June 2008 - Boost-users - lists.preview.boost.org

Detecting cycles in graph
by Abde Ali Kagalwalla 30 Jun '08

30 Jun '08

Hi, I want to use the BFS to detect cycles in a graph I constructed using bundled vertex properties. I want a feature that as soon as I detect a cycle, I can do some processing on the cycle path and then go back to look for other cycles in the main graph. I am really confused with the documentation regarding BFSvisitor concepts. I would really appreciate some help regarding how to proceed with this. Thanks, Abde Ali

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Re: [Boost-users] Boost-users Digest, Vol 1676, Issue 2
by Martin Fisher 30 Jun '08

30 Jun '08

Can you try to include gil_all.hpp . I have compiled both examplessuccessfully in the past. But not with the most recent code. > Let me know if that works, > Christian > > On Sun, Jun 29, 2008 at 10:11 AM, Martin Fisher <mnfisher(a)tiscali.co.uk> wrote: > >> I'm trying to get the GIL examples to compile: using gcc 4.3.0 on a Fedora 9 >> system with a recent download of boost 1_35 >> >> So far I have tried mandelbrot and x_gradient - "as is" in each case. I get >> compilation errors at lines 46 and 160 of bit_aligned_pixel_reference.hpp: >> At line 46 >> bit_aligned_pixel_reference.hpp changes meaning of bit_range from class >> boost::gil::bit_range<boost::gil::bit_aligned_reference<B,C,L,M>::bit_size, >> isMutable>" >> and at line 160 - >> bit_aligned_pixel_reference.hpp declaration for const >> boost::gil::bit_aligned_pixel_reference<B,C,L,M>::bit_size,isMutable>&boost::gil::bit_aligned_pixel_refernce<B,C,L,M>::bit_range( >> ) const >> >> >> >> Including gil_all.hpp doesn't change things. Martin

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[date_time][doc] Gregorian date errors
by Edward Diener 30 Jun '08

30 Jun '08

In the generalized Gregorian date documentation it gives the year_month_day() function as returning a greg_ymd on the left side but a date::ymd_type on the right side. The right side is correct. In the same general Gregorian date documentation the right side example for day_of_week shows day() being used instead.

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[date_time][doc]
by Edward Diener 30 Jun '08

30 Jun '08

In the date_time documentation for class greg_year I read: boost::gregorian::greg_year — Represent a day of the month (range 1900 - 10000).

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[date_time]
by Edward Diener 30 Jun '08

30 Jun '08

I used a minimum set of functions in date_time in my VC9 code, but it appears to pull in the date/time DLL by asking for libboost_date_time-vc90-mt-gd-1_35.lib. I can not see where this is being generated but from looking at boost_date_time-vc90-mt-gd-1_35.dll I doubt I am using the functionality in it. Does anybody know why it is required ?

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Boost::Lexical_cast query
by Sean Farrow 29 Jun '08

29 Jun '08

Hi: Will Boost::Lexical_cast allow me to convert an std::sring to an std::bitset, and convert convert from std::bitset to WORD? Any help apreciated? Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3224 (20080627) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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_4 in Boost.Lambda ?
by Hui Li 29 Jun '08

29 Jun '08

How do I get _4, _5, etc out of Boost.Lambda? Currently I have only _1, _2, and _3 . Thanks.

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float serialization problem?
by michalurbanski 28 Jun '08

