Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

### - o -

- o : ResolverObject
- obj_len : SaveLoadParams
- Object() : Object
- object_height : BuildObjectWindow
- OBJECT_MARGIN : BuildObjectWindow
- ObjectToBool() : Squirrel
- ObjectToInteger() : Squirrel
- ObjectToString() : Squirrel
- occupied : RoadStop::Entry
- ocean_speed_frac : ShipVehicleInfo
- offs : TileHighlightData
- offset : LoggedChange , NIProperty , NICallback , UnmappedChoiceList , OldChunks , StringParameters , Blitter_32bppOptimized::SpriteData , Blitter_8bppOptimized::SpriteData , BmpInfo , CompanyManagerFaceBitsInfo
- offsets : LanguagePackHeader
- oil_refinery : ExtraPaletteValues
- oil_refinery_limit : GameCreationSettings
- ok_btn : OskWindow
- okay : PBSTileInfo
- old : Vehicle
- old_act : TransportedCargoStat< Tstorage >
- old_d : UnmappedChoiceList
- old_economy : CompanyProperties
- old_max : TransportedCargoStat< Tstorage >
- old_max_loan_unround : Economy
- old_max_loan_unround_fract : Economy
- old_refittable : ShipVehicleInfo
- old_tile : GetNewVehiclePosResult
- oldval : LoggedChange
- OnboardCount() : VehicleCargoList
- OnCleanPool() : CargoList< Tinst, Tcont > , VehicleCargoList
- OnClick() : GraphLegendWindow , BaseGraphWindow , PerformanceHistoryGraphWindow , PaymentRatesGraphWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , EndGameHighScoreBaseWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , SelectGameWindow , LinkGraphLegendWindow , QueryWindow , MusicTrackSelectionWindow , MusicWindow , AIListWindow , NetworkLobbyWindow , NetworkClientListWindow , AISettingsWindow , NetworkJoinStatusWindow , SpriteAlignerWindow , AIConfigWindow , NewGRFParametersWindow , NewsWindow , BuildAirToolbarWindow , MessageHistoryWindow , MessageOptionsWindow , BuildAirportWindow , BuildObjectWindow , OrdersWindow , ReplaceVehicleWindow , OskWindow , BuildRailToolbarWindow , BuildBridgeWindow , BuildRailStationWindow , BuildSignalWindow , BuildVehicleWindow , BuildRailDepotWindow , BuildRailWaypointWindow , CheatWindow , BuildRoadToolbarWindow , BuildRoadDepotWindow , CompanyFinancesWindow , BuildRoadStationWindow , GameOptionsWindow , SelectCompanyLiveryWindow , GameDifficultyWindow , GameSettingsWindow , SelectCompanyManagerFaceWindow , CustomCurrencyWindow , SmallMapWindow , CompanyWindow , CompanyStationsWindow , StationViewWindow , BuyCompanyWindow , SelectStationWindow< T > , StatusBarWindow , SetDateWindow , SubsidyListWindow , TerraformToolbarWindow , DepotWindow , ScenarioEditorLandscapeGenerationWindow , TimetableWindow , BuildDocksToolbarWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , BuildDocksStationWindow , TownAuthorityWindow , TownViewWindow , BuildDocksDepotWindow , TownDirectoryWindow , TransparenciesWindow , EnginePreviewWindow , BuildTreesWindow , RefitWindow , CreateScenarioWindow , VehicleListWindow , VehicleDetailsWindow , GenerateProgressWindow , VehicleViewWindow , ExtraViewportWindow , GoalListWindow , WaypointWindow , DropdownWindow , GoalQuestionWindow , Window
- OnConnect() : ConsoleContentCallback , TCPConnecter , NetworkHTTPContentConnecter , TCPQueryConnecter , TCPClientConnecter , NetworkContentConnecter , ContentCallback , NetworkContentListWindow , BootstrapAskForDownloadWindow
