- Boost-users - lists.boost.org

Re: [Boost-users] [thread] assertion error in timed_lock
by Ernst Murnleitner 14 Jan '09

14 Jan '09

Dear Anthony, > > pthread_mutex_timedlock returned ETIMEDOUT. > > This bug has already been fixed. > Of cource, bugs happen. I used boost 1.36.0. Is the fix in 1.37.0? I had installed opensuse 11.1 which was released in december 2008. Boost 1.36.0 was released already in april 2008. Was the error detected so late or are there bug fixes somewhere which could be downloaded? I think there is no 1.36.1? Greetings Ernst > Anthony > -- > Anthony Williams | Just Software Solutions Ltd > Custom Software Development | http://www.justsoftwaresolutions.co.uk > Registered in England, Company Number 5478976. > Registered Office: 15 Carrallack Mews, St Just, Cornwall, TR19 7UL > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > -- Dr.-Ing. Ernst Murnleitner T +49 8761 722 00 67 F +49 8761 722 00 59 Awite Bioenergie GmbH Firmensitz: Angerstr. 9 a, D-85416 Langenbach Registergericht München, HRB 162652 Geschäftsführer: Dr.-Ing. Martin Grepmeier, Dr. Ing. Ernst Murnleitner *** Als Anti-Spam-Massnahme können uns EMails von Mail-Servern ohne gültigen ptr-record (Reverse DNS) nicht erreichen ***

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[serialization] Boost STATIC_WARNING when serializing shared_ptr of a type
by Daniel Roberts 14 Jan '09

14 Jan '09

I am trying to serialize a std::vector< boost::shared_ptr<SomeType> > but I am getting a boost STATIC_WARNING in get_derived_extended_type_info, when compiling the cpp file of the class that owns the vector. Here are the first few lines of the warning: 1>c:\program files (x86)\boost\boost_1_36_0\boost\serialization\extended_type_info_typeid.hpp(88) : warning C4099: 'boost::static_warning_impl<false>::STATIC_WARNING' : type name first seen using 'struct' now seen using 'class' 1> c:\program files (x86)\boost\boost_1_36_0\boost\static_warning.hpp(110) : see declaration of 'boost::static_warning_impl<false>::STATIC_WARNING' 1> c:\program files (x86)\boost\boost_1_36_0\boost\serialization\extended_type_info_typeid.hpp(85) : while compiling class template member function 'const boost::serialization::extended_type_info *boost::serialization::extended_type_info_typeid<T>::get_derived_extended_type_info(const T &) const' 1> with 1> [ 1> T=SomeNamespace::SomeType 1> ] If I create a std::vector<SomeType*>, then the warning goes away. I am including the serialization headers for std::vector and boost::shared_ptr. SomeType itself serializes a std::vector<boost::shared_ptr<SomeOtherType> >, where SomeOtherType IS polymorphic, and I get NO warnings for that one. The warning, to me, suggests that the compiler thinks that SomeType is polymorphic. Is the compiler really referring to SomeOtherType? Any assistance would be appreciated. Thanks

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[General] Warnings and pragmas in MSVC
by Robert Jones 14 Jan '09

14 Jan '09

I've written some code using the Lambda & Lambda.bind libraries, although I don't think that really matters, which produce a page ful of C4503 warnings, *4503 'identifier' : decorated name length exceeded, name was truncated* In my code I've tried using pragma disable around the lines which I altered to cause the warnings, but it makes no difference. Is it necessary to apply these pragmas within the Boost library code, or is there a better way? Thanks, Rob.

