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[Boost-serialization] undefined reference error
by phillip mobley 19 Oct '18

19 Oct '18

Hello all, I ma having a major issue with the boost library. I have been having this issue for a few days now and I can't seem to figure out what the problem is. Basically, I get this error message after my linker: "undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::string const&)'" My complete linker command is as follows: " -L. -L/usr/lib/x86_64-linux-gnu -L/usr/local/lib -L/usr/lib/lapack -lfreetype -lGLEW -llapack -lboost_serialization -lglut -lGL -lGLU -L/usr/local/lib -pthread -lwx_gtk2u_xrc-3.1 -lwx_gtk2u_stc-3.1 -lwx_gtk2u_richtext-3.1 -lwx_gtk2u_ribbon-3.1 -lwx_gtk2u_propgrid-3.1 -lwx_gtk2u_aui-3.1 -lwx_gtk2u_gl-3.1 -lwx_gtk2u_html-3.1 -lwx_gtk2u_qa-3.1 -lwx_gtk2u_adv-3.1 -lwx_gtk2u_core-3.1 -lwx_baseu_xml-3.1 -lwx_baseu_net-3.1 -lwx_baseu-3.1" I built Boost 1.64 from the source and kept the default values. I also built the whole library. My Boost library is built into the /usr/local folder. I am pretty sure that I am referencing the linker libraries correctly but I can't seem to figure out why I would be getting this error message. Has anyone had an issue similar to this before?

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[Boost.Serialization] Unnecessary use of <iostream> in boost/serialization/export.hpp
by dariomt＠gmail.com 18 Oct '18

18 Oct '18

Hi, I see #include <iostream> in header boost/serialization/export.hpp, but that header uses nothing from namespace std. To me it looks like that #include is unnecessary, as all my code compiles fine if I remove that #include, but maybe I'm wrong. Was it included by mistake? PS: I'm using Boost 1.64, but I see the same #include in Boost 1.68

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Questions about Boost multiprecision library.
by A Z 11 Oct '18

11 Oct '18

I have some basic startup for use questions pertaining to the Boost multiprecision library. I have downloaded the set of 64 bit .dll files successfully online, and would like some help points to help me get going. *I have heard that there are some strange results that can happen if you are quizzing multiprecision for trigonometry and try to keep using the double type. Is this true, so that I can just kee relying on the std library instead? -What is the name of the 64 bit windows .dll, or .dll files, that are the ones for the multiprecision library? -If I wish to go into arbitrary precision and scale numbers, what is the type I should use for an integer? What is the #include statement I should use, and how do I specify the number of whole number points and decimal points, before starting my operations? -If I wish to go into arbitrary precision and scale numbers, what is the type I should use for a rational number? What is the #include statement I should use, and how do I specify the number of whole number points and decimal points, before starting my operations? -For these two types, I wish to do sine, cosine, tangent, arcsine, arccosine, arctangent, base 10 logarithm, base e logarithm, power, nth root. I also want to obtain pi, but also Euler's constant, to any number of significang figure or decimal places that I would like. -If the files are separate for the function support or not, what are the 64 bit .dll files for this? What #include statements should I use?

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signals2
by tim＠raisedbar.net 04 Oct '18

04 Oct '18

Hi, A friend pointed me at this library, as it may solve a problem for me. Am I correct in thinking that a signal can be activated once all of its slots are filled and not before? Best wishes. Tim Burgess Raised Bar Ltd. E: <mailto:tim@raisedbar.net> tim(a)raisedbar.net M: +44 (0)7989 486976

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Twenty years and time to retire
by Beman Dawes 04 Oct '18

04 Oct '18

The idea behind Boost was hatched in March, 1998, and the proposal document <https://www.boost.org/users/proposal.pdf> was released May 6, 1998. That makes Boost twenty years old, and makes me twenty years older. It is high time I retire from Boost; I haven't been able to contribute for some time now. Thanks to all of you who made Boost such an overwhelming success in the past and will drive Boost forward into a bright future! --Beman

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Making interprocess::message_queue use Windows_shared_memory instead of shared_memory_object
by Gaurav Sehgal 04 Oct '18

04 Oct '18

Hi, I am trying to make boost::interprocess::message_queue to use windows_shared_memory, instead of shared_memory_object. I have made the below changes to boost version 1.65.1 1) In ipc\message_queue.hpp, included windows_shared_memory.hpp instead of shared_memory_object.hpp 2) Changed typedef ipcdetail::managed_open_or_create_impl<shared_memory_object, 0, true, false> open_create_impl_t; to typedef ipcdetail::managed_open_or_create_impl<windows_shared_memory, 0, false, false> open_create_impl_t; 3) Changed the below in mq_hdr_t:: typedef ipcdetail::managed_open_or_create_impl<shared_memory_object, 0, true, false> open_create_impl_t; to typedef ipcdetail::managed_open_or_create_impl<windows_shared_memory, 0, false, false> open_create_impl_t; 4) Changed inline bool message_queue_t<VoidPointer>::remove(const char *name) { return shared_memory_object::remove(name); } to inline bool message_queue_t<VoidPointer>::remove(const char *name) { return true; } 5)Changed the below in detail\managed_open_or_create_impl.hpp template<bool dummy> static void truncate_device(DeviceAbstraction &dev, offset_t size, true_) { dev.truncate(size); } to template<bool dummy> static void truncate_device(DeviceAbstraction &dev, offset_t size, true_) { } After the above changes, no file is getting created and everything seems to work. Is there something else i should care about? Regards, Gaurav.

