June 2013 - Boost-users - lists.preview.boost.org

What is the status of the BGL-Python Bindings project
by lizy10b 19 Jun '13

19 Jun '13

Hi there, I would like to know what is the status of the BGL-Python Bindings project? The Boost 1.53 document says that "The Python bindings for the BGL are now part of a separate project" and links to http://www.osl.iu.edu/~dgregor/bgl-python/ On that page I find that the latest version is 0.9 which was released in 2005. So it means the BGL-Python Binding project is not on going? Is the BGL-Python Bindings 0.9 compatible to Boost 1.53 ? Or any other ways to use Boost graph functionalities in python? Thanks Zhiyu Li 2013-06-19 lizy10b

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[build] Problem building using Intel C++ compiler
by Jason 19 Jun '13

19 Jun '13

I'm trying to build v1.53 using the Intel C++ compiler and am having some problems. I'm issuing the following commands: ./bootstrap.sh --with-toolset=intel-linux ./b2 toolset=intel-linux Upon executing the second command, I get the following error: error: intel-linux initialization: parameter 'version' inconsistent error: no value was specified in earlier initialization error: an explicit value is specified now This appears to be similar to a mailing list thread regarding v1.39, archived here: https://groups.google.com/forum/#!topic/boost-list/gu9wf3cr15Y It appears that there is a workaround listed there (and a corresponding Trac ticket #3165) that involves hand-manipulation of bjam configuration files, but it seems like this is something that should work out of the box if Intel C++ is a supported toolset. Is there any chance that this would be fixed in the future? Jason -- View this message in context: http://boost.2283326.n4.nabble.com/build-Problem-building-using-Intel-C-com… Sent from the Boost - Users mailing list archive at Nabble.com.

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[BGL] null_vertex()
by Andreas Fabri 18 Jun '13

18 Jun '13

Hello, I am wondering what the function boost::graph_traits<G>::null_vertex() http://www.boost.org/doc/libs/1_53_0/libs/graph/doc/Graph.html is for, and why there is no equivalent function null_edge() best regards, andreas -- Andreas Fabri, PhD Chief Officer, GeometryFactory Editor, The CGAL Project phone: +33.492.954.912 skype: andreas.fabri

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[Test]: Problem with simple Boost.Test
by Damien Kick 17 Jun '13

17 Jun '13

I'm trying to get what I think should be a simple example of Boost.Test (Boost 1.53) to work but I'm getting a segmentation fault, having used other of the Boost libraries from the same build/install of 1.53 without any problems. Am I doing anything obviously wrong? Thanks in advance for any help. $ cat test/cma.cpp #define BOOST_TEST_MODULE cma #include <boost/test/unit_test.hpp> #include <iostream> #include <ostream> BOOST_AUTO_TEST_CASE(sanity) { std::clog << "Test the world!\n"; } $ make check [100%] Building CXX object CMakeFiles/test-cma.dir/test/cma.cpp.o Linking CXX executable test-cma [100%] Built target test-cma [100%] Built target check $ env DYLD_LIBRARY_PATH=${TARGET}/lib ./test-cma Running 1 test case... Test the world! Segmentation fault: 11 $ Here are some more details. I'm trying this on Mac with GCC. $ uname -a Darwin Damien-Kicks-MacBook-Pro.local 12.4.0 Darwin Kernel Version 12.4.0: \ Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 $ ${CXX} --version g++ (GCC) 4.8.0 Copyright (C) 2013 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I've compiled my build/install of Boost 1.53 with --std=c++0x. Again, I've used other libraries from this same build/install (DateTime, Filesystem, Random, Regex, Serialization, System, Thread), so I don't think that the problem is my use of --std=c++0x in and of itself. $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_test_exec_monitor.a \ ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma $ env DYLD_LIBRARY_PATH=${TARGET}/lib ./cma Running 1 test case... Test the world! Segmentation fault: 11 $ If I run this under GDB (gdb) run Starting program: cma Reading symbols for shared libraries ++++.............................. done Running 1 test case... Test the world! Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000 boost::unit_test::framework::get (id=65536, t=tut_case) at \ impl/framework.ipp:388 388 if( (res->p_type & t) == 0 ) (gdb) bt #0 boost::unit_test::framework::get (id=65536, t=tut_case) at \ impl/framework.ipp:388 #1 0x0000000100134805 in boost::unit_test::traverse_test_tree \ (suite=@0x100403f10, V=@0x7fff5fbff470) at framework.hpp:73 Previous frame inner to this frame (gdb could not unwind past this frame) (gdb) print res $1 = ('boost::unit_test::test_unit' *) 0x0 (gdb) ________________________________ This e-mail and any attachments are confidential. If it is not intended for you, please notify the sender, and please erase and ignore the contents.

