public static extern System.IntPtr grn_obj_get_element_info(ref grn_ctx ctx, ref grn_table_cursor obj, uint id, grn_info_type type, ref grn_table_cursor value) ;
public static extern grn_rc grn_obj_set_element_info(ref grn_ctx ctx, ref grn_table_cursor obj, uint id, grn_info_type type, ref grn_table_cursor value) ;
public static extern System.IntPtr grn_obj_get_info(ref grn_ctx ctx, ref grn_table_cursor obj, grn_info_type type, ref grn_table_cursor valuebuf) ;