February 2009 - Boost-users

Archive reload
by Ferllings 26 Feb '09

26 Feb '09

Hello, I have a Class A with string attributes that I serialize in XML format: Class A { public: string _nom; string _prenom; template<class Archive> void serialize(Archive& ar, const unsigned in version){ ar & boost::serialization::make_nvp("Nom", _nom); ar & boost::serialization::make_nvp("Prenom", _prenom); } } The object is correctly saved using this code: A _a; void save() const { ... oTextArchive::xml_oarchive oTextArchive(ofile); oTextArchive << make_nvp("A", _a); ... } But I want to reload the object, the A attributes aren't updated and keep the previous values: void load() { ... iTextArchive::xml_oarchive iTextArchive(ifile); iTextArchive >> make_nvp("A", _a); ... } The only way I found to reload my object is to use an temporary object: void load() { ... A _tmp; iTextArchive::xml_oarchive iTextArchive(ifile); iTextArchive >> make_nvp("A", _tmp); _a = _tmp; ... } Why can't I update the object directly? Thanks for your help.

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ERROR: `boost::archive::ARCHIVE_VERSION'
by niranjan bangera 26 Feb '09

26 Feb '09

Yes steven, i have include these: -I /boost_1_36_0/include/boost-1_36 -L/boost_1_36_0/lib -lboost_serialization-gcc41-mt -lpthread in the make file, Let me know if am wrong. Thanks for Reply, Thanks, niranjan > > > Message: 8 > Date: Wed, 25 Feb 2009 07:50:08 -0800 > From: Steven Watanabe <watanabesj(a)gmail.com> > Subject: Re: [Boost-users] ERROR: `boost::archive::ARCHIVE_VERSION' > To: boost-users(a)lists.boost.org > Message-ID: <49A568B0.6000900(a)providere-consulting.com> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > AMDG > > niranjan bangera wrote: > > Hi all, > > > > Boost Version: 1.38.0 > > ========== > > > > > Compiler:/_TOOLS_/dist/gnu-gcc-/4.1.1-binutils-2.16.1/x86_64-pc-linux2.4/bin/gcc > > ====== > > > > > > While running my test case i am getting following ERROR, I know this > > is linking Error, Please Help me to remove this. > > Are you linking to the serialization library? > > In Christ, > Steven Watanabe > > > > ------------------------------ > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > End of Boost-users Digest, Vol 1917, Issue 4 > ******************************************** >

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using Boost.Thread
by ayansinhas＠gmail.com 26 Feb '09

26 Feb '09

Hi All, I am new to boost library .. so apology if I am asking a silly question. We are planning to use boost thread in our project. We will like to know whether it is possible to use only Thread related files.. without installing the whole boost library?? Is there any way we can pull out only thread related files (some additional dependencies should be fine) in boost library and implement in our project. Please let us Know ASAP. Thanks in Advance Ayan.

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Re: [Boost-users] Boost-users Digest, Vol 1917, Issue 4
by niranjan bangera 26 Feb '09

26 Feb '09

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question about interprocess_condition::timed_wait
by Isaac Lascasas 26 Feb '09

26 Feb '09

I'm trying to use interprocess_condition::timed_wait without success. I never get the timeout in my code. I think I don't understand at all how posix_time works. My code is the following: ptime t = boost::posix_time::microsec_clock::local_time(); ptime timeout = t + milliseconds(1000); scoped_lock<interprocess_mutex> lock(InterprocessMutex, timeout); if (get_shared_data(lock).m_message) if (!InterprocessCondition.timed_wait(lock, timeout)) { // handle timeout } Is that ok? Thanks.

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Problem with boost::any?
by Germán Diago 26 Feb '09

26 Feb '09

Hello. I'm working with boost::any and shared_ptr. I'm implementing a plugin system which uses registration from .so files (under Linux). The problem is that I have a factory function which returns boost::any. This boost::any object holds a pointer type. The problem is that when I try to get the registered type back to its real type through boost::any_cast, the cast always fails. If I register this type in the same executable as the application, everything is ok, and I can cast back to its real type.I have no idea why this happens: template <class T> struct ObjectFactory { boost::any operator()() const { typedef typename T::interface_type it; it * t = new T(); return t; } }; #define REGISTER_EXTENSION_NODE(extensionpoint, ns) \ namespace { \ static const bool registeredextensionnode = \ ::Gtk::Util::PluginsManager::instance().register_extension_node(#ns "::" #extensionpoint, \ ::Gtk::Util::detail::ExtensionNodeFactory<ns::extensionpoint>()); \ } These are the implied parts of my application. If I use the macro from a .so, it fails. If I use it from the .exe, everything's ok. The registration part seems to work, I checked the size of the containers and so on, and the elements were inserted. Any help how could I solve this? I've been trying to debug the problem for almost 4 hours with no luck.

