ofile.fail()) ; // <-- Assert triggered here } } Running conditions: Boost 1.34.1 Visual C++ 7.1 Windows XP I'm waiting for your feedback. Best regards, Marc VIALA

2 2

building boost libraries with VS2008 (VC9)
by Prashant Gupta 02 Feb '08

02 Feb '08

I have both VS2005 (VC8) and VS2008 (VC9) on the same machine. I have already downloaded 'boost_1_34_1.zip' and installed a complete boost distribution. On the command prompt, I go to $BOOST_ROOT and type just "bjam", with no arguments. I get the complete VC8 build in a clean way. I follow the same procedure to build using VS2008 (vc9). I go to the $BOOST_ROOT and type "bjam --toolset=msvc-9.0 stage". I get bunch of errors, resulting in failure. Could someone help me in building clean boost libraries, using VS2008 (VC9)?

2 1

[Boost Interprocess] - Windows 64-bit / 32-bit mixed process support
by Richard Brown 01 Feb '08

01 Feb '08

Ion, I have a server process and multiple client processes which successfully share a managed_shared_memory vector as well as two message_queues. All processes are 32-bit, and run under both Windows XP and 64-bit XP Server (using 32-bit Wow emulation). However I am trying to take advantage of the Windows XP 64-bit OS, so I have attempted to build the Server process as 64-bit, while leaving the client processes at 32-bit (unfortunately I'm stuck with some 32-bit libraries and cannot move the client processes to x64 at this time). Both the server and clients (64 bit and 32 bit respectively) can see the shared memory file that Interprocess creates, and my class members use fixed-sized datatypes (__int32, __int64), but after walking some of the code it became apparent that Interprocess is having issues with mixing the different processes. Example: message_queue::do_receive(block_t block, void *buffer, std::size_t buffer_size, std::size_t &recvd_size, unsigned int &priority, const boost::posix_time::ptime &abs_time) ... ... //Thre is at least message ready to pick, get the top one detail::msg_hdr_t *top_msg = p_hdr->top_msg(); //Paranoia check if (top_msg == 0) { throw interprocess_exception(); } //Get data from the message recvd_size = top_msg->len; priority = top_msg->priority; ... ... The contents of top_msg appear to be "shifted", such that "top_msg->len;" now returns a 0. Obviously much of this is due to std::size_t being sized differently on the server process (at 64-bit) vs. the client (32-bit) processes. II thought of doing a bit of experimentation, whereby I could replace all instances of std::size_t in the library with something windows specific - like "unsigned __int64", but I have no idea if variations in data type size are the only issue. Should I give it a try or perhaps a different approach would be better? Thanks, Rich Brown if (Nabble.searchterms != null && Nabble.searchterms.length > 0) { Nabble.hilt(Nabble.searchterms, Nabble.get("nabble.msgtxt15191825")); }  //Nabble.gquery = 'test'; //Nabble.topicDumpSearch = true; if (Nabble.gquery!=null) { if (Nabble.topicDumpSearch) { Nabble.get('nabble.searchResults').innerHTML = '<h1> Other threads matching \"<strong>'+Nabble.gquery+'</strong>\":</h1>'+ '<p style=\"margin-left: 3em;\">looking for matching threads...</p>'; Nabble.loadScript('/forum/TopicDump$SearchJs.jtp?query='+encodeURIComponent(Nabble.gquery)+'&post=15191825'); Nabble.setVar('prev',null); } else { Nabble.setVar('prev', '<big><a id="nabble.prev_search" href="/forum/Search.jtp?query='+encodeURIComponent(Nabble.gquery)+'">Search Nabble for "<b>'+Nabble.gquery+'</b>"</a>' ); } } if( Nabble.prev ) Nabble.writeReturnToLink(Nabble.prev);

2 1

Howto bind with string_algo predicates on gcc?
by Jean-Pierre Bergamin 01 Feb '08

01 Feb '08

Hello everyone I ran into an issue I cannot explain, when using bind with the string algorithms. The following code fragment works as expected with MSVC 8.0: #include <boost/algorithm/string/predicate.hpp> #include <boost/bind.hpp> #include <iostream> #include <vector> #include <string> using namespace std; using namespace boost; using namespace boost::algorithm; int main() { typedef vector<string> string_container; string_container numbers; numbers.push_back("one"); numbers.push_back("two"); numbers.push_back("three"); string_container::const_iterator s = find_if(numbers.begin(), numbers.end(), bind(&contains<string, string>, _1, "w")); if (s != numbers.end()) { cout << "Found: " << *s << endl; } return 0; } Trying to compile the same code with gcc 3.4.5 gives the error: test.cpp:18: error: no matching function for call to `bind(<unknown type>, boost::arg<1> (&)(), const char[2])' Does anyone has an idea how to let bind know the "type" of the predicate "contains"? Regards Jean-Pierre Bergamin

2 1

type trait for detecting unsigned integer
by Stephen Torri 01 Feb '08

01 Feb '08

Is there a way to detect a unsigned integer? I would like to have a template to replace a macro that checks a value is in a range. Here is what I have so far: template <typename Limit_Type> static inline void in_range ( boost::uint32_t value, Limit_Type limit ) { if ( value > limit ) { throw errors::Internal_Exception ( errors::Internal_Exception::INVALID_VALUE ); } } I would like to replace the "boost::uint32_t" with a default typename and check to see if the 'value' is an unsigned type. Stephen

