August 2014 - Boost-users - lists.preview.boost.org

[Serialization] 1.56.0 - unregistered_class exception while using EXPORTs
by Todd Seiler 20 Aug '14

20 Aug '14

I've been pulling my hair out for a couple of days trying to get this to work. When I serialize something from a base pointer, it throws an "unregistered_class" exception. I know the type of object that's being serialized and that class has "BOOST_CLASS_EXPORT_KEY" in the header and "BOOST_CLASS_EXPORT_IMPLEMENT" in the cpp file with the same name. In the save and load functions I also have: boost::serialization::void_cast_register( static_cast<Derived*>(NULL), static_cast<Base*>(NULL)); The base class is an abstract base class with one pure virtual function method. But here are the differences: 1) I tried using the "ASSUME_ABSTRACT....." macro. That didn't do anything for me. 2) The abstract base class also has a cpp file with some code in it. I'm not sure if that matters or not... Here's the thing. I can get the derived class's "save" method to be called with this code: std::ofstream o(case_path_ + "/" + file_name); if (o.good()) { // MUST HAVE THIS boost::serialization::void_cast_register<Derived, Base>( static_cast<Derived*>(NULL), static_cast<Base*>(NULL)); boost::archive::polymorphic_text_oarchive oa(o); boost::archive::polymorphic_oarchive & oa_interface = oa; oa_interface << base_ptr; } Having the void_cast_register() there sort of defeats the purpose though. I shouldn't need to pre-register them. In all the examples, I see the void_cast_register() inside of the "save" and "load" methods, which is what I have already. All my serialization code resides in cpp files. Also, the serialization code resides in a static lib. But the archive creation and the action to serialize is performed in a dynamic lib. I am also using polymorphic archives everywhere. I've also forced template instantiation of all serialization code and polymorphic archive interface stuff. Any clue?

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[Serialization] 1.56.0 - How to serialize polymorphic base class data without derived data
by Todd Seiler 20 Aug '14

20 Aug '14

Basically, I'm looking to serialize a base class that's polymorphic, from a base class pointer, without it calling the derived class's serialize functions... Here is my setup: class RenderableMesh : public BasicMesh, public DynamicRenderable; Basically, I don't want it to serialize RenderableMesh or DynamicRenderable given a "basicMesh" pointer. The reason is because "DynamicRenderable" derives from a class inside the "Ogre3D" engine which does a bunch of memory management automatically. Basically, when I compile, it tells me it's missing operator delete, because Ogre overloads operator new or something I don't completely understand... I'm okay with serializing the BasicMesh, and then just recreating the RenderableMesh when it's deserialized. Which is what I'm going to have to do anyways because I don't want to change the Ogre3D SDK header files. It's probably super simple... If I don't implement it, it complains telling me the derived class is not registered... Which is correct. If I try to implement, it says operator delete is missing. Any ideas?

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[build] Cannot build from develop anymore
by Marcel Raad 19 Aug '14

19 Aug '14

Hi, last time I tried to build Boost from develop (a few weeks ago) with MSVC, it worked perfectly. Now I get the following errors on two different Windows 7 machines with both MSVC14 CTP3 and MSVC12.3: boost/tools/build/src/build\virtual-target.jam:1099: in virtual- target.register-actual-name from module virtual-target error: Duplicate name of actual target: <pstage\lib>libboost_system-vc140- mt-1_57.lib error: previous virtual target { common%common.copy-libboost_system-vc140- mt-1_57.lib.STATIC_LIB { msvc%msvc.archive-libboost_system-vc140- mt-1_57.lib.STATIC_LIB { msvc%msvc.compile.c++-error_code.obj.OBJ { error_code.cpp.CPP } } } } error: created from ./stage-proper error: another virtual target { common%common.copy-libboost_system-vc140- mt-1_57.lib.STATIC_LIB { msvc%msvc.archive-libboost_system-vc140- mt-1_57.lib.STATIC_LIB { msvc%msvc.compile.c++-error_code.obj.OBJ { error_code.cpp.CPP } } } } error: created from ./stage-proper error: added properties: <asynch-exceptions>on error: removed properties: <asynch-exceptions>off boost/tools/build/src/build\virtual-target.jam:484: in actualize-no-scanner from module object(file-target)@14375 boost/tools/build/src/build\virtual-target.jam:134: in class@virtual- target.actualize from module object(file-target)@14375 boost/tools/build/src\build-system.jam:720: in load from module build-system boost\tools\build\src/kernel\modules.jam:289: in import from module modules boost\tools\build\src/kernel/bootstrap.jam:139: in boost-build from module boost\boost-build.jam:17: in module scope from module Does anyone have any idea what Boost.Build is trying to tell me?

