Modernize various files (src/m*) (#6267)

* Modernize various files (src/m*)

* range-based for loops
* code style
* C++ headers instead of C headers
* Default operators
* empty function

Thanks to clang-tidy

34 files changed, 254 insertions, 355 deletions

diff --git a/src/main.cpp b/src/main.cpp
index ee391cf68..303004f0c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -211,7 +211,7 @@ int main(int argc, char *argv[])
 #endif
 
 	// Update configuration file
-	if (g_settings_path != "")
+	if (!g_settings_path.empty())
 		g_settings->updateConfigFile(g_settings_path.c_str());
 
 	print_modified_quicktune_values();
@@ -306,17 +306,16 @@ static void print_help(const OptionList &allowed_options)
 
 static void print_allowed_options(const OptionList &allowed_options)
 {
-	for (OptionList::const_iterator i = allowed_options.begin();
-			i != allowed_options.end(); ++i) {
+	for (const auto &allowed_option : allowed_options) {
 		std::ostringstream os1(std::ios::binary);
-		os1 << "  --" << i->first;
-		if (i->second.type != VALUETYPE_FLAG)
+		os1 << "  --" << allowed_option.first;
+		if (allowed_option.second.type != VALUETYPE_FLAG)
 			os1 << _(" <value>");
 
 		std::cout << padStringRight(os1.str(), 30);
 
-		if (i->second.help)
-			std::cout << i->second.help;
+		if (allowed_option.second.help)
+			std::cout << allowed_option.second.help;
 
 		std::cout << std::endl;
 	}
@@ -335,9 +334,8 @@ static void print_version()
 static void list_game_ids()
 {
 	std::set<std::string> gameids = getAvailableGameIds();
-	for (std::set<std::string>::const_iterator i = gameids.begin();
-			i != gameids.end(); ++i)
-		std::cout << (*i) <<std::endl;
+	for (const std::string &gameid : gameids)
+		std::cout << gameid <<std::endl;
 }
 
 static void list_worlds()
@@ -350,10 +348,10 @@ static void list_worlds()
 static void print_worldspecs(const std::vector<WorldSpec> &worldspecs,
 							 std::ostream &os)
 {
-	for (size_t i = 0; i < worldspecs.size(); i++) {
-		std::string name = worldspecs[i].name;
-		std::string path = worldspecs[i].path;
-		if (name.find(" ") != std::string::npos)
+	for (const WorldSpec &worldspec : worldspecs) {
+		std::string name = worldspec.name;
+		std::string path = worldspec.path;
+		if (name.find(' ') != std::string::npos)
 			name = std::string("'") + name + "'";
 		path = std::string("'") + path + "'";
 		name = padStringRight(name, 14);
@@ -366,15 +364,15 @@ static void print_modified_quicktune_values()
 	bool header_printed = false;
 	std::vector<std::string> names = getQuicktuneNames();
 
-	for (u32 i = 0; i < names.size(); i++) {
-		QuicktuneValue val = getQuicktuneValue(names[i]);
+	for (const std::string &name : names) {
+		QuicktuneValue val = getQuicktuneValue(name);
 		if (!val.modified)
 			continue;
 		if (!header_printed) {
 			dstream << "Modified quicktune values:" << std::endl;
 			header_printed = true;
 		}
-		dstream << names[i] << " = " << val.getString() << std::endl;
+		dstream << name << " = " << val.getString() << std::endl;
 	}
 }
 
@@ -485,16 +483,16 @@ static bool read_config_file(const Settings &cmd_args)
 				DIR_DELIM + ".." + DIR_DELIM + ".." + DIR_DELIM + "minetest.conf");
 #endif
 
-		for (size_t i = 0; i < filenames.size(); i++) {
-			bool r = g_settings->readConfigFile(filenames[i].c_str());
+		for (const std::string &filename : filenames) {
+			bool r = g_settings->readConfigFile(filename.c_str());
 			if (r) {
-				g_settings_path = filenames[i];
+				g_settings_path = filename;
 				break;
 			}
 		}
 
 		// If no path found, use the first one (menu creates the file)
-		if (g_settings_path == "")
+		if (g_settings_path.empty())
 			g_settings_path = filenames[0];
 	}
 
@@ -540,7 +538,7 @@ static void init_log_streams(const Settings &cmd_args)
 
 	verbosestream << "log_filename = " << log_filename << std::endl;
 
-	file_log_output.open(log_filename.c_str());
+	file_log_output.open(log_filename);
 	g_logger.addOutputMaxLevel(&file_log_output, log_level);
 }
 
@@ -573,6 +571,7 @@ static bool game_configure_world(GameParams *game_params, const Settings &cmd_ar
 {
 	if (get_world_from_cmdline(game_params, cmd_args))
 		return true;
+
 	if (get_world_from_config(game_params, cmd_args))
 		return true;
 
