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Re: [Boost-users] statechart comparison
by Andreas Huber 01 Apr '09

01 Apr '09

Hi Brent > Is it still the case that boost statecharts require allocation and > destruction of a state object when entering and exiting that state? More precisely, the library issues "new State" upon state entry & and "delete State" upon state exit. So state construction & destruction *are* required but calls to global operator new and delete are not. The latter can be avoided by replacing operator new for your states or, on a more general level by passing a custom allocator to the state machine. Boost.Statechart was designed for reactive systems, where state machines are often serviced by dedicated threads. In such a scenario, the inter-thread communication usually introduces a much higher overhead than state construction & destruction. Regards, -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.

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Re: [Boost-users] boost.statechart - a data driven state machine
by Andreas Huber 01 Apr '09

01 Apr '09

[snip] > I'd like this state machine to be completely data driven because it will > massively simplify testing and experimenting with different behaviours (ie. > I won't have to re-compile and produce new executables to try out a simple change). > > Instead of hard-coding all the states, events, transitions, etc., I would like > to read all those in from a config file (text, csv, xml, whatever). Boost.Statechart deliberately does not support dynamic configurability. The rationale can be found here: <http://www.boost.org/doc/libs/1_38_0/libs/statechart/doc/rationale.html#Dyn…> Regards, -- Andreas Huber When replying by private email, please remove the words spam and trap from the address shown in the header.

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mpl::for_each state
by Skelly, Luke 01 Apr '09

01 Apr '09

Please ignore my last message. I somehow accidentally sent it while still editing! I am trying to create a std::map from an mpl::map. I've been trying to figure out how to use mpl::for_each to accomplish this. The problem I have is that the runtime function is passed to for_each by value and returns void. All the examples I've seen for mpl::for_each involve printing and not creating any new objects. Here is the attempt I've made: // creates std::map<size_t,size_t> from mpl::map<size_t,size_t> template<typename TypeMap> struct MapMaker { typedef std::map<size_t, size_t> map_type; map_type func_map; MapMaker() { boost::mpl::for_each<TypeMap>(*this); } template<typename U> void operator()(U x) { func_map[U::first::value]=U::second::value; } func_type operator[](size_t i) { return func_map[i]; } }; typedef boost::mpl::map< boost::mpl::pair<boost::mpl::size_t<1>, boost::mpl::size_t<2> >, boost::mpl::pair<boost::mpl::size_t<2>, boost::mpl::size_t<24> >, > myMap; int main() { MapMaker<myMap> m; size_t result = m[1]; } Of course this is a simplified version of what I'm really trying to do, which is create a map to function pointers. The problem is in the call to mpl::for_each in the MapMaker constructor. The std::map is created, but never returned. I've considered making func_map static, but that complicates things quite a bit, especially since MapMaker it is a class template. Luke Skelly

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How to build signals2 with bjam?
by Stefan Funck 01 Apr '09

01 Apr '09

Hi all, I just checked out the current release from subversion and tried to build the signals2 lib with bjam --toolset=msvc --build-type=complete --with-signals2 stage but receive the message error: wrong library name 'signals2' in the --with-<library> option Building e.g. the thread or signals lib works fine. Does bjam have a list of "valid" libraries it checks against and signals2 is not yet contained in, or what am I doing wrong? Thanks for any help! Stefan

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boost::regex ++ sequence is invalid
by jc 01 Apr '09

01 Apr '09

Hi, This is a carry over from the wrong group(boost build). In short the "+ +" sequence is invalid in boost::regex and valid in PRCE via an addition made to Perl 5.10. So, I am porting regular expressions that are used in PRCE and having trouble getting around this limitation in boost::regex. snip1: const boost::regex regex_username_password( "(" "(?:" "[a-zA-Z0-9_.!~*'()&=+$,;?/-]++" "|" "%[0-9a-fA-F]{2}" ")+" ")" "(?:" ":" "(" "(?:" "[a-zA-Z0-9_.!~*'()&=+$,-]++" "|" "%[0-9a-fA-F]{2}" ")*" ")" ")?" "@" ); snip2: const boost::regex regex_url_params("\\s*;([^?>]++)"); Help! -s7

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Compiling Boost 1.38.0 with xlc 8.0 (Linux 64)
by Matthieu Brucher 01 Apr '09

