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[Spirit] Grammar rule problem
by Dylan Klomparens 30 Oct '09

30 Oct '09

Hello, I'm writing a configuration file parser with boost::spirit, and have encountered some strange errors. The errors are: 1) error C2078: too many initializers (in file assign_actor.hpp, line 62) 2) error C2440: 'initializing' : cannot convert from 'const iterator_t ' to 'value_type' (in file assign_actor.hpp, line 62) The line that's causing the error is identical (in concept) to the one above. Why is it generating an error? The code I'm using is below. Rule "two" is generating the error. #include <iostream> #include <boost/spirit.hpp> using namespace std; int main() { using namespace boost::spirit; const int UnsignedCharacterMaximum = (numeric_limits<unsigned char>::max)(); const int UnsignedShortMaximum = (numeric_limits<unsigned short>::max)(); rule<> octet_p = limit_d(0, UnsignedCharacterMaximum)[int_p]; rule<> ip_address_p = octet_p >> ch_p('.') >> octet_p >> ch_p('.') >> octet_p >> ch_p('.') >> octet_p; rule<> network_port_p = limit_d(0, UnsignedShortMaximum - 1)[int_p]; string s; int i; rule<> one = ip_address_p[assign_a(s)]; rule<> two = network_port_p[assign_a(i)]; // Commenting this line gets rid of the error. // But this line should work. It is identical (in conecpt) to the previous line. cout << parse("192.168.0.1", one).full << endl; return 0; }

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BGL - VertexList of adjacency_list = boost::setS?
by Ondrej Sluciak 30 Oct '09

30 Oct '09

Is there some reason why the vertexlist parameter of adjacency_list cannot be of "setS" type? If I do something like: typedef boost::adjacency_list<boost::listS,boost::setS> Graph; Graph g; boost::add_edge(0,1, g); I always get this error: Error 1 error C2664: 'std::pair<_Ty1,_Ty2> boost::add_edge<boost::detail::adj_list_gen<Graph,VertexListS,OutEdgeListS,DirectedS,VertexProperty,EdgeProperty,GraphProperty,EdgeListS>::config>(void *,void *,boost::directed_graph_helper<Config> &)' : cannot convert parameter 2 from 'int' to 'void *' c:\mycode\boosttest\boosttest\boosttest.cpp 18 If I change it to vecS, then it works. I know the std::set is somehow different from vector or list, but since I don't understand it so well, I don't know why the vertexList cannot be setS, and for example OutEdgeList (1st parameter of adjacency_list) can. Thanks for clarifynig.

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[REGEX] seg fault
by John Robertson 30 Oct '09

30 Oct '09

When running the credit_card snippet in gdb I get. Program received signal SIGSEGV, Segmentation fault. 0x00002ac3263b38f2 in boost::re_detail::cpp_regex_traits_implementation<char>::lookup_classname_imp () from /usr/lib64/libboost_regex.so.2 I'm using BOOST_VERSION 103900 Thanks -JR

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program_options wchar_t support (again)
by Yang Zhang 30 Oct '09

30 Oct '09

Last mentioned I could find was 5 years ago: http://lists.boost.org/Archives/boost/2004/02/61057.php Has this been fixed? -- Yang Zhang http://www.mit.edu/~y_z/

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Incorrect parameters problem
by Mathew Benson 30 Oct '09

30 Oct '09

My project was compiling and executing, but I get an error now. I'm not sitting at my desk right now, but I think it said "Incorrect parameters" when I examine the error. Here's the offending code: boost::asio::io_service io_service; using boost::asio::ip::udp; udp::socket s(io_service, udp::endpoint(udp::v4(), 0)); udp::resolver resolver(io_service); udp::resolver::query query(udp::v4(), "127.0.0.1", 606); try { udp::resolver::iterator iterator = resolver.resolve(query); s.send_to(boost::asio::buffer(buffer, size), *iterator); } catch ( std::exception& e ) { std::cout << e.what() << std::endl; } The first line in the try block is what causes the exception. I thought I backed out all my changes, but I still can't get it to work. Can somebody tell me what obvious dumb mistake I made?

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[Serialization] XML serialization of class with abstract template ancestors
by Terry Roberts 30 Oct '09