@@ -581,24 +580,24 @@ static bool game_configure_world(GameParams *game_params, const Settings &cmd_ar
 
 static bool get_world_from_cmdline(GameParams *game_params, const Settings &cmd_args)
 {
-	std::string commanded_world = "";
+	std::string commanded_world;
 
 	// World name
-	std::string commanded_worldname = "";
+	std::string commanded_worldname;
 	if (cmd_args.exists("worldname"))
 		commanded_worldname = cmd_args.get("worldname");
 
 	// If a world name was specified, convert it to a path
-	if (commanded_worldname != "") {
+	if (!commanded_worldname.empty()) {
 		// Get information about available worlds
 		std::vector<WorldSpec> worldspecs = getAvailableWorlds();
 		bool found = false;
-		for (u32 i = 0; i < worldspecs.size(); i++) {
-			std::string name = worldspecs[i].name;
+		for (const WorldSpec &worldspec : worldspecs) {
+			std::string name = worldspec.name;
 			if (name == commanded_worldname) {
 				dstream << _("Using world specified by --worldname on the "
 					"command line") << std::endl;
-				commanded_world = worldspecs[i].path;
+				commanded_world = worldspec.path;
 				found = true;
 				break;
 			}
@@ -611,7 +610,7 @@ static bool get_world_from_cmdline(GameParams *game_params, const Settings &cmd_
 		}
 
 		game_params->world_path = get_clean_world_path(commanded_world);
-		return commanded_world != "";
+		return !commanded_world.empty();
 	}
 
 	if (cmd_args.exists("world"))
@@ -622,20 +621,20 @@ static bool get_world_from_cmdline(GameParams *game_params, const Settings &cmd_
 		commanded_world = cmd_args.get("nonopt0");
 
 	game_params->world_path = get_clean_world_path(commanded_world);
-	return commanded_world != "";
+	return !commanded_world.empty();
 }
 
 static bool get_world_from_config(GameParams *game_params, const Settings &cmd_args)
 {
 	// World directory
-	std::string commanded_world = "";
+	std::string commanded_world;
 
 	if (g_settings->exists("map-dir"))
 		commanded_world = g_settings->get("map-dir");
 
 	game_params->world_path = get_clean_world_path(commanded_world);
 
-	return commanded_world != "";
+	return !commanded_world.empty();
 }
 
 static bool auto_select_world(GameParams *game_params)
@@ -729,8 +728,8 @@ static bool determine_subgame(GameParams *game_params)
 
 	verbosestream << _("Determining gameid/gamespec") << std::endl;
 	// If world doesn't exist
-	if (game_params->world_path != ""
-			&& !getWorldExists(game_params->world_path)) {
+	if (!game_params->world_path.empty()
+		&& !getWorldExists(game_params->world_path)) {
 		// Try to take gamespec from command line
 		if (game_params->game_spec.isValid()) {
 			gamespec = game_params->game_spec;
@@ -810,7 +809,8 @@ static bool run_dedicated_server(const GameParams &game_params, const Settings &
 	// Database migration
 	if (cmd_args.exists("migrate"))
 		return migrate_map_database(game_params, cmd_args);
-	else if (cmd_args.exists("migrate-players"))
+
+	if (cmd_args.exists("migrate-players"))
 		return ServerEnvironment::migratePlayersDatabase(game_params, cmd_args);
 
 	if (cmd_args.exists("terminal")) {
diff --git a/src/mainmenumanager.h b/src/mainmenumanager.h
index 2618d3ccf..49bc88dff 100644
--- a/src/mainmenumanager.h
+++ b/src/mainmenumanager.h
@@ -48,11 +48,8 @@ class MainMenuManager : public IMenuManager
 public:
 	virtual void createdMenu(gui::IGUIElement *menu)
 	{
-		for(std::list<gui::IGUIElement*>::iterator
-				i = m_stack.begin();
-				i != m_stack.end(); ++i)
-		{
-			assert(*i != menu);
+		for (gui::IGUIElement *i : m_stack) {
+			assert(i != menu);
 		}
 
 		if(!m_stack.empty())
@@ -103,10 +100,8 @@ public:
 
 	bool pausesGame()
 	{
-		for(std::list<gui::IGUIElement*>::iterator
-				i = m_stack.begin(); i != m_stack.end(); ++i)
-		{
-			GUIModalMenu *mm = dynamic_cast<GUIModalMenu*>(*i);
+		for (gui::IGUIElement *i : m_stack) {
+			GUIModalMenu *mm = dynamic_cast<GUIModalMenu*>(i);
 			if (mm && mm->pausesGame())
 				return true;
 		}
@@ -123,8 +118,8 @@ extern bool isMenuActive();
 class MainGameCallback : public IGameCallback
 {
 public:
-	MainGameCallback() {}
-	virtual ~MainGameCallback() {}
+	MainGameCallback() = default;
+	virtual ~MainGameCallback() = default;
 
