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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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symbian port?
by Gustavo Garcia Bernardo 25 Feb '09

25 Feb '09

Is it possible to build boost libraries for the symbian platform? Thank you, G.

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[boost-users][StateChart] event creation/destruction
by Igor R 25 Feb '09

25 Feb '09

Hello, In my application I use a few async state-machines with lots of events. I'd like to trace some events construction/destruction balance, so I define them as follows: volatile long eventCount; template<class MostDerived> struct EvBase : sc::event<MostDerived> { EvBase() { long c = InterlockedIncrement(&eventCount); somelog << c << std::endl; } ~EvBase() { long c = InterlockedDecrement(&eventCount); somelog << c << std::endl; } }; // inherit EvBase directly struct Ev1 : EvBase<Ev1> {}; struct Ev2 : EvBase<Ev2> {}; struct Ev3 : EvBase<Ev3> {}; // inherit EvBase indirectly template<class MostDerived> struct EvIntermediate : EvBase<MostDerived> {}; struct Ev4 : EvIntermediate<Ev4> {}; When I run the application, I see that at some stage the counter goes negative, and its tendency is to get more and more negative. I guess I don't realize something important about the sc::event, so I'd appreciate enlightment on this. Thanks, Igor'.

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Re: [Boost-users] [accumulators] Strange behavior while extracting min using UDT
by dhruva 25 Feb '09

25 Feb '09

Hello, I found the solution. I had to specialize the min and max as follows for my UDT. It now works as it always did :) acc_sample std::numeric_limits<acc_sample>::min() { return (acc_sample(1000, std::numeric_limits<double>::min())); } acc_sample std::numeric_limits<acc_sample>::max() { return (acc_sample(1000, std::numeric_limits<double>::max())); } -dhruva From Chandigarh to Chennai - find friends all over India. Go to http://in.promos.yahoo.com/groups/citygroups/

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