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[filesystem] Create file with a unicode filename/path
by Konstantin Kronfeldner 17 Jun '13

17 Jun '13

Hello, I'm working under windows 7 with mingw. I have encountered some weird behaviour with unicode filenames. My program needs to be portable, and I'm using boost::filesystem (v 1.53) to handle the file paths. This has all been going well, until I needed to open files with unicode filenames. This is not about the content of the file, but the file's name/path. I tried the following: For testing I made a folder named C:\UnicodeTest\|????????|and I tried creating a file inside of it, by appending the file name test.txt to the boost wpath. For some reason the creation of the file fails. I'm using boost's fstreams and when I try to open the file, the failbit of the stream is set. Now the funny thing is, that when I append a foldername to the path instead, a call to create_directories() succeeds and creates the correct directory C:\UnicodeTest\|????????|\folder. I really don't understand why it won't work with a file. I have also posted my problem on stackoverflow. http://stackoverflow.com/questions/16875025/open-a-file-with-unicode-path No luck so far. This is the code I use: boost::filesystem::wpath path; // find the folder to test (There are no other folders in C:\UnicodeTest) boost::filesystem::wpath dirPath = "C:\\UnicodeTest"; vector<boost::filesystem::wpath> files; copy(boost::filesystem::directory_iterator(dirPath), boost::filesystem::directory_iterator(), back_inserter(files)); for(boost::filesystem::wpath &file : files) { if(boost::filesystem::is_directory(file)) { path = file; break; } } // create a path for the folder boost::filesystem::wpath folderPath = path / "folder"; // this works just fine boost::filesystem::create_directories(folderPath); // create a path for the file boost::filesystem::wpath filePath = path / "test.txt"; boost::filesystem::ofstream stream; // this fails stream.open(filePath); if(!stream) { cout << "failed to open file " << path << endl; } else { cout << "success" << endl; }

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Comparison boost spirit and ANTLR
by Olivier Austina 17 Jun '13

17 Jun '13

Hi, I would like to choose a parser. I would like to use a parser for text processing (natural language text). Which parser is suited in this case. In general which are the benefit to use boost spirit instead of ANTLR or ANTLR instead of boost spirit. Thank you. -- Regards Austina

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[statechart] state_machine send_event assertion fails
by Gooding, Dustin R. (JSC-ER411) 17 Jun '13

17 Jun '13

Hello, I'm a new user of statechart and for the most part am enjoying it very much. I've implemented a state machine with about 30 states (9 orthogonal regions) and over 50 events. It works very well and as expected, except for this one issue. Every once in a while, and in a way I've been unable to consistently repeat, I get an assertion failure resulting in a core dump. /usr/include/boost/statechart/state_machine.hpp:873: boost::statechart::detail::reaction_result boost::statechart::state_machine<MostDerived, InitialState, Allocator, ExceptionTranslator>::send_event(const event_base_type&) [with MostDerived = GripperPosition, InitialState = Container, Allocator = std::allocator<void>, ExceptionTranslator = boost::statechart::null_exception_translator, boost::statechart::state_machine<MostDerived, InitialState, Allocator, ExceptionTranslator>::event_base_type = boost::statechart::event_base]: Assertion `get_pointer( pOutermostUnstableState_ ) == 0' failed. "GripperPosition" is my state_machine. "Container" is the simple_state the state machine initially enters. Container has no transitions, but many sub states (it's the owner of the 9 orthogonal regions). (As far as I can tell, if the state machine is alive, then "Container" is an active state.) "Container" has a handful of custom_reactions that essentially listen for user-supplied events, "forward" those events in to the appropriate orthogonal regions using internal-only events, and then discard the user-supplied events. The intention here is to have a single event propagate to multiple orthogonal regions, allowing them all to react. For example: boost::statechart::result Container::react(const e_still&) { post_event(i_still_action()); post_event(i_still_moving()); return discard_event(); } I am unsure if these reactions are the cause of the assertion failure, but given that the error message says "Container" is the InitialState, I have to assume so. Given that, I don't see how either Container or GripperPosition are inactive and don't know how to interpret this error. I'd appreciate some guidance. I'm running Ubuntu 12.04, GCC 4.6.3, and Boost 1.46.1. -- Dustin Gooding NASA/JSC Robotics

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[multiprecision] noexcept() usage in gmp int
by Francesco Biscani 16 Jun '13

16 Jun '13

Hello, I was trying out the new multiprecision library (kudos!), and I ran into a problem. In order to make certain guarantees in my code regarding exception safety, I am mandating that types being used in generic containers are marked noexcept() for certain basic operations (namely, destruction and move operations). It seems like this is generally guaranteed in the multiprecision library (tried with cpp_int and the mpfr adaptor), with the important exception of the gmp integer class. A glance at the headers reveals that (gmp.hpp): // // Within this file, the only functions we mark as noexcept are those that manipulate // (but don't create) an mpf_t. All other types may allocate at pretty much any time // via a user-supplied allocator, and therefore throw. // Additionally, browsing the gmp documentation yields this snippet ( http://gmplib.org/manual/Custom-Allocation.html) """ There's currently no defined way for the allocation functions to recover from an error such as out of memory, they must terminate program execution. A longjmp or throwing a C++ exception will have undefined results. This may change in the future. """ Would it be possible then for the mp library authors to consider adding basic noexcept() guarantees to the gmp adaptor class in future versions? Cheers and thanks for the great library, Francesco.

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Building a large graph using Parallel Boost Graph Library
by William Shipman 15 Jun '13

15 Jun '13

Hi all, I'm working with a graph that has about 16 million vertices and 320 million edges. Currently, I'm using graph-tool in Python but building the graph is far too slow. Before I start porting to C++ I starting reading up on the Parallel Boost Graph Library. From the examples in the documentation, it seems that one must build the graph on one node in the cluster, then call synchronize to send that graph to all nodes. Is there a way to build parts of the graph on each node and then synchronize those parts? Some background: the graph actually comes from a CT scan. The vertices are voxels, the edges are relationships between adjacent voxels. At the moment I'm working on a very small test volume - 256^3 voxels - but later volumes will have billions of vertices and edges. Thanks for the help.