 	virtual void exitToOS()
 	{
diff --git a/src/map.cpp b/src/map.cpp
index 972c666e4..6cf838696 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -527,14 +527,13 @@ void Map::unloadUnreferencedBlocks(std::vector<v3s16> *unloaded_blocks)
 
 void Map::deleteSectors(std::vector<v2s16> &sectorList)
 {
-	for(std::vector<v2s16>::iterator j = sectorList.begin();
-		j != sectorList.end(); ++j) {
-		MapSector *sector = m_sectors[*j];
+	for (v2s16 j : sectorList) {
+		MapSector *sector = m_sectors[j];
 		// If sector is in sector cache, remove it from there
 		if(m_sector_cache == sector)
 			m_sector_cache = NULL;
 		// Remove from map and delete
-		m_sectors.erase(*j);
+		m_sectors.erase(j);
 		delete sector;
 	}
 }
@@ -1724,7 +1723,7 @@ MapBlock * ServerMap::emergeBlock(v3s16 p, bool create_blank)
 
 	{
 		MapBlock *block = getBlockNoCreateNoEx(p);
-		if(block && block->isDummy() == false)
+		if (block && !block->isDummy())
 			return block;
 	}
 
@@ -1855,8 +1854,7 @@ bool ServerMap::loadFromFolders() {
 
 void ServerMap::createDirs(std::string path)
 {
-	if(fs::CreateAllDirs(path) == false)
-	{
+	if (!fs::CreateAllDirs(path)) {
 		m_dout<<"ServerMap: Failed to create directory "
 				<<"\""<<path<<"\""<<std::endl;
 		throw BaseException("ServerMap failed to create directory");
@@ -1940,7 +1938,7 @@ std::string ServerMap::getBlockFilename(v3s16 p)
 void ServerMap::save(ModifiedState save_level)
 {
 	DSTACK(FUNCTION_NAME);
-	if(m_map_saving_enabled == false) {
+	if (!m_map_saving_enabled) {
 		warningstream<<"Not saving map, saving disabled."<<std::endl;
 		return;
 	}
@@ -2081,8 +2079,7 @@ MapSector* ServerMap::loadSectorMeta(std::string sectordir, bool save_after_load
 
 	std::string fullpath = sectordir + DIR_DELIM + "meta";
 	std::ifstream is(fullpath.c_str(), std::ios_base::binary);
-	if(is.good() == false)
-	{
+	if (!is.good()) {
 		// If the directory exists anyway, it probably is in some old
 		// format. Just go ahead and create the sector.
 		if(fs::PathExists(sectordir))
@@ -2494,7 +2491,7 @@ MapBlock* ServerMap::loadBlock(v3s16 blockpos)
 		 */
 
 		std::string blockfilename = getBlockFilename(blockpos);
-		if (fs::PathExists(sectordir + DIR_DELIM + blockfilename) == false)
+		if (!fs::PathExists(sectordir + DIR_DELIM + blockfilename))
 			return NULL;
 
 		/*
@@ -2667,8 +2664,8 @@ void MMVManip::blitBackAll(std::map<v3s16, MapBlock*> *modified_blocks,
 		v3s16 p = i->first;
 		MapBlock *block = m_map->getBlockNoCreateNoEx(p);
 		bool existed = !(i->second & VMANIP_BLOCK_DATA_INEXIST);
-		if ((existed == false) || (block == NULL) ||
-			(overwrite_generated == false && block->isGenerated() == true))
+		if (!existed || (block == NULL) ||
+			(!overwrite_generated && block->isGenerated()))
 			continue;
 
 		block->copyFrom(*this);
diff --git a/src/map.h b/src/map.h
index 4dd2b7e30..81f32baea 100644
--- a/src/map.h
+++ b/src/map.h
@@ -77,7 +77,7 @@ struct MapEditEvent
 	std::set<v3s16> modified_blocks;
 	u16 already_known_by_peer = 0;
 
-	MapEditEvent() {}
+	MapEditEvent() = default;
 
 	MapEditEvent * clone()
 	{
@@ -107,11 +107,7 @@ struct MapEditEvent
 		case MEET_OTHER:
 		{
 			VoxelArea a;
-			for(std::set<v3s16>::iterator
-					i = modified_blocks.begin();
-					i != modified_blocks.end(); ++i)
-			{
-				v3s16 p = *i;
+			for (v3s16 p : modified_blocks) {
 				v3s16 np1 = p*MAP_BLOCKSIZE;
 				v3s16 np2 = np1 + v3s16(1,1,1)*MAP_BLOCKSIZE - v3s16(1,1,1);
 				a.addPoint(np1);
@@ -216,8 +212,8 @@ public:
 	bool removeNodeWithEvent(v3s16 p);
 