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Re: [Boost-users] boost serialisation, just including shared_ptr.hpp causes compile error on Linux/gcc 4.5
by avib369 . 19 Aug '14

19 Aug '14

Adding the two missing includes has indeed fixed the problem, as suggested in https://svn.boost.org/trac/boost/ticket/10348 #include <boost/serialization/singleton.hpp> #include <boost/serialization/extended_type_info.hpp> Thanks, Avi

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support for OpenMPI 64bit in modular-boost?
by Alle Meije Wink 19 Aug '14

19 Aug '14

Using the git repository (currently 1.57) of modular boost in Windows 7, compiling with MinGW64 and masm/ml64 (from the WDK v7) is successful but with the following warnings at the start: (1) warning: Graph library does not contain MPI-based parallel components. note: to enable them, add "using mpi ;" to your user-config.jam (2) warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. warning: No python installation configured and autoconfiguration note: failed. See http://www.boost.org/libs/python/doc/building.html note: for configuration instructions or pass --without-python to note: suppress this message and silently skip all Boost.Python targets After installing Open MPI 64-bit ( Windows installer of version 1.6.2 http://www.open-mpi.org/software/ompi/v1.6/downloads/OpenMPI_v1.6.2-2_win64… ), including adding it to the system-wide path, I have tried to re-build boost with MPI by, after running bootstrap gcc adding the line using mpi ; to the file project-config.jam in the boost directory (there is no file user-config.jam or a directory tools/build/v2 in the latest version or so it seems). Now the b2 command produces this output: The system cannot find the path specified. The system cannot find the path specified. The system cannot find the path specified. The system cannot find the path specified. The system cannot find the path specified. MPI auto-detection failed: unknown wrapper compiler mpic++ Please report this error to the Boost mailing list: http://www.boost.org You will need to manually configure MPI support. It continues to build the boost libraries, but still without MPI support. I am advised to manually configure MPI, but I'm pretty sure that is what I have just done. (the binaries are in the directory C:\Users\amwink\usr\local\OpenMPI_v1.6.2-x64\bin -- no spaces) Does anyone know what the problem is here? Is something wrong with this particular mpic++ binary that boost cannot handle? Happy to provide outputs/logs if that helps.

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boost serialisation, just including shared_ptr.hpp causes compile error on Linux/gcc 4.5
by avib369 . 18 Aug '14

18 Aug '14

I did not see boost serialisation in the list of lib that had changed. So its surprising that it now broken ? It appears simply including it cause problems #include <boost/serialization/shared_ptr.hpp> cause gcc.compile.c++ bin/gcc-4.5/debug/test/TestStr.o In file included from /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr.hpp:28:0, from test/TestStr.cpp:27: /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp: In static member function ‘static const boost::serialization::extended_type_info* boost::serialization::shared_ptr_helper<SPT>::non_polymorphic::get_object_type(U&)’: /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:107:22: error: ‘singleton’ is not a member of ‘boost::serialization’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:110:13: error: expected ‘(’ before ‘>’ token /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:110:14: error: ‘::get_const_instance’ has not been declared /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp: In static member function ‘static const boost::serialization::extended_type_info* boost::serialization::shared_ptr_helper<SPT>::polymorphic::get_object_type(U&)’: /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:117:20: error: ‘singleton’ is not a member of ‘boost::serialization’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:120:13: error: expected ‘(’ before ‘>’ token /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:120:14: error: ‘::get_const_instance’ has not been declared /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp: In member function ‘void boost::serialization::shared_ptr_helper<SPT>::reset(SPT<T>&, T*)’: /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:152:30: error: invalid use of incomplete type ‘const struct boost::serialization::extended_type_info’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:42:7: error: forward declaration of ‘const struct boost::serialization::extended_type_info’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:167:30: error: invalid use of incomplete type ‘const struct boost::serialization::extended_type_info’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:42:7: error: forward declaration of ‘const struct boost::serialization::extended_type_info’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:168:30: error: invalid use of incomplete type ‘const struct boost::serialization::extended_type_info’ /var/tmp/ma0/boost/boost_1_56_0/boost/serialization/shared_ptr_helper.hpp:42:7: error: forward declaration of ‘const struct boost::serialization::extended_type_info’ "g++" -ftemplate-depth-128 -fPIC -O0 -fno-inline -Wall -g -fPIC -DDEBUG -I"../ACore/src" -I"/var/tmp/ma0/boost/boost_1_56_0" -c -o "bin/gcc-4.5/debug/test/TestStr.o" "test/TestStr.cpp" Are there any workarounds ? Ta, Avi

