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How to use make_bfs_visitor (and/or time_stamper)
by David Doria 10 Jun '11

10 Jun '11

I figured out how to make a custom visitor for a BFS search: http://programmingexamples.net/index.php?title=CPP/Boost/BGL/BreadthFirstSe… but now I am trying to figure out what make_bfs_visitor does, and use it, potentially in conjunction with boost::time_stamper http://programmingexamples.net/index.php?title=CPP/Boost/BGL/MakeBFSVisitor Would anyone mind taking a look there to see where I am going wrong. You can see I tried a lot of things that didn't work :) Thanks, David

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Serialization TextArchive are Cross-Language?
by Marco Piacentini 09 Jun '11

09 Jun '11

Hy...I try to explain better my question... Im using boost serialization text archive before sending data over TCP connection... Now I need to pass the received data to a Java application...so I would know if the serialized stream is composed only by the data or by the data + boost serialization(tag, code, etc.)... In this case my only chance to transfer the data to the java application, is to filter them before transfering?thanks...

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More boostcon videos
by Marshall Clow 09 Jun '11

09 Jun '11

Bartoz (Tuesday): http://blip.tv/boostcon/haskell-the-pseudocode-language-for-c-template-meta… Tony (Wednesday): http://blip.tv/boostcon/lockfree-programming-part-2-data-structures-5258064 Cliff (Wednesday); http://blip.tv/boostcon/design-journeys-with-skoot-a-peer-oriented-generic-… I'm hoping to get about half of the videos up before I go on holidays next week. -- Marshall -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Igor R 09 Jun '11

09 Jun '11

> Putting everything into one file, surprisingly for me, solved my problem of > not being able to nest a sub-state under a super state. Now I need to figure > out why the previous implementation (i.e., the one distributed over multiple > files) does not compile. I guess you try to use undefined (forward-declared) types in contexts where they cannot be used.

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Gurcan Gulesir 09 Jun '11

09 Jun '11

> I belive, you can reproduce it in one single file, > which we could just copy&paste into an empty file, and try to compile. > It should go like this: > > // states definition... > // machine definition... > int main() >{ > // machine instantiation >} Ok. Please see the attached file in which I put the whole source code. Putting everything into one file, surprisingly for me, solved my problem of not being able to nest a sub-state under a super state. Now I need to figure out why the previous implementation (i.e., the one distributed over multiple files) does not compile. Ultimately, I should be able to distribute my actual state machine implementation to multiple files for better scalability, readability, maintainability, etc. I will investigate further and announce the outcome. Needless to say, I would also very much appreciate if you would be willing to quickly point out where I went wrong in the previous implementation.

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[Boost::Thread] Unable to declare boost::thread in a dll problem
by kmdarkmaster 09 Jun '11

09 Jun '11

Hello, Please help me I have a weird problem while testing Boost::Thread. I can create threads and do stuffs without problem when compiled as an exe, but unable to declare even a single thread when compiled as a dll. (I'm using MS Visual Studio 2010 pro). In fact, when I create a win32 console application and use this code, it compiles perfectly : /*********************coooooode*********************/ #include "stdafx.h" #include <boost\thread.hpp> int _tmain(int argc, _TCHAR* argv[]) { boost::thread myThread; return 0; } /**************************************************/ Now I create a DLL application, create a cpp, and write the same simple code : /********************coooooodddeee***********************/ #include "stdafx.h" #include <boost\thread.hpp> void testDLL_Thread(){ boost::thread myThread; } /*******************************************************/ My DLL has the same boost configuration as the console app, and it doesn't even export anything. Now during compilation, i get those Linker error : /************RAAAAGGGEE***************/ LNK1169: un ou plusieurs symboles définis à différentes reprises ont été rencontrés LNK2005: "public: __thiscall boost::thread::~thread(void)" (??1thread@boost@@QAE@XZ) déjà défini(e) dans boost_thread-vc100-mt-gd-1_46_1.lib(boost_thread-vc100-mt-gd-1_46_1.dll) LNK2005: "public: __thiscall boost::thread::thread(void)" (??0thread@boost@@QAE@XZ) déjà défini(e) dans boost_thread-vc100-mt-gd-1_46_1.lib(boost_thread-vc100-mt-gd-1_46_1.dll) /**************************************/ Sorry for the French stuffs but you guys know those errors for sure I know that many people have already created threads in DLL, so please help me understand why it didn't work in this simple case. Thank you very much, kmdarkmaster -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-Thread-Unable-to-declare-boost-thr… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Gurcan Gulesir 09 Jun '11

09 Jun '11

Hi Andreas, I realized that some lines in my previously posted listings were wrapped by my e-mail client. Since this may cause compilation problems for you, I hereby attach the source code files for your convenience. Thanks & Regards, Gurcan

