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recuring through / with boost filesystem
by brad＠16systems.com 30 Jun '08

30 Jun '08

Wondering if someone could suggest how to skip Linux Kernel related filesystems (like proc, sysFS stuff, etc) when using boost::filesystem to recurse thru / I've tried this: if (boost::filesystem::is_regular(itr->status()) && !boost::filesystem::is_empty(itr->path()) &&!boost::filesystem::symbolic_link_exists(itr->path())) But I still get hung up on some files in proc and sys. My goal is to read every readable file... starting at root. Silly goal, I know. Just experimenting with boost::filesystem. Any tips of clue-by-fours are appreciated. BTW, I can do this and it works: // Skip leafs with certain names. Leafs may be folders or files. if (itr->path().leaf() == "sys") { std::clog << "Skip: " << itr->path() << std::endl; continue; } But I'd like a more automated approach to skip these 'oddball' directories. Thanks, Brad

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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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