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[MPL] has_xxx always returns false!
by Eric 27 Aug '10

27 Aug '10

This code: BOOST_MPL_HAS_XXX_TRAIT_DEF(normal); template<class T, bool HasNormal> class getVertexHasNormal { public: static void getNormal(T &tv) {} }; template<class T> class getVertexHasNormal<T, true> // true case { public: static void getNormal(T &tv) { // do something } }; template<class VT> class A : public base { void doit(v) /* override */ { VT tv; getVertexHasNormal<VT, has_normal<VT>::value >::getNormal(tv); } } if I understand correctly, this code is suppose to do call a different "getNormal" method if the method "normal" exists (or not) in the template parameter class. Basically mimicking the infamous "__if_exists" macro on the Microsoft c++ compiler.... right? but, has_normal<VT> always return false (visual studio 2008) so we don't get the right expected behavior! Feel free to educate me.... thanks in advance. eric

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[Serialization] Is this example legal usage of the serialization library
by Elizabeta 26 Aug '10

26 Aug '10

Hi, Is it ok to serialize/deserialize in the object I get when dereference a pointer ? void f() { B* bObj=new B(); /// save { std::ofstream ofs("C:\\hh.txt"); boost::archive::xml_oarchive oa(ofs); oa & make_nvp("bObj",*bObj); } //// Load { std::ifstream ifs("C:\\hh.txt"); boost::archive::xml_iarchive ia(ifs); ia & make_nvp("bObj",*bObj); } } My second question : Is it ok to serialize/deserialize in *this ? Thanks

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[serialization] problem with custom archive type
by Kenneth Riddile 26 Aug '10

26 Aug '10

I have a custom input archive type that has worked fine when statically linked to the serialization library. I'm now must use serialization as a DLL and the code no longer compiles. This is under MSVC9 with BOOST_ALL_DYN_LINK defined. This code works fine on Linux/GCC with serialization built as a shared library...so the problem appears specific to Windows/MSVC. Here is a boiled down version of the code that exhibits the problem: // HEADER CONTENTS #include <boost/archive/xml_iarchive.hpp> class CustomArchive : public boost::archive::xml_iarchive_impl<CustomArchive> , public boost::archive::detail::shared_ptr_helper { public: CustomArchive( std::istream& is, int foo ) : boost::archive::xml_iarchive_impl<CustomArchive>( is, 0 ) , m_foo( foo ) { } int GetFoo() const { return m_foo; } template<class T> void load( T& t ) { boost::archive::xml_iarchive_impl<CustomArchive>::load( t ); } private: friend class boost::archive::xml_iarchive_impl<CustomArchive>; friend class boost::archive::basic_xml_iarchive<CustomArchive>; friend class boost::archive::load_access; int m_foo; }; // CPP CONTENTS #include <CustomArchive.hpp> #include <boost/archive/impl/basic_xml_iarchive.ipp> #include <boost/archive/impl/xml_iarchive_impl.ipp> #include <boost/archive/impl/archive_serializer_map.ipp> namespace boost { namespace archive { template class basic_xml_iarchive<CustomArchive>; template class xml_iarchive_impl<CustomArchive>; template class detail::archive_serializer_map<CustomArchive>; } } BOOST_SERIALIZATION_REGISTER_ARCHIVE( CustomArchive ) and here are the errors: 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(41) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_start' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(77) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_end' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(83) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(89) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(95) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(101) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(108) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::basic_xml_iarchive' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/basic_xml_iarchive.ipp(111) : error C2491: 'boost::archive::basic_xml_iarchive<Archive>::~basic_xml_iarchive' : definition of dllimport function not allowed 1>Warning: This header is deprecated. Please use: boost/spirit/include/classic_rule.hpp 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(83) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(114) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(127) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(140) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(153) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::load_override' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(162) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::init' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(189) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::xml_iarchive_impl' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/xml_iarchive_impl.ipp(202) : error C2491: 'boost::archive::xml_iarchive_impl<Archive>::~xml_iarchive_impl' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/archive_serializer_map.ipp(45) : error C2491: 'boost::archive::detail::archive_serializer_map<Archive>::insert' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/archive_serializer_map.ipp(57) : error C2491: 'boost::archive::detail::archive_serializer_map<Archive>::erase' : definition of dllimport function not allowed 1>C:\Boost\include\boost/archive/impl/archive_serializer_map.ipp(67) : error C2491: 'boost::archive::detail::archive_serializer_map<Archive>::find' : definition of dllimport function not allowed

2 4

[interprocess] Checking for existence Named Mutex
by Brian Davis 26 Aug '10

26 Aug '10

How do I check for the existence of a named resource in using boost interprocess without wrapping a open_only in a try catch block and waiting for the exception? Also are there calls for launching a process such as std::system that are nonblocking in Windows using the _spawnlp and friends calls?

3 5

Boost's additional test compilers - test results available?
by Jon Payne 26 Aug '10

26 Aug '10

Hi all, In the boost release notes (I was looked at 1.44) there is a section listing the "additional test compilers" - I use Borland/Codegear C++ 2010. Presumably this means the tests are run on those compilers? If so, are the results available anywhere? Thanks, Jon

1 0

Bost.thread: how to force Pthreads-w32 usage with MingW (x-compile)?
by Joost Kraaijeveld 26 Aug '10

26 Aug '10

Hi, I have x-compiled Boost using Pthreads-w32, using threading=multi,single threadapi=pthread. But when I x-compile my application Boost uses the win32 headers. I have looked at the thread sources but I cannot find out if it just should work or that I should use some macros. Can anyone help me with this? TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

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X-compile: undefined reference to `boost::this_thread::interruptible_wait using Boost 1.42
by Joost Kraaijeveld 26 Aug '10