- OnCTRLStateChange() : DepotWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , Window
- OnDisconnect() : ConsoleContentCallback , ContentCallback
- OnDownloadComplete() : BootstrapContentDownloadStatusWindow , ConsoleContentCallback , ContentCallback , NetworkContentListWindow
- OnDownloadProgress() : ContentCallback , NetworkContentDownloadStatusWindow , BaseNetworkContentDownloadStatusWindow
- OnDragDrop() : DepotWindow , VehicleGroupWindow , OrdersWindow , RefitWindow , Window
- OnDropdownSelect() : BuildAirportWindow , ReplaceVehicleWindow , BuildBridgeWindow , BuildVehicleWindow , SelectCompanyLiveryWindow , SetDateWindow , CreateScenarioWindow , VehicleGroupWindow , IndustryDirectoryWindow , MessageOptionsWindow , OrdersWindow , GameOptionsWindow , CompanyStationsWindow , StationViewWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , VehicleListWindow , Window
- OneTileCost() : CYapfCostRailT< Types > , CYapfCostRoadT< Types >
- OnFailure() : TCPConnecter , HTTPCallback , NetworkHTTPContentConnecter , TCPQueryConnecter , TCPClientConnecter , NetworkContentConnecter , ClientNetworkContentSocketHandler
- OnFocus() : Window
- OnFocusLost() : Window
- OnHover() : IndustryCargoesWindow , Window
- OnHundredthTick() : CompanyFinancesWindow , CompanyWindow , IConsoleWindow , PaymentRatesGraphWindow , IndustryDirectoryWindow , TownAuthorityWindow , TownDirectoryWindow , Window
- OnInit() : BuildVehicleWindow , SelectCompanyManagerFaceWindow , PaymentRatesGraphWindow , BuildIndustryWindow , IndustryCargoesWindow , SelectGameWindow , LandInfoWindow , MessageOptionsWindow , SmallMapWindow , TerraformToolbarWindow , BuildTreesWindow , RefitWindow , Window
- OnInitialPosition() : BuildBridgeWindow , SetDateWindow , TooltipsWindow , NetworkClientListPopupWindow , NewsWindow , StatusBarWindow , TerraformToolbarWindow , TransparenciesWindow , DropdownWindow , Window
- OnInvalidateData() : OskWindow , BuildSignalWindow , BuildRoadToolbarWindow , GameOptionsWindow , GameDifficultyWindow , SignListWindow , SmallMapWindow , CompanyStationsWindow , StationViewWindow , SelectStationWindow< T > , StatusBarWindow , SubsidyListWindow , TimetableWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , TownViewWindow , TownDirectoryWindow , FoundTownWindow , TransparenciesWindow , RefitWindow , VehicleListWindow , VehicleDetailsWindow , VehicleViewWindow , ExtraViewportWindow , WaypointWindow , Window , AIListWindow , AISettingsWindow , AIConfigWindow , AIDebugWindow , ReplaceVehicleWindow , BuildVehicleWindow , SelectCompanyLiveryWindow , CompanyInfrastructureWindow , DepotWindow , BuildDocksToolbarWindow , ErrmsgWindow , SaveLoadWindow , GenerateLandscapeWindow , GoalListWindow , GraphLegendWindow , BaseGraphWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , SelectGameWindow , LinkGraphLegendWindow , MainWindow , LandInfoWindow , MusicTrackSelectionWindow , MusicWindow , NetworkChatWindow , NetworkContentListWindow , NetworkGameWindow , SpriteAlignerWindow , NewGRFParametersWindow , NewGRFWindow , NewsWindow , MessageHistoryWindow , MessageOptionsWindow , OrdersWindow