28 Jun '08

Hi, I get an error "error: no matching function for call to ‘load_wrapper(boost::archive::xml_iarchive&, const float&, boost::serialization::is_wrapper<float>" for the code of classes (1) and (2). The compiler output is in (3). The error comes from line "ar & BOOST_SERIALIZATION_NVP(constValue);" If I comment the line "BOOST_CLASS_EXPORT(ConstCellValueStrategy)" the code compiles fine, but while running I get a "terminate called after throwing an instance of 'boost::archive::archive_exception' what(): unregistered class". Any ideas what do I do wrong? Regards, MU. ----------------------------------------------------------------------- Attachment 1, the derived class: #ifndef CONSTCELLVALUESTRATEGY_HPP_ #define CONSTCELLVALUESTRATEGY_HPP_ #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/array.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/nvp.hpp> #include "CellValueStrategy.hpp" class ConstCellValueStrategy : public CellValueStrategy { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) const { ar & BOOST_SERIALIZATION_NVP(constValue); } float constValue; inline ConstCellValueStrategy() {} public: ConstCellValueStrategy(const float &constValue); float computeValue(const float& x); }; BOOST_CLASS_EXPORT(ConstCellValueStrategy) #endif /*CONSTCELLVALUESTRATEGY_HPP_*/ ----------------------------------------------------------------------- Attachment 2, The base abstract class: #ifndef CELLVALUESTRATEGY_HPP_ #define CELLVALUESTRATEGY_HPP_ #include <string> #include <boost/serialization/is_abstract.hpp> using namespace std; class CellValueStrategy { public: virtual float computeValue(const float& x) = 0; virtual ~CellValueStrategy() {}; }; BOOST_IS_ABSTRACT(CellValueStrategy) #endif /*CELLVALUESTRATEGY_HPP_*/ ----------------------------------------------------------------------- Attachment 3, the compilet output: Invoking: GCC C++ Compiler g++ -Isrc -I/usr/local/include/boost-1_35 -I../src -I../srcUTIL -I../srcGUI -I../srcCNN -IsrcUTIL -IsrcGUI -IsrcCNN -O0 -msse -g3 -pg -Wall -pg -c -fmessage-length=0 -ansi -pedantic -DPNG_NO_MMX_CODE -I/usr/include/gtkmm-2.4 -I/usr/lib/gtkmm-2.4/include -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/gdkmm-2.4 -I/usr/lib/gdkmm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/include/atkmm-1.6 -I/usr/include/gtk-2.0 -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/gtk-2.0/include -I/usr/include/cairomm-1.0 -I/usr/include/pango-1.0 -I/usr/include/cairo -I/usr/include/freetype2 -I/usr/include/libpng12 -I/usr/include/atk-1.0 -MMD -MP -MF"srcUTIL/ConstCellValueStrategy.d" -MT"srcUTIL/ConstCellValueStrategy.d" -o"srcUTIL/ConstCellValueStrategy.o" "../srcUTIL/ConstCellValueStrategy.cpp" /usr/local/include/boost-1_35/boost/archive/detail/iserializer.hpp: In function ‘void boost::archive::load(Archive&, const T&) [with Archive = boost::archive::xml_iarchive, T = float]’: /usr/local/include/boost-1_35/boost/archive/detail/common_iarchive.hpp:59: instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = const float, Archive = boost::archive::xml_iarchive]’ /usr/local/include/boost-1_35/boost/archive/basic_xml_iarchive.hpp:81: instantiated from ‘void boost::archive::basic_xml_iarchive<Archive>::load_override(const boost::serialization::nvp<T>&, int) [with T = const float, Archive = boost::archive::xml_iarchive]’ /usr/local/include/boost-1_35/boost/archive/xml_iarchive.hpp:74: instantiated from ‘void boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T = const boost::serialization::nvp<const float>, Archive = boost::archive::xml_iarchive]’ /usr/local/include/boost-1_35/boost/archive/detail/interface_iarchive.hpp:63: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const boost::serialization::nvp<const float>, Archive = boost::archive::xml_iarchive]’ /usr/local/include/boost-1_35/boost/archive/detail/interface_iarchive.hpp:70: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator&(T&) [with T = const boost::serialization::nvp<const float>, Archive = boost::archive::xml_iarchive]’ ../srcUTIL/ConstCellValueStrategy.hpp:16: instantiated from ‘void ConstCellValueStrategy::serialize(Archive&, unsigned int) const [with Archive = boost::archive::xml_iarchive]’ /usr/local/include/boost-1_35/boost/serialization/access.hpp:109: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_iarchive, T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/serialization.hpp:81: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_iarchive, T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/serialization.hpp:140: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::xml_iarchive, T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/archive/detail/iserializer.hpp:314: instantiated from ‘boost::archive::detail::pointer_iserializer<Archive, T>::pointer_iserializer() [with Archive = boost::archive::xml_iarchive, T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/archive/detail/dynamically_initialized.hpp:39: instantiated from ‘static T& boost::archive::detail::dynamically_initialized<T>::get_instance() [with T = boost::archive::detail::pointer_iserializer<boost::archive::xml_iarchive, ConstCellValueStrategy>]’ /usr/local/include/boost-1_35/boost/archive/detail/dynamically_initialized.hpp:33: instantiated from ‘boost::archive::detail::pointer_iserializer<boost::archive::xml_iarchive, ConstCellValueStrategy>& boost::archive::detail::dynamically_initialized<boost::archive::detail::pointer_iserializer<boost::archive::xml_iarchive, ConstCellValueStrategy> >::instance’ /usr/local/include/boost-1_35/boost/archive/detail/iserializer.hpp:330: instantiated from ‘static const boost::archive::detail::pointer_iserializer<Archive, T>& boost::archive::detail::pointer_iserializer<Archive, T>::get_instance() [with Archive = boost::archive::xml_iarchive, T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/export.hpp:59: instantiated from ‘static const boost::archive::detail::basic_pointer_iserializer& boost::archive::detail::export_impl<Archive, Serializable>::enable_load(mpl_::true_) [with Archive = boost::archive::xml_iarchive, Serializable = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/export.hpp:138: instantiated from ‘static void boost::archive::detail::ptr_serialization_support<Archive, Serializable>::instantiate() [with Archive = boost::archive::xml_iarchive, Serializable = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/export.hpp:125: instantiated from ‘boost::archive::detail::ptr_serialization_support<boost::archive::xml_iarchive, ConstCellValueStrategy>’ /usr/local/include/boost-1_35/boost/archive/detail/register_archive.hpp:21: instantiated from ‘boost::archive::detail::_ptr_serialization_support<boost::archive::xml_iarchive, ConstCellValueStrategy>’ /usr/local/include/boost-1_35/boost/serialization/export.hpp:101: instantiated from ‘boost::archive::detail::guid_initializer<T>::guid_initializer(const char*) [with T = ConstCellValueStrategy]’ /usr/local/include/boost-1_35/boost/serialization/export.hpp:84: instantiated from ‘static const boost::archive::detail::guid_initializer<T>& boost::archive::detail::guid_initializer<T>::get_instance(const char*) [with T = ConstCellValueStrategy]’ ../srcUTIL/ConstCellValueStrategy.hpp:27: instantiated from here /usr/local/include/boost-1_35/boost/archive/detail/iserializer.hpp:589: error: no matching function for call to ‘load_wrapper(boost::archive::xml_iarchive&, const float&, boost::serialization::is_wrapper<float>)’ make: *** [srcUTIL/ConstCellValueStrategy.o] Error 1 make: *** Waiting for unfinished jobs.... Finished building: ../srcGUI/CNNMainWindow.cpp

