Error	14	error LNK2019: unresolved external symbol "__declspec(dllimport) private: __thiscall std::basic_istream<char,struct std::char_traits<char> >::basic_istream<char,struct std::char_traits<char> >(class std::basic_istream<char,struct std::char_traits<char> > const &)" (__imp_??0?$basic_istream@DU?$char_traits@D@std@@@std@@AAE@ABV01@@Z) referenced in function "protected: void __thiscall boost::optional_detail::optional_base<class std::basic_istream<char,struct std::char_traits<char> > >::construct<class std::basic_ifstream<char,struct std::char_traits<char> > >(class std::basic_ifstream<char,struct std::char_traits<char> > const &,void const *)" (??$construct@V?$basic_ifstream@DU?$char_traits@D@std@@@std@@@?$optional_base@V?$basic_istream@DU?$char_traits@D@std@@@std@@@optional_detail@boost@@IAEXABV?$basic_ifstream@DU?$char_traits@D@std@@@std@@PBX@Z)