Codechange: Add missing override specifiers.

src/aircraft.h

@@ -89,28 +89,28 @@ struct Aircraft FINAL : public SpecializedVehicle<Aircraft, VEH_AIRCRAFT> {
 	/** We want to 'destruct' the right class. */
 	virtual ~Aircraft() { this->PreDestructor(); }
 
-	void MarkDirty();
+	void MarkDirty() override;
-	void UpdateDeltaXY();
+	void UpdateDeltaXY() override;
-	ExpensesType GetExpenseType(bool income) const { return income ? EXPENSES_AIRCRAFT_REVENUE : EXPENSES_AIRCRAFT_RUN; }
+	ExpensesType GetExpenseType(bool income) const override { return income ? EXPENSES_AIRCRAFT_REVENUE : EXPENSES_AIRCRAFT_RUN; }
-	bool IsPrimaryVehicle() const                  { return this->IsNormalAircraft(); }
+	bool IsPrimaryVehicle() const override                  { return this->IsNormalAircraft(); }
-	void GetImage(Direction direction, EngineImageType image_type, VehicleSpriteSeq *result) const;
+	void GetImage(Direction direction, EngineImageType image_type, VehicleSpriteSeq *result) const override;
-	int GetDisplaySpeed() const    { return this->cur_speed; }
+	int GetDisplaySpeed() const override    { return this->cur_speed; }
-	int GetDisplayMaxSpeed() const { return this->vcache.cached_max_speed; }
+	int GetDisplayMaxSpeed() const override { return this->vcache.cached_max_speed; }
-	int GetSpeedOldUnits() const   { return this->vcache.cached_max_speed * 10 / 128; }
+	int GetSpeedOldUnits() const            { return this->vcache.cached_max_speed * 10 / 128; }
-	int GetCurrentMaxSpeed() const { return this->GetSpeedOldUnits(); }
+	int GetCurrentMaxSpeed() const override { return this->GetSpeedOldUnits(); }
-	Money GetRunningCost() const;
+	Money GetRunningCost() const override;
 
-	bool IsInDepot() const
+	bool IsInDepot() const override
 	{
 		assert(this->IsPrimaryVehicle());
 		return (this->vehstatus & VS_HIDDEN) != 0 && IsHangarTile(this->tile);
 	}
 
-	bool Tick();
+	bool Tick() override;
-	void OnNewDay();
+	void OnNewDay() override;
-	uint Crash(bool flooded = false);
+	uint Crash(bool flooded = false) override;
-	TileIndex GetOrderStationLocation(StationID station);
+	TileIndex GetOrderStationLocation(StationID station) override;
-	ClosestDepot FindClosestDepot();
+	ClosestDepot FindClosestDepot() override;
 
 	/**
 	 * Check if the aircraft type is a normal flying device; eg

src/bitmap_type.h

@@ -116,7 +116,7 @@ public:
 		if (!this->bitmap->HasTile(TileIndex(this->tile))) ++(*this);
 	}
 
-	inline TileIterator& operator ++()
+	inline TileIterator& operator ++() override
 	{
 		(*this).OrthogonalTileIterator::operator++();
 		while (this->tile != INVALID_TILE && !this->bitmap->HasTile(TileIndex(this->tile))) {
@@ -125,7 +125,7 @@ public:
 		return *this;
 	}
 
-	virtual std::unique_ptr<TileIterator> Clone() const
+	std::unique_ptr<TileIterator> Clone() const override
 	{
 		return std::make_unique<BitmapTileIterator>(*this);
 	}

src/console_cmds.cpp

@@ -1862,17 +1862,17 @@ static ContentType StringToContentType(const char *str)
 
 /** Asynchronous callback */
 struct ConsoleContentCallback : public ContentCallback {
-	void OnConnect(bool success)
+	void OnConnect(bool success) override
 	{
 		IConsolePrint(CC_DEFAULT, "Content server connection {}.", success ? "established" : "failed");
 	}
 