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Regarding boost interval library package.
by Pranjal vyas 15 Jun '13

15 Jun '13

Hello, I have written a program in boost which simply calculates the exponent in an interval, but for some interval inputs it is giving the wrong output such as for [1,3] or [-1,3]...but for some values it is giving correct o/p such as [1,9]. Please help in solving this query. The program is appended below.... ********************************************************************************************************************************************************* #include </boost/numeric/interval.hpp> #include <vector> #include <algorithm> #include <utility> #include <iostream> #include <iomanip> #include <math.h> using namespace boost; using namespace numeric; using namespace interval_lib; template<class T, class Policies> std::ostream &operator<<(std::ostream &os, const boost::numeric::interval<T, Policies> &x) { os << "[" << x.lower() << ", " << x.upper() << "]"; return os; } int main() { typedef interval<double,policies<save_state<rounded_transc_opp<double> >,checking_base<double> > > I; //typedef interval<double> I; I a(1,3.2); std::cout << exp(a) << std::endl; } ********************************************************************************************************************************************************** Thanks in Advance. Regards, PV

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http://www.boost.org/doc/libs/1_53_0/libs/serialization/example/demo.cpp does not work properly when using polymorphic xml archive
by Fadhel 14 Jun '13

14 Jun '13

Hi all, I used http://www.boost.org/doc/libs/1_53_0/libs/serialization/example/demo.cpp file as a first introduction to boost serialization. I would like to use polymorphic archives with XML serilialization format (to avoid having the templatized version). I edited this example and run it. Writing the data has worked fine -- except for the base_class serialization which needed an nvp -- but reading it causes a memory/segmentation fault problem. The same error happens with a binary archive. Using a text archive works fine. I'm new to boost serialization and debugging the code did not help me a lot. Is there anything specific to the serialization of base classes or abstract classes with the polymorphic XML format which needs to be handled? Or is this related to the serialization of pointers to the base class. Thanks for your help. Best Regards, Fadhel BA Here is the code I'm using: ( I removed some comments to make the code shorter) /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 // demo.cpp #include <cstddef> // NULL #include <iomanip> #include <iostream> #include <fstream> #include <string> #include <boost/archive/polymorphic_iarchive.hpp> #include <boost/archive/polymorphic_oarchive.hpp> #include <boost/archive/polymorphic_xml_iarchive.hpp> #include <boost/archive/polymorphic_xml_oarchive.hpp> #include <boost/archive/polymorphic_binary_iarchive.hpp> #include <boost/archive/polymorphic_binary_oarchive.hpp> #include <boost/archive/polymorphic_text_iarchive.hpp> #include <boost/archive/polymorphic_text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> #include <boost/serialization/assume_abstract.hpp> #include <boost/serialization/nvp.hpp> ///////////////////////////////////////////////////////////// // gps coordinate // // llustrates serialization for a simple type // class gps_position { friend std::ostream & operator<<(std::ostream &os, const gps_position &gp); friend class boost::serialization::access; int degrees; int minutes; float seconds; void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int /* file_version */) const { ar << BOOST_SERIALIZATION_NVP(degrees); ar << BOOST_SERIALIZATION_NVP(minutes); ar << BOOST_SERIALIZATION_NVP(seconds); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int /* file_version */) { ar >> BOOST_SERIALIZATION_NVP(degrees); ar >> BOOST_SERIALIZATION_NVP(minutes); ar >> BOOST_SERIALIZATION_NVP(seconds); } public: // every serializable class needs a constructor gps_position(){}; gps_position(int _d, int _m, float _s) : degrees(_d), minutes(_m), seconds(_s) {} }; std::ostream & operator<<(std::ostream &os, const gps_position &gp) { return os << ' ' << gp.degrees << (unsigned char)186 << gp.minutes << '\'' << gp.seconds << '"'; } ///////////////////////////////////////////////////////////// // One bus stop // // illustrates serialization of serializable members // class bus_stop { friend class boost::serialization::access; friend std::ostream & operator<<(std::ostream &os, const bus_stop &gp); virtual std::string description() const = 0; gps_position latitude; gps_position longitude; void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int version) const { ar << BOOST_SERIALIZATION_NVP(latitude); ar << BOOST_SERIALIZATION_NVP(longitude); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int version) { ar >> BOOST_SERIALIZATION_NVP(latitude); ar >> BOOST_SERIALIZATION_NVP(longitude); } protected: bus_stop(const gps_position & _lat, const gps_position & _long) : latitude(_lat), longitude(_long) {} public: bus_stop(){} virtual ~bus_stop(){} }; BOOST_SERIALIZATION_ASSUME_ABSTRACT(bus_stop) std::ostream & operator<<(std::ostream &os, const bus_stop &bs) { return os << bs.latitude << bs.longitude << ' ' << bs.description(); } ///////////////////////////////////////////////////////////// // Several kinds of bus stops // // illustrates serialization of derived types // class bus_stop_corner : public bus_stop { friend class boost::serialization::access; std::string street1; std::string street2; virtual std::string description() const { return street1 + " and " + street2; } void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int version) const { // save/load base class information ar << boost::serialization::make_nvp("base", boost::serialization::base_object<bus_stop>(*this)); ar << BOOST_SERIALIZATION_NVP(street1); ar << BOOST_SERIALIZATION_NVP(street2);; } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int version) { // save/load base class information ar >> boost::serialization::make_nvp("base", boost::serialization::base_object<bus_stop>(*this)); ar >> BOOST_SERIALIZATION_NVP(street1); ar >> BOOST_SERIALIZATION_NVP(street2); } public: bus_stop_corner(){} bus_stop_corner(const gps_position & _lat, const gps_position & _long, const std::string & _s1, const std::string & _s2 ) : bus_stop(_lat, _long), street1(_s1), street2(_s2) { } }; class bus_stop_destination : public bus_stop { friend class boost::serialization::access; std::string name; virtual std::string description() const { return name; } void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int version) const { ar << boost::serialization::make_nvp("base", boost::serialization::base_object<bus_stop>(*this)); ar << BOOST_SERIALIZATION_NVP(name); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int version) { ar >> boost::serialization::make_nvp("base", boost::serialization::base_object<bus_stop>(*this)); ar >> BOOST_SERIALIZATION_NVP(name); } public: bus_stop_destination(){} bus_stop_destination( const gps_position & _lat, const gps_position & _long, const std::string & _name ) : bus_stop(_lat, _long), name(_name) { } }; ///////////////////////////////////////////////////////////// // a bus route is a collection of bus stops // // illustrates serialization of STL collection templates. // // illustrates serialzation of polymorphic pointer (bus stop *); // class bus_route { friend class boost::serialization::access; friend std::ostream & operator<<(std::ostream &os, const bus_route &br); typedef bus_stop * bus_stop_pointer; std::list<bus_stop_pointer> stops; void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int version) const { // in this program, these classes are never serialized directly but rather // through a pointer to the base class bus_stop. So we need a way to be // sure that the archive contains information about these derived classes. //ar.template register_type<bus_stop_corner>(); ar.register_type(static_cast<bus_stop_corner *>(NULL)); //ar.template register_type<bus_stop_destination>(); ar.register_type(static_cast<bus_stop_destination *>(NULL)); // serialization of stl collections is already defined // in the header ar << BOOST_SERIALIZATION_NVP(stops); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int version) { ar.register_type(static_cast<bus_stop_corner *>(NULL)); ar.register_type(static_cast<bus_stop_destination *>(NULL)); // in the header ar >> BOOST_SERIALIZATION_NVP(stops); } public: bus_route(){} void append(bus_stop *_bs) { stops.insert(stops.end(), _bs); } }; std::ostream & operator<<(std::ostream &os, const bus_route &br) { std::list<bus_stop *>::const_iterator it; // note: we're displaying the pointer to permit verification // that duplicated pointers are properly restored. for(it = br.stops.begin(); it != br.stops.end(); it++){ os << '\n' << std::hex << "0x" << *it << std::dec << ' ' << **it; } return os; } ///////////////////////////////////////////////////////////// // a bus schedule is a collection of routes each with a starting time class bus_schedule { public: // note: this structure was made public. because the friend declarations // didn't seem to work as expected. struct trip_info { void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int file_version) const { // in versions 2 or later if(file_version >= 2) // read the drivers name ar << BOOST_SERIALIZATION_NVP(driver); // all versions have the follwing info ar << BOOST_SERIALIZATION_NVP(hour); ar << BOOST_SERIALIZATION_NVP(minute); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int file_version) { // in versions 2 or later if(file_version >= 2) // read the drivers name ar >> BOOST_SERIALIZATION_NVP(driver); // all versions have the follwing info ar >> BOOST_SERIALIZATION_NVP(hour); ar >> BOOST_SERIALIZATION_NVP(minute); } // starting time int hour; int minute; // only after system shipped was the driver's name added to the class std::string driver; trip_info(){} trip_info(int _h, int _m, const std::string &_d) : hour(_h), minute(_m), driver(_d) {} }; private: friend class boost::serialization::access; friend std::ostream & operator<<(std::ostream &os, const bus_schedule &bs); friend std::ostream & operator<<(std::ostream &os, const bus_schedule::trip_info &ti); std::list<std::pair<trip_info, bus_route *> > schedule; void serialize(boost::archive::polymorphic_oarchive &ar, const unsigned int version) const { ar << BOOST_SERIALIZATION_NVP(schedule); } void serialize(boost::archive::polymorphic_iarchive &ar, const unsigned int version) { ar >> BOOST_SERIALIZATION_NVP(schedule); } public: void append(const std::string &_d, int _h, int _m, bus_route *_br) { schedule.insert(schedule.end(), std::make_pair(trip_info(_h, _m, _d), _br)); } bus_schedule(){} }; BOOST_CLASS_VERSION(bus_schedule, 2) std::ostream & operator<<(std::ostream &os, const bus_schedule::trip_info &ti) { return os << '\n' << ti.hour << ':' << ti.minute << ' ' << ti.driver << ' '; } std::ostream & operator<<(std::ostream &os, const bus_schedule &bs) { std::list<std::pair<bus_schedule::trip_info, bus_route *> >::const_iterator it; for(it = bs.schedule.begin(); it != bs.schedule.end(); it++){ os << it->first << *(it->second); } return os; } void save_schedule(const bus_schedule &s, const char * filename){ // make an archive std::ofstream ofs(filename); boost::archive::polymorphic_xml_oarchive oa(ofs); oa << s; } void restore_schedule(bus_schedule &s, const char * filename) { // open the archive std::ifstream ifs(filename); boost::archive::polymorphic_xml_iarchive ia(ifs); // restore the schedule from the archive ia >> s; } int main(int argc, char *argv[]) { // make the schedule bus_schedule original_schedule; // fill in the data // make a few stops bus_stop *bs0 = new bus_stop_corner( gps_position(34, 135, 52.560f), gps_position(134, 22, 78.30f), "24th Street", "10th Avenue" ); bus_stop *bs1 = new bus_stop_corner( gps_position(35, 137, 23.456f), gps_position(133, 35, 54.12f), "State street", "Cathedral Vista Lane" ); bus_stop *bs2 = new bus_stop_destination( gps_position(35, 136, 15.456f), gps_position(133, 32, 15.300f), "White House" ); bus_stop *bs3 = new bus_stop_destination( gps_position(35, 134, 48.789f), gps_position(133, 32, 16.230f), "Lincoln Memorial" ); // make a routes bus_route route0; route0.append(bs0); route0.append(bs1); route0.append(bs2); // add trips to schedule original_schedule.append("bob", 6, 24, &route0); original_schedule.append("bob", 9, 57, &route0); original_schedule.append("alice", 11, 02, &route0); // make aother routes bus_route route1; route1.append(bs3); route1.append(bs2); route1.append(bs1); // add trips to schedule original_schedule.append("ted", 7, 17, &route1); original_schedule.append("ted", 9, 38, &route1); original_schedule.append("alice", 11, 47, &route1); // display the complete schedule std::cout << "original schedule"; std::cout << original_schedule; std::string filename("C:/Dev/XML"); filename += "/demofile.xml"; // save the schedule save_schedule(original_schedule, filename.c_str()); // ... some time later // make a new schedule bus_schedule new_schedule; std::cout << "\n\nstarting restored schedule"; restore_schedule(new_schedule, filename.c_str()); // and display std::cout << "\nrestored schedule"; std::cout << new_schedule; // should be the same as the old one. (except for the pointer values) delete bs0; delete bs1; delete bs2; delete bs3; return 0; }

