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

### - i -

- IConsoleLine() : IConsoleLine
- id : StationClass , ThreadObject_Win32
- image : ParentSpriteToDraw
- image_1 : DrawIndustryAnimationStruct
- image_2 : DrawIndustryAnimationStruct
- image_3 : DrawIndustryAnimationStruct
- improved_load : OrderSettings
- in_window : CursorVars
- Include() : SmallVector< T, S >
- incoming_cargo_waiting : Industry
- IncreaseDoCommandCosts() : AIObject
- ind : ProbabilityHelper
- index : PoolItem< T, Tid, Tpool > , SettingEntrySetting
- indtype : Station
- indtypes : StationNameInformation
- IndustryNameSorter() : IndustryDirectoryWindow
- IndustryProductionSorter() : IndustryDirectoryWindow
- IndustryTransportedCargoSorter() : IndustryDirectoryWindow
- IndustryTypeSorter() : IndustryDirectoryWindow
- inflation : EconomySettings
- info : NetworkGameList , GRFConfig
- Info() : AILog
- IniFile() : IniFile
- IniGroup() : IniGroup
- IniItem() : IniItem
- Init() : CBlobBaseSimple , SettingEntry , SettingsPage
- init_read : SaveLoadFormat
- init_write : SaveLoadFormat
- InitEmpty() : CBlobBaseSimple
- initial_city_size : EconomySettings
- initial_interest : DifficultySettings
- Initialize() : Window
- initialized : AIAbstractList
- input_cargo_multiplier : IndustrySpec
- Insert() : SmallMap< T, U, S >
- InsertClosedNode() : CNodeList_HashTableT< Titem_, Thash_bits_open_, Thash_bits_closed_ >
- InsertConditionalOrder() : AIOrder
- InsertEvent() : AIEventController
- InsertOpenNode() : CNodeList_HashTableT< Titem_, Thash_bits_open_, Thash_bits_closed_ >
- InsertOrder() : AIOrder
- InsertOrderAt() : OrderList
- invalid : MakeEnumPropsT< Tenum_t, Tstorage_t, Tbegin, Tend, Tinvalid > , TinyEnumT< Tenum_t >
- InvalidateCache() : CargoList
- InvalidateWidget() : Window
- InvalidVehicle() : InvalidVehicle
- ip : NetworkGameList
- IsActionAvailable() : AITown
- IsAirportInformationAvailable() : AIAirport
- IsAirportTile() : AIAirport
- IsArticulated() : AIEngine , AIVehicle
- IsAwarded() : AISubsidy
- IsBridgeTile() : AIBridge
- IsBuildable() : AITile
- IsBuildableRectangle() : AITile
- IsBuiltOnWater() : AIIndustry , AIIndustryType
- IsBuoy() : Station
- IsBuoyTile() : AIMarine
- IsCanalTile() : AIMarine
- IsCargoAccepted() : AIIndustry
- IsCoastTile() : AITile
- IsCompleteTimetable() : OrderList
- IsConditionalOrder() : AIOrder
- IsCurrentOrderPartOfOrderList() : AIOrder
- IsDesertTile() : AITile
- IsDisabledVehicleType() : AIGameSettings
- IsDockTile() : AIMarine
- IsDriveThroughRoadStationTile() : AIRoad
- IsEmpty() : AIAbstractList , CArrayT< Titem_, Tblock_size_, Tnum_blocks_ > , CBinaryHeapT< Titem_ > , CBlobBaseSimple , CFixedSizeArrayT< Titem_, Tcapacity_ > , SmallSet< Tdir, items >
- IsEntranceBusy() : RoadStop
- IsEventWaiting() : AIEventController
- IsFarmTile() : AITile
- IsFreeBay() : RoadStop
- IsFreight() : AICargo
- IsFull() : CArrayT< Titem_, Tblock_size_, Tnum_blocks_ > , CBinaryHeapT< Titem_ > , CFixedSizeArrayT< Titem_, Tcapacity_ > , SmallSet< Tdir, items >
- IsGotoDepotOrder() : AIOrder
- IsGotoStationOrder() : AIOrder
- IsGotoWaypointOrder() : AIOrder
- IsHalftileSlope() : AITile
- IsHangarTile() : AIAirport
- IsIn() : SmallSet< Tdir, items >
- IsInDepot() : AIVehicle
- IsLevelCrossingTile() : AIRail
- IsLockTile() : AIMarine
- IsMine() : AICompany
- IsNull() : CCountedPtr< Tcls_ >
- IsOpenTTDBaseGRF() : GRFConfig
- IsRailDepotTile() : AIRail
- IsRailStationTile() : AIRail
- IsRailTile() : AIRail
- IsRailTypeAvailable() : AIRail
- IsRailWaypointTile() : AIRail
- IsRawIndustry() : IndustrySpec , AIIndustryType
- IsRoadDepotTile() : AIRoad
- IsRoadStationTile() : AIRoad
- IsRoadTile() : AIRoad
- IsRoadTypeAvailable() : AIRoad
- IsRockTile() : AITile
- IsRoughTile() : AITile
- IsShared() : OrderList
- IsSnowTile() : AITile
- IsStationTile() : AITile
- IsSteepSlope() : AITile
- IsStoppedInDepot() : AIVehicle
- IsTunnelTile() : AITunnel
- IsValid() : CargoPacket , RoadStop , Station , AIGameSettings , OrderList
- IsValidAirportType() : AIAirport
- IsValidBridge() : AIBridge
- IsValidCargo() : AICargo
- IsValidConditionalOrder() : AIOrder
- IsValidEngine() : AIEngine
- IsValidGroup() : AIGroup
- IsValidIndustry() : AIIndustry
- IsValidIndustryType() : AIIndustryType
- IsValidSign() : AISign
- IsValidStation() : AIStation
- IsValidSubsidy() : AISubsidy
- IsValidTile() : AIMap
- IsValidTown() : AITown
- IsValidVehicle() : AIVehicle
- IsValidVehicleOrder() : AIOrder
- IsValidWaypoint() : AIWaypoint
- IsVehicleInSharedOrdersList() : OrderList
- IsWagon() : AIEngine
- IsWaterDepotTile() : AIMarine
- IsWaterTile() : AITile
- IsWidgetDisabled() : Window
- IsWidgetFocused() : Window
- IsWidgetGloballyFocused() : Window
- IsWidgetHidden() : Window
- IsWidgetLowered() : Window
- IsWithinTownInfluence() : AITown , AIStation , AITile
- item : IniGroup
- item_size : OldMemoryPoolBase
- items : AIAbstractList , SmallVector< T, S >
- Items() : SmallSet< Tdir, items >