For a short while now I've been using boost serialization. It works perfectly... except... it keeps coming up one massive warning (that takes up ~100 lines). (see below) Whenever I get annoyed, I try to experiment and then search for answers online, but no luck. I'm probably using the library incorrectly somewhere. So I made a small program that generates the problem. Any advice on what I could be doing wrong would be appreciated. I use vc++ 2008 btw. Thanks. Code: -------------------------------------------- /* demonstration of problem. The program asks the user for a number, and then saves this number to a file. When the user returns, the number is remembered. */ #include <iostream> #include <fstream> #include #include #include // save and load methods void save (const char * fname); bool load (const char * fname); // returns if successful // I know this is way too simple to put in a class, but bare with me class Game { public: Game () { number = 0; } void getNumberFromUser () { std::cin >> number; } int getNumber () { return number; } private: int number; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & number; } }; typedef boost::shared_ptr< Game > Game_ptr; Game_ptr game; // entry int main () { game = Game_ptr( new Game ); // welcome std::cout << "Hello\n"; // if file exists, recall the number if (load ("save.txt")) std::cout << "You're number is " << game->getNumber() << ".\n"; // ask user for number std::cout << "Enter a number: \n"; game->getNumberFromUser (); // memorise number save ("save.txt"); // exit return 0; } void save (const char * fname) { std::ofstream ofs( fname ); boost::archive::text_oarchive oa( ofs ); // save oa << game; } bool load (const char * fname) { std::ifstream ifs( fname ); if (!ifs) return false; // file doesn't already exist boost::archive::text_iarchive ia( ifs ); // load ia >> game; // <------ Removing this line makes the warning go away return true; } Warning: -------------------------------------------- 1>main.cpp 1>d:\dev\boostpro\boost\boost_1_40\boost\serialization\extended_type_info_typeid.hpp(88) : warning C4099: 'boost::serialization::static_warning_impl<false>::STATIC_WARNING' : type name first seen using 'struct' now seen using 'class' 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\static_warning.hpp(115) : see declaration of 'boost::serialization::static_warning_impl<false>::STATIC_WARNING' 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\extended_type_info_typeid.hpp(85) : while compiling class template member function 'const boost::serialization::extended_type_info *boost::serialization::extended_type_info_typeid<T>::get_derived_extended_type_info(const T &) const' 1> with 1> [ 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\shared_ptr_helper.hpp(105) : see reference to class template instantiation 'boost::serialization::extended_type_info_typeid<T>' being compiled 1> with 1> [ 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\shared_ptr.hpp(138) : see reference to function template instantiation 'void boost::archive::detail::shared_ptr_helper::reset<Game>(boost::shared_ptr<T> &,T *)' being compiled 1> with 1> [ 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\split_free.hpp(58) : see reference to function template instantiation 'void boost::serialization::load(Archive &,boost::shared_ptr<T> &,const unsigned int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\split_free.hpp(54) : while compiling class template member function 'void boost::serialization::free_loader::invoke(Archive &,T &,const unsigned int)' 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=boost::shared_ptr<Game> 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\split_free.hpp(74) : see reference to class template instantiation 'boost::serialization::free_loader' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=boost::shared_ptr<Game> 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\shared_ptr.hpp(153) : see reference to function template instantiation 'void boost::serialization::split_free(Archive &,boost::shared_ptr<T> &,const unsigned int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\serialization\serialization.hpp(133) : see reference to function template instantiation 'void boost::serialization::serialize(Archive &,boost::shared_ptr<T> &,const unsigned int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(174) : see reference to function template instantiation 'void boost::serialization::serialize_adl(Archive &,T &,const unsigned int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(161) : while compiling class template member function 'void boost::archive::detail::iserializer::load_object_data(boost::archive::detail::basic_iarchive &,void *,const unsigned int) const' 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(362) : see reference to class template instantiation 'boost::archive::detail::iserializer' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(351) : while compiling class template member function 'void boost::archive::detail::load_non_pointer_type::load_standard::invoke(Archive &,T &)' 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(417) : see reference to class template instantiation 'boost::archive::detail::load_non_pointer_type::load_standard' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(405) : while compiling class template member function 'void boost::archive::detail::load_non_pointer_type::invoke(Archive &,T &)' 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\iserializer.hpp(542) : see reference to class template instantiation 'boost::archive::detail::load_non_pointer_type' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\common_iarchive.hpp(61) : see reference to function template instantiation 'void boost::archive::load(Archive &,T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\basic_text_iarchive.hpp(62) : see reference to function template instantiation 'void boost::archive::detail::common_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\text_iarchive.hpp(66) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\boostpro\boost\boost_1_40\boost\archive\detail\interface_iarchive.hpp(61) : see reference to function template instantiation 'void boost::archive::text_iarchive_impl<Archive>::load_override<T>(T &,int)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ] 1> d:\dev\visual studio 2008\projects\boostserialisation\boostserialisation\main.cpp(82) : see reference to function template instantiation 'Archive &boost::archive::detail::interface_iarchive<Archive>::operator >>(T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_iarchive, 1> T=Game_ptr 1> ]