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Re: [Boost-users] [regex] Context-sensitive replacement of text usingregex_replace
by Neil Hunt 25 Feb '09

25 Feb '09

> > Hi Ken, what I suggest you do is look at the source for regex_replace: it's > actually a pretty simple application of of regex_iterator internally, it > should be fairly trivial to modify that to do what you want it to, > > HTH, John. > > Hi John, Having done something similar a number of times, I wonder if it would be worth implementing a variant of regex_replace where a functor is called that accepts the matched string and returns the replacement string. I think this is a common usage scenario. For example .NET regex's implement this. See http://msdn.microsoft.com/en-us/library/ht1sxswy.aspx Neil Hunt P.S. Thanks for the great library, and getting it into the C++ spec.

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[BGL] kamada_kawai_spring_layout
by Federico J. Fernández 25 Feb '09

25 Feb '09

Hi List, I'm trying to migrate some code from Graphviz to BGL Layout algorithms, but I don't know if the following feature is supported in the kamada_kawai_spring_layout. I want to "pin" or "stick" some nodes while letting the algorithm layout the rest of the graph. Is it possible? Thanks. -- federico

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sparse matrix resize()
by Ernest Turro 25 Feb '09

25 Feb '09

Hi, I've noticed that resize() with data preservation is not implemented for sparse matrices (matrix_sparse.hpp:2791). Does anyone have any suggestions on how to get around that? Many thanks, Ernest Run-time error: Check failed in file /opt/local/include/boost/numeric/ublas/ matrix_sparse.hpp at line 2791: !preserve terminate called after throwing an instance of 'boost::numeric::ublas::internal_logic' what(): internal logic Abort trap

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ERROR: `boost::archive::ARCHIVE_VERSION'
by niranjan bangera 25 Feb '09

25 Feb '09

Hi all, Boost Version: 1.38.0 ========== Compiler:/_TOOLS_/dist/gnu-gcc-/4.1.1-binutils-2.16.1/x86_64-pc-linux2.4/bin/gcc ====== While running my test case i am getting following ERROR, I know this is linking Error, Please Help me to remove this. ERROR: ====== test.o: In function `boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()': test.cpp:(.text._ZN5boost13serialization6detail27extended_type_info_typeid_0C2Ev[boost::serialization::detail::extended_type_info_typeid_0::extended_type_info_typeid_0()]+0x7): undefined reference to `boost::serialization::detail::extended_type_info_typeid_0::type_info_key' test.o: In function `boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::common_iarchive()': test.cpp:(.text._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEEC2Ev[boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::common_iarchive()]+0xd): undefined reference to `boost::archive::detail::basic_iarchive::basic_iarchive()' test.o: In function `boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::init()': test.cpp:(.text._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEE4initEv[boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::init()]+0x2f): undefined reference to `boost::archive::ARCHIVE_SIGNATURE' test.cpp:(.text._ZN5boost7archive6detail15common_iarchiveINS0_13text_iarchiveEE4initEv[boost::archive::detail::common_iarchive<boost::archive::text_iarchive>::init()]+0xd0): undefined reference to `boost::archive::ARCHIVE_VERSION' test.o: In function `boost::serialization::extended_type_info_typeid<Myclass const>::extended_type_info_typeid()': test.cpp:(.text._ZN5boost13serialization25extended_type_info_typeidIKN3ddr3DDREEC1Ev[boost::serialization::extended_type_info_typeid<Myclass const>::extended_type_info_typeid()]+0x23): undefined reference to `boost::serialization::extended_type_info::self_register()' test.o: In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()': test.cpp:(.text._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()]+0x14): undefined reference to `boost::archive::ARCHIVE_SIGNATURE' test.cpp:(.text._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEE4initEv[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::init()]+0x85): undefined reference to `boost::archive::ARCHIVE_VERSION' test.o: In function `boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::common_oarchive()': test.cpp:(.text._ZN5boost7archive6detail15common_oarchiveINS0_13text_oarchiveEEC2Ev[boost::archive::detail::common_oarchive<boost::archive::text_oarchive>::common_oarchive()]+0xd): undefined reference to `boost::archive::detail::basic_oarchive::basic_oarchive()' collect2: ld returned 1 exit status make[1]: *** [test] Error 1 make[1]: Leaving directory `test/TEST' make: *** [check-am] Error 2 Thanks, Niranjan

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