01 Apr '09

Hi, I'm trying to use Boost on a PowerPC with IBM's compiler. Is there a .jam somewhere to use? Matthieu -- Information System Engineer, Ph.D. Website: http://matthieu-brucher.developpez.com/ Blogs: http://matt.eifelle.com and http://blog.developpez.com/?blog=92 LinkedIn: http://www.linkedin.com/in/matthieubrucher

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Socket iostream Question
by Anthrope 01 Apr '09

01 Apr '09

Hello all, I am developing a high-performance socket-based application using the boost asio library. The application implements a binary tcp-based protocol that a bi-directional exchange of fixed-size messages. To simplify the coding while not sacrificing flexibility or performance, I decided to use the TCP iostream classes. The approach seems to work well, and I like the fact that the streams are buffered and allow me control over when I flush them. There's one minor issue that I thought I would seek some guidance on: Diagnosing and reporting failures connecting to servers are problematic. Basically, if a connect fails, the only way to know about it is to check the fail bit of the iostream. It would be nice to know why a client is unable to connect. So, to that end, I thought I could construct the iostream object via the default constructor, grab its streambuf via the rdbuf() call and in turn grab a basic_socket object reference to the streambuf and then call connect() on it, i.e., tcp::iostream iStream ; boost::asio::basic_socket_streambuf<tcp>& buf(*(iStream.rdbuf())); boost::asio::basic_socket<tcp, stream_socket_service<tcp> >& mySock(buf) ; mySock.connect(endPoint, error) ; The call to connect() on mySock with the error_code argument enables me to the diagnose and report connection problems a bit better. Once the connection is established, we can resume using the iostream directly. I would like to hear from you as to whether this approach makes sense, and what the pitfalls might be. And, alternative approaches would be most welcome too! Thanks in advance, Prashanth Nandavanam -- View this message in context: http://www.nabble.com/Socket-iostream-Question-tp22805249p22805249.html Sent from the Boost - Users mailing list archive at Nabble.com.

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Is boost license GPL compatible?
by Tommy Nordgren 31 Mar '09

31 Mar '09

That is, is it possible to distribute a library distributed under the boost license together with a software package distributed under the GPL. ----------------------------------- See the amazing new SF reel: Invasion of the man eating cucumbers from outer space. On congratulations for a fantastic parody, the producer replies : "What parody?" Tommy Nordgren tommy.nordgren(a)comhem.se

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zip_iterator and sTL algorithms like random_shuffle
by Andreas Fabri 31 Mar '09

31 Mar '09

Hello, I have two vectors and want to random_shuffle them the same way using the zip_iterator. I thought the code below would do it, but when I execute it I see that both sequences get screwded up. What do I wrong? Best regards, andreas #include <vector> #include <boost/iterator/zip_iterator.hpp> #include <algorithm> #include <iostream> int main() { std::vector<int> I(8), J(8); for(int i = 0; i < I.size(); i++){ I[i] = J[i] = i; } std::random_shuffle(boost::make_zip_iterator(boost::make_tuple(I.begin(), J.begin())), boost::make_zip_iterator(boost::make_tuple(I.end(), J.end()))); for(int i = 0; i < I.size(); i++){ std::cout << I[i] << " " << J[i] << std::endl; } return 0; }

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[Q] scoped_ptr for forward declared classes
by V S P 31 Mar '09

31 Mar '09

Hello I have a situation where I have struct cmoney_impl_dtl; //hidden impl is in Cpp file struct myclass { boost::scoped_ptr<hidden_impl> myimpl_ptr; } The compiler complains that the struct hidden_impl must be fully defined in the header file (which I cannot do) ------------- c:\usr\local\boost.msvc2008\boost_1_38_0\boost\checked_delete.hpp(32) : error C2027: use of undefined type 'cmoney_impl_dtl' c:\dbt_money.hpp(38) : see declaration of 'cmoney_impl_dtl' c:\usr\local\boost.msvc2008\boost_1_38_0\boost\scoped_ptr.hpp(80) : see reference to function template instantiation 'void boost::checked_delete<T>(T *)' being compiled ------------- is there a way around this? I was trying to use shared_ptr there, but MSVC reports memory leak on those objects... so I must be doing something wrong there , and therefore just wanted to try a simple ptr. thanks in advance, Vlad -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - Same, same, but different...

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