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 , FINAL::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
- OnCleanPool() : CargoList< Tinst >
- OnClick() : PerformanceHistoryGraphWindow , PaymentRatesGraphWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , EndGameHighScoreBaseWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , SelectGameWindow , QueryWindow , MusicTrackSelectionWindow , AIListWindow , MusicWindow , NetworkLobbyWindow , AISettingsWindow , NetworkClientListWindow , NetworkJoinStatusWindow , AIConfigWindow , SpriteAlignerWindow , NewGRFParametersWindow , BuildAirToolbarWindow , NewsWindow , MessageHistoryWindow , BuildAirportWindow , MessageOptionsWindow , BuildObjectWindow , ReplaceVehicleWindow , OrdersWindow , OskWindow , BuildBridgeWindow , BuildRailToolbarWindow , BuildRailStationWindow , BuildVehicleWindow , BuildSignalWindow , BuildRailDepotWindow , CheatWindow , BuildRailWaypointWindow , BuildRoadToolbarWindow , CompanyFinancesWindow , BuildRoadDepotWindow , BuildRoadStationWindow , SelectCompanyLiveryWindow , GameOptionsWindow , GameDifficultyWindow , SelectCompanyManagerFaceWindow , GameSettingsWindow , CustomCurrencyWindow , CompanyWindow , SmallMapWindow , CompanyStationsWindow , BuyCompanyWindow , StationViewWindow , SelectStationWindow< T > , SetDateWindow , StatusBarWindow , SubsidyListWindow , DepotWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , BuildDocksToolbarWindow , TimetableWindow , MainToolbarWindow , BuildDocksStationWindow , ScenarioEditorToolbarWindow , TownAuthorityWindow , BuildDocksDepotWindow , TownViewWindow , TownDirectoryWindow , EnginePreviewWindow , TransparenciesWindow , BuildTreesWindow , CreateScenarioWindow , RefitWindow , VehicleListWindow , GenerateProgressWindow , VehicleDetailsWindow , VehicleViewWindow , GoalListWindow , ExtraViewportWindow , WaypointWindow , GoalQuestionWindow , DropdownWindow , Window , GraphLegendWindow , BaseGraphWindow
- OnConnect() : TCPQueryConnecter , TCPClientConnecter , NetworkContentConnecter , ContentCallback , NetworkContentListWindow , BootstrapAskForDownloadWindow , ConsoleContentCallback , TCPConnecter , NetworkHTTPContentConnecter
- 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 , 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() : SignListWindow , SmallMapWindow , CompanyStationsWindow , 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 , MainWindow , LandInfoWindow , MusicTrackSelectionWindow , MusicWindow , NetworkChatWindow , NetworkContentListWindow , NetworkGameWindow , SpriteAlignerWindow , NewGRFParametersWindow , NewGRFWindow , NewsWindow , MessageHistoryWindow , MessageOptionsWindow , OrdersWindow , OskWindow , BuildSignalWindow , BuildRoadToolbarWindow , GameOptionsWindow , GameDifficultyWindow
- 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() : FINAL , Vehicle
- OnNewGRFsScanned() : NewGRFScanCallback , NewGRFWindow , AfterNewGRFScan
- OnOpenOSKWindow() : QueryStringWindow , NetworkChatWindow , NetworkCompanyPasswordWindow , QueryStringBaseWindow
- OnOSKInput() : QueryStringBaseWindow
- OnPaint() : BuildRailStationWindow , VehicleViewWindow , BuildTreesWindow , StationViewWindow , NetworkClientListWindow , BuildAirportWindow , CompanyLeagueWindow , ReplaceVehicleWindow , BuildVehicleWindow , CompanyFinancesWindow , SelectCompanyLiveryWindow , SelectCompanyManagerFaceWindow , CompanyWindow , IConsoleWindow , DepotWindow , BuildDocksStationWindow , BuildDocksDepotWindow , CreateScenarioWindow , VehicleGroupWindow , EndGameWindow , HighScoreWindow , IndustryViewWindow , IndustryDirectoryWindow , MainWindow , NetworkLobbyWindow , MessageHistoryWindow , OrdersWindow , OskWindow , BuildRoadStationWindow , SmallMapWindow , CompanyStationsWindow , ScenarioEditorLandscapeGenerationWindow , TimetableWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , TownAuthorityWindow , TownDirectoryWindow , TransparenciesWindow , RefitWindow , VehicleListWindow , VehicleDetailsWindow , Window
- OnPlaceDrag() : BuildRailToolbarWindow , BuildAirToolbarWindow , BuildDocksToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , BuildTreesWindow , Window
- OnPlaceMouseUp() : BuildTreesWindow , BuildRailToolbarWindow , BuildAirToolbarWindow , BuildDocksToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , Window
- OnPlaceObject() : BuildDocksToolbarWindow , BuildAirToolbarWindow , CompanyWindow , BuildIndustryWindow , OrdersWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , MainToolbarWindow , BuildTreesWindow , Window , ScenarioEditorToolbarWindow
- OnPlaceObjectAbort() : BuildAirToolbarWindow , DepotWindow , BuildDocksToolbarWindow , VehicleGroupWindow , OrdersWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , BuildTreesWindow , Window , BuildIndustryWindow , CompanyWindow