- OnKeyPress() : BuildAirToolbarWindow , BuildBridgeWindow , IConsoleWindow , BuildDocksToolbarWindow , EndGameHighScoreBaseWindow , MainWindow , QueryWindow , NewsWindow , OrdersWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , Window
- online : NetworkGameList
- OnMouseDrag() : DepotWindow , OrdersWindow , RefitWindow , Window
- OnMouseLoop() : IConsoleWindow , TooltipsWindow , NetworkClientListPopupWindow , OskWindow , DropdownWindow , Window
- OnMouseOver() : NetworkClientListWindow , Window
- OnMouseWheel() : IConsoleWindow , MainWindow , SmallMapWindow , ExtraViewportWindow , Window
- OnNewDay() : Aircraft , RoadVehicle , Ship , Train , Vehicle
- OnNewGRFsScanned() : NewGRFScanCallback , NewGRFWindow , AfterNewGRFScan
- OnOpenOSKWindow() : QueryStringWindow , NetworkChatWindow , NetworkCompanyPasswordWindow , QueryStringBaseWindow
- OnOSKInput() : QueryStringBaseWindow
- OnPaint() : VehicleListWindow , TimetableWindow , TownDirectoryWindow , BuildAirportWindow , OrdersWindow , ReplaceVehicleWindow , BuildVehicleWindow , CompanyFinancesWindow , MainWindow , SelectCompanyLiveryWindow , SelectCompanyManagerFaceWindow , CompanyWindow , EndGameWindow , IConsoleWindow , DepotWindow , BuildDocksStationWindow , BuildDocksDepotWindow , CreateScenarioWindow , CompanyLeagueWindow , VehicleGroupWindow , HighScoreWindow , IndustryViewWindow , IndustryDirectoryWindow , NetworkLobbyWindow , NetworkClientListWindow , MessageHistoryWindow , OskWindow , BuildRailStationWindow , BuildRoadStationWindow , SmallMapWindow , CompanyStationsWindow , StationViewWindow , ScenarioEditorLandscapeGenerationWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , TownAuthorityWindow , TransparenciesWindow , BuildTreesWindow , RefitWindow , VehicleDetailsWindow , VehicleViewWindow , Window
- OnPlaceDrag() : TerraformToolbarWindow , BuildAirToolbarWindow , BuildDocksToolbarWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , ScenarioEditorLandscapeGenerationWindow , BuildTreesWindow , Window
- OnPlaceMouseUp() : TerraformToolbarWindow , BuildAirToolbarWindow , BuildDocksToolbarWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , ScenarioEditorLandscapeGenerationWindow , BuildTreesWindow , Window
- OnPlaceObject() : Window , ScenarioEditorLandscapeGenerationWindow , OrdersWindow , BuildAirToolbarWindow , CompanyWindow , BuildDocksToolbarWindow , BuildIndustryWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , BuildTreesWindow
- OnPlaceObjectAbort() : BuildAirToolbarWindow , CompanyWindow , DepotWindow , BuildDocksToolbarWindow , VehicleGroupWindow , BuildIndustryWindow , OrdersWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , Window , BuildTreesWindow , BuildRailToolbarWindow
- OnPlacePresize() : BuildDocksToolbarWindow , BuildRailToolbarWindow , Window , BuildRoadToolbarWindow
- OnQueryTextFinished() : AISettingsWindow , BuildVehicleWindow , CheatWindow , SelectCompanyManagerFaceWindow , CompanyWindow , DepotWindow , VehicleGroupWindow , IndustryViewWindow , NetworkJoinStatusWindow , NewGRFParametersWindow , OrdersWindow , GameSettingsWindow , StationViewWindow , TimetableWindow , ScenarioEditorToolbarWindow , TownViewWindow , VehicleDetailsWindow , WaypointWindow , Window , CustomCurrencyWindow , SpriteAlignerWindow , CreateScenarioWindow
- OnReceiveContentInfo() : BootstrapAskForDownloadWindow , ContentCallback , NetworkContentListWindow