-	void OnDisconnect()
+	void OnDisconnect() override
 	{
 		IConsolePrint(CC_DEFAULT, "Content server connection closed.");
 	}
 
-	void OnDownloadComplete(ContentID cid)
+	void OnDownloadComplete(ContentID cid) override
 	{
 		IConsolePrint(CC_DEFAULT, "Completed download of {}.", cid);
 	}

src/core/pool_type.hpp

@@ -97,7 +97,7 @@ struct Pool : PoolBase {
 	Titem **data;        ///< Pointer to array of pointers to Titem
 
 	Pool(const char *name);
-	virtual void CleanPool();
+	void CleanPool() override;
 
 	/**
 	 * Returns Titem with given index

src/disaster_vehicle.h

@@ -47,9 +47,9 @@ struct DisasterVehicle FINAL : public SpecializedVehicle<DisasterVehicle, VEH_DI
 	virtual ~DisasterVehicle() = default;
 
 	void UpdatePosition(int x, int y, int z);
-	void UpdateDeltaXY();
+	void UpdateDeltaXY() override;
 	void UpdateImage();
-	bool Tick();
+	bool Tick() override;
 };
 
 #endif /* DISASTER_VEHICLE_H */

src/effectvehicle_base.h

@@ -30,8 +30,8 @@ struct EffectVehicle FINAL : public SpecializedVehicle<EffectVehicle, VEH_EFFECT
 	/** We want to 'destruct' the right class. */
 	virtual ~EffectVehicle() = default;
 
-	void UpdateDeltaXY();
+	void UpdateDeltaXY() override;
-	bool Tick();
+	bool Tick() override;
 	TransparencyOption GetTransparencyOption() const;
 };
 

src/game/game_text.cpp

@@ -121,22 +121,22 @@ struct TranslationWriter : LanguageWriter {
 	{
 	}
 
-	void WriteHeader(const LanguagePackHeader *)
+	void WriteHeader(const LanguagePackHeader *) override
 	{
 		/* We don't use the header. */
 	}
 
-	void Finalise()
+	void Finalise() override
 	{
 		/* Nothing to do. */
 	}
 
-	void WriteLength(uint)
+	void WriteLength(uint) override
 	{
 		/* We don't write the length. */
 	}
 
-	void Write(const byte *buffer, size_t length)
+	void Write(const byte *buffer, size_t length) override
 	{
 		this->strings.emplace_back((const char *)buffer, length);
 	}
@@ -154,12 +154,12 @@ struct StringNameWriter : HeaderWriter {
 	{
 	}
 
-	void WriteStringID(const std::string &name, int stringid)
+	void WriteStringID(const std::string &name, int stringid) override
 	{
 		if (stringid == (int)this->strings.size()) this->strings.emplace_back(name);
 	}
 
-	void Finalise(const StringData &)
+	void Finalise(const StringData &) override
 	{
 		/* Nothing to do. */
 	}

src/ini_type.h

@@ -90,8 +90,8 @@ struct IniFile : IniLoadFile {
 
 	bool SaveToDisk(const std::string &filename);
 
-	virtual FILE *OpenFile(const std::string &filename, Subdirectory subdir, size_t *size);
+	FILE *OpenFile(const std::string &filename, Subdirectory subdir, size_t *size) override;
-	virtual void ReportFileError(const char * const pre, const char * const buffer, const char * const post);
+	void ReportFileError(const char * const pre, const char * const buffer, const char * const post) override;
 };
 
 #endif /* INI_TYPE_H */

src/linkgraph/demands.h

@@ -32,7 +32,7 @@ public:
 	 * Call the demand calculator on the given component.
 	 * @param job Component to calculate the demands for.
 	 */
-	virtual void Run(LinkGraphJob &job) const { DemandCalculator c(job); }
+	void Run(LinkGraphJob &job) const override { DemandCalculator c(job); }
 
