Codechange: Use null pointer literal instead of the NULL macro

1 files changed, 30 insertions, 30 deletions

diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
index e3d307dc9..54aaf61f6 100644
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -78,9 +78,9 @@ static void ShowSignalBuilder(Window *parent);
  */
 static bool IsStationAvailable(const StationSpec *statspec)
 {
-	if (statspec == NULL || !HasBit(statspec->callback_mask, CBM_STATION_AVAIL)) return true;
+	if (statspec == nullptr || !HasBit(statspec->callback_mask, CBM_STATION_AVAIL)) return true;
 
-	uint16 cb_res = GetStationCallback(CBID_STATION_AVAILABILITY, 0, 0, statspec, NULL, INVALID_TILE);
+	uint16 cb_res = GetStationCallback(CBID_STATION_AVAILABILITY, 0, 0, statspec, nullptr, INVALID_TILE);
 	if (cb_res == CALLBACK_FAILED) return true;
 
 	return Convert8bitBooleanCallback(statspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res);
@@ -234,7 +234,7 @@ static void GenericPlaceSignals(TileIndex tile)
 		/* various bitstuffed elements for CmdBuildSingleSignal() */
 		uint32 p1 = track;
 
-		if (w != NULL) {
+		if (w != nullptr) {
 			/* signal GUI is used */
 			SB(p1, 3, 1, _ctrl_pressed);
 			SB(p1, 4, 1, _cur_signal_variant);
@@ -250,7 +250,7 @@ static void GenericPlaceSignals(TileIndex tile)
 		}
 
 		DoCommandP(tile, p1, 0, CMD_BUILD_SIGNALS |
-				CMD_MSG((w != NULL && _convert_signal_button) ? STR_ERROR_SIGNAL_CAN_T_CONVERT_SIGNALS_HERE : STR_ERROR_CAN_T_BUILD_SIGNALS_HERE),
+				CMD_MSG((w != nullptr && _convert_signal_button) ? STR_ERROR_SIGNAL_CAN_T_CONVERT_SIGNALS_HERE : STR_ERROR_CAN_T_BUILD_SIGNALS_HERE),
 				CcPlaySound_SPLAT_RAIL);
 	}
 }
@@ -388,7 +388,7 @@ static void HandleAutoSignalPlacement()
 
 	const Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
 
-	if (w != NULL) {
+	if (w != nullptr) {
 		/* signal GUI is used */
 		SB(p2,  3, 1, 0);
 		SB(p2,  4, 1, _cur_signal_variant);
@@ -683,7 +683,7 @@ struct BuildRailToolbarWindow : Window {
 	void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) override
 	{
 		/* no dragging if you have pressed the convert button */
-		if (FindWindowById(WC_BUILD_SIGNAL, 0) != NULL && _convert_signal_button && this->IsWidgetLowered(WID_RAT_BUILD_SIGNALS)) return;
+		if (FindWindowById(WC_BUILD_SIGNAL, 0) != nullptr && _convert_signal_button && this->IsWidgetLowered(WID_RAT_BUILD_SIGNALS)) return;
 
 		VpSelectTilesWithMethod(pt.x, pt.y, select_method);
 	}
@@ -781,7 +781,7 @@ static EventState RailToolbarGlobalHotkeys(int hotkey)
 	if (_game_mode != GM_NORMAL || !CanBuildVehicleInfrastructure(VEH_TRAIN)) return ES_NOT_HANDLED;
 	extern RailType _last_built_railtype;
 	Window *w = ShowBuildRailToolbar(_last_built_railtype);
-	if (w == NULL) return ES_NOT_HANDLED;
+	if (w == nullptr) return ES_NOT_HANDLED;
 	return w->OnHotkey(hotkey);
 }
 
@@ -862,12 +862,12 @@ static WindowDesc _build_rail_desc(
  * If the terraform toolbar is linked to the toolbar, that window is also opened.
  *
  * @param railtype Rail type to open the window for
- * @return newly opened rail toolbar, or NULL if the toolbar could not be opened.
+ * @return newly opened rail toolbar, or nullptr if the toolbar could not be opened.
  */
 Window *ShowBuildRailToolbar(RailType railtype)
 {
-	if (!Company::IsValidID(_local_company)) return NULL;
-	if (!ValParamRailtype(railtype)) return NULL;
+	if (!Company::IsValidID(_local_company)) return nullptr;
+	if (!ValParamRailtype(railtype)) return nullptr;
 