- OnReceiveData() : ClientNetworkContentSocketHandler , HTTPCallback
- OnResize() : SelectStationWindow< T > , NetworkLobbyWindow , OrdersWindow , BuildRailStationWindow , BuildObjectWindow , NewGRFParametersWindow , IndustryCargoesWindow , VehicleGroupWindow , ReplaceVehicleWindow , BuildBridgeWindow , AISettingsWindow , SpriteAlignerWindow , WaypointWindow , IndustryDirectoryWindow , IndustryViewWindow , TownViewWindow , VehicleListWindow , TimetableWindow , AIListWindow , Window , TownDirectoryWindow , BuildVehicleWindow , DepotWindow , GoalListWindow , BuildIndustryWindow , VehicleViewWindow , MainWindow , MessageHistoryWindow , GameSettingsWindow , CompanyStationsWindow , StationViewWindow , SubsidyListWindow , RefitWindow , VehicleDetailsWindow , ExtraViewportWindow
- OnRightClick() : DepotWindow , SmallMapWindow , Window
- OnScroll() : Window , MainWindow , ExtraViewportWindow , SmallMapWindow
- OnTick() : VehicleGroupWindow , NewsWindow , CompanyLeagueWindow , BuildRailStationWindow , VehicleListWindow , SelectStationWindow< T > , CompanyStationsWindow , BuildIndustryWindow , Window , DropdownWindow , MainWindow , MainToolbarWindow , SmallMapWindow , BaseGraphWindow , AISettingsWindow , PaymentRatesGraphWindow , BuildDocksStationWindow , PerformanceRatingDetailWindow , BuildAirportWindow , AboutWindow , NewGRFParametersWindow , BuildRoadStationWindow , StatusBarWindow , ScenarioEditorToolbarWindow , VehicleViewWindow
- OnTimeout() : DepotWindow , CreateScenarioWindow , OrdersWindow , TerraformToolbarWindow , MainToolbarWindow , BuildTreesWindow , Window , CheatWindow , ScenarioEditorLandscapeGenerationWindow , IndustryViewWindow , ScenarioEditorToolbarWindow , CompanyStationsWindow , CustomCurrencyWindow , BuildIndustryWindow , GameSettingsWindow
- OnVehicleSelect() : Window , DepotWindow
- OpenCount() : CNodeList_HashTableT< Titem_, Thash_bits_open_, Thash_bits_closed_ >
- OpenFile() : IniLoadFile , SettingsIniFile , IniFile
- openlist_hash : AyStar
- openlist_queue : AyStar
- OpenListAdd() : AyStar
- OpenListIsInList() : AyStar
- OpenListPop() : AyStar
- openttd_id : LanguageMap::Mapping
- operator const T &() : AdaptT< T >
- operator const T *() : AutoFreePtr< T >
- operator const Tcls *() : CCountedPtr< Tcls_ >
- operator delete() : Window , ZeroedMemoryAllocator , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool > , GRFText
- operator delete[]() : ZeroedMemoryAllocator
- operator enum_type() : SimpleTinyEnumT< enum_type, storage_type > , TinyEnumT< Tenum_t >
- operator new() : ZeroedMemoryAllocator , GRFText , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool > , GRFText , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool >
- operator new[]() : Window , ZeroedMemoryAllocator
- operator T &() : AdaptT< T >
- operator T *() : SmallStackSafeStackAlloc< T, length > , AutoFreePtr< T >
- operator Tcls *() : CCountedPtr< Tcls_ >
- operator TileIndex() : TileIterator
- operator!=() : CargoSummaryItem , NetworkAddress , RefitOption
- operator&() : CCountedPtr< Tcls_ >
- operator&=() : SimpleTinyEnumT< enum_type, storage_type >
- operator()() : DistanceAnnotation::Comparator , StringCompare , CapacityAnnotation::Comparator , StringCompare
