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Serialization of functors and MPL use
by Anonymous user 17 Sep '10

17 Sep '10

Hello everybody, � I'm currently trying to serialize functors. Apparently, it is not possible to serialize boost::function objects, is it possible to find a way to serialize pointer to function ? (in order to make working the example below*) If it is definitively not possible, is there a way to 'register' a relation betwwen objects and functor ? (using MPL library). The idea is to rebuild the boost function according to the 'Object and 'Type' class of the template'. � Example:� � mpl::pair<Object,Function> container; serialize() { boost::function<Type ()> m_getter=mpl::at< container,Object>; } � � *Here is the problem that� I'm trying to resolve: � MyObject myObject("before"); � SetCommand<std::string,MyObject> SetCommand(myObject,&MyObject::setName,&MyObject::getName,"after"); � SetCommand.do(); � // call functor 'MyObject::setName("after")' SetCommand.undo(); // call functor 'MyObject::setName("before")' � � template<typename Type,typename Object> class SetCommand : public Command { � � � public: � � � � � template <typename Setter, typename Getter> � � � � SetCommand(Object& o, const Setter& setter, const Getter& getter, const Type& value) : � � � � � � Command(), � � � � � � m_getter(boost::bind(getter, &o)), � � m_setter(boost::bind(setter, &o, _1)), � � � � � � initialValue(m_getter()), � � � � � � finalValue(value) � � � � { � � � � } � virtual void undo() � � � � { � � � � � � m_setter(initialValue) ; � � � � } � � � � � virtual void do() � � � � { � � � � � � m_setter(finalValue) ; � � � � } � �� private: � friend class boost::serialization::access; � SetCommand(){} � template <class Archive>� void serialize( Archive & ar, const unsigned int version ) { � � ar & m_getter; ERROR -> does not compile !!! � ar & m_setter; ERROR -> does not compile !!! � � ar & initialValue; � ar & finalValue; } � boost::function<Type ()> m_getter ; � � � � boost::function<void (Type)> m_setter ; � � � � � Type initialValue ; � � � � Type finalValue ; }; � Thanks in advance. � -------------------------------------------------------------- Ovi Mail: Making email access easy http://mail.ovi.com

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BoostCon Proto Video
by OvermindDL1 17 Sep '10

17 Sep '10

Greetings, On the Proto video in BoostCon 2010, there are a few jumps, at least one of them major, skipping a large portion of the mini-phoenix setup. Is there a complete video of this conference up without the broken segments?

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multi_array with user defined types?
by Suresh Kumar 17 Sep '10

17 Sep '10

Hi To use multi_array with user defined types, is there any restriction on the user defined types? When I tried compiler generates so many error messages like this: My definition is like this: typedef boost::multi_array<score, 2> array_type; //score is defined as a structure typedef array_type::index Index; Error messages: /usr/include/boost/multi_array/subarray.hpp:238: error: ‘const struct score’ has no member named ‘num_dimensions’ /usr/include/boost/multi_array/subarray.hpp:239: error: ‘const struct score’ has no member named ‘shape’ /usr/include/boost/multi_array/subarray.hpp:239: error: ‘const struct score’ has no member named ‘shape’ scoreAnalysis.cpp:34: instantiated from here /usr/include/boost/multi_array/subarray.hpp:242: error: ‘const struct score’ has no member named ‘begin’ /usr/include/boost/multi_array/subarray.hpp:242: error: ‘const struct score’ has no member named ‘end’ thanks suresh -- R Suresh Kumar, http://www.ee.ucr.edu/~sramachandranna Sarve bhavantu sukinaha (May everyone be happy) Sarve santu niramiyaha (May everyone be without affliction) Sarve bhadrani pashyantu (May everyone see only goodness) Ma kashchit dukha bhak bhavet (Let none be the victim of suffering)

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eigen2 and multi_array
by Suresh Kumar 16 Sep '10

16 Sep '10

Hi I was trying to use boost::multi_array in a project where I am already using eigen2. The following lines does not compile in my code, though it compiles correctly outside my project ie as a standalone program where eigen is not used. typedef multi_array<double, 2> array_type; array_type scores(extents[1][1]); compiler error: ‘extents’ is not a type Any suggestions? thanks suresh -- R Suresh Kumar, http://www.ee.ucr.edu/~sramachandranna -- Dhyaana–moolam Guror murtih Puja-moolam Guroh padam Mantra – moolam Guror vakyam Moksha – moolam Guroh krpa.

