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

- u -

• ui_count : NewGRFClass< Tspec, Tid, Tmax >
• unbalanced : Kdtree< T, TxyFunc, CoordT, DistT >
• unclick_timeout : GSConfigWindow , NewGRFParametersWindow , ScriptSettingsWindow
• undelivered_supply : LinkGraphJob::NodeAnnotation
• UnfocusFocusedWidget() : Window
• UnFoldAll() : SettingsContainer , SettingsPage
• Uninitialize() : AI , Game , Squirrel
• unique_id : ContentInfo
• unitnumber : Vehicle
• unitnumber_digits : BaseVehicleListWindow
• units_force : LocaleSettings
• units_height : LocaleSettings
• units_per_em : FontCache
• units_power : LocaleSettings
• units_velocity : LocaleSettings
• units_velocity_nautical : LocaleSettings
• units_volume : CargoSpec , LocaleSettings
• units_weight : LocaleSettings
• Unload() : VehicleCargoList
• UnloadCount() : VehicleCargoList
• UNLOADED : SocialIntegrationPlugin
• unlock : VideoDriver::VideoBufferLocker
• UnlockVideoBuffer() : VideoDriver , VideoDriver_Cocoa , VideoDriver_SDL_Base , VideoDriver_Win32Base
• UnmappedChoiceList() : UnmappedChoiceList
• UnPack() : VehicleListIdentifier
• UnpackIfValid() : VehicleListIdentifier
• Unpause() : AI , Game , ScriptInstance
• UNPAUSED : TimerGameRealtime
• Unqueue() : LinkGraphSchedule
• UnregisterTimer() : TimerManager< TTimerType >
• UnreserveSingleTrack() : CYapfReserveTrack< Types >
• unrestricted : FlowStat
• Unsafe() : CommandHelper< Tcmd, Tret(*)(DoCommandFlag, Targs...), true >
• unsatisfied_demand : LinkGraphJob::DemandAnnotation
• UnsatisfiedDemandTo() : LinkGraphJob::NodeAnnotation
• unscaled : WidgetDimensions
• Unselect() : ClientNetworkContentSocketHandler
• UnselectAll() : ClientNetworkContentSocketHandler
• UNSELECTED : ContentInfo
• UnselectVehicle() : VehicleGroupWindow
• UNSET : GRFTempEngineData
• unshaded_size : Window
• Unshuffle() : MusicSystem
• UNSUPPORTED_API : SocialIntegrationPlugin
• unwanted : Town
• Update() : Backup< T > , CargoDataEntry , LinkGraph::BaseEdge , OpenGLSprite
• update_frequency : ServerNetworkAdminSocketHandler
• update_interval : FramerateWindow , FrametimeGraphWindow
• update_payment_interval : PaymentRatesGraphWindow
• UpdateAcceleration() : Train
• UpdateAfterLoad() : GroupStatistics
• UpdateAIButtonsState() : ScriptDebugWindow
• UpdateAnnotation() : CapacityAnnotation , DistanceAnnotation
• UpdateAutoRefitState() : OrdersWindow
• UpdateAutoreplace() : GroupStatistics
• UpdateAutoResolution() : VideoDriver
• UpdateBoundingBoxCoordinates() : Vehicle
• UpdateButtons() : BuildObjectWindow
• UpdateCache() : Ship
• UpdateCaretPosition() : Textbuf
• UpdateCursorPosition() : CursorVars
• UpdateCursorPositionRelative() : CursorVars
• UpdateDeltaXY() : Aircraft , DisasterVehicle , EffectVehicle , RoadVehicle , Ship , Train , Vehicle
• UpdateEdge() : LinkGraph::BaseNode
• UpdateFilterByTile() : BuildVehicleWindow
• UpdateFilterState() : NetworkContentListWindow , SettingEntry , SettingsContainer , SettingsPage
• UpdateGSButtonState() : ScriptDebugWindow
• UpdateHistoryScrollpos() : TextfileWindow
• UpdateIfNotInitialized() : WaterRegion
• UpdateInclination() : GroundVehicle< T, Type >
• UpdateLinks() : SmallMapWindow
• UpdateListPos() : NetworkGameWindow
• UpdateListPositionOnKeyPress() : Scrollbar
• UpdateLoadingTile() : CargoPacket
