December 2010 - Boost-users - lists.preview.boost.org

[serialization] serialize std::unique_ptr
by Dmitry Vinogradov 21 Dec '10

21 Dec '10

Does there exists a common way to serialize std::unique_ptr?

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Boost.Log build problem
by Anand Arumugam 21 Dec '10

21 Dec '10

Hello All, I installed Boost v1.42 that was available from Synaptic Package Manager in Xubuntu 10.10. Downloaded the Boost.Log library from sourceforge and extracted it under /usr/include/boost. From the command line I issued the following to build it: bjam --with-log variant=release stage And got this as output: notice: could not find main target stage notice: assuming it's a name of file to create /usr/share/boost-build/build/project.jam:699: in attribute warning: rulename $($(project).attributes).get expands to empty string /usr/share/boost-build/build/project.jam:709: in project.target /usr/share/boost-build/build-system.jam:395: in load /usr/share/boost-build/kernel/modules.jam:261: in import /usr/share/boost-build/kernel/bootstrap.jam:132: in boost-build /usr/share/boost-build/boost-build.jam:1: in module scope /usr/share/boost-build/build/project.jam:699: in project.attribute warning: rulename $($(project).attributes).get expands to empty string /usr/share/boost-build/build/targets.jam:203: in object(project-target)(a)36.__init__ /usr/share/boost-build/kernel/class.jam:93: in new /usr/share/boost-build/build/project.jam:709: in project.target /usr/share/boost-build/build-system.jam:395: in load /usr/share/boost-build/kernel/modules.jam:261: in import /usr/share/boost-build/kernel/bootstrap.jam:132: in boost-build /usr/share/boost-build/boost-build.jam:1: in module scope /usr/share/boost-build/build/project.jam:699: in project.attribute warning: rulename $($(project).attributes).get expands to empty string /usr/share/boost-build/build/targets.jam:222: in get /usr/share/boost-build/build/targets.jam:284: in targets-to-build /usr/share/boost-build/build/targets.jam:253: in object(project-target)(a)36.generate /usr/share/boost-build/build-system.jam:414: in load /usr/share/boost-build/kernel/modules.jam:261: in import /usr/share/boost-build/kernel/bootstrap.jam:132: in boost-build /usr/share/boost-build/boost-build.jam:1: in module scope /usr/share/boost-build/build/project.jam:699: in project.attribute warning: rulename $($(project).attributes).get expands to empty string /usr/share/boost-build/build/targets.jam:222: in get /usr/share/boost-build/build/targets.jam:285: in targets-to-build /usr/share/boost-build/build/targets.jam:253: in object(project-target)(a)36.generate /usr/share/boost-build/build-system.jam:414: in load /usr/share/boost-build/kernel/modules.jam:261: in import /usr/share/boost-build/kernel/bootstrap.jam:132: in boost-build /usr/share/boost-build/boost-build.jam:1: in module scope don't know how to make <e>stage ...found 1 target... ...can't find 1 target... I found a similar help request at: http://lists.boost.org/boost-build/2007/06/16748.php but I want to know whether what I am doing is correct - that is trying to build one library from source (that is not officially part of boost), while installing all other boost libraries from a package manager? In /usr/lib all the other boost static and shared libraries are installed. Thank you for your time. cheers, Anand.

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Re: [Boost-users] Boost-users Digest, Vol 2579, Issue 2
by Bogdan Cristea 21 Dec '10

21 Dec '10

On Tuesday 21 December 2010 11:55:23 boost-users-request(a)lists.boost.org wrote: > Hmm, looking into thread.cpp implementation of thread_proxy (callback > function for pthread_create()) and boost::thread::join I do not see how > this join implementation would work with any abnormal thread termination. > In thread.cpp boost::thread::join waits the thread termination on line: > local_thread_info->done_condition.wait(lock); > > The lock gets signaled only at end of thread_proxy(), which is reached > only if the user thread routine does "return" or is interrupted with > boost::thread means. pthread_exit(), as well as any other emergency > termination does only stack unwinding (on most but not all systems), so > done_condition is simply never signaled in these circumstances. To be > correct the thread_proxy() should have installed cleanup routine with > pthread_cleanup_push() and, to be sure, have an local object which > destructor would signal done_condition as well, but I do not see it in > boost::thread code. > > Bogdan, when you said, the test program works for you - did you means it > does return with status 0? If so, I wonder, which way the execution goes > in your thread_proxy implementation - can you please debug it a little if > you have some time? To build debug version of boost you need to add > "variant=debug" option to bjam. I tried the same test program on ubuntu > 10.04 TLS with gcc 4.4.3 and boost 1.40 - the same result as with latest > boost: it freezes in boost::thread::join() on condition.wait(). Hi pthread_exit() is used to pass data to the parent thread at exit. pthread_join() should receive this data to its second parameter. I will try to have a closer look, but I doubt that boost doesn't handle correctly such situation. regards Bogdan

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quickbook syntaxhighlighting in katepart
by Wilhelm 21 Dec '10

21 Dec '10

Hi, I tried to get the syntaxhighlighting for kate working, but with no success. I copied the *.xml files with the highlighting definitions to the katepart/syntax directory (both for kate-3 and kate-4), but nothing changed opening *.qbk files. Any hints? -- Wilhelm

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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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