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Binary archive compatibility between 1_35_0 & 1_36_trunk...
by Mathieu Peyréga 28 Jun '08

28 Jun '08

Hello, I recently (yesterday) "upgraded" to 1_36_trunk version and have trouble with binary archives which are no more readable by the framework... I am using Visual Studio 2005 on Vista I have a Project object embedding a MeteoStation object.... The framework is able to load previous MeteoStation files saved in binary format... but is not able to loas a project object embedding a MeteoStation object (not a pointer or reference : whole object)... and the problem occurs while loading this MeteoStation object... on the Name field which is a std::string... (MeteoStation have a BOOST_SERIALIZATION_SPLIT_MEMBER() in case it does matter) The issue occurs in the <boost/archive/impl/basic_binary_iprimitive.ipp> line 91 template<class Archive, class Elem, class Tr> BOOST_ARCHIVE_OR_WARCHIVE_DECL(void) basic_binary_iprimitive<Archive, Elem, Tr>::load(std::string & s) {... where the load method which i I guess supposed to return the size of the object returns a pretty "exotic value" and mess-up the following... I hope this helps to solve some issue... and may answer more questions if needed... regards, Mathieu -- http://www.incub.net/

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boost.interprocess shared memory & stability when a linked application terminates abnormally
by Bijan 27 Jun '08

27 Jun '08

What would happen when a linked application to a shared memory terminates abnormally while it is in the middle of memory allocation or any other structural changes? I guess it could corrupt the whole shared memory and also stability of the other linked applications. Some shared-memory based databases like TimesTen have a mechanism called MicroLogging to protect integrity of the shared memory. Here is a quote from Oracle TimesTen: "Oracle TimesTen protects its shared libraries against application process failures by means of its patented “MicroLogging” algorithm. Consequently, the abnormal termination of a linked application will not affect Oracle TimesTen IMDB's and even other related applications."

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