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No packets received with boost::asio::ip::udp::socket set to multicast group
by Lennyk 18 Feb '09

18 Feb '09

Hi, I'm using boost 1.35 on a Linux machine. I've written an application which creates a boost::asio::ip::udp::socket, then binds to a certain local address & port - and finally I've created an option to join a boost::asio::ip::multicast::join_group. All seems well, and I see the registration request through a network sniffer. BUT, when I try to receive packets after successfully joining the udp multicast group - I get NOTHING! Needless to say, I see tons of packets streaming through with the sniffer. What am I doing WRONG? Here's my code (just a test application): using namespace std; using namespace boost::asio; int main(int argc, char *argv[]) { if (argc != 4) { // Test for correct number of parameters cerr << "Usage: " << argv[0] << " <Local Address> <Multicast Address> <Port>" << endl; exit(1); } io_service m_io_service; ip::udp::socket m_socket(m_io_service); ip::address localAddress(ip::address_v4::from_string(argv[1])); ip::address multicastAddress(ip::address_v4::from_string(argv[2])); unsigned short port = atoi(argv[3]); // Second arg: port boost::system::error_code error; m_socket.open(ip::udp::v4()); m_socket.bind(ip::udp::endpoint(localAddress, port), error); if (error) { cout << "bind error!" << endl; exit(1); } ip::multicast::join_group option(multicastAddress.to_v4(), localAddress.to_v4()); m_socket.set_option(option); vector<unsigned char> m_receiveBuffer; mutable_buffers_1 buf = buffer((void*)&m_receiveBuffer[0], 1024); int size = (int)m_socket.receive(buf, 0, error); if (error) { cout << "recv error!" << endl; exit(1); } return 0; } Thanks! Lenny.

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Setting thread affinity on Linux using boost::thread
by Lennyk 18 Feb '09

18 Feb '09

Hi, I'm running on Linux and I would like to set a specific thread affinity to each thread I create (i.e. setting each thread to run on a different core/CPU). How can this be done using the boost::thread library? Thanks! Lenny.

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Do the Range Adaptors really depend upon the RegEx static lib?
by Nate Foreman 18 Feb '09

18 Feb '09

Hello, I'm using the range adaptors from the latest version of the range library in the vault. Namely: boost::adaptors::filtered boost::adaptors::transformed The Visual Studio linker was kind enough to inform me that these depend upon the regex static library (libboost_regex-vc80-mt-sgd-1_38.lib). Does anybody know why? I'd rather not build the boost regex lib. Is there any way to avoid this dependency?

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[program options] access violation with _SECURE_SCL turned off
by klaus triendl 18 Feb '09

18 Feb '09

Hi, I'm using the boost 1.36 program options library on windows with msvc++2008, statically linked to my applications. In "debug mode" everything works fine, however, in "release mode" I encounter an access violation when parsing the c++ commandline passed to main() or when parsing the windows commandline with split_winmain(). Note that this happens only if and only if the preprocessor macro _SECURE_SCL gets turned off (_SECURE_SCL=0). scenario 1) Parsing the main() options, even the simple example from the tutorial, section "getting started", terminates with an access violation when calling po::store() without a usable stack trace; scenario 2) A simple call to po::split_winmain(L"\"--test\"") produces a crash. Note the use of a wide character string. The stack trace: boost::program_options::detail::utf8_codecvt_facet::do_in() boost::detail::convert<wchar_t,char,boost::_bi::bind_t<int,boost::_mfi::cmf7<int,std::codecvt<wchar_t,char,int>,int &,char const *,char const *,char const * &,wchar_t *,wchar_t *,wchar_t * &>,boost::_bi::list8<boost::_bi::value<std::codecvt<wchar_t,char,int> const *>,boost::arg<1>,boost::arg<2>,boost::arg<3>,boost::arg<4>,boost::arg<5>,boost::arg<6>,boost::arg<7> > > >() boost::from_8_bit() boost::from_utf8() boost::program_options::split_winmain() wmain(int argc=3407872, wchar_t * * argv=0x00000000) Did somebody encounter this issue? Any solutions? Thanks, Klaus Triendl

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boost::asio::streambuf and wide chars
by Cain Miley 18 Feb '09

18 Feb '09

Hi, currently i have: boost::asio::streambuf request; std::ostream requestStream(&request); requestStream << "hello world"; if i change 'std::ostream' to 'std::wostream' (because streambuf uses char's i assume?) i get an error, how would i do this with wide chars? (sorry if that didn't make much sense)

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Re: [Boost-users] Remove edge
by Gianni Loiacono 18 Feb '09

