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[GIL] convert image view to const image view
by Curtis Gehman 21 Dec '10

21 Dec '10

I originally hoped that an actual function argument of type GIL mutable image view (e.g., gray8_view_t) would be automatically promoted to a (immutable or const) view (e.g., gray8c_view_t). But my experience (with version 1.44.0) indicates otherwise. It also seems like the const_view function, which generates a (const) view from an image is not overloaded to do the same using a mutable view. Obviously, I'm just getting starting using GIL, since this sort of conversion would, I presume, be used often. I've been searching the online documentation without success. Can someone point me to the answer for this basic task? In the meantime, I'll be reading the GIL header files. Thanks.

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Basics: Boost.Interprocess and Boost.MPI
by Fred Lawton 20 Dec '10

20 Dec '10

I am a newbie looking for guidance using Boost libraries regarding shared-memory and parallel processing. First, my task is to run two programs at the same time that need to share a data structure. Which boost libraries will help me? Also, any clarification between parallel processing, multi-thread processing, and shared-memory would be greatly appreciated. Thanks!

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named pipes in boost for Linux
by rohini chandra pallapothu 20 Dec '10

20 Dec '10

Hi, Could anyone please let me know if named pipes are implemented in boost for Linux for communication between two processes which are not child and parent. I could not find in the documentation that named pipes are implemented so far. Is there information that they will be implemented in future versions. Please let me know if my query is not clear. Regards, Rohini Chandra

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crash in boost serialization (1.44)
by rico.cadetg＠noser.com 20 Dec '10

20 Dec '10

Hello, I’ve noticed a crash (accessing a null pointer) inside the boost serialization (version 1.44). I use visual studio 2005, the code to serialize is in a Dll. I have a small visual studio solution that reproduces the crash, I guess it is a bug and should cause a crash in other environments as well. I have the following classes INode (Interface) Node (Abstract, derived from INode) LeafNode(derived from Node) TableNode(derived from Node) The TableNode has a list of INode*, the children. A TableNode itself can be a child of a TableNode. All classes are inside a Dll and correctly exported (I have no “unregistered class” exceptions). If I create a TableNode with some entries including another TableNode and serialize it as an object, I get the crash when trying to deserialize later. If I do the same, but serialize the parent TableNode as a pointer, it works. I guess the serialization framework does not recognize that a TableNode gets serialized through a pointer and therefore the object tracking does not work correctly. I can send the example solution if needed. The crash is in the basic_iarchive.cpp, line 456 (bpis_ptr is null): if(! tracking){ bpis_ptr->load_object_ptr(ar, t, co.file_version); } Best regards, Rico

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ublas matrix from another data pointer
by Eloi Du Bois 20 Dec '10

20 Dec '10

Hi everybody, I would like to know if there is a way to get a ublas matrix from a given data pointer. Here follows what I tried: inline boost::numeric::ublas::matrix<double, boost::numeric::ublas::column_major> cvToUblasMat( CvMat & m ) { using namespace boost::numeric::ublas; return matrix<double, column_major>( m.rows, m.cols, shallow_array_adaptor<double>( m.rows * m.cols, m.data.db ) ); } Thank you for helping... -Eloi du Bois.

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Serialization linker error: wstring and libcpmt.lib
by Justin 20 Dec '10