• UpdateLocation() : LinkGraph::BaseNode
• UpdateLogScroll() : ScriptDebugWindow
• UpdateMarkedText() : Textbuf
• UpdateMode() : BuildTreesWindow
• UpdateMultilineWidgetSize() : NWidgetResizeBase
• UpdateNewGRFScanStatus() : ScanProgressWindow
• UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
• UpdateOskState() : OskWindow
• UpdateOverlayCargoes() : LinkGraphLegendWindow
• UpdateOverlayCompanies() : LinkGraphLegendWindow
• UpdatePalette() : OpenGLBackend
• UpdatePaymentRates() : PaymentRatesGraphWindow
• UpdatePosition() : DisasterVehicle , Scrollbar , TrackedViewportSign , Vehicle , ViewportSign
• UpdatePositionAndViewport() : Vehicle
• UpdatePrevNextDisabledState() : StoryBookWindow
• UpdateProfits() : GroupStatistics
• UpdateQueryStringSize() : Window
• UpdateRealOrderIndex() : Vehicle
• UpdateRefittability() : GRFTempEngineData
• UpdateScale() : FrametimeGraphWindow
• UpdateScrollBars() : NewGRFWindow
• UpdateSelectionStates() : TimetableWindow
• UpdateSize() : NWidgetResizeBase , Textbuf
• UpdateSizeAndPosition() : DropdownWindow
• UpdateSpeed() : RoadVehicle , Train
• UpdateStatistics() : BaseGraphWindow
• UpdateStringIter() : Textbuf
• UpdateSupply() : LinkGraph::BaseNode
• UpdateTimetableDuration() : OrderList
• UpdateTotalDuration() : OrderList
• UpdateUnloadingTile() : CargoPacket
• UpdateVerticalSize() : NWidgetResizeBase
• UpdateViewport() : SpecializedVehicle< T, Type > , Vehicle
• UpdateViewportCoordinates() : NWidgetViewport
• UpdateVirtCoord() : BaseStation , Sign , Station , Town , Waypoint
• UpdateVisualEffect() : Vehicle
• UpdateWidgetSize() : Window
• UpdateWidth() : Textbuf
• UpdateZPosition() : GroundVehicle< T, Type >
• UpdateZPositionAndInclination() : GroundVehicle< T, Type >
• upgrade : ContentInfo
• UpgradeCurrent() : NewGRFWindow
• uri : NetworkHTTPRequest
• url : BaseSet< T, Tnum_files, Tsearch_in_tars > , ContentInfo , GRFConfig , ScriptInfo
• usage : LinkGraph::BaseEdge
• Usage() : LinkProperties
• usage : LinkProperties
• use_as_random : AIInfo
• USE_NEXT : LinkRefresher
• use_password : NetworkCompanyInfo , NetworkServerGameInfo
• use_relay_service : NetworkSettings
• UseAsRandomAI() : AIInfo
• used_liveries : GRFLoadedFeatures
• used_set : BaseMedia< Tbase_set >
• used_size : TrueTypeFontCache
• used_triggers : ResolverObject
• UsePaletteAnimation() : Blitter , Blitter_32bppAnim , Blitter_32bppBase , Blitter_40bppAnim , Blitter_8bppBase , Blitter_Null
• user : OrderBackup
• user_def_data : RailVehicleInfo , TrainCache
• UserIsAllowedToChangeNewGRFs() : GUISettings
• UsesHardwareAcceleration() : DriverFactoryBase , FVideoDriver_CocoaOpenGL , FVideoDriver_SDL_OpenGL
• UsesOriginalEconomy() : IndustrySpec
• UseSystemCursor() : VideoDriver , VideoDriver_CocoaOpenGL , VideoDriver_SDL_OpenGL
• UseTextRefStack() : CommandCost
• UsingWallclockUnits() : TimerGameEconomy
• utf16_str : IcuStringIterator
• utf16_to_utf8 : IcuStringIterator , OSXStringIterator , UniscribeStringIterator
• Utf8Encode() : StringBuilder
• uz_min_x : NWidgetResizeBase
• uz_min_y : NWidgetResizeBase
• uz_padding : NWidgetBase
• uz_pip_inter : NWidgetPIPContainer
• uz_pip_post : NWidgetPIPContainer
• uz_pip_pre : NWidgetPIPContainer
• uz_text_lines : NWidgetResizeBase
• uz_text_size : NWidgetResizeBase
• uz_text_spacing : NWidgetResizeBase