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
- OC_AGE : AIOrder
- OC_INVALID : AIOrder
- OC_LOAD_PERCENTAGE : AIOrder
- OC_MAX_SPEED : AIOrder
- OC_RELIABILITY : AIOrder
- OC_REQUIRES_SERVICE : AIOrder
- OC_UNCONDITIONALLY : AIOrder
- occupied : RoadStop::Entry
- offs : TileHighlightData
- offset : Blitter_8bppOptimized::SpriteData , BmpInfo , CompanyManagerFaceBitsInfo , LoggedChange , NIProperty , NICallback , UnmappedChoiceList , OldChunks
- offsets : LanguagePackHeader
- oil_refinery : ExtraPaletteValues
- oil_refinery_limit : GameCreationSettings
- ok_btn : OskWindow
- okay : PBSTileInfo
- old : Vehicle
- old_d : UnmappedChoiceList
- old_economy : CompanyProperties
- old_max_loan_unround : Economy
- old_max_loan_unround_fract : Economy
- old_new_hash : Vehicle
- old_refittable : ShipVehicleInfo
- old_tile : GetNewVehiclePosResult
- oldval : LoggedChange
- OnClick() : PerformanceHistoryGraphWindow , PaymentRatesGraphWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , EndGameHighScoreBaseWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , SelectGameWindow , QueryWindow , MusicTrackSelectionWindow , MusicWindow , NetworkLobbyWindow , NetworkClientListWindow , NetworkJoinStatusWindow , AIListWindow , SpriteAlignerWindow , NewGRFParametersWindow , AISettingsWindow , NewsWindow , MessageHistoryWindow , AIConfigWindow , MessageOptionsWindow , BuildObjectWindow , BuildAirToolbarWindow , OrdersWindow , OskWindow , BuildAirportWindow , BuildRailToolbarWindow , BuildRailStationWindow , ReplaceVehicleWindow , BuildSignalWindow , BuildRailDepotWindow , BuildBridgeWindow , BuildRailWaypointWindow , BuildRoadToolbarWindow , BuildVehicleWindow , BuildRoadDepotWindow , BuildRoadStationWindow , CheatWindow , GameOptionsWindow , GameDifficultyWindow , CompanyFinancesWindow , GameSettingsWindow , CustomCurrencyWindow , SelectCompanyLiveryWindow , SmallMapWindow , CompanyStationsWindow , SelectCompanyManagerFaceWindow , StationViewWindow , SelectStationWindow< T > , CompanyWindow , StatusBarWindow , SubsidyListWindow , BuyCompanyWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , SetDateWindow , TimetableWindow , MainToolbarWindow , DepotWindow , ScenarioEditorToolbarWindow , TownAuthorityWindow , BuildDocksToolbarWindow , TownViewWindow , TownDirectoryWindow , BuildDocksStationWindow , TransparenciesWindow , BuildTreesWindow , BuildDocksDepotWindow , RefitWindow , VehicleListWindow , EnginePreviewWindow , VehicleDetailsWindow , VehicleViewWindow , CreateScenarioWindow , ExtraViewportWindow , WaypointWindow , GenerateProgressWindow , DropdownWindow , Window , GraphLegendWindow , BaseGraphWindow
- OnConnect() : TCPClientConnecter , NetworkContentConnecter , ContentCallback , NetworkContentListWindow , ConsoleContentCallback , TCPConnecter , NetworkHTTPContentConnecter , TCPQueryConnecter
- OnCTRLStateChange() : DepotWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , Window
- OnDisconnect() : ConsoleContentCallback , ContentCallback
- OnDownloadComplete() : ConsoleContentCallback , ContentCallback , NetworkContentListWindow
- OnDownloadProgress() : ContentCallback , NetworkContentDownloadStatusWindow
- 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 , ErrmsgWindow , TownAuthorityWindow , TownDirectoryWindow , Window
- OnInit() : BuildVehicleWindow , SelectCompanyManagerFaceWindow , PaymentRatesGraphWindow , BuildIndustryWindow , IndustryCargoesWindow , LandInfoWindow , MessageOptionsWindow , SmallMapWindow , TerraformToolbarWindow , RefitWindow , Window
- OnInitialPosition() : BuildBridgeWindow , SetDateWindow , ErrmsgWindow , TooltipsWindow , NetworkClientListPopupWindow , NewsWindow , StatusBarWindow , TerraformToolbarWindow , TransparenciesWindow , DropdownWindow , Window