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[BGL] Algorithm Objects
by Pierre Talbot 18 Aug '14

18 Aug '14

Hello, In the BGL documentation (challenge section, see http://www.boost.org/doc/libs/1_56_0/libs/graph/doc/challenge.html) a bullet point is: "Explore the use of Algorithm Objects as an alternative to the current approach with visitors." Do you have any links or explanations about the "Algorithm Objects" concept? Thanks, Pierre Talbot

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Boost.Xpressive
by Goran 17 Aug '14

17 Aug '14

Hi all, I'll have to check large CSV text files (up to several GB) and check them with Xpressive. As far as I can see, the only way to do is to load the whole file into a std::string and hand over to Xpressive. I don't want to do that because my files are too big. So, how can I open a CSV file in text mode, get bidirectional iterators and hand them over to Xpressive? Regards Goran

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[Serialization] 1.56.0 - polymorphic archive saving std::shared_ptr<>, no member named "get_helper"
by Todd Seiler 17 Aug '14

17 Aug '14

I'm trying to serialize a std::shared_ptr using a polymorphic archive interface, but it complains about no "get_helper". Specifically clang states: "<removed_for_posting>/boost_1_56_0/boost/serialization/shared_ptr.hpp:253:21: No member named 'get_helper' in 'boost::archive::polymorphic_iarchive'" I tried including "boost/serialization/shared_ptr_helper.hpp", but this didn't seem to have what I needed. I did see the new stuff in "boost/serialization/shared_ptr.hpp" regarding std::shared_ptr<>, so I'm hopeful. Most of what I'm doing requires the serialization code to be inside of dll's or dylibs, so I believe I'm going down the correct path in using polymorphic archives... void save(std::shared_ptr<developer> p) { std::ofstream of("archiv.txt"); boost::archive::polymorphic_text_oarchive oa(of); boost::archive::polymorphic_oarchive & oa_interface = oa; oa_interface << p; } void load() { std::ifstream i("archiv.txt"); boost::archive::polymorphic_text_iarchive ia(i); boost::archive::polymorphic_iarchive & ia_interface = ia; std::shared_ptr<developer> p; ia_interface >> p; std::cout << p->getName() << std::endl; std::cout << p->age() << std::endl; std::cout << p->language() << std::endl; std::cout << p->getLangVer() << std::endl; } The compiler error specifically points to this function in shared_ptr.hpp template<class Archive, class T> inline void load( Archive & ar, std::shared_ptr< T > &t, const unsigned int /*file_version*/ ){ // The most common cause of trapping here would be serializing // something like shared_ptr<int>. This occurs because int // is never tracked by default. Wrap int in a trackable type BOOST_STATIC_ASSERT((tracking_level< T >::value != track_never)); T* r; ar >> boost::serialization::make_nvp("px", r); boost::serialization::shared_ptr_helper<std::shared_ptr> & h = ar.template get_helper< shared_ptr_helper<std::shared_ptr> >(); h.reset(t,r); } Any suggestions?

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Do not understand about creating a vector of vector using Boost::interprocess libraries
by 张国熙 16 Aug '14

16 Aug '14

Dear everyone, I've just begun learning to use IPC in boost. Here I want to create a vector of vector<std::complex<double>>, that is to say, a matrix of complex. I read the section "containers of containers" in manual, and try to write something as the following: #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/managed_shared_memory.hpp> #include <complex> typedef boost::interprocess::allocator<std::complex<double>, boost::interprocess::managed_shared_memory::segment_manager> ComplexAllocator; typedef boost::interprocess::vector<std::complex<double>,ComplexAllocator> ComplexVector; typedef boost::interprocess::allocator<ComplexVector, boost::interprocess::managed_shared_memory::segment_manager> ComplexVectorAllocator; typedef boost::interprocess::vector<ComplexVector,ComplexVectorAllocator> ComplexMatrix; int main () { struct shm_remove { shm_remove() { boost::interprocess::shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ boost::interprocess::shared_memory_object::remove("MySharedMemory"); } } remover; boost::interprocess::create_only_t tag; boost::interprocess::managed_shared_memory segment(tag, "MySharedMemory", 65536); const ComplexVectorAllocator alloc_inst (segment.get_segment_manager()); ComplexMatrix *m = segment.construct<ComplexMatrix> ("M")(alloc_inst); m->resize(4); segment.destroy<ComplexMatrix>("M"); return 0; } However, it could not compile. And the error message is too long for me to understand. Is there anyone knowing how to fix this? Best wishes, Guoxi

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