30 Oct '09

Hi, I'm having some trouble using the Serialization library with a class derived from an abstract template (example code below). What I'd like to do is serialize instances of the derived type through a base class pointer (polymorphic) using the XML archive. The code below works fine using both the text and binary archives, but fails at runtime with the XML archive. The exception thrown is boost::archive::xml_archive_exception with the message "uninitialized exception". My environment: GCC 4.1.2 on RHEL 5.3 Boost v1.37 I've also attempted to use Boost 1.40 (although I didn't see anything to suggest relevant changes), which results in link errors (undefined references to members of boost::archive::detail::archive_serializer_map<boost::archive::xml_iarchive> and boost::serialization::void_cast_detail::void_caster among others). Any help would be appreciated. Thanks. #include <iostream> #include <string> #include <sstream> #include <boost/serialization/serialization.hpp> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/export.hpp> class AbstractBase { public: AbstractBase(const std::string& n):name(n) {} virtual ~AbstractBase() {} virtual std::ostream& print(std::ostream& os) const = 0; protected: AbstractBase():name("UNKNOWN BASE") {} friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const uint32_t version) { ar & BOOST_SERIALIZATION_NVP(name); } std::string name; }; template <class T> class AbstractTemplate : public AbstractBase { public: AbstractTemplate(const std::string& n):AbstractBase(n) {} virtual ~AbstractTemplate() {} virtual void doSomething(const T& t) = 0; protected: AbstractTemplate():AbstractBase("UKNOWN TEMPLATE") {} friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const uint32_t version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(AbstractBase); } }; class Derived : public AbstractTemplate<std::string> { public: Derived(const std::string& n):AbstractTemplate<std::string>(n) {} virtual ~Derived() {} std::ostream& print(std::ostream& os) const { return os << "Derived name: " << name << std::endl; } void doSomething(const std::string& str) { print(std::cout << str << ": "); } protected: Derived():AbstractTemplate<std::string>("UNKNOWN DERIVED") {} friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const uint32_t version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(AbstractTemplate<std::string>); } }; BOOST_CLASS_EXPORT(Derived) namespace boost { template <> struct is_abstract<AbstractBase > { typedef mpl::bool_<true> type; BOOST_STATIC_CONSTANT(bool, value = true); }; template<class T> struct is_abstract<AbstractTemplate<T> > { typedef mpl::bool_<true> type; BOOST_STATIC_CONSTANT(bool, value = true); }; } // namepsace boost int main(int argc, char** argv) { static const char XML_NAME[] = "Stuff"; Derived* d = new Derived("test 1"); AbstractTemplate<std::string>* at = d; AbstractBase* ab = d; std::cout << "before serialization:" << std::endl; d->doSomething("something"); at->print(std::cout); ab->print(std::cout); /* serialization */ std::stringstream ss; { boost::archive::xml_oarchive xmlOut(ss); xmlOut << boost::serialization::make_nvp(XML_NAME, ab); } delete ab; ab = NULL; std::cout << "Serialization:" << std::endl << ss.str() << std::endl; /* deserialization */ { boost::archive::xml_iarchive xmlIn(ss); xmlIn >> boost::serialization::make_nvp(XML_NAME, ab); } at = dynamic_cast<AbstractTemplate<std::string>*>(ab); d = dynamic_cast<Derived*>(ab); if ((ab == NULL) || (at == NULL) || (d == NULL)) { std::cout << "deserialization failed" << std::endl; return EXIT_FAILURE; } std::cout << "after deserialization:" << std::endl; d->doSomething("something"); at->print(std::cout); ab->print(std::cout); delete ab; return EXIT_SUCCESS; }

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Compile warnings
by HT4N - 30 Oct '09

30 Oct '09

When I compile the boost spirit with VisualStudio I got the following warnings. Is this a known issue/bug? /* c:\src\indexserve2\private\shared\boost\spirit\tree\impl\tree_to_xml.ipp(66) : warning C4996: 'std::ctype<wchar_t>::wide Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' */ #pragma warning(disable:4996) /* c:\src\indexserve2\private\shared\boost\spirit\tree\parse_tree.hpp(213) : warning see reference to class template instantiation 'boost::spirit::skip_parser_iteration_policy<ParserT>' being compiled c:\src\indexserve2\private\shared\boost\spirit\core\scanner\skipper.hpp(147) : warning C4512: 'boost::spirit::skip_parse r_iteration_policy<ParserT>' : assignment operator could not be generated */ #pragma warning(disable:4512) _________________________________________________________________ Windows 7: It helps you do more. Explore Windows 7. http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WL…

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[lambda] delayed assignment to a member
by Igor R 29 Oct '09

29 Oct '09

Hello, How can I create a functor, which would assign to a member variable, when invoked? I mean, something like this: int member_; //... lambda::bind(my_obj::member_, this, 5); The above bind itself compiles, but if I try to invoke it or to assign to a function<void()>, it doesn't compile. Thanks.

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[getting IP-header]How do I get the IP-header information
by Mats Carlsson 29 Oct '09

29 Oct '09

Hello, I'm trying to get the IP-header information from an IP-message sent using boost. I can get the message itself by using: void Receiver::wait_for_packet() { socket.async_receive_from(boost::asio::buffer(receive_buffer), remote_endpoint, boost::bind( &Receiver::handle_packet, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void Receiver::handle_packet(const boost::system::error_code& error, int bytes_transferred) { if (error) { //throw boost::system::system_error(error); } std::string message; for (int i = 0; i < bytes_transferred; i++) { message += receive_buffer[i]; } std::string payload(message); Packet packet; packet.set_payload(payload); listener->new_packet_received(packet); wait_for_packet(); } Where "message" is the body of the sent stuff. But how do I get to the IP-header things? I've been looking in doc/html/boost_asio/example/serialization/connection.hpp, but do not really get what to do. BR, /Mats Carlsson

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asynch_write fails when used to write long data
by A.Agrawal＠patrick.com.au 29 Oct '09

29 Oct '09

Hi, I have a Client (windows) - server (linux) program which uses boost::asio asynch methods. I am getting error when server writes to client using asynch_write and data is large with size greater than a particular value. ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// std::vector<boost::asio::const_buffer> _buffers; _buffers.push_back(boost::asio::buffer(outbound_header)); _buffers.push_back(boost::asio::buffer(outbound_message)); _buffers.push_back(boost::asio::buffer(outbound_data)); boost::asio::async_write(_socket, _buffers, boost::bind(&ClientSession::handle_write, this, boost::asio::placeholders::error)); ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// here outbound_header is of type string of length 8 and has value " 202e5" outbound_message is of type string of length 8 and has value " 2" outbound_data when of length 131813. I get error with error_code - val = 14 (Bad Address) If I reduce the outbound_data size to 130812, everything is fine. I am unable to figure out the problem, I thought I can send unlimited size data in a single call. Please advise if you have any idea. I will be more than happy to provide you with information that you may need. Regards, Anil Agrawal PTS

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