- OnInvalidateData() : SubsidyListWindow , TimetableWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , TownViewWindow , TownDirectoryWindow , FoundTownWindow , TransparenciesWindow , BuildTreesWindow , RefitWindow , VehicleListWindow , VehicleDetailsWindow , VehicleViewWindow , ExtraViewportWindow , WaypointWindow , Window , AIListWindow , AISettingsWindow , AIConfigWindow , AIDebugWindow , ReplaceVehicleWindow , BuildVehicleWindow , SelectCompanyLiveryWindow , DepotWindow , BuildDocksToolbarWindow , SaveLoadWindow , GenerateLandscapeWindow , GraphLegendWindow , BaseGraphWindow , PaymentRatesGraphWindow , CompanyLeagueWindow , PerformanceRatingDetailWindow , VehicleGroupWindow , BuildIndustryWindow , IndustryViewWindow , IndustryDirectoryWindow , IndustryCargoesWindow , SelectGameWindow , MainWindow , LandInfoWindow , ErrmsgWindow , MusicTrackSelectionWindow , MusicWindow , NetworkChatWindow , NetworkContentListWindow , NetworkGameWindow , SpriteAlignerWindow , NewGRFParametersWindow , NewGRFWindow , NewsWindow , MessageHistoryWindow , MessageOptionsWindow , OrdersWindow , OskWindow , BuildSignalWindow , BuildRoadToolbarWindow , GameOptionsWindow , GameDifficultyWindow , SignListWindow , SmallMapWindow , CompanyStationsWindow , SelectStationWindow< T > , StatusBarWindow
- OnKeyPress() : BuildAirToolbarWindow , BuildBridgeWindow , IConsoleWindow , BuildDocksToolbarWindow , EndGameHighScoreBaseWindow , MainWindow , ErrmsgWindow , QueryWindow , NewsWindow , OrdersWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , Window
- online : NetworkGameList
- OnMouseDrag() : DepotWindow , OrdersWindow , RefitWindow , Window
- OnMouseLoop() : IConsoleWindow , ErrmsgWindow , TooltipsWindow , NetworkClientListPopupWindow , OskWindow , DropdownWindow , Window
- OnMouseOver() : NetworkClientListWindow , Window
- OnMouseWheel() : IConsoleWindow , MainWindow , SmallMapWindow , ExtraViewportWindow , Window
- OnNewDay() : Aircraft , RoadVehicle , Ship , Train , Vehicle
- OnPaint() : MainWindow , VehicleListWindow , EndGameWindow , TimetableWindow , TownDirectoryWindow , OrdersWindow , BuildAirportWindow , ReplaceVehicleWindow , BuildVehicleWindow , CompanyFinancesWindow , SelectCompanyLiveryWindow , SelectCompanyManagerFaceWindow , CompanyWindow , 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() : BuildAirToolbarWindow , CompanyWindow , BuildDocksToolbarWindow , BuildIndustryWindow , BuildRailToolbarWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , MainToolbarWindow , ScenarioEditorToolbarWindow , BuildTreesWindow , Window , ScenarioEditorLandscapeGenerationWindow , OrdersWindow
- OnPlaceObjectAbort() : BuildAirToolbarWindow , CompanyWindow , DepotWindow , BuildDocksToolbarWindow , VehicleGroupWindow , BuildIndustryWindow , OrdersWindow , BuildRoadToolbarWindow , TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , Window , BuildTreesWindow , BuildRailToolbarWindow
- OnPlacePresize() : BuildDocksToolbarWindow , BuildRailToolbarWindow , Window , BuildRoadToolbarWindow
- OnQueryTextFinished() : TownViewWindow , AISettingsWindow , BuildVehicleWindow , CheatWindow , SelectCompanyManagerFaceWindow , CompanyWindow , DepotWindow , VehicleGroupWindow , IndustryViewWindow , NetworkJoinStatusWindow , NewGRFParametersWindow , OrdersWindow , GameSettingsWindow , StationViewWindow , TimetableWindow , ScenarioEditorToolbarWindow , VehicleDetailsWindow , WaypointWindow , Window , CustomCurrencyWindow , SpriteAlignerWindow , CreateScenarioWindow
- OnReceiveContentInfo() : ContentCallback , NetworkContentListWindow
- OnReceiveData() : HTTPCallback , ClientNetworkContentSocketHandler
- OnResize() : BuildBridgeWindow , BuildVehicleWindow , TimetableWindow , AIListWindow , ReplaceVehicleWindow , WaypointWindow , VehicleListWindow , BuildIndustryWindow , IndustryCargoesWindow , GameSettingsWindow , CompanyStationsWindow , BuildObjectWindow , NetworkLobbyWindow , RefitWindow , IndustryViewWindow , NewGRFParametersWindow , TownDirectoryWindow , AISettingsWindow , BuildRailStationWindow , DepotWindow , VehicleGroupWindow , IndustryDirectoryWindow , SpriteAlignerWindow , MessageHistoryWindow , OrdersWindow , MainWindow , StationViewWindow , SelectStationWindow< T > , SubsidyListWindow , TownViewWindow , VehicleDetailsWindow , ExtraViewportWindow , Window , VehicleViewWindow
