Codechange: Use null pointer literal instead of the NULL macro

1 files changed, 37 insertions, 37 deletions

diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index ffab68536..021195127 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -133,16 +133,16 @@ static void TrainDepotMoveVehicle(const Vehicle *wagon, VehicleID sel, const Veh
 
 	if (v == wagon) return;
 
-	if (wagon == NULL) {
-		if (head != NULL) wagon = head->Last();
+	if (wagon == nullptr) {
+		if (head != nullptr) wagon = head->Last();
 	} else {
 		wagon = wagon->Previous();
-		if (wagon == NULL) return;
+		if (wagon == nullptr) return;
 	}
 
 	if (wagon == v) return;
 
-	DoCommandP(v->tile, v->index | (_ctrl_pressed ? 1 : 0) << 20, wagon == NULL ? INVALID_VEHICLE : wagon->index, CMD_MOVE_RAIL_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_MOVE_VEHICLE));
+	DoCommandP(v->tile, v->index | (_ctrl_pressed ? 1 : 0) << 20, wagon == nullptr ? INVALID_VEHICLE : wagon->index, CMD_MOVE_RAIL_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_MOVE_VEHICLE));
 }
 
 static VehicleCellSize _base_block_sizes_depot[VEH_COMPANY_END];    ///< Cell size for vehicle images in the depot view.
@@ -228,7 +228,7 @@ void InitDepotWindowBlockSizes()
 		if (!e->IsEnabled()) continue;
 
 		uint w = TRAININFO_DEFAULT_VEHICLE_WIDTH;
-		if (e->GetGRF() != NULL && is_custom_sprite(e->u.rail.image_index)) {
+		if (e->GetGRF() != nullptr && is_custom_sprite(e->u.rail.image_index)) {
 			w = e->GetGRF()->traininfo_vehicle_width;
 			if (w != VEHICLEINFO_FULL_VEHICLE_WIDTH) {
 				/* Hopeless.
@@ -279,7 +279,7 @@ struct DepotWindow : Window {
 		this->unitnumber_digits = 2;
 
 		this->CreateNestedTree();
-		this->hscroll = (this->type == VEH_TRAIN ? this->GetScrollbar(WID_D_H_SCROLL) : NULL);
+		this->hscroll = (this->type == VEH_TRAIN ? this->GetScrollbar(WID_D_H_SCROLL) : nullptr);
 		this->vscroll = this->GetScrollbar(WID_D_V_SCROLL);
 		/* Don't show 'rename button' of aircraft hangar */
 		this->GetWidget<NWidgetStacked>(WID_D_SHOW_RENAME)->SetDisplayedPlane(type == VEH_AIRCRAFT ? SZSP_NONE : 0);
@@ -469,8 +469,8 @@ struct DepotWindow : Window {
 			/* Clicking on 'line' / 'block' without a vehicle */
 			if (this->type == VEH_TRAIN) {
 				/* End the dragging */
-				d->head  = NULL;
-				d->wagon = NULL;
+				d->head  = nullptr;
+				d->wagon = nullptr;
 				return MODE_DRAG_VEHICLE;
 			} else {
 				return MODE_ERROR; // empty block, so no vehicle is selected
@@ -490,7 +490,7 @@ struct DepotWindow : Window {
 			wagon = true;
 		}
 
-		const Train *v = NULL;
+		const Train *v = nullptr;
 		if (this->type == VEH_TRAIN) {
 			v = Train::From(*veh);
 			d->head = d->wagon = v;
@@ -525,12 +525,12 @@ struct DepotWindow : Window {
 		x -= this->header_width;
 
 		/* find the vehicle in this row that was clicked */
-		for (; v != NULL; v = v->Next()) {
+		for (; v != nullptr; v = v->Next()) {
 			x -= v->GetDisplayImageWidth();
 			if (x < 0) break;
 		}
 
-		d->wagon = (v != NULL ? v->GetFirstEnginePart() : NULL);
+		d->wagon = (v != nullptr ? v->GetFirstEnginePart() : nullptr);
 
 		return MODE_DRAG_VEHICLE;
 	}
@@ -542,8 +542,8 @@ struct DepotWindow : Window {
 	 */
 	void DepotClick(int x, int y)
 	{
-		GetDepotVehiclePtData gdvp = { NULL, NULL };
-		const Vehicle *v = NULL;
+		GetDepotVehiclePtData gdvp = { nullptr, nullptr };
+		const Vehicle *v = nullptr;
 		DepotGUIAction mode = this->GetVehicleFromDepotWndPt(x, y, &v, &gdvp);
 
 		if (this->type == VEH_TRAIN) v = gdvp.wagon;
@@ -553,14 +553,14 @@ struct DepotWindow : Window {
 				return;
 
 			case MODE_DRAG_VEHICLE: { // start dragging of vehicle
-				if (v != NULL && VehicleClicked(v)) return;
+				if (v != nullptr && VehicleClicked(v)) return;
 