 	/**
 	 * Virtual destructor has to be defined because of virtual Run().

src/linkgraph/flowmapper.h

@@ -28,7 +28,7 @@ public:
 	 *              values. Only do that on the very last flow mapping.
 	 */
 	FlowMapper(bool scale) : scale(scale) {}
-	virtual void Run(LinkGraphJob &job) const;
+	void Run(LinkGraphJob &job) const override;
 
 private:
 

src/linkgraph/init.h

@@ -16,7 +16,7 @@ public:
 	 * Initialize the link graph job.
 	 * @param job Job to be initialized.
 	 */
-	virtual void Run(LinkGraphJob &job) const { job.Init(); }
+	void Run(LinkGraphJob &job) const override { job.Init(); }
 };
 
 #endif /* INIT_H */

src/linkgraph/mcf.h

@@ -80,7 +80,7 @@ public:
 	 * Run the calculation.
 	 * @param graph Component to be calculated.
 	 */
-	virtual void Run(LinkGraphJob &job) const { Tpass pass(job); }
+	void Run(LinkGraphJob &job) const override { Tpass pass(job); }
 };
 
 #endif /* MCF_H */

src/network/network_server.h

@@ -75,7 +75,7 @@ public:
 	ServerNetworkGameSocketHandler(SOCKET s);
 	~ServerNetworkGameSocketHandler();
 
-	virtual Packet *ReceivePacket() override;
+	Packet *ReceivePacket() override;
 	NetworkRecvStatus CloseConnection(NetworkRecvStatus status) override;
 	std::string GetClientName() const;
 

src/newgrf_airport.h

@@ -43,7 +43,7 @@ public:
 	{
 	}
 
-	inline TileIterator& operator ++()
+	inline TileIterator& operator ++() override
 	{
 		this->att++;
 		if (this->att->ti.x == -0x80) {
@@ -60,7 +60,7 @@ public:
 		return this->att->gfx;
 	}
 
-	virtual std::unique_ptr<TileIterator> Clone() const
+	std::unique_ptr<TileIterator> Clone() const override
 	{
 		return std::make_unique<AirportTileTableIterator>(*this);
 	}

src/newgrf_commons.h

@@ -246,7 +246,7 @@ public:
 struct IndustryTileSpec;
 class IndustryTileOverrideManager : public OverrideManagerBase {
 protected:
-	virtual bool CheckValidNewID(uint16_t testid) { return testid != 0xFF; }
+	bool CheckValidNewID(uint16_t testid) override { return testid != 0xFF; }
 public:
 	IndustryTileOverrideManager(uint16_t offset, uint16_t maximum, uint16_t invalid) :
 			OverrideManagerBase(offset, maximum, invalid) {}
@@ -266,7 +266,7 @@ public:
 struct AirportTileSpec;
 class AirportTileOverrideManager : public OverrideManagerBase {
 protected:
-	virtual bool CheckValidNewID(uint16_t testid) override { return testid != 0xFF; }
+	bool CheckValidNewID(uint16_t testid) override { return testid != 0xFF; }
 public:
 	AirportTileOverrideManager(uint16_t offset, uint16_t maximum, uint16_t invalid) :
 			OverrideManagerBase(offset, maximum, invalid) {}
@@ -277,7 +277,7 @@ public:
 struct ObjectSpec;
 class ObjectOverrideManager : public OverrideManagerBase {
 protected:
-	virtual bool CheckValidNewID(uint16_t testid) override { return testid != 0xFF; }
+	bool CheckValidNewID(uint16_t testid) override { return testid != 0xFF; }
 public:
 	ObjectOverrideManager(uint16_t offset, uint16_t maximum, uint16_t invalid) :
 			OverrideManagerBase(offset, maximum, invalid) {}

src/newgrf_roadtype.h

@@ -32,8 +32,8 @@ struct RoadTypeScopeResolver : public ScopeResolver {
 	{
 	}
 
-	/* virtual */ uint32_t GetRandomBits() const;
+	uint32_t GetRandomBits() const override;
-	/* virtual */ uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
 };
 