26 Aug '10

Hi, I am cross compiling an application from Linux to Windows using Boost 1.42. Doing that I get an undefined reference error when linking one of my own dll's to my own application: /bin/bash ../../libtool --tag=CXX --mode=link i586-mingw32msvc-g++ -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/home/jkr/mingw/boost/include -g -O2 -Wl,--enable-runtime-pseudo-reloc,--enable-auto-import -no-undefined -L/home/jkr/mingw/boost/lib -o ORBRegistration.exe ORBRegistration-Main.o ../../../library/DagdaORB/libdagdaorb.la ../../../library/DagdaCom/libdagdacom.la /home/jkr/Programming/C++/Danu/mingw/library/DanuBase/libdanubase.la /home/jkr/Programming/C++/Danu/mingw/library/DanuStream/libdanustream.la /home/jkr/Programming/C++/Danu/mingw/library/DanuDB/libdanudb.la -lboost_system-mt -lboost_serialization-mt -lboost_thread-mt -lboost_date_time-mt -lboost_filesystem-mt -lws2_32 -lmswsock libtool: link: i586-mingw32msvc-g++ -pipe -Wall -Wextra -Wundef -Wshadow -Wconversion -I/home/jkr/mingw/boost/include -g -O2 -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-import -o .libs/ORBRegistration.exe ORBRegistration-Main.o -L/home/jkr/mingw/boost/lib ../../../library/DagdaORB/.libs/libdagdaorb.a /home/jkr/Programming/C++/Dagda/mingw/library/DagdaCom/.libs/libdagdacom.a ../../../library/DagdaCom/.libs/libdagdacom.a /home/jkr/Programming/C++/Danu/mingw/library/DanuDB/.libs/libdanudb.a /home/jkr/Programming/C++/Danu/mingw/library/DanuStream/.libs/libdanustream.a /home/jkr/Programming/C++/Danu/mingw/library/DanuBase/.libs/libdanubase.a -lpthread -lodbc32 -lboost_system-mt -lboost_serialization-mt -lboost_thread-mt -lboost_date_time-mt -lboost_filesystem-mt -lws2_32 -lmswsock ../../../library/DagdaORB/.libs/libdagdaorb.a(libdagdaorb_la-IMRServer.o): In function `_ZN5boost6detail19basic_cv_list_entry4waitENS0_7timeoutE': /home/jkr/mingw/boost/include/boost/thread/win32/condition_variable.hpp:82: undefined reference to `boost::this_thread::interruptible_wait(void*, boost::detail::timeout)' collect2: ld returned 1 exit status I have no idea why I get this error, and hence no idea how to solve it. Does anyone have any idea? Additional info: - I cross-compiled Boost itself using the Debian's gcc-mingw32 4.4.4-0.1+b1 crosscompiler, - I used Pthreads-w32 release 2.8.0 (2006-12-22) - The full commandline I used was (the commandline is split for readability): PTW32_INCLUDE=/home/jkr/mingw/pthreads/include PTW32_LIB=/home/jkr/mingw/pthreads/lib bjam --prefix=/home/jkr/mingw/boost --layout=tagged link=shared variant=debug,release toolset=gcc target-os=windows threading=multi,single runtime-link=shared --without-python --without-mpi -sNO_BZIP2=1 -sNO_ZLIB=1 install TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

1 0

unresolved external when building Boost.Thread
by Kenneth Riddile 25 Aug '10

25 Aug '10

OS - Windows7 x64 compiler - MSVC9 Boost version - 1.44 Running the following command fails to build the thread library with the following error: bjam variant=release link=shared threading=multi runtime-link=shared --layout=tagged install thread.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) pu blic: __thiscall boost::gregorian::greg_month::greg_month(unsigned short)" (__im p_??0greg_month@gregorian@boost@@QAE@G@Z) referenced in function "public: __this call boost::gregorian::date::date(enum boost::date_time::special_values)" (??0da te@gregorian@boost@@QAE@W4special_values@date_time@2@@Z) bin.v2\libs\thread\build\msvc-9.0\release\threading-multi\boost_thread-vc90-mt-1 _44.dll : fatal error LNK1120: 1 unresolved externals Removing "--layout=tagged" from the command results in the thread library building successfully, but of course that isn't what I want :)

2 1

Running mcgregor_common_subgraphs on a graph with bundled properties
by Saeed Nari 25 Aug '10

25 Aug '10

Hi, Is it possible to run mcgregor_common_subgraphs algorithm on a graph with bundled properties? Thanks Saeed

2 2

[MultiArray, Thread] Setting the _ITERATOR_DEBUG_LEVEL
by lfrfly＠icqmail.com 24 Aug '10

24 Aug '10

It's probably well-known by now that multi_array has a problem with Visual Studio 2010: due to the way it identifies its iterators, you get errors unless you set the _ITERATOR_DEBUG_LEVEL preprocessor symbol to 0. First of all, when can we expect a fix for this (or is there one already)? Secondly, even if I manually set the _ITERATOR_DEBUG_LEVEL to 0 in Debug configuration (that's the default in Release), I am unable to build because when I try to link in the Boost Thread library, I get 2>libboost_thread-vc100-mt-gd-1_43.lib(thread.obj) : error LNK2038: mismatch detected for '_ITERATOR_DEBUG_LEVEL': value '2' doesn't match value '0' in test.obj This indicates that I need to build Boost Thread with that variable set to 0 as well, even in the debug mode; or else I need to somehow get the Release version of the library linked in instead. I'm not sure how to do either one of these options. Can anyone help me configure bjam to override the variable, or else override which lib is linked?

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