18 Feb '09

Hi Mr. Michael Olea, thanks for the replay, for the example code and for the help :-) I have tested your code and it works perfectly. But I have a problem, my graph isn't static but dynamic. In fact, the arcs weights are assigned dynamicaly and I don't understand how to adapt your code to my code. Can you help me? Sorry for my poor english, Best regards. This is an example of my code that I want to adapt with remove_edge_if(): #include <iostream> #include <ctime> #include <utility> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> #include <boost/graph/graph_utility.hpp> using namespace std; using namespace boost; HINSTANCE hInst; namespace boost { enum vertex_idNodo_t { vertex_idNodo = 1111 }; enum edge_arcoProprieta_t { edge_arcoProprieta = 2222 }; BOOST_INSTALL_PROPERTY(vertex, idNodo); BOOST_INSTALL_PROPERTY(edge, arcoProprieta); } typedef property<vertex_idNodo_t, int> NodoProperty; typedef property<edge_capacity_t, long> ArcoProperty; typedef adjacency_list<vecS, vecS, undirectedS, NodoProperty, ArcoProperty> Graph; Graph g; property_map<Graph, vertex_idNodo_t>::type idNodo = get(vertex_idNodo, g); property_map <Graph, edge_capacity_t >::type capacityCut = get(edge_capacity, g); graph_traits < Graph >::edge_iterator ei, ei_end; void deleteEdges() { for (tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) { if (capacityCut[*ei] < 10) { remove_edge(source(*ei,g),target(*ei,g),g); //Error invalidates the edge iterators :( } } } void main() { for (tie(ei, ei_end) = edges(g); ei != ei_end; ++ei) { srand(static_cast<unsigned int>(time(NULL))); capacityCut[*ei] = rand() % 8 + 4; } } Passa a Yahoo! Mail. La webmail che ti offre GRATIS spazio illimitato, antispam e messenger integrato. http://it.mail.yahoo.com/

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Clarification on Array, UNION serialization
by niranjan bangera 18 Feb '09

18 Feb '09

Hi all, I want to clarify myself in serialization of union and array, Please clarify my doubts. Boost Version:1.36.0 Compiler :/_TOOLS_/dist/gnu-gcc-/4.1.1-binutils-2.16.1/x86_64-pc-linux2.4/bin/gcc class A { union my_union { uint64_t array1[ 4]; int64_t array2[4]; double dbl [4]; uint32_t array3 [ 8 ]; int32_t array4 [ 8 ]; float flt [ 8]; uint16_t array5[ 16 ]; int16_t array6[ 16 ]; uint8_t array7 [ 32 ]; int8_t arrray8[ 32 ]; } my_union my_obj; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { ar & my_obj.array1; } }; Is it safe to do it, or any othe optimised method is there to do it? how to serialize a dynamicaly allocated array struc my_struct{ int x; } struct new_struct { { my_struct **my_var; ///my_struct is a structure defined before this structure. } In this case do i need to serialize each element int the array manually, Pointed By my_var Is there other some other way to do it... Thanks, Niranjan

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[bccl] Compilation fails due to BOOST_CONCEPT_ASSERT
by Adam Badura 17 Feb '09

17 Feb '09

In my project I have two header files both introducing four BOOST_CONCEPT_ASSERT macros at namespace level. It happened that both those files used those macros at the same lines (same line numbers). The compilation of the one which is included as second fails (on MSVC 2008) with error: d:\studies\thesis\project\prover\formulas\terms\variable.h(83) : error C2365: 'boost_concept_check83' : redefinition; previous definition was 'enumerator' d:\studies\thesis\project\prover\formulas\terms\constant.h (83) : see declaration of 'boost_concept_check83' (repeated for each o those four uses with indexes 84, 85, 86 - clearly line numbers). It seems the line number is used to build some inner use name. Reasonable. But failable as well. Maybe file name macro could be used here however this could give string inappropriate for the identifier. I don't know how to solve this (a temporal workaround is obviously easy - just move the macros in on of files to a different place). I haven't found any info on that neither in the documentation nor in the groups. Adam Badura

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unzip iterator?
by Neal Becker 17 Feb '09

17 Feb '09

I use an iterator adapator that converts a pair of scalar iterators into a complex iterator. But how to go the other direction? Take a complex iterator to a pair of scalar iterators. This is something like 'unzip'. Any thoughts?

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Re: [Boost-users] boost geometry lib
by Barend Gehrels 17 Feb '09

17 Feb '09

Hi, Sorry for my late reply, was not on this list earlier. Thanks for your interest. As Bruno said we're currently busy with preview 4. There are substantial changes internally, but from user perspective the changes are not so large. Two things I'll mention: 1) > > http://geometrylibrary.geodan.nl/6__transformation__example_8cpp-exampl > > e.html > > shows the geometry library and uBLAS working together The transformation example will be changed (and much more simpler, from user perspective). The new version has internally transformation capacities and strategies can be used to finetune this (still using uBLAS) 2) if you plan to use the linestrings, note that the algorithms currently take line.begin() and line.end(). This is changed in the new version to just "line", using the boost range library. Preview 4 is expected this month or the beginning of February. Barend Gehrels Geodan, Amsterdam

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