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undefined reference to `boost::log::v2_mt_posix::...
by Antonis Polykratis 01 Oct '18

01 Oct '18

Hello I face this error and I cannot figure out a fix. I use bjam to build the application code, and inside site-config file, I have also the following a section where I define BOOST_ALL_DYN_LINK: ''' using gcc : : : where I have defined <define> BOOST_ALL_DYN_LINK ''' I have build boost libraries with the following command: sudo bjam toolset=gcc --with-system --with-thread --with-timer --with-chrono --with-filesystem --with-program_options --with-timer *--with-log* --with-program_options --with-date_time --with-math --with-serialization --with-regex --with-chrono --with-atomic runtime-link=shared define=*BOOST_ALL_DYN_LINK* --prefix=/opt/boost_shared install | tee output.txt I also changed some files (macro definitions and jam files) because I had an error that system and filesystem are configured to be compiled both as static and shared. I compiled them as shared. When I build the application code, I have plenty of `boost::log::v2_mt_posix::...` error messages. Could you give me some guide why this problem exist? Thanks, Antonis

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error: ‘class boost::mutex’ has no member named ‘try_lock_for’
by Antonis Polykratis 28 Sep '18

28 Sep '18

Hi, I face this error, in linux, does this indicates that I have not build the library correctly? the error is in that line: boost/thread/lock_types.hpp:162:45 #ifdef BOOST_THREAD_USES_CHRONO template <class Clock, class Duration> unique_lock(Mutex& mtx, const chrono::time_point<Clock, Duration>& t) : m(&mtx), is_locked(mtx.try_lock_until(t)) { } template <class Rep, class Period> unique_lock(Mutex& mtx, const chrono::duration<Rep, Period>& d) : m(&mtx), is_locked(mtx.try_lock_for(d)) <--- here is the error { } #endif Thanks, Antonis

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Boost.Units Example: Convert between nautical mile and imperial foot
by Carel Combrink 27 Sep '18

27 Sep '18

Hi, I am trying to use Boost.Units to convert between different units. I have implemented the example code for the "Radar Beam Height" [1] section but trying to convert between nautical mile and imperial foot result in a compiler error: I have: typedef boost::units::quantity<boost::units::si::length> Meters; typedef boost::units::quantity<imperial::length> Feet; typedef boost::units::quantity<nautical::length> NMiles; double func() { // Working const Meters si1(300.0*nautical::miles); const Meters si2(300.0*imperial::feet); const Feet feet1(300.0*imperial::feet); const Feet feet2(300.0*boost::units::si::meters); const NMiles mile1(300.0*nautical::miles); const NMiles mile2(300.0*boost::units::si::meters); // BROKEN const Feet feet3(300.0*nautical::miles); const NMiles mile3(300.0*imperial::feet); } The first few works, converting between meters and the new units, but converting between the two does not work. To see the issue see the code on Compiler Explorer here: https://gcc.godbolt.org/z/MpvuMy How can I get this working? [1] https://www.boost.org/doc/libs/1_68_0/doc/html/boost_units/Examples.html#bo… Regards,

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Serialization with BOOST _CLASS_EXPORT_KEY() is not the same as registert_type<>()
by Kosby, Ray B. (GSFC-428.0)[COLUMBUS TECHNOLOGIES AND SERVICES INC] 25 Sep '18

