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

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• offset : CompanyManagerFaceBitsInfo , LoggedChange
• oil_refinery_limit : GameCreationSettings
• okay : PBSTileInfo
• old_tile : GetNewVehiclePosResult
• oldval : LoggedChange
• OnClick() : CompanyWindow , VehicleListWindow , Window , IndustryDirectoryWindow , QueryWindow , NewGRFAddWindow , NewGRFWindow , BuildRailToolbarWindow , ReplaceVehicleWindow , CompanyStationsWindow , StationViewWindow
• OnCTRLStateChange() : BuildRailToolbarWindow , Window
• OnDoubleClick() : NewGRFAddWindow , Window
• OnDragDrop() : Window
• OnDropdownSelect() : ReplaceVehicleWindow , IndustryDirectoryWindow , NewGRFWindow , CompanyStationsWindow , VehicleListWindow , Window
• OnHundredthTick() : CompanyWindow , Window
• OnInvalidateData() : IndustryDirectoryWindow , NewGRFWindow , CompanyStationsWindow , VehicleListWindow , Window , ReplaceVehicleWindow
• OnKeyPress() : QueryWindow , BuildRailToolbarWindow , Window
• online : NetworkGameList
• OnMouseLoop() : Window
• OnMouseOver() : Window
• OnMouseWheel() : Window
• OnPaint() : ReplaceVehicleWindow , CompanyWindow , EndGameWindow , IndustryDirectoryWindow , QueryWindow , NewGRFAddWindow , NewGRFWindow , BuildRailToolbarWindow , CompanyStationsWindow , StationViewWindow , VehicleListWindow , Window
• OnPlaceDrag() : BuildRailToolbarWindow , Window
• OnPlaceMouseUp() : BuildRailToolbarWindow , Window
• OnPlaceObject() : CompanyWindow , BuildRailToolbarWindow , Window
• OnPlaceObjectAbort() : BuildRailToolbarWindow , Window , CompanyWindow
• OnPlacePresize() : BuildRailToolbarWindow , Window
• OnQueryTextFinished() : CompanyWindow , NewGRFWindow , StationViewWindow , Window
• OnResize() : CompanyStationsWindow , ReplaceVehicleWindow , IndustryDirectoryWindow , NewGRFWindow , StationViewWindow , VehicleListWindow , Window
• OnRightClick() : Window
• OnScroll() : Window
• OnTick() : CompanyStationsWindow , VehicleListWindow , Window
• OnTimeout() : CompanyStationsWindow , Window
• OnTransfer : CStrT< Tchar, TcaseInsensitive >
• OpenCount() : CNodeList_HashTableT< Titem_, Thash_bits_open_, Thash_bits_closed_ >
• operator &() : CCountedPtr< Tcls_ >
• operator const T &() : AdaptT< T >
• operator const Tcls *() : CCountedPtr< Tcls_ >
• operator delete() : PoolItem< T, Tid, Tpool > , ZeroedMemoryAllocator
• operator delete[]() : ZeroedMemoryAllocator
• operator enum_type() : TinyEnumT< Tenum_t >
• operator new() : PoolItem< T, Tid, Tpool > , ZeroedMemoryAllocator , PoolItem< T, Tid, Tpool >
• operator new[]() : ZeroedMemoryAllocator
• operator T &() : AdaptT< T >
• operator T *() : SmallStackSafeStackAlloc< T, length >
• operator Tcls *() : CCountedPtr< Tcls_ >
• operator()() : PoolItemIndexLess< T >
• operator*=() : OverflowSafeInt< T, T_MAX, T_MIN >
• operator++() : TinyEnumT< Tenum_t >
• operator+=() : OverflowSafeInt< T, T_MAX, T_MIN >
• operator->() : SmallStackSafeStackAlloc< T, length > , CCountedPtr< Tcls_ >
• operator<() : CStrT< Tchar, TcaseInsensitive >
• operator=() : TinyEnumT< Tenum_t > , CStrT< Tchar, TcaseInsensitive > , AdaptT< T > , CCountedPtr< Tcls_ > , TinyEnumT< Tenum_t > , CCountedPtr< Tcls_ > , CStrT< Tchar, TcaseInsensitive >
• operator[]() : SmallMap< T, U, S > , SmallVector< T, S > , CFixedSizeArrayT< Titem_, Tcapacity_ > , CArrayT< Titem_, Tblock_size_, Tnum_blocks_ > , CFixedSizeArrayT< Titem_, Tcapacity_ >
• opf : PathfinderSettings
• order : GameSettings
• order_review_system : GUISettings
• OrderList() : OrderList
• orig_list : NewGRFWindow
• other_company_name : CompanyNewsInformation
• Overflowed() : SmallSet< Tdir, items >
• override : GRFFileProps
• owner : TileDesc , Industry
• owner_type : TileDesc