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Boost 32-64
by Dave Dyer 14 Jun '13

14 Jun '13

This is sort of a final report to thank the list for several good pieces of advice. I'm just completing a project which uses boost libraries to assist a project which uses shared memory to communicate between a 64 bit process and a separate 32 bit Application. Trying to use the managed version of shared memory proved to be too unreliable. Doing so is advertized as "experimental" and it proved not ready for prime time. I succeeded by using only the very simplest, unmanaged versions of boost shared memory and managing my own memory, very carefully, to be sure the shared structures were identical on the 32 and 64 bit sides of the divide.

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[unordered] order in container
by gast128 14 Jun '13

14 Jun '13

Hello all, although it's called 'unordered_set', it surprised me that an unordered container could have a different ordering although its contents are the same: void f() { boost::unordered_set<int> uset1; uset1.insert(10); uset1.insert(9); uset1.insert(8); boost::unordered_set<int> uset2; uset2.insert(8); uset2.insert(9); uset2.insert(10); //uset1: 8, 9, 10 //uset2: 10, 9, 8 bool b = uset1 == uset2; //ok, they are the same } Maybe it is somewhere in the documentation, otherwise maybe add a documentation note.

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[accumulator] compiler error with quantil
by Philipp Kraus 14 Jun '13

14 Jun '13

Hello, I try to create a complex accumulator. I would like to use an accumulator for a box plot with the whisker data ( http://en.wikipedia.org/wiki/Box_plot ). My typedef shows at the momen like this: typedef boost::accumulators::accumulator_set<double, boost::accumulators::stats< boost::accumulators::tag::count, boost::accumulators::tag::sum, //boost::accumulators::tag::median, boost::accumulators::tag::mean, boost::accumulators::tag::variance, boost::accumulators::tag::min, boost::accumulators::tag::max, boost::accumulators::tag::extended_p_square > > Accumulator; I would like to create the 25% & 75% quantil and replace the median with the 50% quantil, so I have defined the ctor accumulator call like this: boost::array<double, 3> probs = {0.25, 0.5, 0.75}; m_times[p_name] = Accumulator( boost::accumulators::extended_p_square_probabilities = probs ); (the median is disabled and m_times is a std::map<std::string, Accumulator>). At this point I get a compiler errors: /Developer/opt/Boost/1.53.0/include/boost/accumulators/statistics/extended_p_square.hpp: In constructor 'boost::accumulators::impl::extended_p_square_impl<Sample>::extended_p_square_impl(const Args&) [with Args = boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator, boost::accumulators::accumulator_set<double, boost::accumulators::stats<boost::accumulators::tag::count, boost::accumulators::tag::sum, boost::accumulators::tag::mean, boost::accumulators::tag::variance, boost::accumulators::tag::min, boost::accumulators::tag::max, boost::accumulators::tag::extended_p_square, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, void> >, boost::parameter::aux::empty_arg_list>, Sample = double]': /Developer/opt/Boost/1.53.0/include/boost/accumulators/framework/depends_on.hpp:319: instantiated from 'boost::accumulators::detail::accumulator_wrapper<Accumulator, Feature>::accumulator_wrapper(const Args&) [with Args = boost::parameter::aux::arg_list<boost::parameter::aux::tagged_argument<boost::accumulators::tag::accumulator, boost::accumulators::accumulator_set<double, boost::accumulators::stats<boost::accumulators::tag::count, boost::accumulators::tag::sum, boost::accumulators::tag::mean, boost::accumulators::tag::variance, boost::accumulators::tag::min, boost::accumulators::tag::max, boost::accumulators::tag::extended_p_square, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na, mpl_::na>, void> >, boost::parameter::aux::empty_arg_list>, Accumulator = boost::accumulators::impl::extended_p_square_impl<double>, Feature = boost::accumulators::tag::extended_p_square]' .... I need one accumulator for all the data. I'm using Boost 1.53. How can I create working code? Thanks for help Phil