25 Sep '18

Hi, I’m trying to serialize a derived object with polymorphism into a file and deserialize to a base class pointer. This works when I use the register_type function but not the BOOST_CLASS_EXPORT_KEY() and BOOST_CLASS_IMPLEMENT() macros. I need to use the macros since I am using shared libraries. Here is a sample of code to demonstrate the problem. When run it gets a unregistered class exception. I’m using RHEL 7.4 with Boost 1.53. cat testera.h #ifndef testera_h #define testera_h #include <boost/serialization/serialization.hpp> #include <boost/archive/polymorphic_oarchive.hpp> #include <boost/archive/polymorphic_iarchive.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/string.hpp> class A { private: friend class boost::serialization::access; template< class Arch > void serialize( Arch &ar, const unsigned int ver ); public: A(); virtual ~A() {} void setStr( const std::string &s ); std::string getStr(); protected: std::string myStr; }; BOOST_CLASS_EXPORT_KEY(A) #endif boost_ptr> cat testera.C #include "testera.h" BOOST_CLASS_EXPORT_IMPLEMENT(A) template void A::serialize<boost::archive::polymorphic_oarchive>( boost::archive::polymorphic_oarchive &ar, const unsigned int ver ); template void A::serialize<boost::archive::polymorphic_iarchive>( boost::archive::polymorphic_iarchive &ar, const unsigned int ver ); A::A() : myStr( "a" ) { } void A::setStr( const std::string &s ) { myStr = s; } std::string A::getStr() { return myStr; } template<class Arch> void A::serialize( Arch &ar, const unsigned int ver ) { ar & myStr; } boost_ptr> cat testerb.h #ifndef testerb_h #define testerb_h #include "testera.h" class B : public A { private: friend class boost::serialization::access; template< class Arch > void serialize( Arch &ar, const unsigned int ver ); public: B(); virtual ~B() {} void set( const int i ); int get(); protected: int myI; }; BOOST_CLASS_EXPORT_KEY(B) #endif boost_ptr> cat testerb.C #include "testerb.h" BOOST_CLASS_EXPORT_IMPLEMENT(B) template void B::serialize<boost::archive::polymorphic_oarchive>( boost::archive::polymorphic_oarchive &ar, const unsigned int ver ); template void B::serialize<boost::archive::polymorphic_iarchive>( boost::archive::polymorphic_iarchive &ar, const unsigned int ver ); B::B(): myI( 1 ) { myStr = "b"; } void B::set( const int i ) { myI = i; } int B::get() { return myI; } template< class Arch > void B::serialize( Arch &ar, const unsigned int ver ) { // boost::serialization::void_cast_register< B, A >( static_cast< B *>( NULL ), static_cast< A * >( NULL ) ); ar & boost::serialization::base_object<A>( *this ); ar & myI; } int main( int argc, char *argv[] ) { int ret = 0; B obj; B obj2; obj.set( 2 ); A *ptr = NULL; B *bptr = NULL; bptr = &obj; ptr = &obj; if( argc > 1 ) { std::string fl = argv[ 1 ]; { std::ofstream ofl( fl.c_str() ); boost::archive::polymorphic_text_oarchive toar( ofl ); boost::archive::polymorphic_oarchive *oar = &toar; /* oar->register_type(static_cast<A *>(NULL)); oar->register_type(static_cast<B *>(NULL)); */ try { *oar & obj; // *oar & ptr; } catch( std::exception &e ) { std::cerr << "Error: archive from B to file " << fl << " - " << e.what() << std::endl; ret = 1; } } if( ! ret ) { ptr = NULL; bptr = NULL; { std::ifstream ifl( fl.c_str() ); boost::archive::polymorphic_text_iarchive tiar( ifl ); boost::archive::polymorphic_iarchive *iar = &tiar; /* iar->register_type(static_cast<A *>(NULL)); iar->register_type(static_cast<B *>(NULL)); */ try { *iar & ptr; // *iar & bptr; } catch( std::exception &e ) { std::cerr << "Error: archive from file " << fl << " to B * - " << e.what() << std::endl; ret = 1; } } if( ! ret ) { // std::cout << bptr->get() << std::endl; std::cout << static_cast<B*>( ptr )->get() << std::endl; } } } return ret; } testera and testerb are compiled into a shared library with this: boost_ptr> cat Makefile_lib CXXFLAGS = -c -ggdb3 -fPIC -funswitch-loops -fgcse-after-reload -std=c++11 LDFLAGS = -std=c++11 -lboost_serialization -lboost_thread -lboost_system -lboost_filesystem OBJLOC = obj OBJS = $(OBJLOC)/testera.o \ $(OBJLOC)/testerb.o LIBRARY_NAME = libtester.so libs:$(LIBRARY_NAME) $(LIBRARY_NAME): $(OBJS) ${CXX} -shared -o $@ $(OBJS) $(OBJLOC)/%.o: ./%.C $(CXX) $(CXXFLAGS) ./$*.C -o $(OBJLOC)/$*.o tester_mn is compiled into the executable with this: boost_ptr> cat Makefile_mn CXXFLAGS = -ggdb3 -funswitch-loops -fgcse-after-reload -std=c++11 LDFLAGS = -lboost_serialization -lboost_thread -lboost_system -lboost_filesystem -L. -ltester tester_mn: tester_mn.o ${CXX} $(CXXFLAGS) $(LDFLAGS) tester_mn.C -o $@ If I were to comment out the BOOST macros and uncomment the register_type() functions from tester_mn.C everything works. Is there a way to get the macros to work? -- Ray Kosby Software Engineer Columbus Technologies and Services, Inc www.columbususa.com<http://www.columbususa.com> Office - (301) 286-5095, fax - (301) 286-7475 NASA Goddard Space Flight Center, MS 452.1 Bldg 13 Rm 141 8800 Greenbelt Rd Greenbelt, MD 20771 USA

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