 /** Resolver object for road types. */

src/newgrf_spritegroup.h

@@ -90,7 +90,7 @@ struct RealSpriteGroup : SpriteGroup {
 	std::vector<const SpriteGroup *> loading; ///< List of loading groups (can be SpriteIDs or Callback results)
 
 protected:
-	const SpriteGroup *Resolve(ResolverObject &object) const;
+	const SpriteGroup *Resolve(ResolverObject &object) const override;
 };
 
 /* Shared by deterministic and random groups. */
@@ -179,7 +179,7 @@ struct DeterministicSpriteGroup : SpriteGroup {
 	const SpriteGroup *error_group; // was first range, before sorting ranges
 
 protected:
-	const SpriteGroup *Resolve(ResolverObject &object) const;
+	const SpriteGroup *Resolve(ResolverObject &object) const override;
 };
 
 enum RandomizedSpriteGroupCompareMode {
@@ -201,7 +201,7 @@ struct RandomizedSpriteGroup : SpriteGroup {
 	std::vector<const SpriteGroup *> groups; ///< Take the group with appropriate index:
 
 protected:
-	const SpriteGroup *Resolve(ResolverObject &object) const;
+	const SpriteGroup *Resolve(ResolverObject &object) const override;
 };
 
 
@@ -227,7 +227,7 @@ struct CallbackResultSpriteGroup : SpriteGroup {
 	}
 
 	uint16_t result;
-	uint16_t GetCallbackResult() const { return this->result; }
+	uint16_t GetCallbackResult() const override { return this->result; }
 };
 
 
@@ -249,8 +249,8 @@ struct ResultSpriteGroup : SpriteGroup {
 
 	SpriteID sprite;
 	byte num_sprites;
-	SpriteID GetResult() const { return this->sprite; }
+	SpriteID GetResult() const override { return this->sprite; }
-	byte GetNumResults() const { return this->num_sprites; }
+	byte GetNumResults() const override { return this->num_sprites; }
 };
 
 /**

src/newgrf_storage.h

@@ -113,7 +113,7 @@ struct PersistentStorageArray : BasePersistentStorageArray {
 		return this->storage[pos];
 	}
 
-	void ClearChanges()
+	void ClearChanges() override
 	{
 		if (this->prev_storage) {
 			this->storage = *this->prev_storage;

src/newgrf_town.h

@@ -34,8 +34,8 @@ struct TownScopeResolver : public ScopeResolver {
 	{
 	}
 
-	virtual uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const;
+	uint32_t GetVariable(byte variable, [[maybe_unused]] uint32_t parameter, bool *available) const override;
-	virtual void StorePSA(uint reg, int32_t value);
+	void StorePSA(uint reg, int32_t value) override;
 };
 
 /** Resolver of town properties. */

src/openttd.cpp

@@ -399,7 +399,7 @@ struct AfterNewGRFScan : NewGRFScanCallback {
 		static_assert(sizeof(generation_seed) == sizeof(_settings_game.game_creation.generation_seed));
 	}
 
-	virtual void OnNewGRFsScanned()
+	void OnNewGRFsScanned() override
 	{
 		ResetGRFConfig(false);
 

src/saveload/station_sl.cpp

@@ -665,19 +665,19 @@ public:
 	};
 	inline const static SaveLoadCompatTable compat_description = _station_normal_sl_compat;
 
-	void Save(BaseStation *bst) const
+	void Save(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) != 0) return;
 		SlObject(bst, this->GetDescription());
 	}
 
-	void Load(BaseStation *bst) const
+	void Load(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) != 0) return;
 		SlObject(bst, this->GetLoadDescription());
 	}
 
-	void FixPointers(BaseStation *bst) const
+	void FixPointers(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) != 0) return;
 		SlObject(bst, this->GetDescription());
@@ -696,19 +696,19 @@ public:
 	};
 	inline const static SaveLoadCompatTable compat_description = _station_waypoint_sl_compat;
 
