- i -

• insert() : simple_heap_x
• is_active() : player_x
• is_allowed_step() : way_planner_x
• is_attraction() : building_desc_x
• is_available() : obj_desc_time_x
• is_bridge() : tile_x
• is_choose_sign() : sign_desc_x
• is_connected() : halt_x , powerline_x
• is_coord_valid() : world
• is_coupling_allowed() : vehicle_desc_x
• is_crossing() : way_x
• is_curve() : dir
• is_deletable() : field_x
• is_electricity_producer() : factory_desc_x
• is_electrified() : way_x
• is_empty() : simple_heap_x , tile_x
• is_end_choose_signal() : sign_desc_x
• is_equal() : obj_desc_x
• is_future() : obj_desc_time_x
• is_ground() : tile_x
• is_headquarter() : building_x
• is_in_depot() : convoy_x
• is_interchangeable() : good_desc_x
• is_loading() : convoy_x
• is_longblock_signal() : sign_desc_x
• is_marked() : map_object_x , tile_x
• is_monument() : building_x
• is_one_way() : sign_desc_x
• is_overhead_line() : wayobj_desc_x
• is_paused() : debug
• is_pre_signal() : sign_desc_x
• is_priority_signal() : sign_desc_x
• is_private_way() : sign_desc_x
• is_removable() : map_object_x
• is_retired() : obj_desc_time_x
• is_same_building() : building_x
• is_schedule_editor_open() : convoy_x
• is_signal() : sign_desc_x
• is_single() : dir
• is_straight() : dir
• is_terminus() : building_desc_x
• is_threeway() : dir
• is_townhall() : building_x
• is_traffic_light() : sign_desc_x
• is_transformer_connected() : factory_x
• is_tunnel() : tile_x
• is_twoway() : dir
• is_valid() : city_x , convoy_x , factory_x , halt_x , ingame_object , line_x , map_object_x , obj_desc_x , player_x , square_x , tile_x
• is_waiting() : convoy_x
• is_water() : tile_x
• is_withdrawn() : convoy_x