 	DeleteWindowByClass(WC_BUILD_TOOLBAR);
 	_cur_railtype = railtype;
@@ -907,7 +907,7 @@ private:
 	 */
 	void CheckSelectedSize(const StationSpec *statspec)
 	{
-		if (statspec == NULL || _settings_client.gui.station_dragdrop) return;
+		if (statspec == nullptr || _settings_client.gui.station_dragdrop) return;
 
 		/* If current number of tracks is not allowed, make it as big as possible */
 		if (HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
@@ -937,7 +937,7 @@ public:
 	BuildRailStationWindow(WindowDesc *desc, Window *parent, bool newstation) : PickerWindowBase(desc, parent)
 	{
 		this->coverage_height = 2 * FONT_HEIGHT_NORMAL + 3 * WD_PAR_VSEP_NORMAL;
-		this->vscroll = NULL;
+		this->vscroll = nullptr;
 		_railstation.newstations = newstation;
 
 		this->CreateNestedTree();
@@ -970,7 +970,7 @@ public:
 			 * type is 'selected'. */
 			_railstation.station_class = STAT_CLASS_DFLT;
 			_railstation.station_type = 0;
-			this->vscroll2 = NULL;
+			this->vscroll2 = nullptr;
 		}
 		if (newstation) {
 			_railstation.station_count = StationClass::Get(_railstation.station_class)->GetSpecCount();
@@ -999,7 +999,7 @@ public:
 	void OnPaint() override
 	{
 		bool newstations = _railstation.newstations;
-		const StationSpec *statspec = newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
+		const StationSpec *statspec = newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
 
 		if (_settings_client.gui.station_dragdrop) {
 			SetTileSelectSize(1, 1);
@@ -1018,7 +1018,7 @@ public:
 
 		for (uint bits = 0; bits < 7; bits++) {
 			bool disable = bits >= _settings_game.station.station_spread;
-			if (statspec == NULL) {
+			if (statspec == nullptr) {
 				this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_NUM_1, disable);
 				this->SetWidgetDisabledState(bits + WID_BRAS_PLATFORM_LEN_1, disable);
 			} else {
@@ -1078,7 +1078,7 @@ public:
 					StationClass *stclass = StationClass::Get(statclass);
 					for (uint16 j = 0; j < stclass->GetSpecCount(); j++) {
 						const StationSpec *statspec = stclass->GetSpec(j);
-						SetDParam(0, (statspec != NULL && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
+						SetDParam(0, (statspec != nullptr && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
 						d = maxdim(d, GetStringBoundingBox(str));
 					}
 				}
@@ -1180,7 +1180,7 @@ public:
 
 	void OnResize() override
 	{
-		if (this->vscroll != NULL) { // New stations available.
+		if (this->vscroll != nullptr) { // New stations available.
 			this->vscroll->SetCapacityFromWidget(this, WID_BRAS_NEWST_LIST);
 		}
 	}
@@ -1189,7 +1189,7 @@ public:
 	{
 		if (widget == WID_BRAS_SHOW_NEWST_TYPE) {
 			const StationSpec *statspec = StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type);
-			SetDParam(0, (statspec != NULL && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
+			SetDParam(0, (statspec != nullptr && statspec->name != 0) ? statspec->name : STR_STATION_CLASS_DFLT);
 		}
 	}
 
@@ -1221,8 +1221,8 @@ public:
 
 				_settings_client.gui.station_dragdrop = false;
 
-				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
-				if (statspec != NULL && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
+				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
+				if (statspec != nullptr && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
 					/* The previously selected number of platforms in invalid */
 					for (uint i = 0; i < 7; i++) {
 						if (!HasBit(statspec->disallowed_lengths, i)) {
@@ -1256,8 +1256,8 @@ public:
 
 				_settings_client.gui.station_dragdrop = false;
 