 	// Call these before and after saving of many blocks
-	virtual void beginSave() { return; }
-	virtual void endSave() { return; }
+	virtual void beginSave() {}
+	virtual void endSave() {}
 
 	virtual void save(ModifiedState save_level) { FATAL_ERROR("FIXME"); }
 
diff --git a/src/mapblock.cpp b/src/mapblock.cpp
index ca5894794..48b7c1915 100644
--- a/src/mapblock.cpp
+++ b/src/mapblock.cpp
@@ -71,7 +71,7 @@ MapBlock::MapBlock(Map *parent, v3s16 pos, IGameDef *gamedef, bool dummy):
 		m_pos_relative(pos * MAP_BLOCKSIZE),
 		m_gamedef(gamedef)
 {
-	if(dummy == false)
+	if (!dummy)
 		reallocate();
 }
 
@@ -89,24 +89,22 @@ MapBlock::~MapBlock()
 
 bool MapBlock::isValidPositionParent(v3s16 p)
 {
-	if(isValidPosition(p))
-	{
+	if (isValidPosition(p)) {
 		return true;
 	}
-	else{
-		return m_parent->isValidPosition(getPosRelative() + p);
-	}
+
+	return m_parent->isValidPosition(getPosRelative() + p);
 }
 
 MapNode MapBlock::getNodeParent(v3s16 p, bool *is_valid_position)
 {
-	if (isValidPosition(p) == false)
+	if (!isValidPosition(p))
 		return m_parent->getNodeNoEx(getPosRelative() + p, is_valid_position);
 
 	if (!data) {
 		if (is_valid_position)
 			*is_valid_position = false;
-		return MapNode(CONTENT_IGNORE);
+		return {CONTENT_IGNORE};
 	}
 	if (is_valid_position)
 		*is_valid_position = true;
@@ -201,8 +199,7 @@ bool MapBlock::propagateSunlight(std::set<v3s16> & light_sources,
 				else
 				{
 					MapNode n = getNodeNoEx(v3s16(x, MAP_BLOCKSIZE-1, z));
-					if(m_gamedef->ndef()->get(n).sunlight_propagates == false)
-					{
+					if (!m_gamedef->ndef()->get(n).sunlight_propagates) {
 						no_sunlight = true;
 					}
 				}
@@ -423,12 +420,11 @@ s16 MapBlock::getGroundLevel(v2s16 p2d)
 		for(; y>=0; y--)
 		{
 			MapNode n = getNodeRef(p2d.X, y, p2d.Y);
-			if(m_gamedef->ndef()->get(n).walkable)
-			{
+			if (m_gamedef->ndef()->get(n).walkable) {
 				if(y == MAP_BLOCKSIZE-1)
 					return -2;
-				else
-					return y;
+
+				return y;
 			}
 		}
 		return -1;
@@ -481,11 +477,9 @@ static void getBlockNodeIdMapping(NameIdMapping *nimap, MapNode *nodes,
 		// Update the MapNode
 		nodes[i].setContent(id);
 	}
-	for(std::set<content_t>::const_iterator
-			i = unknown_contents.begin();
-			i != unknown_contents.end(); ++i){
-		errorstream<<"getBlockNodeIdMapping(): IGNORING ERROR: "
-				<<"Name for node id "<<(*i)<<" not known"<<std::endl;
+	for (u16 unknown_content : unknown_contents) {
+		errorstream << "getBlockNodeIdMapping(): IGNORING ERROR: "
+				<< "Name for node id " << unknown_content << " not known" << std::endl;
 	}
 }
 // Correct ids in the block to match nodedef based on names.
diff --git a/src/mapgen.h b/src/mapgen.h
index 8a9b8057e..6701cfdd0 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -122,7 +122,7 @@ enum MapgenType {
 };
 
 struct MapgenParams {
-	MapgenParams() {}
+	MapgenParams() = default;
 	virtual ~MapgenParams();
 
 	MapgenType mgtype = MAPGEN_DEFAULT;
diff --git a/src/mapgen_carpathian.h b/src/mapgen_carpathian.h
index 1e9bbcd31..b7c3935f7 100644
--- a/src/mapgen_carpathian.h
+++ b/src/mapgen_carpathian.h
@@ -59,7 +59,7 @@ struct MapgenCarpathianParams : public MapgenParams
 	NoiseParams np_cavern;
 
 	MapgenCarpathianParams();
-	~MapgenCarpathianParams() {}
+	~MapgenCarpathianParams() = default;
 
 	void readParams(const Settings *settings);
 	void writeParams(Settings *settings) const;
diff --git a/src/mapgen_flat.cpp b/src/mapgen_flat.cpp
index 34074c8b7..0343492d8 100644
--- a/src/mapgen_flat.cpp
+++ b/src/mapgen_flat.cpp
@@ -148,10 +148,11 @@ int MapgenFlat::getSpawnLevelAtPoint(v2s16 p)
 
 	if (ground_level < water_level)  // Ocean world, allow spawn in water
 		return MYMAX(level_at_point, water_level);
-	else if (level_at_point > water_level)
+
+	if (level_at_point > water_level)
 		return level_at_point;  // Spawn on land
-	else
-		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
+
+	return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
 }
 
 
diff --git a/src/mapgen_fractal.h b/src/mapgen_fractal.h
index a83c5b317..be4941581 100644
--- a/src/mapgen_fractal.h
+++ b/src/mapgen_fractal.h
@@ -50,7 +50,7 @@ struct MapgenFractalParams : public MapgenParams
 	NoiseParams np_cave2;
 