-	void Save(BaseStation *bst) const
+	void Save(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) == 0) return;
 		SlObject(bst, this->GetDescription());
 	}
 
-	void Load(BaseStation *bst) const
+	void Load(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) == 0) return;
 		SlObject(bst, this->GetLoadDescription());
 	}
 
-	void FixPointers(BaseStation *bst) const
+	void FixPointers(BaseStation *bst) const override
 	{
 		if ((bst->facilities & FACIL_WAYPOINT) == 0) return;
 		SlObject(bst, this->GetDescription());

src/script/api/script_asyncmode.hpp

@@ -57,7 +57,7 @@ public:
 	/**
 	 * @api -all
 	 */
-	virtual void FinalRelease();
+	void FinalRelease() override;
 };
 
 #endif /* SCRIPT_ASYNCMODE_HPP */

src/script/api/script_execmode.hpp

@@ -48,7 +48,7 @@ public:
 	/**
 	 * @api -all
 	 */
-	virtual void FinalRelease();
+	void FinalRelease() override;
 };
 
 #endif /* SCRIPT_EXECMODE_HPP */

src/script/api/script_list.cpp

@@ -90,7 +90,7 @@ public:
 		this->End();
 	}
 
-	SQInteger Begin()
+	SQInteger Begin() override
 	{
 		if (this->list->buckets.empty()) return 0;
 		this->has_no_more_items = false;
@@ -105,7 +105,7 @@ public:
 		return item_current;
 	}
 
-	void End()
+	void End() override
 	{
 		this->bucket_list = nullptr;
 		this->has_no_more_items = true;
@@ -135,7 +135,7 @@ public:
 		this->item_next = *this->bucket_list_iter;
 	}
 
-	SQInteger Next()
+	SQInteger Next() override
 	{
 		if (this->IsEnd()) return 0;
 
@@ -144,7 +144,7 @@ public:
 		return item_current;
 	}
 
-	void Remove(SQInteger item)
+	void Remove(SQInteger item) override
 	{
 		if (this->IsEnd()) return;
 
@@ -179,7 +179,7 @@ public:
 		this->End();
 	}
 
-	SQInteger Begin()
+	SQInteger Begin() override
 	{
 		if (this->list->buckets.empty()) return 0;
 		this->has_no_more_items = false;
@@ -199,7 +199,7 @@ public:
 		return item_current;
 	}
 
-	void End()
+	void End() override
 	{
 		this->bucket_list = nullptr;
 		this->has_no_more_items = true;
@@ -232,7 +232,7 @@ public:
 		this->item_next = *this->bucket_list_iter;
 	}
 
-	SQInteger Next()
+	SQInteger Next() override
 	{
 		if (this->IsEnd()) return 0;
 
@@ -241,7 +241,7 @@ public:
 		return item_current;
 	}
 
-	void Remove(SQInteger item)
+	void Remove(SQInteger item) override
 	{
 		if (this->IsEnd()) return;
 
@@ -271,7 +271,7 @@ public:
 		this->End();
 	}
 
-	SQInteger Begin()
+	SQInteger Begin() override
 	{
 		if (this->list->items.empty()) return 0;
 		this->has_no_more_items = false;
@@ -284,7 +284,7 @@ public:
 		return item_current;
 	}
 
-	void End()
+	void End() override
 	{
 		this->has_no_more_items = true;
 	}
@@ -302,7 +302,7 @@ public:
 		if (this->item_iter != this->list->items.end()) item_next = (*this->item_iter).first;
 	}
 
-	SQInteger Next()
+	SQInteger Next() override
 	{
 		if (this->IsEnd()) return 0;
 
@@ -311,7 +311,7 @@ public:
 		return item_current;
 	}
 
-	void Remove(SQInteger item)
+	void Remove(SQInteger item) override
 	{
 		if (this->IsEnd()) return;
 