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Re: [Boost-users] [LibrariesUnderConstruction] update of LibrariesUnderConstruction wiki page
by vicente.botet 14 Jan '09

14 Jan '09

Hi, The wiki page Libraries Under Construction contains now much more entries. Good trip, Vicente ----- Original Message ----- From: "vicente.botet" <vicente.botet(a)wanadoo.fr> To: <boost(a)lists.boost.org>; <boost-announce(a)lists.boost.org>; <boost-users(a)lists.boost.org> Sent: Sunday, December 07, 2008 5:50 PM Subject: [LibrariesUnderConstruction] new LibrariesUnderConstruction wiki page Hi, I have created a new wiki page containing some of the libraries under construction for Boost. You can access this page from the Boost Trac wiki https://svn.boost.org/trac/boost/wiki > Projects > Libraries Under Construction or directly https://svn.boost.org/trac/boost/wiki/LibrariesUnderConstruction The contents of this page is by nature incomplete and outdated. Please help to maintain this page updated by modifying it directly (if you have the rights) or posting on the Boost mailing lists boost(a)lists.boost.org or boost-users(a)lists.boost.org with the prefix [LibrariesUnderConstruction]. If you're the author of one of these libraries and desire that all or part of the information related to your library be removed or modified, please send a mail or you can do it directly if you prefer. If you're a library author and plan on submitting a library but don't know when it will be ready for review, and you want to include your library in this list, please add it directly (if you have the rights) or send a mail. If you're a library author and plan on submitting a library for review in the next 3-6 months, email Ron Garcia or John Phillips ("garcia at osl dot iu dot edu" and "phillips at mps dot ohio-state dot edu" respectively) a short description of your library and they will add it to the Review Wizard Report Libraries Under Construction section. HTH, Vicente

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Using iostream to create ZIP archive
by Peter Json 14 Jan '09

14 Jan '09

Hi, I'm trying to use boost to create a "zip" file containing more than one file. To my understanding I should use boost::iosteams to do this. In the boost documentation I there is only an example on how to unzip a file ..... http://www.boost.org/doc/libs/1_37_0/libs/iostreams/doc/classes/zlib.html#e… ... but I dont understand how I could do the opposite (create a zip-archive) Especially how to do the naming of the files inside the archive. Does anyone have an example on howto do create a zip-archive containing a couple of text files? Thanx /Peter/ -- View this message in context: http://www.nabble.com/Using-iostream-to-create-ZIP-archive-tp21461391p21461… Sent from the Boost - Users mailing list archive at Nabble.com.

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large enum and native array indexing
by Hicham Mouline 14 Jan '09

14 Jan '09

hello, we have a 3rd party lib which provides an enum OP with some hundred members, but each member is defined with numbers that are not contiguous. enum OP { op1=56, op2=6, op3=5 ..... }; We have a performance critical function f that looks like this: status f( double& result, OP , int thing ); typical usage calls f( result0, op0 ) then f(result1, op1) .... f(resultn, opn) on the same thing. these calls, if merged, could have some speedup as there is some repetitive work done for say op3 and op7. I then thought of doing void f( std::map< Op, pair<status, result> >& output, const std::set<OP>&, int thing ) to collapse the above calls to 1. Inside this f, we set results in output with the [] operator. then I compared this to void f( double results[], status statues[], const std::set<OP>&, int thing ), thanks to the native array contiguous access, it was 4 times faster. therefore i wrote a numerical pseudo-metafunction "Position" to take the enum OP as an input and return a size_t, reflecting the index for the array. A call would be like: std::set<OP> opset; opset.set( op1 ); opset.set( op2 ); ... opset.set( op7 ); double results[7]; status statuses[7]; f( results, statuses, opset, thing ); // then to read output results[ Position<OP5>::value ]; Now, the question is about defining the metafunction Position. template< OP op > struct Position {}; template<> struct Position<OP5> { const size_t value=4; }; .... The 3rd party enum OP in the header file I can't change. Is there a way to generate my metafunction automatically? Any facility in mpl or fusion instead of defining my own metafunction? regards,

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[ASIO/1.35.0]: Exception thrown in epoll_reactor::run (async API)
by Slawomir Lisznianski 14 Jan '09