 	MapgenFractalParams();
-	~MapgenFractalParams() {}
+	~MapgenFractalParams() = default;
 
 	void readParams(const Settings *settings);
 	void writeParams(Settings *settings) const;
diff --git a/src/mapgen_singlenode.cpp b/src/mapgen_singlenode.cpp
index f49059f7f..ee8746b83 100644
--- a/src/mapgen_singlenode.cpp
+++ b/src/mapgen_singlenode.cpp
@@ -46,11 +46,6 @@ MapgenSinglenode::MapgenSinglenode(int mapgenid,
 }
 
 
-MapgenSinglenode::~MapgenSinglenode()
-{
-}
-
-
 //////////////////////// Map generator
 
 void MapgenSinglenode::makeChunk(BlockMakeData *data)
diff --git a/src/mapgen_singlenode.h b/src/mapgen_singlenode.h
index 38bc3e020..7678613e5 100644
--- a/src/mapgen_singlenode.h
+++ b/src/mapgen_singlenode.h
@@ -25,8 +25,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 struct MapgenSinglenodeParams : public MapgenParams
 {
-	MapgenSinglenodeParams() {}
-	~MapgenSinglenodeParams() {}
+	MapgenSinglenodeParams() = default;
+	~MapgenSinglenodeParams() = default;
 
 	void readParams(const Settings *settings) {}
 	void writeParams(Settings *settings) const {}
@@ -40,7 +40,7 @@ public:
 	u8 set_light;
 
 	MapgenSinglenode(int mapgenid, MapgenParams *params, EmergeManager *emerge);
-	~MapgenSinglenode();
+	~MapgenSinglenode() = default;
 
 	virtual MapgenType getType() const { return MAPGEN_SINGLENODE; }
 
diff --git a/src/mapgen_v5.cpp b/src/mapgen_v5.cpp
index 2cfb065f9..d7e9d6664 100644
--- a/src/mapgen_v5.cpp
+++ b/src/mapgen_v5.cpp
@@ -156,9 +156,9 @@ int MapgenV5::getSpawnLevelAtPoint(v2s16 p)
 		if (n_ground * f > y - h) {  // If solid
 			if (y < water_level || y > max_spawn_y)
 				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
-			else
-				// y + 2 because y is surface and due to biome 'dust' nodes.
-				return y + 2;
+
+			// y + 2 because y is surface and due to biome 'dust' nodes.
+			return y + 2;
 		}
 	}
 	// Unsuitable spawn position, no ground found
diff --git a/src/mapgen_v6.cpp b/src/mapgen_v6.cpp
index cbc4a19c3..ec33fee08 100644
--- a/src/mapgen_v6.cpp
+++ b/src/mapgen_v6.cpp
@@ -233,8 +233,8 @@ bool MapgenV6::block_is_underground(u64 seed, v3s16 blockpos)
 
 	if(blockpos.Y * MAP_BLOCKSIZE + MAP_BLOCKSIZE <= minimum_groundlevel)
 		return true;
-	else
-		return false;
+
+	return false;
 }
 
 
@@ -327,8 +327,8 @@ int MapgenV6::getSpawnLevelAtPoint(v2s16 p)
 	if (level_at_point <= water_level ||
 			level_at_point > water_level + 16)
 		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
-	else
-		return level_at_point;
+
+	return level_at_point;
 }
 
 
@@ -385,8 +385,8 @@ float MapgenV6::getTreeAmount(v2s16 p)
 	float zeroval = -0.39;
 	if (noise < zeroval)
 		return 0;
-	else
-		return 0.04 * (noise - zeroval) / (1.0 - zeroval);
+
+	return 0.04 * (noise - zeroval) / (1.0 - zeroval);
 }
 
 
@@ -443,16 +443,18 @@ BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 		if (d > MGV6_FREQ_HOT + blend) {
 			if (h > MGV6_FREQ_JUNGLE + blend)
 				return BT_JUNGLE;
-			else
-				return BT_DESERT;
-		} else if (d < MGV6_FREQ_SNOW + blend) {
+
+			return BT_DESERT;
+		}
+
+		if (d < MGV6_FREQ_SNOW + blend) {
 			if (h > MGV6_FREQ_TAIGA + blend)
 				return BT_TAIGA;
-			else
-				return BT_TUNDRA;
-		} else {
-			return BT_NORMAL;
+
+			return BT_TUNDRA;
 		}
+
+		return BT_NORMAL;
 	} else {
 		if (d > freq_desert)
 			return BT_DESERT;
@@ -463,8 +465,8 @@ BiomeV6Type MapgenV6::getBiome(int index, v2s16 p)
 
 		if ((spflags & MGV6_JUNGLES) && h > 0.75)
 			return BT_JUNGLE;
-		else
-			return BT_NORMAL;
+
+		return BT_NORMAL;
 	}
 }
 