 				VehicleID sel = this->sel;
 
 				if (this->type == VEH_TRAIN && sel != INVALID_VEHICLE) {
 					this->sel = INVALID_VEHICLE;
 					TrainDepotMoveVehicle(v, sel, gdvp.head);
-				} else if (v != NULL) {
+				} else if (v != nullptr) {
 					SetObjectToPlaceWnd(SPR_CURSOR_MOUSE, PAL_NONE, HT_DRAG, this);
 					SetMouseCursorVehicle(v, EIT_IN_DEPOT);
 					_cursor.vehchain = _ctrl_pressed;
@@ -728,7 +728,7 @@ struct DepotWindow : Window {
 			uint max_width = ScaleGUITrad(VEHICLEINFO_FULL_VEHICLE_WIDTH);
 			for (uint num = 0; num < this->vehicle_list.size(); num++) {
 				uint width = 0;
-				for (const Train *v = Train::From(this->vehicle_list[num]); v != NULL; v = v->Next()) {
+				for (const Train *v = Train::From(this->vehicle_list[num]); v != nullptr; v = v->Next()) {
 					width += v->GetDisplayImageWidth();
 				}
 				max_width = max(max_width, width);
@@ -839,24 +839,24 @@ struct DepotWindow : Window {
 
 	void OnQueryTextFinished(char *str) override
 	{
-		if (str == NULL) return;
+		if (str == nullptr) return;
 
 		/* Do depot renaming */
-		DoCommandP(0, GetDepotIndex(this->window_number), 0, CMD_RENAME_DEPOT | CMD_MSG(STR_ERROR_CAN_T_RENAME_DEPOT), NULL, str);
+		DoCommandP(0, GetDepotIndex(this->window_number), 0, CMD_RENAME_DEPOT | CMD_MSG(STR_ERROR_CAN_T_RENAME_DEPOT), nullptr, str);
 	}
 
 	bool OnRightClick(Point pt, int widget) override
 	{
 		if (widget != WID_D_MATRIX) return false;
 
-		GetDepotVehiclePtData gdvp = { NULL, NULL };
-		const Vehicle *v = NULL;
+		GetDepotVehiclePtData gdvp = { nullptr, nullptr };
+		const Vehicle *v = nullptr;
 		NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_D_MATRIX);
 		DepotGUIAction mode = this->GetVehicleFromDepotWndPt(pt.x - nwi->pos_x, pt.y - nwi->pos_y, &v, &gdvp);
 
 		if (this->type == VEH_TRAIN) v = gdvp.wagon;
 
-		if (v == NULL || mode != MODE_DRAG_VEHICLE) return false;
+		if (v == nullptr || mode != MODE_DRAG_VEHICLE) return false;
 
 		CargoArray capacity, loaded;
 
@@ -865,7 +865,7 @@ struct DepotWindow : Window {
 
 		/* loop through vehicle chain and collect cargoes */
 		uint num = 0;
-		for (const Vehicle *w = v; w != NULL; w = w->Next()) {
+		for (const Vehicle *w = v; w != nullptr; w = w->Next()) {
 			if (w->cargo_cap > 0 && w->cargo_type < NUM_CARGO) {
 				capacity[w->cargo_type] += w->cargo_cap;
 				loaded  [w->cargo_type] += w->cargo.StoredCount();
@@ -910,7 +910,7 @@ struct DepotWindow : Window {
 	{
 		if (_ctrl_pressed) {
 			/* Share-clone, do not open new viewport, and keep tool active */
-			DoCommandP(this->window_number, v->index, 1, CMD_CLONE_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_BUY_TRAIN + v->type), NULL);
+			DoCommandP(this->window_number, v->index, 1, CMD_CLONE_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_BUY_TRAIN + v->type), nullptr);
 		} else {
 			/* Copy-clone, open viewport for new vehicle, and deselect the tool (assume player wants to changs things on new vehicle) */
 			if (DoCommandP(this->window_number, v->index, 0, CMD_CLONE_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_BUY_TRAIN + v->type), CcCloneVehicle)) {
@@ -965,20 +965,20 @@ struct DepotWindow : Window {
 		}
 
 		NWidgetBase *matrix = this->GetWidget<NWidgetBase>(widget);
-		const Vehicle *v = NULL;
-		GetDepotVehiclePtData gdvp = {NULL, NULL};
+		const Vehicle *v = nullptr;
+		GetDepotVehiclePtData gdvp = {nullptr, nullptr};
 
 		if (this->GetVehicleFromDepotWndPt(pt.x - matrix->pos_x, pt.y - matrix->pos_y, &v, &gdvp) != MODE_DRAG_VEHICLE) return;
 