2 3

Any debugging tips for Boost Interprocess shared memory crashes?
by Warren Postma 14 Jun '13

14 Jun '13

I am a newly humbled mediocre C++ programmer, who is completely unable to figure out why Boost interprocess shared memory classes frequently freeze or crash both at creation and deletion of the manager objects, both with the persistent and the windows-only non persistent versions of the classes. Do you ever debug things and it all just gets worse and worse the longer you try to fix it? http://stackoverflow.com/questions/17100597/does-boostinterprocesswindows-s… Today I am getting crashes in the boost shared memory manager object destructor, or deadlocks in WMI calls. It's in Boost 1.53, on Visual C++ 2008, and involves DLLs. I am unable to reproduce the insanity at a top level EXE demo, and I tried to build a exe-loads DLL1, which loads DLL2, which creates boost objects, which fail when you destroy them, but I am unable to extricate it from my project. So it could be one of the lovely compiler or linker or project settings in my Visual C++ project, something about Multithreaded Debug DLL and MFC and ATL and all the billion varieties of weird RTL and heap bugs that lurk in Visual C++ runtime libraries. I am not blaming boost, but I am at wits end here. I have about 80 hours into debugging this and it's only getting worse the more I look at it. After this I promise to go away, perhaps drink myself silly, and never ever again try to use C++ or boost. Or Windows. Because for all I know this could be a windows SxS issue with Visual Studio 2008 and its lovely assortment of DLLs and runtime SxS insanity. Warren

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boost 1.49.0 on Redhat 5.2 link issues
by Stefan Schwarzer 13 Jun '13

13 Jun '13

Dear everybody, we need to backport boost 1.49.0 to Redhat 5.2. b2 ; b2 install --prefix=/usr/local succeeds and installs libraries and headers in /usr/local as requested (g++ 4.1.2-42, 32 bit PAE kernel). However, we have a problem even linking a mostly trivial example: #include <boost/filesystem.hpp> int main () { copy_file(boost::filesystem::path("atest"), boost::filesystem::path("btest")); } $ g++ testBoost.cpp -lboost_filesystem -lboost_system /tmp/cc10doAS.o: In function `boost::filesystem3::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&)': testBoost.cpp: (.text._ZN5boost11filesystem39copy_fileERKNS0_4pathES3_[boost::filesystem3::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&)]+0x24): undefined reference to `boost::filesystem3::detail::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&, boost::filesystem3::copy_option::enum_type, boost::system::error_code*)' collect2: ld returned 1 exit status The symbol is present in /usr/local/lib/libboost_filesystem and ldconfig does know about its location (see below). Also, trying to link statically or adding -pthread does not change the situation. We are desperate for advice... Roald and Stefan. $ nm -C /usr/local/lib/libboost_filesystem.so | grep 'boost::filesystem3::detail::copy_file' 00010ae0 T boost::filesystem3::detail::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&, boost::filesystem3::copy_option::enum_type, boost::system::error_code*) $ cat /etc/ld.so.conf include ld.so.conf.d/*.conf /usr/local/lib

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boost::thread::attributes reference overload?
by Anthony Foiani 13 Jun '13