@@ -818,7 +820,7 @@ void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 						u32 i2 = i;
 						vm->m_area.add_y(em, i2, -1);
 						// Cancel if out of area
-						if (vm->m_area.contains(i2) == false)
+						if (!vm->m_area.contains(i2))
 							continue;
 						MapNode *n2 = &vm->m_data[i2];
 						if (n2->getContent() != c_dirt &&
@@ -847,13 +849,12 @@ void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 				}
 
 				// Drop mud on side
-				for (u32 di = 0; di < 4; di++) {
-					v3s16 dirp = dirs4[di];
+				for (const v3s16 &dirp : dirs4) {
 					u32 i2 = i;
 					// Move to side
 					vm->m_area.add_p(em, i2, dirp);
 					// Fail if out of area
-					if (vm->m_area.contains(i2) == false)
+					if (!vm->m_area.contains(i2))
 						continue;
 					// Check that side is air
 					MapNode *n2 = &vm->m_data[i2];
@@ -861,7 +862,7 @@ void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 						continue;
 					// Check that under side is air
 					vm->m_area.add_y(em, i2, -1);
-					if (vm->m_area.contains(i2) == false)
+					if (!vm->m_area.contains(i2))
 						continue;
 					n2 = &vm->m_data[i2];
 					if (ndef->get(*n2).walkable)
@@ -872,12 +873,12 @@ void MapgenV6::flowMud(s16 &mudflow_minpos, s16 &mudflow_maxpos)
 						vm->m_area.add_y(em, i2, -1);
 						n2 = &vm->m_data[i2];
 						// if out of known area
-						if (vm->m_area.contains(i2) == false ||
+						if (!vm->m_area.contains(i2) ||
 								n2->getContent() == CONTENT_IGNORE) {
 							dropped_to_unknown = true;
 							break;
 						}
-					} while (ndef->get(*n2).walkable == false);
+					} while (!ndef->get(*n2).walkable);
 					// Loop one up so that we're in air
 					vm->m_area.add_y(em, i2, 1);
 
diff --git a/src/mapgen_v6.h b/src/mapgen_v6.h
index f92e90695..872679683 100644
--- a/src/mapgen_v6.h
+++ b/src/mapgen_v6.h
@@ -72,7 +72,7 @@ struct MapgenV6Params : public MapgenParams {
 	NoiseParams np_apple_trees;
 
 	MapgenV6Params();
-	~MapgenV6Params() {}
+	~MapgenV6Params() = default;
 
 	void readParams(const Settings *settings);
 	void writeParams(Settings *settings) const;
diff --git a/src/mapgen_v7.cpp b/src/mapgen_v7.cpp
index 3ce22dbb1..d27e339ce 100644
--- a/src/mapgen_v7.cpp
+++ b/src/mapgen_v7.cpp
@@ -240,9 +240,9 @@ int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 	if (!(spflags & MGV7_MOUNTAINS)) {
 		if (y < water_level || y > max_spawn_y)
 			return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
-		else
-			// y + 2 because y is surface level and due to biome 'dust'
-			return y + 2;
+
+		// y + 2 because y is surface level and due to biome 'dust'
+		return y + 2;
 	}
 
 	// Search upwards for first node without mountain terrain
@@ -251,9 +251,9 @@ int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
 		if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) {
 			if (y <= water_level || y > max_spawn_y)
 				return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
-			else
-				// y + 1 due to biome 'dust'
-				return y + 1;
+
+			// y + 1 due to biome 'dust'
+			return y + 1;
 		}
 		y++;
 		iters--;
diff --git a/src/mapgen_v7.h b/src/mapgen_v7.h
index f4d397135..877f3d089 100644
--- a/src/mapgen_v7.h
+++ b/src/mapgen_v7.h
@@ -65,7 +65,7 @@ struct MapgenV7Params : public MapgenParams {
 	NoiseParams np_cave2;
 
 	MapgenV7Params();
-	~MapgenV7Params() {}
+	~MapgenV7Params() = default;
 
 	void readParams(const Settings *settings);
 	void writeParams(Settings *settings) const;
diff --git a/src/mapgen_valleys.cpp b/src/mapgen_valleys.cpp
index f0c145934..d8b3193a6 100644
--- a/src/mapgen_valleys.cpp
+++ b/src/mapgen_valleys.cpp
@@ -435,8 +435,8 @@ int MapgenValleys::getSpawnLevelAtPoint(v2s16 p)
 	if (level_at_point <= water_level ||
 			level_at_point > water_level + 32)
 		return MAX_MAP_GENERATION_LIMIT;  // Unsuitable spawn point
-	else
-		return level_at_point;
+
+	return level_at_point;
 }
 