@@ -344,7 +344,7 @@ public:
 		this->End();
 	}
 
-	SQInteger Begin()
+	SQInteger Begin() override
 	{
 		if (this->list->items.empty()) return 0;
 		this->has_no_more_items = false;
@@ -358,7 +358,7 @@ public:
 		return item_current;
 	}
 
-	void End()
+	void End() override
 	{
 		this->has_no_more_items = true;
 	}
@@ -381,7 +381,7 @@ public:
 		if (this->item_iter != this->list->items.end()) item_next = (*this->item_iter).first;
 	}
 
-	SQInteger Next()
+	SQInteger Next() override
 	{
 		if (this->IsEnd()) return 0;
 
@@ -390,7 +390,7 @@ public:
 		return item_current;
 	}
 
-	void Remove(SQInteger item)
+	void Remove(SQInteger item) override
 	{
 		if (this->IsEnd()) return;
 

src/script/api/script_testmode.hpp

@@ -50,7 +50,7 @@ public:
 	/**
 	 * @api -all
 	 */
-	virtual void FinalRelease();
+	void FinalRelease() override;
 };
 
 #endif /* SCRIPT_TESTMODE_HPP */

src/script/api/script_text.hpp

@@ -125,7 +125,7 @@ public:
 	/**
 	 * @api -all
 	 */
-	virtual std::string GetEncodedText();
+	std::string GetEncodedText() override;
 
 private:
 	using ScriptTextRef = ScriptObjectRef<ScriptText>;

src/settings_gui.cpp

@@ -1016,11 +1016,11 @@ struct SettingEntry : BaseSettingEntry {
 
 	SettingEntry(const char *name);
 
-	virtual void Init(byte level = 0);
+	void Init(byte level = 0) override;
-	virtual void ResetAll();
+	void ResetAll() override;
-	virtual uint Length() const;
+	uint Length() const override;
-	virtual uint GetMaxHelpHeight(int maxw);
+	uint GetMaxHelpHeight(int maxw) override;
-	virtual bool UpdateFilterState(SettingFilter &filter, bool force_visible);
+	bool UpdateFilterState(SettingFilter &filter, bool force_visible) override;
 
 	void SetButtons(byte new_val);
 
@@ -1036,7 +1036,7 @@ struct SettingEntry : BaseSettingEntry {
 	void SetValueDParams(uint first_param, int32_t value) const;
 
 protected:
-	virtual void DrawSetting(GameSettings *settings_ptr, int left, int right, int y, bool highlight) const;
+	void DrawSetting(GameSettings *settings_ptr, int left, int right, int y, bool highlight) const override;
 
 private:
 	bool IsVisibleByRestrictionMode(RestrictionMode mode) const;
@@ -1077,23 +1077,23 @@ struct SettingsPage : BaseSettingEntry, SettingsContainer {
 
 	SettingsPage(StringID title);
 
-	virtual void Init(byte level = 0);
+	void Init(byte level = 0) override;
-	virtual void ResetAll();
+	void ResetAll() override;
-	virtual void FoldAll();
+	void FoldAll() override;
-	virtual void UnFoldAll();
+	void UnFoldAll() override;
 
-	virtual uint Length() const;
+	uint Length() const override;
-	virtual void GetFoldingState(bool &all_folded, bool &all_unfolded) const;
+	void GetFoldingState(bool &all_folded, bool &all_unfolded) const override;
-	virtual bool IsVisible(const BaseSettingEntry *item) const;
+	bool IsVisible(const BaseSettingEntry *item) const override;
-	virtual BaseSettingEntry *FindEntry(uint row, uint *cur_row);
+	BaseSettingEntry *FindEntry(uint row, uint *cur_row) override;
-	virtual uint GetMaxHelpHeight(int maxw) { return SettingsContainer::GetMaxHelpHeight(maxw); }
+	uint GetMaxHelpHeight(int maxw) override { return SettingsContainer::GetMaxHelpHeight(maxw); }
 