13 Jun '13

Greetings. I have a class that wraps a boost::thread object, and I would like to specify certain thread attributes at construction time. My first attempt looked basically like this: struct my_thread { static boost::thread::attributes getThreadAttr() { boost::thread::attributes attrs; attrs.set_stack_size( 256 * 1024 ); return attrs; } my_thread( Runnable func ) : thread_( getThreadAttr(), func ) {} boost::thread thread_; }; But that fails: g++ -std=c++0x -o thread-attr thread-attr.cpp \ -lboost_thread-mt -lboost_system -pthread ... /usr/include/boost/thread/detail/thread.hpp:191:9: note: \ template argument deduction/substitution failed: thread-attr.cpp:48:42: note: cannot convert ‘my_thread::getThreadAttr()()’ (type \ ‘boost::thread::attributes {aka boost::thread_attributes}’) to type ‘boost::thread::attributes& {aka boost::thread_attributes&}’ Replacing 'getThreadAttr' with a method that returns a non-const reference to internal static variables allows the program to compile and run successfully: static boost::thread::attributes & getThreadAttr() { static boost::thread::attributes attrs; static bool init = false; if ( ! init ) { attrs.set_stack_size( 256 * 1024 ); init = true; } return attrs; } The full program, with Linux compile lines, can be found at the bottom of this message and also at: http://foiani.home.dyndns.org/~tony/boost/thread-attr.cpp I did find a closely-related question on StackOverflow: http://stackoverflow.com/questions/13868619 Where Vicente replied (http://stackoverflow.com/a/13894968/784478) The needed overload template <class F, class Arg, class ...Args> thread(attributes const& attrs, F&& f, Arg&& arg, Args&&... args) is defined only if the compiler supports variadic templates and rvalue references. This could explain your problem. I guess the documentation could be improved to signal this clearly. Please could you create a Trac ticket to follow this issue? However, the compiler I'm using (g++ 4.7.2) has supported both of these features for years. According to this page: http://gcc.gnu.org/projects/cxx0x.html g++ has supported both of these features since 4.3. Josef_K (on freenode IRC #boost channel) was kind enough to try the sample code in their own environment, and they encountered the same errors on both g++ 4.8.1 and clang 3.4. The most likely explanation is that I'm doing something stupid. If anyone has the time to hit me with the clue-by-four, I would appreciate it. There is the possibility that Boost.Thread v4 fixes this (I'm on 1_51_0, which is Boost.Thread v3.0.1). I'd rather not try to transition libraries at this point, but if it has been fixed, confirmation would be welcome. For now, I'll most likely implement the "return reference to internal static" method in my project. It's a bit racy, but since I do all my thread creation through this one routine, I should be able to manage it. Anyway. I'm left feeling that there is a gap somewhere; whether it's in my understanding, in the older version of Boost.Threads, in compiler support / quirks, or elsewhere, I don't know. Regardless, thanks for the excellent library, and happy hacking! Best regards, Anthony Foiani Sample program follows: ======================================================================== // this should work: // g++ -std=c++0x -o thread-attr thread-attr.cpp -lboost_thread-mt -lboost_system -pthread // // this explodes: // g++ -std=c++0x -o thread-attr thread-attr.cpp -DRVALUE_REFERENCE_DOOM -lboost_thread-mt -lboost_system -pthread #include <iostream> #include <boost/function.hpp> #include <boost/thread.hpp> typedef boost::function< void ( void ) > Runnable; struct my_thread { #ifdef RVALUE_REFERENCE_DOOM // this doesn't work. static boost::thread::attributes getThreadAttr() { boost::thread::attributes attrs; attrs.set_stack_size( 256 * 1024 ); return attrs; } #else // this does work, but needs more structure before it can be // considered safe. static boost::thread::attributes & getThreadAttr() { static boost::thread::attributes attrs; static bool init = false; if ( ! init ) { attrs.set_stack_size( 256 * 1024 ); init = true; } return attrs; } #endif my_thread( Runnable func ) : thread_( getThreadAttr(), func ) {} void join() { thread_.join(); } boost::thread thread_; }; void foo() { std::cout << "foo!" << std::endl; } int main( int argc, char * argv [] ) { my_thread t( foo ); t.join(); return 0; }

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Re: [Boost-users] [multi_index] emplace support
by Brian Wood 13 Jun '13

13 Jun '13

> The sad reality is I have very limited time to devote to evolving the > library, so this thing, although in principle simple to implement, has > been procrastinated for years now. Maybe if you sketch the first step that needs to be done here on the list someone will do that and then you can repeat for each step. Whoever would be willing to do this should ask the questions they have here, because there are a number of others on this list who can answer at least some of the questions. A tip to someone willing to do this: Boost Container has emplace support: http://www.boost.org/doc/libs/1_53_0/doc/html/container/move_emplace.html#c… so studying that implementation might be helpful. -- Brian Wood Ebenezer Enterprises http://webEbenezer.net (651) 251-9384

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Output libs to specified folder
by Christopher Pisz 12 Jun '13

12 Jun '13

How can I tell boost to put the libraries in a directory that I specify? If I change stage-dir, it still appends /lib onto it. Is this possible? I want my libraries in C:\trunk\third_party\ Not in C:\trunk\third_party\lib Here is my build script: cd ..\boost SET PATH=$(PATH);..\bjam bjam.exe --stagedir=../../third_party --with-thread toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-date_time toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-system toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-regex toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-program_options toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage bjam.exe --stagedir=../../third_party --with-filesystem toolset=msvc-9.0 link=static threading=multi runtime-link=shared variant=debug stage

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[chrono] Initializing system_clock from microseconds
by Kelly, Dan 12 Jun '13

12 Jun '13

I have been having some difficulty initializing a chrono::system_clock::time_point object. Specifically, I am trying to load a time stamp from a .pcap file using libpcap. I have a structure, pcap_pkthdr, which contains two fields: struct timeval { long tv_sec; /* seconds */ long tv_usec; /* and microseconds */ }; struct pcap_pkthdr { struct timeval ts; /* time stamp */ bpf_u_int32 caplen; /* length of portion present */ bpf_u_int32 len; /* length this packet (off wire) */ }; Where tv_sec and tv_usec are seconds and microseconds respectively relative to an epoch of Jan 1, 1970. I can use system_clock::from_time_t() to initialize the time_point to an 64-bit integer seconds (std:time_t). The question is, how do I add the microseconds to this value? My latest attempt is: void my_class::calculate_packet_statistics( const struct pcap_pkthdr *header ) { frame_interval_.intervalTimeStamp_ = system_clock::from_time_t( static_cast<time_t>( header->ts.tv_sec ) ); frame_interval_.intervalTimeStamp_ += microseconds( header->ts.tv_usec ); // This is the problematic line ... } However, this appears to simply add tv_usec to the internal representation of the time_point. The internal representation appears to be in 100ns ticks with an epoch other than Jan 1, 1970. This is on a windows x64 build but the same code will have to work on Linux as well. As a side note, I later do some date calculations using system_clock::to_time_t. I lose my fractional seconds here But since I am only working with dates, this is not a problem. Dan Kelly dan.kelly(a)sig.com ________________________________ IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.