 
@@ -670,7 +670,8 @@ void MapgenValleys::generateCaves(s16 max_stone_y, s16 large_cave_depth)
 			// Saves some time.
 			if (y > terrain + 10)
 				continue;
-			else if (y < terrain - 40)
+
+			if (y < terrain - 40)
 				underground = true;
 
 			// Dig massive caves.
diff --git a/src/mapgen_valleys.h b/src/mapgen_valleys.h
index 1cb94860c..7b5eb187d 100644
--- a/src/mapgen_valleys.h
+++ b/src/mapgen_valleys.h
@@ -66,7 +66,7 @@ struct MapgenValleysParams : public MapgenParams {
 	NoiseParams np_valley_profile;
 
 	MapgenValleysParams();
-	~MapgenValleysParams() {}
+	~MapgenValleysParams() = default;
 
 	void readParams(const Settings *settings);
 	void writeParams(Settings *settings) const;
diff --git a/src/mapnode.cpp b/src/mapnode.cpp
index fd28910ff..b06b42ba8 100644
--- a/src/mapnode.cpp
+++ b/src/mapnode.cpp
@@ -249,18 +249,12 @@ void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 		int facedir = n.getFaceDir(nodemgr);
 		u8 axisdir = facedir>>2;
 		facedir&=0x03;
-		for(std::vector<aabb3f>::const_iterator
-				i = fixed.begin();
-				i != fixed.end(); ++i)
-		{
-			aabb3f box = *i;
-
+		for (aabb3f box : fixed) {
 			if (nodebox.type == NODEBOX_LEVELED) {
 				box.MaxEdge.Y = -BS/2 + BS*((float)1/LEVELED_MAX) * n.getLevel(nodemgr);
 			}
 
-			switch (axisdir)
-			{
+			switch (axisdir) {
 			case 0:
 				if(facedir == 1)
 				{
@@ -403,16 +397,15 @@ void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 				nodebox.wall_side.MaxEdge
 			};
 
-			for(s32 i=0; i<2; i++)
-			{
+			for (v3f &vertice : vertices) {
 				if(dir == v3s16(-1,0,0))
-					vertices[i].rotateXZBy(0);
+					vertice.rotateXZBy(0);
 				if(dir == v3s16(1,0,0))
-					vertices[i].rotateXZBy(180);
+					vertice.rotateXZBy(180);
 				if(dir == v3s16(0,0,-1))
-					vertices[i].rotateXZBy(90);
+					vertice.rotateXZBy(90);
 				if(dir == v3s16(0,0,1))
-					vertices[i].rotateXZBy(-90);
+					vertice.rotateXZBy(-90);
 			}
 
 			aabb3f box = aabb3f(vertices[0]);
@@ -467,7 +460,7 @@ void transformNodeBox(const MapNode &n, const NodeBox &nodebox,
 }
 
 static inline void getNeighborConnectingFace(
-	v3s16 p, INodeDefManager *nodedef,
+	const v3s16 &p, INodeDefManager *nodedef,
 	Map *map, MapNode n, u8 bitmask, u8 *neighbors)
 {
 	MapNode n2 = map->getNodeNoEx(p);
@@ -605,14 +598,16 @@ u32 MapNode::serializedLength(u8 version)
 	if(!ser_ver_supported(version))
 		throw VersionMismatchException("ERROR: MapNode format not supported");
 
-	if(version == 0)
+	if (version == 0)
 		return 1;
-	else if(version <= 9)
+
+	if (version <= 9)
 		return 2;
-	else if(version <= 23)
+
+	if (version <= 23)
 		return 3;
-	else
-		return 4;
+
+	return 4;
 }
 void MapNode::serialize(u8 *dest, u8 version)
 {
diff --git a/src/mapnode.h b/src/mapnode.h
index 200a51207..4b75fe227 100644
--- a/src/mapnode.h
+++ b/src/mapnode.h
@@ -137,8 +137,7 @@ struct MapNode
 	*/
 	u8 param2;
 
-	MapNode()
-	{ }
+	MapNode() = default;
 
 	MapNode(content_t content, u8 a_param1=0, u8 a_param2=0)
 		: param0(content),
diff --git a/src/mapsector.cpp b/src/mapsector.cpp
index 446b43747..c6832a012 100644
--- a/src/mapsector.cpp
+++ b/src/mapsector.cpp
@@ -40,9 +40,8 @@ void MapSector::deleteBlocks()
 	m_block_cache = nullptr;
 
 	// Delete all
-	for (std::unordered_map<s16, MapBlock*>::iterator i = m_blocks.begin();
-		 	i != m_blocks.end(); ++i) {
-		delete i->second;
+	for (auto &block : m_blocks) {
+		delete block.second;
 	}
 
