Symbol public: class std::basic_string<unsigned short, struct std::char_traits<unsigned short>, class std::allocator<unsigned short> > & __cdecl std::basic_string<unsigned short, struct std::char_traits<unsigned short>, class std::allocator<unsigned short> >::append(class std::basic_string<unsigned short, struct std::char_traits<unsigned short>, class std::allocator<unsigned short> > const &, unsigned __int64, unsigned _