- OnRightClick() : SmallMapWindow , Window , DepotWindow
- OnScroll() : Window , MainWindow , SmallMapWindow , ExtraViewportWindow
- OnTick() : AboutWindow , StatusBarWindow , CompanyLeagueWindow , Window , BuildDocksStationWindow , ScenarioEditorToolbarWindow , NewGRFParametersWindow , VehicleViewWindow , CompanyStationsWindow , BuildAirportWindow , NewsWindow , VehicleGroupWindow , BaseGraphWindow , MainToolbarWindow , AISettingsWindow , PaymentRatesGraphWindow , PerformanceRatingDetailWindow , BuildIndustryWindow , BuildRailStationWindow , BuildRoadStationWindow , SmallMapWindow , SelectStationWindow< T > , VehicleListWindow , DropdownWindow
- OnTimeout() : TerraformToolbarWindow , ScenarioEditorLandscapeGenerationWindow , MainToolbarWindow , BuildTreesWindow , CustomCurrencyWindow , CreateScenarioWindow , BuildIndustryWindow , DepotWindow , GameSettingsWindow , CheatWindow , IndustryViewWindow , OrdersWindow , CompanyStationsWindow , ScenarioEditorToolbarWindow , Window
- OnVehicleSelect() : DepotWindow , Window
- OpenCount() : CNodeList_HashTableT< Titem_, Thash_bits_open_, Thash_bits_closed_ >
- 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() : GRFText , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tcache, Tzero >::PoolItem< Tpool > , Window , ZeroedMemoryAllocator
- operator delete[]() : ZeroedMemoryAllocator
- operator enum_type() : SimpleTinyEnumT< enum_type, storage_type > , TinyEnumT< Tenum_t >
- operator new() : GRFText , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tcache, Tzero >::PoolItem< Tpool > , ZeroedMemoryAllocator , Pool< Titem, Tindex, Tgrowth_step, Tmax_size, Tcache, Tzero >::PoolItem< Tpool > , GRFText
- operator new[]() : Window , ZeroedMemoryAllocator
- operator T &() : AdaptT< T >
- operator T *() : SmallStackSafeStackAlloc< T, length >
- operator Tcls *() : CCountedPtr< Tcls_ >
- operator TileIndex() : TileIterator
- operator!=() : NetworkAddress , RefitOption , CargoSummaryItem
- operator&() : CCountedPtr< Tcls_ >
- operator&=() : SimpleTinyEnumT< enum_type, storage_type >
- operator()() : StringCompare
- operator*=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator++() : TinyEnumT< Tenum_t > , TileIterator , OrthogonalTileIterator , TinyEnumT< Tenum_t > , DiagonalTileIterator
- operator+=() : OverflowSafeInt< T, T_MAX, T_MIN >
- operator->() : CCountedPtr< Tcls_ > , SmallStackSafeStackAlloc< T, length > , CCountedPtr< Tcls_ >
- operator<() : NetworkAddress , CStrA
- operator=() : SimpleTinyEnumT< enum_type, storage_type > , CStrA , TinyEnumT< Tenum_t > , CCountedPtr< Tcls_ > , AdaptT< T > , CStrA , TinyEnumT< Tenum_t > , SimpleTinyEnumT< enum_type, storage_type > , CCountedPtr< Tcls_ >
- operator==() : NetworkAddress , RefitOption
- operator[]() : SmallArray< T, B, N > , FixedSizeArray< T, C > , SmallVector< T, S > , CargoArray , SmallMap< T, U, S > , CargoArray
- operator|=() : SimpleTinyEnumT< enum_type, storage_type >
- opf : PathfinderSettings
- order : RefitWindow , Listing , GameSettings
- Order() : Order
- ORDER_CURRENT : AIOrder
- ORDER_INVALID : AIOrder
- 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
- OrderCondition : AIOrder
- OrderGetSel() : OrdersWindow
- OrderHotkey_NoLoad() : OrdersWindow
- OrderHotkey_NoUnload() : OrdersWindow
- OrderHotkey_Transfer() : OrdersWindow
- orderindex : OrderBackup
- OrderList() : OrderList
- OrderPlaceObjectState : OrdersWindow
- OrderPosition : AIOrder
- orders : Vehicle , OrderBackup
- 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
- overdrawn_ops : Squirrel
- Overflowed() : SmallSet< Tdir, items >
- override : GRFFileProps
- OverrideManagerBase() : OverrideManagerBase
- overtaking : RoadVehicle
- overtaking_ctr : RoadVehicle
- own_name : LanguagePackHeader
- owner : Window , Group , Vehicle , Industry , TileDesc , BaseStation , CargoPayment
- owner_type : TileDesc