public: bool __cdecl std::basic_filebuf<char, struct std::char_traits<char> >::is_open(void)const __ptr64

Mangled name

?is_open@?$basic_filebuf@DU?$char_traits@D@std@@@std@@QEBA_NXZ

Exported by

size	filename	version
853312	msvcp90.dll	9.00.30729.4148