 		VehicleID new_vehicle_over = INVALID_VEHICLE;
-		if (gdvp.head != NULL) {
-			if (gdvp.wagon == NULL && gdvp.head->Last()->index != this->sel) { // ..at the end of the train.
+		if (gdvp.head != nullptr) {
+			if (gdvp.wagon == nullptr && gdvp.head->Last()->index != this->sel) { // ..at the end of the train.
 				/* NOTE: As a wagon can't be moved at the begin of a train, head index isn't used to mark a drag-and-drop
 				 * destination inside a train. This head index is then used to indicate that a wagon is inserted at
 				 * the end of the train.
 				 */
 				new_vehicle_over = gdvp.head->index;
-			} else if (gdvp.wagon != NULL && gdvp.head != gdvp.wagon &&
+			} else if (gdvp.wagon != nullptr && gdvp.head != gdvp.wagon &&
 					gdvp.wagon->index != this->sel &&
 					gdvp.wagon->Previous()->index != this->sel) { // ..over an existing wagon.
 				new_vehicle_over = gdvp.wagon->index;
@@ -995,7 +995,7 @@ struct DepotWindow : Window {
 	{
 		switch (widget) {
 			case WID_D_MATRIX: {
-				const Vehicle *v = NULL;
+				const Vehicle *v = nullptr;
 				VehicleID sel = this->sel;
 
 				this->sel = INVALID_VEHICLE;
@@ -1003,20 +1003,20 @@ struct DepotWindow : Window {
 
 				NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_D_MATRIX);
 				if (this->type == VEH_TRAIN) {
-					GetDepotVehiclePtData gdvp = { NULL, NULL };
+					GetDepotVehiclePtData gdvp = { nullptr, nullptr };
 
 					if (this->GetVehicleFromDepotWndPt(pt.x - nwi->pos_x, pt.y - nwi->pos_y, &v, &gdvp) == MODE_DRAG_VEHICLE && sel != INVALID_VEHICLE) {
-						if (gdvp.wagon != NULL && gdvp.wagon->index == sel && _ctrl_pressed) {
+						if (gdvp.wagon != nullptr && gdvp.wagon->index == sel && _ctrl_pressed) {
 							DoCommandP(Vehicle::Get(sel)->tile, Vehicle::Get(sel)->index, true,
 									CMD_REVERSE_TRAIN_DIRECTION | CMD_MSG(STR_ERROR_CAN_T_REVERSE_DIRECTION_RAIL_VEHICLE));
-						} else if (gdvp.wagon == NULL || gdvp.wagon->index != sel) {
+						} else if (gdvp.wagon == nullptr || gdvp.wagon->index != sel) {
 							this->vehicle_over = INVALID_VEHICLE;
 							TrainDepotMoveVehicle(gdvp.wagon, sel, gdvp.head);
-						} else if (gdvp.head != NULL && gdvp.head->IsFrontEngine()) {
+						} else if (gdvp.head != nullptr && gdvp.head->IsFrontEngine()) {
 							ShowVehicleViewWindow(gdvp.head);
 						}
 					}
-				} else if (this->GetVehicleFromDepotWndPt(pt.x - nwi->pos_x, pt.y - nwi->pos_y, &v, NULL) == MODE_DRAG_VEHICLE && v != NULL && sel == v->index) {
+				} else if (this->GetVehicleFromDepotWndPt(pt.x - nwi->pos_x, pt.y - nwi->pos_y, &v, nullptr) == MODE_DRAG_VEHICLE && v != nullptr && sel == v->index) {
 					ShowVehicleViewWindow(v);
 				}
 				break;
@@ -1052,7 +1052,7 @@ struct DepotWindow : Window {
 			this->RaiseWidget(WID_D_SELL);
 			this->SetWidgetDirty(WID_D_SELL);
 		}
-		if (this->nested_array[WID_D_SELL] != NULL && !this->IsWidgetDisabled(WID_D_SELL_CHAIN)) {
+		if (this->nested_array[WID_D_SELL] != nullptr && !this->IsWidgetDisabled(WID_D_SELL_CHAIN)) {
 			this->RaiseWidget(WID_D_SELL_CHAIN);
 			this->SetWidgetDirty(WID_D_SELL_CHAIN);
 		}
@@ -1098,7 +1098,7 @@ static void DepotSellAllConfirmationCallback(Window *win, bool confirmed)
  */
 void ShowDepotWindow(TileIndex tile, VehicleType type)
 {
-	if (BringWindowToFrontById(WC_VEHICLE_DEPOT, tile) != NULL) return;
+	if (BringWindowToFrontById(WC_VEHICLE_DEPOT, tile) != nullptr) return;
 
 	WindowDesc *desc;
 	switch (type) {
@@ -1126,7 +1126,7 @@ void DeleteDepotHighlightOfVehicle(const Vehicle *v)
 	if (_special_mouse_mode != WSM_DRAGDROP) return;
 
 	w = dynamic_cast<DepotWindow*>(FindWindowById(WC_VEHICLE_DEPOT, v->tile));
-	if (w != NULL) {
+	if (w != nullptr) {
 		if (w->sel == v->index) ResetObjectToPlace();
 	}
 }