November 2010 - Boost-users

[asio] INET_ADDRSTRLEN undeclared under cygwin
by Igor R 21 Nov '10

21 Nov '10

Hello, I build my project under Cygwin, and get errors like this: .../boost/asio/detail/socket_types.hpp:125: error: 'INET_ADDRSTRLEN' was not declared in this scope I see that INET_ADDRSTRLEN is defined in /usr/include/cygwin/in.h , but asio doesn't include it. Besides, there're some more undefined macros, which are defined in /usr/include/cygwin/in6.h Meanwhile I apply an ad-hoc solution, but I'm wondering if someone else encountered this issue and what would be the right solution. Thanks.

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serialization over memory mapped files
by Sadhan Sood 21 Nov '10

21 Nov '10

Hi , I want to serialize my class objects ona memory mapped file. I am able to write to the file but reading is throwing me exceptions: namespace io = boost::iostreams; typedef io::stream_buffer<io::mapped_file_source> in_streambuf; typedef io::stream_buffer<io::mapped_file_sink> out_streambuf; int main() { // create and open a character archive for output // std::ofstream ofs("filename"); boost::iostreams::mapped_file_params params; params.path = "filepath"; params.flags = io::mapped_file::mapmode::readwrite; params.new_file_size = 10240; out_streambuf obuf(params); std::ostream ofs(&obuf); // create class instance const gps_position g(35, 59, 24.567f); // save data to archive { boost::archive::text_oarchive oa(ofs); // write class instance to archive oa << g; // archive and stream closed when destructors are called } /* ready for reading */ params.flags = io::mapped_file::mapmode::readonly; params.new_file_size = 0; // ... some time later restore the class instance to its orginal state gps_position newg; { // create and open an archive for input in_streambuf ibuf(params); /* this is throwing me exceptions */ std::istream ifs(&ibuf); //std::ifstream ifs("filename"); boost::archive::text_iarchive ia(ifs); // read class state from archive ia >> newg; // archive and stream closed when destructors are called } return 0; } Any help is appreciated. Thanks, Sadhan

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Re: [Boost-users] [smart_ptr] Multiple inheritance problem with smart pointer
by José Augusto Jr. 21 Nov '10

21 Nov '10

Hi All, I'm trying to begin using smart pointers, and when I changed my typedefs like: typedef TimeSeriesClass* pTimeSeries; to typedef boost::shared_ptr<TimeSeriesClass> pTimeSeries; where: class TimeSeriesClass : public wxGridTableBase, public tsObject { (...) } I get an error in this situation: myDataAnalyserFrame::myDataAnalyserFrame( wxWindow* parent , pTimeSeries myTimeSeries) : DataAnalyserFrame( parent ) { m_myTimeSeries = myTimeSeries; m_tsOld = new wxGridStringTable( 1, 1 ); DataGrid->SetTable(m_myTimeSeries ,false); => the m_myTimeSeries, whis is a smart pointer to the TimeSeriesClass, doesn't know that TimeSeriesClass is also wxGridTableBase child? m_myTimeSeries->AutoSizeColsLabels(); DataGrid->Refresh(); } bool SetTable( wxGridTableBase *table, bool takeOwnership = false, wxGrid::wxGridSelectionModes selmode = wxGrid::wxGridSelectCells ); The problem occurs because the smart_pointer to the TimeSeriesClass seems to ignore that TimeSeriesClass is also a wxGridTableBase. With normal pointers it functions. Why it does not work? What i'm doing wrong? Thanks in advance. Best Regards. José Augusto

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STLport 5.2.1 + Boost 1.45.0 on 64bit Linux - compilation error
by Masaru Nomiya 21 Nov '10