3 2

Boost.Utility/Singleton Problem when using with dynamic libraries
by NFarnsworth＠web.de 01 Feb '08

01 Feb '08

Hello, I want to use the Boost.Utility/Singleton together with dll's. I use the Visual Studio 2005 and Windows XP. I have three dynamic libraries. In library A the Singleton is implemented and library B and C access to the Singleton. The dynamic libraries B and C are compiled with the clr compiler Option. The Problem is, that the Singleton will be twice instantiated when library A and B access to the singleton. The singleton declaration looks like the following code: //Singleton.h class Singleton : public boost::singleton<Singleton ,1,factorylib_tag > { public: CPP_API Singleton (boost::restricted); … BOOST_SINGLETON_PLACEMENT_DECLARATION … } CPP_API is a definition of the dll export. #if defined( _WIN32 ) && defined( _MSC_VER ) # if defined SINGLETON_EXPORTS # define CPP_API __declspec( dllexport ) # else # define CPP_API __declspec( dllimport ) # pragma warning( disable : 4251 ) // 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2' # endif #endif In the Project properties of library B and C in "additional linkage input" I included the import library of the dll A. Another problem is, that the application crashes when I close the application. The crash happens in C.dll!_CRT_INIT(void * hDllHandle=0x0f8b0000, unsigned long dwReason=0, void * lpreserved=0x00000001) line 420 -> _free_crt ( onexitbegin ) ; And also : B.dll!_CRT_INIT(void * hDllHandle=0x0f8b0000, unsigned long dwReason=0, void * lpreserved=0x00000001) line 420 -> _free_crt ( onexitbegin ) ; If I don't use the singleton, the application will not crash. Another Problem is, that I can not compile the following code: class DataPoolManagerImpl : public boost::mutexed_singleton<DataPoolManagerImpl,2,datapoollib_tag> { Then I will get the following error message: boost\utility\mutexed_singleton.hpp(212) : error C2248: "boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy": cannot access private class, which is declared in boost::mutexed_singleton<Derived,DisposalSlot> with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] \boost\utility\mutexed_singleton.hpp(41): see declaration of 'boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy' with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] \boost\utility\mutexed_singleton.hpp(211): During compiling the class template of the static data member "const boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance_proxy boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance". with [ Derived=DataPoolManagerImpl, DisposalSlot=2, SubsystemTag=datapoollib_tag ] \datapoolmanager.h(43): see reference of instantiation of compiled class template "boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>". with [ DataPoolManagerImpl, DisposalSlot=2, datapoollib_tag ] \boost\utility\mutexed_singleton.hpp(212) : error C2440: Initialization': 'boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy' could not converted in 'boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance_proxy' with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] With : class DataPoolManagerImpl : public boost::singleton<DataPoolManagerImpl,2,datapoollib_tag> There are no compiler errors. Could you tell me how I can solve these problems please? Thank you for your help in advance and best regards Niklas _____________________________________________________________________ Unbegrenzter Speicherplatz für Ihr E-Mail Postfach? Jetzt aktivieren! http://www.digitaledienste.web.de/freemail/club/lp/?lp=7

1 0

Question about Boost Interfaces
by Martin de Lasa 01 Feb '08

01 Feb '08

Hi, Does anyone know the status of the Boost.Interfaces Library proposed by Chris Diggins in 2004? I have found a few references to it on the internet, including one on the Boost Wiki, but it seems to not have ever made it into the official Boost library. I am interest in exploring how Aspect-Oriented Programming techniques might be incorporate into an existing code-base, and would prefer to use a library based solution, rather than a special preprocessor (eg. apsectc++). Since Boost has come to the rescue in the past (with elegant solutions), in this respect, I thought I would start here. If boost.interfaces is dead, does anyone have any suggestions for C++ library-based AOP solutions that have worked for them. Thanks in advance. Martin

2 3

Boost MPI
by Renato Golin 01 Feb '08

01 Feb '08

Hiya, I've heard that MPI was accepted and reviewed, but I can't find it in my regular Boost distribution (ubuntu) nor in the web site. If this is the specification, I'm SO looking forward to use it. http://www.osl.iu.edu/~dgregor/boost.mpi/doc/ Do you have any ideas when / if this is going to be finally approved and distributed with Boost? cheers, --renato -- Reclaim your digital rights, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm

2 3

Boost 1.34.1 build fails on openSUSE 10.3
by Christoph Duelli 01 Feb '08

01 Feb '08

Trying to build Boost 1.34.1 on OpenSuse 10.3 fails for me: soft@mxt2:/tmp/boost_1_34_1> ./configure Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.5 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in user-config.jam... Generating Makefile... soft@mxt2:/tmp/boost_1_34_1> make ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam /bin/sh: line 1: 15631 Segmentation fault ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam Not all Boost libraries built properly. soft@mxt2:/tmp/boost_1_34_1> cat /etc/*release LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32" openSUSE 10.3 (i586) VERSION = 10.3 I have built Boost (both this and older versions) on other machines before, so I assume the "./configure; make" should work (although I usually do specify a --prefix). Does anyone know (the cause of) this error? Thank you in advance and best regards Christoph

2 2