14 Jan '09

Running on RedHat Linux, compiled with gcc 4.x. Program terminates with "Transport endpoint is not connected" -- io_service::run (processing loop) ends with exception thrown. I'm using asynchronous API. Stack trace of optimized debug (-02 -g) binary shows: #0 0x0000003a15a30155 in raise () from /lib64/libc.so.6 #1 0x0000003a15a31bf0 in abort () from /lib64/libc.so.6 #2 0x0000003a15a6a38b in __libc_message () from /lib64/libc.so.6 #3 0x0000003a15a71634 in _int_free () from /lib64/libc.so.6 #4 0x0000003a15a74c5c in free () from /lib64/libc.so.6 #5 0x00000000005093b0 in boost::asio::detail::epoll_reactor<false>::cleanup_operations_and_timers () #6 0x000000000050e6aa in boost::asio::detail::epoll_reactor<false>::run () #7 0x000000000050ebe3 in boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> >::run () The problem occurs sporadically, under moderate load (about 30 client connections). Appears to be coming from cleanup_operations_and_timers() I can catch exceptions leaking from io_service::run, but would appreciate more info on why this occurs and whether it has other side-effects. Thanks, Slawomir

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Boost graph add vertex
by Damian 14 Jan '09

14 Jan '09

Just as in add_edge(1,2,graph) you get to choose the numbers which represent the vertex is it possible to do the same with add_vertex where i actually choose the vertex number. I guess the syntax might be like add_vertex(3,graph) Cheers Damian

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[boost-users][Milti-Index] labmda and composite key
by Igor R 14 Jan '09

14 Jan '09

Hello, I've got the following data structure: struct Service; typedef shared_ptr<Service> ServicePtr; struct Event { ServicePtr service() const; ptime time() const; }; typedef shared_ptr<Event> EventPtr; struct Cache { struct time_tag{}; typedef mi::multi_index_container< EventPtr, mi::indexed_by< mi::ordered_non_unique< mi::tag<time_tag>, mi::composite_key< EventPtr, mi::const_mem_fun<Event, ServicePtr, &Event::service> mi::const_mem_fun<Event, pt::ptime, &Event::time> > > > > type; typedef type::index<time_tag>::type ByTime; }; Cache cache_; ServicePtr servicePtr = ...; period = ...; I try to extract all the events belonging to some service and bounded by "period": namespace bl=boost::lambda; pair<Cache::type::iterator, Cache::type::iterator> byPeriod = cache_.get<Cache::time_tag>().range(bl::_1 >= make_tuple(servicePtr, period.begin()), bl::_1 <= make_tuple(servicePtr, period.last())); The cache contains lots of matching events, but for some reason, this expression always returs empty region, i.e. byPeriod.first==byPeriod.second. So I'd like to know if the above expression is correct or I'm doing something wrong? Thank you.

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[gil] any_image* conversion to concrete type
by Jan Boehme 14 Jan '09

14 Jan '09

Hi, the following sample code introduces my problem: #include <boost/gil/extension/dynamic_image/dynamic_image_all.hpp> #include <boost/mpl/vector.hpp> #include <boost/gil/extension/io/jpeg_dynamic_io.hpp> int main() { using namespace boost::gil; typedef boost::mpl::vector<rgb8_image_t, cmyk16_planar_image_t> images_t; typedef any_image<images_t> any_image_t; typedef any_image_view<boost::mpl::vector2<rgb8_view_t, cmyk16_planar_view_t > > any_view_t; typedef any_image_view<boost::mpl::vector2<rgb8c_view_t, cmyk16c_planar_view_t> > any_const_view_t; any_image_t img; jpeg_read_image("test2.jpg", img); any_const_view_t cview( img ); rgb8c_view_t rgb_view = cview; } In the last line I want to convert the any_const_view to a concrete type what runs fail in lack of a member named 'pixels'. Does anyone know about that kind of conversion as the documentation imho doesn't contain such a sample. Right now I have to copy the pixels in the following form but I can't believe that this is necessary: rgb8_image_t rgb_image(img.dimensions()); copy_pixels(color_converted_view<rgb8_pixel_t>(const_view(img)), view(rgb_image)); rgb8c_view_t rgb8c_view( const_view(rgb_image) ); Thanks a lot, Jan.

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