#ifndef VARDEF

#define VARDEF extern

#endif

// Forward declarations of structs.

struct Waypoint;

struct Station;

struct ViewPort;

struct DrawPixelInfo;

struct Group;

typedef byte VehicleOrderID;  ///< The index of an order within its current vehicle (not pool related)

typedef EngineID *EngineList; ///< engine list type placeholder acceptable for C code (see helpers.cpp)

/* IDs used in Pools */

typedef uint16 StationID;

static const StationID INVALID_STATION = 0xFFFF;

typedef uint16 RoadStopID;

typedef uint16 WaypointID;

typedef uint16 OrderID;

typedef uint16 SignID;

typedef uint16 GroupID;

typedef uint16 EngineRenewID;