-	virtual bool UpdateFilterState(SettingFilter &filter, bool force_visible);
+	bool UpdateFilterState(SettingFilter &filter, bool force_visible) override;
 
-	virtual uint Draw(GameSettings *settings_ptr, int left, int right, int y, uint first_row, uint max_row, BaseSettingEntry *selected, uint cur_row = 0, uint parent_last = 0) const;
+	uint Draw(GameSettings *settings_ptr, int left, int right, int y, uint first_row, uint max_row, BaseSettingEntry *selected, uint cur_row = 0, uint parent_last = 0) const override;
 
 protected:
-	virtual void DrawSetting(GameSettings *settings_ptr, int left, int right, int y, bool highlight) const;
+	void DrawSetting(GameSettings *settings_ptr, int left, int right, int y, bool highlight) const override;
 };
 
 /* == BaseSettingEntry methods == */

src/settingsgen/settingsgen.cpp

@@ -159,7 +159,7 @@ struct SettingsIniFile : IniLoadFile {
 	{
 	}
 
-	virtual FILE *OpenFile(const std::string &filename, Subdirectory, size_t *size)
+	FILE *OpenFile(const std::string &filename, Subdirectory, size_t *size) override
 	{
 		/* Open the text file in binary mode to prevent end-of-line translations
 		 * done by ftell() and friends, as defined by K&R. */
@@ -173,7 +173,7 @@ struct SettingsIniFile : IniLoadFile {
 		return in;
 	}
 
-	virtual void ReportFileError(const char * const pre, const char * const buffer, const char * const post)
+	void ReportFileError(const char * const pre, const char * const buffer, const char * const post) override
 	{
 		FatalError("{}{}{}", pre, buffer, post);
 	}

src/sound/allegro_s.h

@@ -15,19 +15,19 @@
 /** Implementation of the allegro sound driver. */
 class SoundDriver_Allegro : public SoundDriver {
 public:
-	const char *Start(const StringList &param);
+	const char *Start(const StringList &param) override;
 
-	void Stop();
+	void Stop() override;
 
-	void MainLoop();
+	void MainLoop() override;
-	const char *GetName() const { return "allegro"; }
+	const char *GetName() const override { return "allegro"; }
 };
 
 /** Factory for the allegro sound driver. */
 class FSoundDriver_Allegro : public DriverFactoryBase {
 public:
 	FSoundDriver_Allegro() : DriverFactoryBase(Driver::DT_SOUND, 4, "allegro", "Allegro Sound Driver (param hz,samples)") {}
-	/* virtual */ Driver *CreateInstance() const { return new SoundDriver_Allegro(); }
+	Driver *CreateInstance() const override { return new SoundDriver_Allegro(); }
 };
 
 #endif /* SOUND_ALLEGRO_H */

src/spriteloader/grf.hpp

@@ -17,7 +17,7 @@ class SpriteLoaderGrf : public SpriteLoader {
 	byte container_ver;
 public:
 	SpriteLoaderGrf(byte container_ver) : container_ver(container_ver) {}
-	uint8_t LoadSprite(SpriteLoader::Sprite *sprite, SpriteFile &file, size_t file_pos, SpriteType sprite_type, bool load_32bpp, byte control_flags);
+	uint8_t LoadSprite(SpriteLoader::Sprite *sprite, SpriteFile &file, size_t file_pos, SpriteType sprite_type, bool load_32bpp, byte control_flags) override;
 };
 
 #endif /* SPRITELOADER_GRF_HPP */

src/station_base.h

@@ -538,7 +538,7 @@ public:
 		if (!st->TileBelongsToAirport(this->tile)) ++(*this);
 	}
 
-	inline TileIterator& operator ++()
+	inline TileIterator& operator ++() override
 	{
 		(*this).OrthogonalTileIterator::operator++();
 		while (this->tile != INVALID_TILE && !st->TileBelongsToAirport(this->tile)) {
@@ -547,7 +547,7 @@ public:
 		return *this;
 	}
 