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Igor R 09 Jun '11

09 Jun '11

> Upon your request, I wrote a small but complete program that demonstrates > the issue. This program consists of 5 source code files: > > 1) main.cpp > 2) StateMachine.hpp > 3) StateMachine.cpp > 4) SuperState.hpp > 5) SubState.hpp You've got a compiler error, not a linker one, right? If so, why do you need 2 translation units and 5 files to reproduce it? I belive, you can reproduce it in one single file, which we could just copy&paste into an empty file, and try to compile. It should go like this: // states definition... // machine definition... int main() { // machine instantiation }

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Re: [Boost-users] [statechart] Is it possible to have nested (sub)states in an asynchronous state machine?
by Gurcan Gulesir 09 Jun '11

09 Jun '11

Hi Andreas, Many thanks for your help first of all! Upon your request, I wrote a small but complete program that demonstrates the issue. This program consists of 5 source code files: 1) main.cpp 2) StateMachine.hpp 3) StateMachine.cpp 4) SuperState.hpp 5) SubState.hpp The contents of these files are listed at the end of this e-mail. You should be able to compile these listings and then run the executable successfully. Depending on your compiler flags, you may receive one warning that says "/* within comment". This is intentional, so please ignore the warning. To reproduce my problem regarding the nesting of states, please modify the listings in three locations, as explained in the comments in SuperState.hpp and SubState.hpp, and then re-compile. You should receive multiple errors pointing to the Boost Statechart library. Looking forward to your feedback. Thanks & Regards, Gurcan ---------------------------------------- 1) main.cpp ---------------------------------------- #include <iostream> #include <boost/bind.hpp> #include <boost/function.hpp> #include <boost/thread/thread.hpp> #include <boost/statechart/asynchronous_state_machine.hpp> #include <boost/statechart/fifo_worker.hpp> #include "StateMachine.hpp" int main() { std::cout<<"\n\nPress any key and then <CR> to exit\n\n"<<std::endl; char key; boost::statechart::fifo_scheduler<> scheduler(true); boost::statechart::fifo_scheduler<>::processor_handle handle = scheduler.create_processor<StateMachine> (); scheduler.initiate_processor(handle); boost::thread aThread(boost::bind(&boost::statechart::fifo_scheduler<>::operator(),&schedu ler, 0)); std::cin >> key; scheduler.destroy_processor(handle); scheduler.terminate(); aThread.join(); return 0; } ---------------------------------------- 2) StateMachine.hpp ---------------------------------------- #ifndef StateMachine_hpp #define StateMachine_hpp #include <boost/statechart/asynchronous_state_machine.hpp> class StateMachine; class SuperState; namespace boost { namespace statechart { template<> inline void asynchronous_state_machine<StateMachine, SuperState>::initiate_impl() {} }} class StateMachine: public boost::statechart::asynchronous_state_machine<StateMachine, SuperState> { public: StateMachine(my_context ctx) : my_base(ctx) {} private: virtual void initiate_impl(); }; #endif ---------------------------------------- 3) StateMachine.cpp ---------------------------------------- #include <boost/statechart/state_machine.hpp> #include "StateMachine.hpp" #include "SuperState.hpp" void StateMachine::initiate_impl() { boost::statechart::state_machine<StateMachine, SuperState>::initiate(); } ---------------------------------------- 4) SuperState.hpp ---------------------------------------- #ifndef SuperState_hpp #define SuperState_hpp #include <iostream> #include <boost/statechart/simple_state.hpp> #include "StateMachine.hpp" #include "SubState.hpp" class StateMachine; class SubState; //MODIFICATION 1 of 3: UNCOMMENT THE FOLLOWING LINE //class SuperState: public boost::statechart::simple_state<SuperState, StateMachine, SubState> { //MODIFICATION 2 of 3: COMMENT OUT THE FOLLOWING LINE class SuperState: public boost::statechart::simple_state<SuperState, StateMachine> { public: SuperState(){ std::cout<<"Entered into SuperState."<<std::endl; } }; #endif ---------------------------------------- 5) SubState.hpp ---------------------------------------- //MODIFICATION 3 of 3: COMMENT OUT THE FOLLOWING LINE /* #ifndef SubState_hpp #define SubState_hpp #include <iostream> #include <boost/statechart/simple_state.hpp> #include "SuperState.hpp" class SuperState; class SubState: public boost::statechart::simple_state<SubState, SuperState> { public: SubState(){ std::cout<<"Enteres into SubState."<<std::endl; } }; #endif /**/

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Using lamdba for vector of array initialization
by Alexander Khomyak 09 Jun '11

09 Jun '11

Hi. I have vector of boost array: typedef boost::array<char, 10> array10; typedef std::vector<array10> vector_of_array10; vector_of_array10 v; v.resize(10); Now I initialize it using for statement: for(vector_of_array10::iterator i = v.begin(); i != v.end(); ++i) (*i)[0] = '\0'; How can I do the same initialization using lambda expression and for_each? In advance thank you very much for the tip.

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