- operator*() : MultiMapIterator< Tmap_iter, Tlist_iter, Tkey, Tvalue, Tcompare >
- operator*=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator++() : MultiMapIterator< Tmap_iter, Tlist_iter, Tkey, Tvalue, Tcompare > , AirportTileTableIterator , TinyEnumT< Tenum_t > , DiagonalTileIterator , OrthogonalTileIterator , AirportTileIterator , TileIterator , TinyEnumT< Tenum_t >
- operator+=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator--() : MultiMapIterator< Tmap_iter, Tlist_iter, Tkey, Tvalue, Tcompare >
- operator->() : CCountedPtr< Tcls_ > , SmallStackSafeStackAlloc< T, length > , AutoFreePtr< T > , MultiMapIterator< Tmap_iter, Tlist_iter, Tkey, Tvalue, Tcompare > , AutoFreePtr< T >
- operator<() : NetworkAddress , CStrA
- operator=() : TinyEnumT< Tenum_t > , SimpleTinyEnumT< enum_type, storage_type > , MultiMapIterator< Tmap_iter, Tlist_iter, Tkey, Tvalue, Tcompare > , AdaptT< T > , CStrA , SimpleTinyEnumT< enum_type, storage_type > , SmallVector< T, S > , CCountedPtr< Tcls_ > , CStrA
- operator==() : NetworkAddress , RefitOption , NetworkAddress
- operator[]() : SmallMap< T, U, S > , SmallArray< T, B, N > , CargoArray , TileMatrix< T, N > , FixedSizeArray< T, C > , CargoArray , FixedSizeArray< T, C > , SmallVector< T, S >
- operator|=() : SimpleTinyEnumT< enum_type, storage_type >
- opf : PathfinderSettings
- opt : GetOptData
- options : GetOptData
- order : RefitWindow , GameSettings
- Order() : Order
- order : Listing
- order_over : OrdersWindow
- order_review_system : GUISettings
- OrderBackup() : OrderBackup
- OrderClick_Conditional() : OrdersWindow
- OrderClick_Delete() : OrdersWindow
- OrderClick_FullLoad() : OrdersWindow
- OrderClick_Goto() : OrdersWindow
- OrderClick_NearestDepot() : OrdersWindow
- OrderClick_Nonstop() : OrdersWindow
- OrderClick_Refit() : OrdersWindow
- OrderClick_Service() : OrdersWindow
- OrderClick_Share() : OrdersWindow
- OrderClick_Skip() : OrdersWindow
- OrderClick_StopSharing() : OrdersWindow
- OrderClick_Unload() : OrdersWindow
- OrderGetSel() : OrdersWindow
- OrderHotkey_NoLoad() : OrdersWindow
- OrderHotkey_NoUnload() : OrdersWindow
- OrderHotkey_Transfer() : OrdersWindow
- orderindex : OrderBackup
- OrderList() : OrderList
- OrderPlaceObjectState : OrdersWindow
- orders : OrderBackup , Vehicle
- ordinal_width : CompanyLeagueWindow
- orientation : RailStationGUISettings
- orig_list : NewGRFWindow
- orig_str_buf : OskWindow
- origin : Path
- original_image_index : Engine
- original_md5sum : GRFConfig
- OrthogonalTileIterator() : OrthogonalTileIterator
- os2_bmp : BmpInfo
- other_accepted : CargoesField
- other_company_name : CompanyNewsInformation
- other_produced : CargoesField
- outersize : TileHighlightData
- outgoing_queue : ServerNetworkGameSocketHandler
- output_buffer : OutputStore
- OutputBufferVector : OutputStore
- overdrawn_ops : Squirrel
- Overflowed() : SmallSet< Tdir, items >
- override : GRFFileProps
- OverrideManagerBase() : OverrideManagerBase
- overtaking : RoadVehicle
- overtaking_ctr : RoadVehicle
- own_name : LanguagePackHeader
- owner : BaseStation , Group , CargoPayment , Industry , Window , TileDesc , Vehicle
- owner_type : TileDesc
- OwnerDeityFilter() : SignList
- OwnerVisibilityFilter() : SignList