21 Nov '10

Hello, I've tried to build boost 1.45.0 against STLport-5.2.1 on 64bit Linux (openSUSE 11.1) with 64bit gcc-4.3.2, but I got following error; [...] /tmp/source/boost_1_45_0/tools/build/v2/build/feature.jam:485: in feature.validate-value-string from module feature error: "stlport" is not a known value of feature <stdlib> error: legal values: "native" /tmp/source/boost_1_45_0/tools/build/v2/build/property.jam:276: in validate1 from module property /tmp/source/boost_1_45_0/tools/build/v2/build/property.jam:301: in property.validate from module property /tmp/source/boost_1_45_0/tools/build/v2/build/build-request.jam:216: in convert-command-line-element from module build-request /tmp/source/boost_1_45_0/tools/build/v2/build/build-request.jam:153: in build-request.from-command-line from module build-request /tmp/source/boost_1_45_0/tools/build/v2/build-system.jam:611: in load from module build-system /tmp/source/boost_1_45_0/tools/build/v2/kernel/modules.jam:283: in import from module modules /tmp/source/boost_1_45_0/tools/build/v2/kernel/bootstrap.jam:142: in boost-build from module /tmp/source/boost_1_45_0/boost-build.jam:17: in module scope from module I use ./bjam as follows; $ ./bjam stdlib=stlport -sSTLPORT_INCLUDE_DIRECTORY=$STLPORT/stlport -sSTLPORT_LIB_DIRECTORY=$STLPORT/lib -sBUILD=release,debug --runtime-debugging=on --prefix=/usr/local --libdir=/usr/local/lib64 stage Any help appreciated. --- ┏━━┓彡 Masaru Nomiya mail-to: nomiya @ galaxy.dti.ne.jp ┃＼／彡 ┗━━┛

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[interval] self defined base types
by Sven Heithecker 21 Nov '10

21 Nov '10

Hi ! I am currently doing some experiments with boost::interval and self-defined base types. I have problems with the rounding modes. I read the according documentation about the rounding (and checking) stuff, but unfortunately I did not unterstand it completely. So, what I want for now is to use intervals without any special rounding mode. Maybe I will implement correct rounding sometimes later... I expect I have to declare the interval type as follows: using namespace boost::numeric; using namespace interval_lib; // mutable_t is my base type typedef interval <mutable_t,[policy_no_rounding]> I; The problem is: what to put in [policy_no_rounding] ? Regards, Sven -- Sven Heithecker GPG Fingerprint: 527F 06C2 BF51 96CE DFF7 CC89 1A6B DFD5 BEC2 02A6Hi !

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[wave] Dummy lexer
by Ravi 20 Nov '10

20 Nov '10

Hi, Is it possible to use wave only for the following? - Macros - Conditional inclusion/exclusion - #include handling In other words, it is possible to use wave with a dummy lexer? The idea is to use wave to generate a string representation after preprocessing a file; the resulting string can then be passed to a custom spirit V2.2+ grammar. One could write a lexer with the tiny subset of C++ tokens that is used in my grammar, but that seems overkill for a small grammar (which is currently well- tested and performs quite well). The application is very similar to the C++- like config file structure supported by property_tree. The closest I have been able to come using components out of the box is to use the cpplexer with the following non-default features (compared to the quick- start example): - preserve comments - disable whitespace insertion If a dummy lexer is already available that works, where can it be found? Regards, Ravi

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[boost.thread] events
by Sean Farrow 20 Nov '10

20 Nov '10

Hi: Has boost.thread or the boost libraries got anything that will enable a program to signal more than one thread when it should exit. Basically, I have four threads in a program, and when the main message loop signals it should exit, I'd like to tell two of the other three threads to exit, this has to be cross platform as far as possible. Any help appreciated. Sean.

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Error while using bundled property with subgraph
by giridhar 20 Nov '10

20 Nov '10

Hello All, I am using bundled property in my subgraph. I have bundled property structure defined for edges. It works fine with the normal graph. But when I try to create the subgraph I am getting this error. *error C2338: (!is_same<edge_index_type, boost::detail::error_property_not_found>::val* ue). This is how my bundled edge property looks like struct Edgep { int edge_index; int edge_w; std::string edge_name; }; This is how my graph is created typedef subgraph< adjacency_list<vecS, vecS, undirectedS, property<vertex_index_t, int>,Edgep > > Graph; Can you please help me to interpret this error. What is causing this error? -- Regards, Giridhar

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non incremental use of atomic_counter
by Gennadiy Rozental 19 Nov '10

19 Nov '10

Hi, I've got a following problem: I need to maintain actively used shared counter in MT environment. I need usual increment and decrement operations with increment value of 1 plus I also need sometimes to operate with large increment value (like 1000, 10000). I'd like to make handling of this counter as fast as possible and would like to use atomic_counter used inside of boost::shared_ptr, but I can't seem be able to find a way to effectively/correctly implement "massive" increments with it. Any recommendations, Thank you. Gennadiy

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[serialization] compare two archives?
by James C. Sutherland 19 Nov '10

19 Nov '10

It appears that the operator == is not supported on an archive. Is there a way to compare two archives for equality without instantiating all objects in the archive and looking at equality of the objects? James

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