(svn r16718) -Codechange: make IsFreeWagon() member of Train

src/ai/api/ai_vehicle.cpp

@@ -20,7 +20,7 @@
 /* static */ bool AIVehicle::IsValidVehicle(VehicleID vehicle_id)
 {
 	const Vehicle *v = ::Vehicle::GetIfValid(vehicle_id);
-	return v != NULL && v->owner == _current_company && (v->IsPrimaryVehicle() || (v->type == VEH_TRAIN && ::IsFreeWagon(v)));
+	return v != NULL && v->owner == _current_company && (v->IsPrimaryVehicle() || (v->type == VEH_TRAIN && ::Train::From(v)->IsFreeWagon()));
 }
 
 /* static */ int32 AIVehicle::GetNumWagons(VehicleID vehicle_id)

src/group_cmd.cpp

@@ -368,7 +368,7 @@ void SetTrainGroupID(Train *v, GroupID new_g)
  */
 void UpdateTrainGroupID(Train *v)
 {
-	assert(v->IsFrontEngine() || IsFreeWagon(v));
+	assert(v->IsFrontEngine() || v->IsFreeWagon());
 
 	GroupID new_g = v->IsFrontEngine() ? v->group_id : (GroupID)DEFAULT_GROUP;
 	for (Vehicle *u = v; u != NULL; u = u->Next()) {

src/newgrf_engine.cpp

@@ -135,7 +135,7 @@ static int MapOldSubType(const Vehicle *v)
 	switch (v->type) {
 		case VEH_TRAIN:
 			if (IsTrainEngine(v)) return 0;
-			if (IsFreeWagon(v)) return 4;
+			if (Train::From(v)->IsFreeWagon()) return 4;
 			return 2;
 		case VEH_ROAD:
 		case VEH_SHIP:     return 0;

src/saveload/afterload.cpp

@@ -985,7 +985,7 @@ bool AfterLoadGame()
 		}
 
 		FOR_ALL_TRAINS(v) {
-			if (v->IsFrontEngine() || IsFreeWagon(v)) TrainConsistChanged(v, true);
+			if (v->IsFrontEngine() || v->IsFreeWagon()) TrainConsistChanged(v, true);
 		}
 
 	}

src/saveload/vehicle_sl.cpp

@@ -28,7 +28,7 @@ void ConnectMultiheadedTrains()
 	}
 
 	FOR_ALL_TRAINS(v) {
-		if (v->IsFrontEngine() || IsFreeWagon(v)) {
+		if (v->IsFrontEngine() || v->IsFreeWagon()) {
 			/* Two ways to associate multiheaded parts to each other:
 			 * sequential-matching: Trains shall be arranged to look like <..>..<..>..<..>..
 			 * bracket-matching:    Free vehicle chains shall be arranged to look like ..<..<..>..<..>..>..

src/train.h

@@ -327,11 +327,16 @@ struct Train : public SpecializedVehicle<Train, VEH_TRAIN> {
 	bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
 
 	/**
-	 * Check if a vehicle is front engine
+	 * Check if train is a front engine
-	 * @param v vehicle to check
+	 * @return Returns true if train is a front engine
-	 * @return Returns true if vehicle is a front engine
 	 */
 	FORCEINLINE bool IsFrontEngine() const { return HasBit(this->subtype, TS_FRONT); }
+
+	/**
+	 * Check if train is a free wagon (got no engine in front of it)
+	 * @return Returns true if train is a free wagon
+	 */
+	FORCEINLINE bool IsFreeWagon() const { return HasBit(this->subtype, TS_FREE_WAGON); }
 };
 
 #define FOR_ALL_TRAINS(var) FOR_ALL_VEHICLES_OF_TYPE(Train, var)

src/train_cmd.cpp

@@ -217,7 +217,7 @@ void TrainConsistChanged(Train *v, bool same_length)
 {
 	uint16 max_speed = UINT16_MAX;
 
-	assert(v->IsFrontEngine() || IsFreeWagon(v));
+	assert(v->IsFrontEngine() || v->IsFreeWagon());
 
 	const RailVehicleInfo *rvi_v = RailVehInfo(v->engine_type);
 	EngineID first_engine = v->IsFrontEngine() ? v->engine_type : INVALID_ENGINE;
@@ -752,7 +752,7 @@ static void NormalizeTrainVehInDepot(const Train *u)
 {
 	const Train *v;
 	FOR_ALL_TRAINS(v) {
-		if (IsFreeWagon(v) && v->tile == u->tile &&
+		if (v->IsFreeWagon() && v->tile == u->tile &&
 				v->track == TRACK_BIT_DEPOT) {
 			if (CmdFailed(DoCommand(0, v->index | (u->index << 16), 1, DC_EXEC,
 					CMD_MOVE_RAIL_VEHICLE)))
@@ -1030,7 +1030,7 @@ static void AddWagonToConsist(Train *v, Train *dest)
  */
 static void NormaliseTrainConsist(Train *v)
 {
-	if (IsFreeWagon(v)) return;
+	if (v->IsFreeWagon()) return;
 
 	assert(v->IsFrontEngine());
 
@@ -4459,7 +4459,7 @@ bool Train::Tick()
 		if (!TrainLocoHandler(this, false)) return false;
 
 		return TrainLocoHandler(this, true);
-	} else if (IsFreeWagon(this) && (this->vehstatus & VS_CRASHED)) {
+	} else if (this->IsFreeWagon() && (this->vehstatus & VS_CRASHED)) {
 		/* Delete flooded standalone wagon chain */
 		if (++this->crash_anim_pos >= 4400) {
 			delete this;

src/vehiclelist.cpp

@@ -27,14 +27,16 @@ void BuildDepotVehicleList(VehicleType type, TileIndex tile, VehicleList *engine
 		if (v->tile != tile) continue;
 
 		switch (type) {
-			case VEH_TRAIN:
+			case VEH_TRAIN: {
-				if (IsArticulatedPart(v) || IsRearDualheaded(v)) continue;
+				const Train *t = Train::From(v);
-				if (Train::From(v)->track != TRACK_BIT_DEPOT) continue;
+				if (IsArticulatedPart(t) || IsRearDualheaded(t)) continue;
-				if (wagons != NULL && IsFreeWagon(v->First())) {
+				if (t->track != TRACK_BIT_DEPOT) continue;
-					if (individual_wagons || IsFreeWagon(v)) *wagons->Append() = v;
+				if (wagons != NULL && t->First()->IsFreeWagon()) {
+					if (individual_wagons || t->IsFreeWagon()) *wagons->Append() = t;
 					continue;
 				}
 				break;
+			}
 
 			default:
 				if (!v->IsInDepot()) continue;