2 4

Question about the segfault in path::imbue that is being worked on at the moment
by Lars Hagström 12 Jun '13

12 Jun '13

Hi, I'm being bitten by the bug discussed here http://boost.2283326.n4.nabble.com/filesystem-segfault-in-path-imbue-after-… I'm encountering this when using boost 1.50. I have to support multiple boost versions, so I may bump into this in other versions as well. >From looking at the commit logs of boost svn I see that this is being worked on at the moment. But I would like to know what versions this bug affect, and if there are any ideas for a workaround. To me it looks like it affects most versions of boost filesystem, and I have been unable to come up with a workaround other than removing all use of filesystem in any place that could be called before main() has started. I would really like not having to do that! We use it quite a lot during static initialization... I've tried calling imbue(...) and codecvt() manually before using path, but that doesnt really help. The path_locale is in an anonymous namespace, which stops me from initializing it myself... Any other ideas? Sincerely Lars

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[Interprocess] Interest in a NamedPipe component
by Geoff Shannon 11 Jun '13

11 Jun '13

Hey all, I'm in the early stages of planning an independent study for my CS program and what I'm hoping to do is write a Boost.Interprocess compatible implementation of NamedPipe. However, I don't want what I create to be too closely tied to what I personally want to use. So, if you have any possible interest in utilizing such a feature, please respond and we can chat a bit about what the desirable semantics might be. Specifically I'm interested in comments on what kind of persistence people would lke, and thoughts about whether the stream should be message oriented or not (or optionally so). (see http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/some_basic_expla… for more info about what I mean by persistence). Right now, my conception of what the key features of a NamedPipe implementation would be is a stream/message oriented communication channel between to unrelated processes. thanks! -- Geoff Nothing is ever easy.

1 0

quantil
by Philipp Kraus 11 Jun '13

11 Jun '13

Hello, I would like to create a box plot and use the static calls of the boost. Median / average etc works well, but I need also the 25% & 75% quantil of my data, I'm using a boost::accumulators::accumulator_set for calculating statistical data. Can I / How can I use this for the quantil calculation or should I do this myself? Thanks Phil

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asio 1.43 ssl client certificate failure
by Stephan Menzel 11 Jun '13

11 Jun '13

Hello all, I am struggling with a bit of an esoteric question and have been debugging for days now. Basically, I am outfitting an existing app with asio based ssl HTTPS. Clients will have to use client authentication. Have my own root CA that signs both client and server certs. Extensive debugging using OpenSSL's s_client and s_server tools shows that the certificate trust chain etc is OK. Server side works fine with browsers, requests client certificate from browsers and only allows access if present. Alas, I can't get the client side to work. in boost 1.43 asio did not yet have any verification callbacks but it does have this: m_ssl_context.set_options( asio::ssl::context::tlsv1_client | asio::ssl::context::default_workarounds ); m_ssl_context.set_verify_mode( asio::ssl::context::verify_peer ); m_ssl_context.load_verify_file( myrootca ); m_ssl_context.use_certificate_file( myclient_cert, asio::ssl::context::pem ); m_ssl_context.use_private_key_file( myclient_key, asio::ssl::context::pem ); When I debug this using openssl s_server I see the connection failing with this message: ... SSL_accept:SSLv3 write certificate request A SSL_accept:SSLv3 flush data read from -0x7ff81be0 [-0x7ff8e2dd] (5 bytes => 5 (0x5)) 0000 - 16 03 01 00 07 ..... read from -0x7ff81be0 [-0x7ff8e2d8] (7 bytes => 7 (0x7)) 0000 - 0b 00 00 03 .... 0007 - <SPACES/NULS> write to -0x7ff81be0 [-0x7ff77a80] (7 bytes => 7 (0x7)) 0000 - 15 03 01 00 02 02 28 ......( SSL3 alert write:fatal:handshake failure SSL_accept:error in SSLv3 read client certificate B 2675716:error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate:s3_srvr.c:3274: ACCEPT A s_client or browser with the exact same keys can connect. Only asio fails and only on the client. Debugging shows that the client won't send the requested SSL certificates to the server. Also, when I register a verification callback in the impl like that: SSL_CTX *ctx = m_ssl_context.impl(); SSL *ssl = m_ssl_socket.impl()->ssl; SSL_CTX_set_client_cert_cb(ctx, &client_certificate_callback); and always return 1 in the callback, it still fails. Unfortunately I cannot upgrade to a post-war boost version and cannot touch OpenSSL either. It is on Windows here and uses OpenSSL 0.9.8i as far as I can see. Am I screwed? Or does anyone have an idea? Much appreciated? Stephan

2 2

[program_options] Can I use shorthand options with more than one char?
by Stefan Köhnen 10 Jun '13

10 Jun '13

Hello, I am currently migrating an old application with some weird command-line arguments. While using Boost program_options, I try to keep some of those arguments from the old version of the application, to assure the compatibility of some user scripts. My problem is that I couldn't find a way to add shorthand options with two or more characters. For example, if I add: ("testOption,to", "This is just a test-option") to the options_description, I only get -t as the shorthand for testOption. Is there some way to use longer shorthand options? Greetings, Stefan Köhnen

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