- OnPlacePresize() : BuildRailToolbarWindow , BuildRoadToolbarWindow , Window , BuildDocksToolbarWindow
- OnQueryTextFinished() : BuildVehicleWindow , CheatWindow , SelectCompanyManagerFaceWindow , OrdersWindow , DepotWindow , CreateScenarioWindow , VehicleGroupWindow , IndustryViewWindow , NetworkJoinStatusWindow , SpriteAlignerWindow , NewGRFParametersWindow , GameSettingsWindow , CustomCurrencyWindow , StationViewWindow , ScenarioEditorToolbarWindow , TownViewWindow , VehicleDetailsWindow , Window , WaypointWindow , TimetableWindow , CompanyWindow , AISettingsWindow
- OnReceiveContentInfo() : NetworkContentListWindow , BootstrapAskForDownloadWindow , ContentCallback
- OnReceiveData() : ClientNetworkContentSocketHandler , HTTPCallback
- OnResize() : NewGRFParametersWindow , NetworkLobbyWindow , BuildBridgeWindow , BuildIndustryWindow , IndustryViewWindow , VehicleGroupWindow , DepotWindow , AIListWindow , AISettingsWindow , MessageHistoryWindow , CompanyStationsWindow , VehicleViewWindow , SelectStationWindow< T > , BuildRailStationWindow , TimetableWindow , BuildObjectWindow , ReplaceVehicleWindow , BuildVehicleWindow , GoalListWindow , VehicleDetailsWindow , IndustryDirectoryWindow , IndustryCargoesWindow , MainWindow , SpriteAlignerWindow , OrdersWindow , GameSettingsWindow , StationViewWindow , TownViewWindow , TownDirectoryWindow , RefitWindow , SubsidyListWindow , Window , VehicleListWindow , ExtraViewportWindow , WaypointWindow
- OnRightClick() : DepotWindow , Window , SmallMapWindow
- OnScroll() : ExtraViewportWindow , Window , SmallMapWindow , MainWindow
- OnTick() : BaseGraphWindow , VehicleGroupWindow , ScenarioEditorToolbarWindow , SmallMapWindow , CompanyStationsWindow , NewsWindow , VehicleViewWindow , DropdownWindow , Window , BuildRoadStationWindow , AboutWindow , CompanyLeagueWindow , StatusBarWindow , MainToolbarWindow , PerformanceRatingDetailWindow , AISettingsWindow , BuildAirportWindow , BuildDocksStationWindow , PaymentRatesGraphWindow , BuildIndustryWindow , NewGRFParametersWindow , BuildRailStationWindow , SelectStationWindow< T > , VehicleListWindow
- OnTimeout() : CompanyStationsWindow , CustomCurrencyWindow , TerraformToolbarWindow , ScenarioEditorToolbarWindow , BuildIndustryWindow , MainToolbarWindow , OrdersWindow , GameSettingsWindow , DepotWindow , ScenarioEditorLandscapeGenerationWindow , BuildTreesWindow , Window , CheatWindow , CreateScenarioWindow , IndustryViewWindow
- 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 Tcls *() : CCountedPtr< Tcls_ >
- operator delete() : Window , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tpool_type, Tcache, Tzero >::PoolItem< Tpool > , GRFText , ZeroedMemoryAllocator
- operator delete[]() : ZeroedMemoryAllocator
- operator enum_type() : SimpleTinyEnumT< enum_type, storage_type > , TinyEnumT< Tenum_t >
- operator new() : GRFText , ZeroedMemoryAllocator , 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 >
- operator Tcls *() : CCountedPtr< Tcls_ >
- operator TileIndex() : TileIterator
- operator!=() : RefitOption , CargoSummaryItem , NetworkAddress
- operator&() : CCountedPtr< Tcls_ >
- operator&=() : SimpleTinyEnumT< enum_type, storage_type >
- operator()() : StringCompare
- operator*=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator++() : TinyEnumT< Tenum_t > , AirportTileIterator , TinyEnumT< Tenum_t > , TileIterator , AirportTileTableIterator , OrthogonalTileIterator , DiagonalTileIterator
- operator+=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator->() : CCountedPtr< Tcls_ > , SmallStackSafeStackAlloc< T, length >
- operator<() : CStrA , NetworkAddress
- operator=() : TinyEnumT< Tenum_t > , SimpleTinyEnumT< enum_type, storage_type > , AdaptT< T > , CCountedPtr< Tcls_ > , SimpleTinyEnumT< enum_type, storage_type > , TinyEnumT< Tenum_t > , CCountedPtr< Tcls_ > , CStrA , SmallVector< T, S > , CStrA
- operator==() : NetworkAddress , RefitOption
- operator[]() : SmallVector< T, S > , CargoArray , FixedSizeArray< T, C > , TileMatrix< T, N > , FixedSizeArray< T, C > , SmallArray< T, B, N > , SmallVector< T, S > , CargoArray , SmallMap< T, U, S > , SmallArray< T, B, N >
- operator|=() : SimpleTinyEnumT< enum_type, storage_type >
- opf : PathfinderSettings
- opt : GetOptData
- options : GetOptData
- order : GameSettings
- Order() : Order
- order : RefitWindow , 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
- OrderWaitingCargo() : StationViewWindow
- ordinal_width : CompanyLeagueWindow
- orientation : RailStationGUISettings
- orig_list : NewGRFWindow
- orig_str_buf : OskWindow
- 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 : FINAL
- overtaking_ctr : FINAL
- own_name : LanguagePackHeader
- owner : Industry , CargoPayment , Group , BaseStation , Window , Vehicle , TileDesc
- owner_type : TileDesc
- OwnerDeityFilter() : SignList
- OwnerVisibilityFilter() : SignList