-				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
-				if (statspec != NULL && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
+				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
+				if (statspec != nullptr && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
 					/* The previously selected number of tracks in invalid */
 					for (uint i = 0; i < 7; i++) {
 						if (!HasBit(statspec->disallowed_platforms, i)) {
@@ -1282,8 +1282,8 @@ public:
 				this->ToggleWidgetLoweredState(WID_BRAS_PLATFORM_DRAG_N_DROP);
 
 				/* get the first allowed length/number of platforms */
-				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : NULL;
-				if (statspec != NULL && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
+				const StationSpec *statspec = _railstation.newstations ? StationClass::Get(_railstation.station_class)->GetSpec(_railstation.station_type) : nullptr;
+				if (statspec != nullptr && HasBit(statspec->disallowed_lengths, _settings_client.gui.station_platlength - 1)) {
 					for (uint i = 0; i < 7; i++) {
 						if (!HasBit(statspec->disallowed_lengths, i)) {
 							this->RaiseWidget(_settings_client.gui.station_platlength + WID_BRAS_PLATFORM_LEN_BEGIN);
@@ -1292,7 +1292,7 @@ public:
 						}
 					}
 				}
-				if (statspec != NULL && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
+				if (statspec != nullptr && HasBit(statspec->disallowed_platforms, _settings_client.gui.station_numtracks - 1)) {
 					for (uint i = 0; i < 7; i++) {
 						if (!HasBit(statspec->disallowed_platforms, i)) {
 							this->RaiseWidget(_settings_client.gui.station_numtracks + WID_BRAS_PLATFORM_NUM_BEGIN);
@@ -1598,7 +1598,7 @@ public:
 				/* If 'remove' button of rail build toolbar is active, disable it. */
 				if (_remove_button_clicked) {
 					Window *w = FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL);
-					if (w != NULL) ToggleRailButton_Remove(w);
+					if (w != nullptr) ToggleRailButton_Remove(w);
 				}
 
 				break;
@@ -1768,7 +1768,7 @@ static const NWidgetPart _nested_build_depot_widgets[] = {
 };
 
 static WindowDesc _build_depot_desc(
-	WDP_AUTO, NULL, 0, 0,
+	WDP_AUTO, nullptr, 0, 0,
 	WC_BUILD_DEPOT, WC_BUILD_TOOLBAR,
 	WDF_CONSTRUCTION,
 	_nested_build_depot_widgets, lengthof(_nested_build_depot_widgets)
@@ -1896,7 +1896,7 @@ void ReinitGuiAfterToggleElrail(bool disable)
 	if (disable && _last_built_railtype == RAILTYPE_ELECTRIC) {
 		_last_built_railtype = _cur_railtype = RAILTYPE_RAIL;
 		BuildRailToolbarWindow *w = dynamic_cast<BuildRailToolbarWindow *>(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
-		if (w != NULL) w->ModifyRailType(_cur_railtype);
+		if (w != nullptr) w->ModifyRailType(_cur_railtype);
 	}
 	MarkWholeScreenDirty();
 }
@@ -1943,7 +1943,7 @@ static void SetDefaultRailGui()
 
 	_last_built_railtype = _cur_railtype = rt;
 	BuildRailToolbarWindow *w = dynamic_cast<BuildRailToolbarWindow *>(FindWindowById(WC_BUILD_TOOLBAR, TRANSPORT_RAIL));
-	if (w != NULL) w->ModifyRailType(_cur_railtype);
+	if (w != nullptr) w->ModifyRailType(_cur_railtype);
 }
 
 /**
@@ -1958,7 +1958,7 @@ bool ResetSignalVariant(int32 p)
 
 	if (new_variant != _cur_signal_variant) {
 		Window *w = FindWindowById(WC_BUILD_SIGNAL, 0);
-		if (w != NULL) {
+		if (w != nullptr) {
 			w->SetDirty();
 			w->RaiseWidget((_cur_signal_variant == SIG_ELECTRIC ? WID_BS_ELECTRIC_NORM : WID_BS_SEMAPHORE_NORM) + _cur_signal_type);
 		}