-	virtual std::unique_ptr<TileIterator> Clone() const
+	std::unique_ptr<TileIterator> Clone() const override
 	{
 		return std::make_unique<AirportTileIterator>(*this);
 	}

src/strgen/strgen.cpp

@@ -238,7 +238,7 @@ struct HeaderFileWriter : HeaderWriter, FileWriter {
 		this->output_stream << "#define TABLE_STRINGS_H\n";
 	}
 
-	void WriteStringID(const std::string &name, int stringid)
+	void WriteStringID(const std::string &name, int stringid) override
 	{
 		if (prev + 1 != stringid) this->output_stream << "\n";
 		fmt::print(this->output_stream, "static const StringID {} = 0x{:X};\n", name, stringid);
@@ -246,7 +246,7 @@ struct HeaderFileWriter : HeaderWriter, FileWriter {
 		total_strings++;
 	}
 
-	void Finalise(const StringData &data)
+	void Finalise(const StringData &data) override
 	{
 		/* Find the plural form with the most amount of cases. */
 		int max_plural_forms = 0;
@@ -293,18 +293,18 @@ struct LanguageFileWriter : LanguageWriter, FileWriter {
 	{
 	}
 
-	void WriteHeader(const LanguagePackHeader *header)
+	void WriteHeader(const LanguagePackHeader *header) override
 	{
 		this->Write((const byte *)header, sizeof(*header));
 	}
 
-	void Finalise()
+	void Finalise() override
 	{
 		this->output_stream.put(0);
 		this->FileWriter::Finalise();
 	}
 
-	void Write(const byte *buffer, size_t length)
+	void Write(const byte *buffer, size_t length) override
 	{
 		this->output_stream.write((const char *)buffer, length);
 	}

src/string.cpp

@@ -812,14 +812,14 @@ public:
 	{
 	}
 
-	virtual void SetString(const char *s)
+	void SetString(const char *s) override
 	{
 		this->string = s;
 		this->len = strlen(s);
 		this->cur_pos = 0;
 	}
 
-	virtual size_t SetCurPosition(size_t pos)
+	size_t SetCurPosition(size_t pos) override
 	{
 		assert(this->string != nullptr && pos <= this->len);
 		/* Sanitize in case we get a position inside an UTF-8 sequence. */
@@ -827,7 +827,7 @@ public:
 		return this->cur_pos = pos;
 	}
 
-	virtual size_t Next(IterType what)
+	size_t Next(IterType what) override
 	{
 		assert(this->string != nullptr);
 
@@ -865,7 +865,7 @@ public:
 		return END;
 	}
 
-	virtual size_t Prev(IterType what)
+	size_t Prev(IterType what) override
 	{
 		assert(this->string != nullptr);
 

src/tilearea_type.h

@@ -210,7 +210,7 @@ public:
 	/**
 	 * Move ourselves to the next tile in the rectangle on the map.
 	 */
-	inline TileIterator& operator ++()
+	inline TileIterator& operator ++() override
 	{
 		assert(this->tile != INVALID_TILE);
 
@@ -225,7 +225,7 @@ public:
 		return *this;
 	}
 
-	virtual std::unique_ptr<TileIterator> Clone() const
+	std::unique_ptr<TileIterator> Clone() const override
 	{
 		return std::make_unique<OrthogonalTileIterator>(*this);
 	}
@@ -262,9 +262,9 @@ public:
 		*this = DiagonalTileIterator(DiagonalTileArea(corner1, corner2));
 	}
 
-	TileIterator& operator ++();
+	TileIterator& operator ++() override;
 
-	virtual std::unique_ptr<TileIterator> Clone() const
+	std::unique_ptr<TileIterator> Clone() const override
 	{
 		return std::make_unique<DiagonalTileIterator>(*this);
 	}