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Serialization of functors and MPL
by Anonymous user 16 Sep '10

16 Sep '10

�Hello everybody,�I'm currently trying to serialize functors.Apparently, it is not possible to serialize boost::function objects,is it possible to find a way to serialize pointer to function ? (in order to make working the example below*)If it is definitively not possible, is there a way to 'register' a relation betwwen objects and functor ? (using MPL library).The idea is to rebuild the boost function according to the 'Object and 'Type' class of the template'.�Example:��mpl::pair<Object,Function> container;serialize(){boost::function<Type ()>�m_getter=mpl::at<�container,Object>;}��*Here is the problem that �I'm trying to resolve:�MyObject�myObject("before");SetCommand<std::string,MyObject> SetCommand(myObject,&MyObject::setName,&MyObject::getName,"after");�SetCommand.do(); � // call functor 'MyObject::setName("after")'SetCommand.undo();�// call functor 'MyObject::setName("before")' template<typename Type,typename Object>class�SetCommand : public Command{ ��public:�� template�<typename�Setter,�typename�Getter>�� SetCommand(Object& o,�const�Setter& setter,�const�Getter& getter,�const�Type& value) :� � � � � ��Command(),� � � � � ��m_getter(boost::bind(getter, &o)),�� m_setter(boost::bind(setter, &o, _1)),� � � � � ��initialValue(m_getter()),� � � � � ��finalValue(value)� � � � {� � � � }�virtual�void�undo()� � � � {� � � � � ��m_setter(initialValue) ;� � � � }�� virtual�void�do()� � � � {� � � � � ��m_setter(finalValue) ;� � � � }�� private: friend�class�boost::serialization::access; SetCommand(){} template�<class�Archive>� void�serialize( Archive & ar,�const�unsigned�int�version ) { ��ar & m_getter;ERROR -> does not compile !!! ��ar & m_setter;ERROR -> does not compile !!! �� ar &�initialValue; �� ar &�finalValue; } boost::function<Type ()>�m_getter�;� � � ��boost::function<void�(Type)>�m_setter�;�� Type�initialValue�;� � � � Type�finalValue�;}; Thanks in advance. -------------------------------------------------------------- Ovi Mail: Making email access easy http://mail.ovi.com

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questions on PBGL
by Raghava Mutharaju 16 Sep '10

16 Sep '10

Hello Boost users, I am looking at Parallel Boost Graph Library (PBGL) to check whether it fits our project needs. I have a few questions on PBGL. 1) How does PBGL know about the size of the cluster -- its IP address, name? 2) What is the performance of it -- are there any other numbers apart from ones in the paper http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.107.5681? Thank you. Regards, Raghava.

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HTTP Parser
by Anand Patel 16 Sep '10

16 Sep '10

All, I am looking into developing an HTTP Proxy with content filtering and other mechanism as a fun project. Is there anything available in BOOST or in other libraries that I can read upon and use them. Specifically, I need to have HTML Parser and some sort of Proxy implementation. Few features that I aiming for are: 1. Intercept request on port 80. 2. Retrieve entire page and parse the page and check with current rules. 3. URL checking with current policy. Thanks, -AP

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Connection refused after close then open.
by Doak, Roger (GE Healthcare) 16 Sep '10

16 Sep '10

I'm trying to limit the connections made to the server. So after creating the acceptor and accepting MAX connections I closed the acceptor. Further connections are properly rejected. However after one of the connections is closed by the client I attempt to re-open the acceptor but further connections are still rejected? Create and open: m_acceptor(m_ioService, m_endpoint = resolve(m_ioService, host, port), true) Async accept: m_acceptor.async_accept(connection->socket(), boost::bind(&IpServer::handleAccept, this, aph::error, connection)); Close after max connections: m_acceptor.close(); Reopen when a connection is available: m_acceptor.open(m_endpoint.protocol()); m_acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true )); m_acceptor.bind(m_endpoint); m_acceptor.listen(); Thanks for your time. Roger

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[DateTime] local_adjustor for run-time
by Igor R 16 Sep '10

16 Sep '10

Hello, I'm writing a client application that receives from a server UTC timestamps and the server local time-zone. I have to display this time in my client app in terms of the server time-zone (i.e. the server local time should be displayed, not the client one). For this purpose I intended to use local_adjustor, but I see it wants compile-time time-zone value. Is there a similar facility that allows run-time parameters? Thanks.

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[Proto] Default-constructing a proto::terminal
by Roland Bock 16 Sep '10

16 Sep '10

Hi, I have a class which has boost::proto::terminal members like this: struct _table { struct id { id(); // default constructible /*...*/ }; boost::proto::terminal<id> id_terminal; }; _table table; Will table.id_terminal be constructed correctly? I am asking because in Proto's documentation terminals are always instantiated with curly braces, e.g.: typedef proto::terminal<int>::type int_; int_ i = {42}, j = {24}; template<int I> struct placeholder {}; proto::terminal<placeholder<0> >::type const _1 = {{}}; proto::terminal<placeholder<1> >::type const _2 = {{}}; Thanks and regards, Roland

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