20 Dec '10

Hi guys, I have just started to use boost::serialization to serialize a complex data structure in a VS2005 MFC project. I'm still very unfamiliar with boost but i need to get this done by then end of the day. I ran into a couple of linker errors during compilation: error LNK2005: "public: unsigned int __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::size(void)const " (?size@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QBEIXZ) already defined in msvcprt.lib(MSVCP80.dll) libcpmt.lib there are 24 others of the similar error. If i ignore libcpmt.lib in the linker options, it'll *solve* the errors but is this the correct method? error LNK2019: unresolved external symbol "public: void __thiscall boost::archive::text_iarchive_impl<class boost::archive::text_iarchive>::load(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > &)" (?load@?$text_iarchive_impl@Vtext_iarchive@archive@boost@@@archive@boost@@QAEXAAV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@@Z) referenced in function "public: class boost::archive::text_iarchive & __thiscall boost::archive::detail::interface_iarchive<class boost::archive::text_iarchive>::operator>><class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > >(class std::basic_string<unsigned short,struct std::char_traits<unsigned short>,class std::allocator<unsigned short> > &)" (??$?5V?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@@?$interface_iarchive@Vtext_iarchive@archive@boost@@@detail@archive@boost@@QAEAAVtext_iarchive@23@AAV?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@@Z) this error is cause by the use of std::wstring inside my data structure. if i change it to std::string then it'll compile fine. My data structure: std::vector<DrvCfgData> DrvData; struct DrvCfgData { std::wstring ServerName; DWORD IPAddr; int PollRate; std::list<RptData> Reporting; } struct RptData { std::wstring RptName; std::wstring RptId; std::wstring RptData; std::wstring RptOps; bool param1; int param1data; bool param2; std::string param2data; bool param3; int param3data; bool param4; int param4data; } I've included the following header files in my project: #include <boost/serialization/vector.hpp> #include <boost/serialization/list.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> Please advise. Thanks. justin

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serialization: "derived class not registered or exported" exception , 1.45 boost
by Hicham Mouline 19 Dec '10

19 Dec '10

Hello, I have moved all serialization code in a separate static library that I called serialization. This, in my case, depends on mpi. The headers in this static library: 1. include <boost/serialization/export.hpp> 2. include the definition of the derived class being serialized 3. declare a template function serialize() that takes a reference to the derived class being serialized in the boost::serialization namespace 4. invoke the BOOST_CLASS_EXPORT_KEY(<derivedclass>) macro at the global namespace scope The corresponding source files in this static library: 1. include the header 2. define the function template serialize() 3. explicitly instantiate the serialize() function with all the archives used: mpi::packed_iarchive and mpi::packed_oarchive in the boost::serialization namespace 4. invoke the BOOST_CLASS_EXPORT_IMPLEMENT(<derivedclass>) macro at the global namespace scope The main program links against this static library, and invokes a mpi function (broadcast) that serializes by the base pointer. The base class is polymorphic. All class derivations are public. Debugging, the code reaches : archive/detail/oserializer.hpp boost::archive::detail::save_pointer_type<boost::mpi::packed_oarchive>::poly morphic::save<baseclass>(boost::mpi::packed_oarchive & ar={...}, baseclass& t={...}) Line 400 + 0x38 bytes where NULL==true_type However, looking at the t argument of save(), it shows that is the correct derived object. But the type T is the base class. What am I missing? regards,

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1.45 download sourceforge corrupt
by Hicham Mouline 19 Dec '10

19 Dec '10

hello. has anyone downloaded 1.45 archives from sourceforge recently. I've downloaded the 4 formats and all of them appear corrupt to 7zip and winrar on windows I've tried 2 different mirrors rds,

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mpi: what is the archive used when serializing the objects send by mpi functions?
by Hicham Mouline 19 Dec '10

19 Dec '10

Hello, I may need to instantiate all the serialize() template functions in 1 library in my project. What is the archive type(s) that mpi uses so that I can explicitly instantiate that template function? regards,

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RAD Studio XE and boost library
by Christer Borgqvist 19 Dec '10

19 Dec '10

Hi, Date and Time Formatted Input and Output Try to use a sample like this #include <boost/date_time/gregorian/gregorian.hpp> #include <iostream> #include <locale> int main() { boost::gregorian::date d(2009, 1, 7); boost::gregorian::date_facet *df = new boost::gregorian::date_facet("%A, %d %B %Y"); std::cout.imbue(std::locale(std::cout.getloc(), df)); std::cout << d << std::endl; } When compile I get [BCC32 Error] Unit1.cpp(86): E2316 'date_facet' is not a member of 'boost::gregorian' Appreciate any help. //Christer

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