 	// Clear container
@@ -125,9 +124,8 @@ void MapSector::deleteBlock(MapBlock *block)
 
 void MapSector::getBlocks(MapBlockVect &dest)
 {
-	for (std::unordered_map<s16, MapBlock*>::iterator bi = m_blocks.begin();
-		bi != m_blocks.end(); ++bi) {
-		dest.push_back(bi->second);
+	for (auto &block : m_blocks) {
+		dest.push_back(block.second);
 	}
 }
 
@@ -140,10 +138,6 @@ ServerMapSector::ServerMapSector(Map *parent, v2s16 pos, IGameDef *gamedef):
 {
 }
 
-ServerMapSector::~ServerMapSector()
-{
-}
-
 void ServerMapSector::serialize(std::ostream &os, u8 version)
 {
 	if(!ser_ver_supported(version))
@@ -212,11 +206,9 @@ ServerMapSector* ServerMapSector::deSerialize(
 		assert(sector->getId() == MAPSECTOR_SERVER);
 		return (ServerMapSector*)sector;
 	}
-	else
-	{
-		sector = new ServerMapSector(parent, p2d, gamedef);
-		sectors[p2d] = sector;
-	}
+
+	sector = new ServerMapSector(parent, p2d, gamedef);
+	sectors[p2d] = sector;
 
 	/*
 		Set stuff in sector
@@ -236,11 +228,6 @@ ClientMapSector::ClientMapSector(Map *parent, v2s16 pos, IGameDef *gamedef):
 		MapSector(parent, pos, gamedef)
 {
 }
-
-ClientMapSector::~ClientMapSector()
-{
-}
-
 #endif // !SERVER
 
 //END
diff --git a/src/mapsector.h b/src/mapsector.h
index ff1ca7be6..b0ed9c88c 100644
--- a/src/mapsector.h
+++ b/src/mapsector.h
@@ -94,7 +94,7 @@ class ServerMapSector : public MapSector
 {
 public:
 	ServerMapSector(Map *parent, v2s16 pos, IGameDef *gamedef);
-	~ServerMapSector();
+	~ServerMapSector() = default;
 
 	u32 getId() const
 	{
@@ -124,7 +124,7 @@ class ClientMapSector : public MapSector
 {
 public:
 	ClientMapSector(Map *parent, v2s16 pos, IGameDef *gamedef);
-	~ClientMapSector();
+	~ClientMapSector() = default;
 
 	u32 getId() const
 	{
diff --git a/src/mesh.cpp b/src/mesh.cpp
index 3ab67510a..218e2d0b2 100644
--- a/src/mesh.cpp
+++ b/src/mesh.cpp
@@ -453,11 +453,7 @@ scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
 
 	video::SColor c(255,255,255,255);
 
-	for (std::vector<aabb3f>::const_iterator
-			i = boxes.begin();
-			i != boxes.end(); ++i)
-	{
-		aabb3f box = *i;
+	for (aabb3f box : boxes) {
 		box.repair();
 
 		box.MinEdge.X -= expand;
@@ -614,9 +610,8 @@ class f_lru
 public:
 	f_lru(vcache *v, tcache *t): vc(v), tc(t)
 	{
-		for (u16 i = 0; i < cachesize; i++)
-		{
-			cache[i] = -1;
+		for (int &i : cache) {
+			i = -1;
 		}
 	}
 
@@ -671,15 +666,14 @@ public:
 			}
 
 			// Update triangle scores
-			for (u16 i = 0; i < cachesize; i++)
-			{
-				if (cache[i] == -1)
+			for (int i : cache) {
+				if (i == -1)
 					break;
 
-				const u16 trisize = vc[cache[i]].tris.size();
+				const u16 trisize = vc[i].tris.size();
 				for (u16 t = 0; t < trisize; t++)
 				{
-					tcache *tri = &tc[vc[cache[i]].tris[t]];
+					tcache *tri = &tc[vc[i].tris[t]];
 
 					tri->score =
 						vc[tri->ind[0]].score +
@@ -689,7 +683,7 @@ public:
 					if (tri->score > hiscore)
 					{
 						hiscore = tri->score;
-						highest = vc[cache[i]].tris[t];
+						highest = vc[i].tris[t];
 					}
 				}
 			}
@@ -876,9 +870,8 @@ scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
 
 					tc[highest].drawn = true;
 
-					for (u16 j = 0; j < 3; j++)
-					{
-						vcache *vert = &vc[tc[highest].ind[j]];
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
 						for (u16 t = 0; t < vert->tris.size(); t++)
 						{
 							if (highest == vert->tris[t])
@@ -988,9 +981,8 @@ scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
 
 					tc[highest].drawn = true;
 
-					for (u16 j = 0; j < 3; j++)
-					{
-						vcache *vert = &vc[tc[highest].ind[j]];
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
 						for (u16 t = 0; t < vert->tris.size(); t++)
 						{
 							if (highest == vert->tris[t])
@@ -1101,9 +1093,8 @@ scene::IMesh* createForsythOptimizedMesh(const scene::IMesh *mesh)
 
 					tc[highest].drawn = true;
 
-					for (u16 j = 0; j < 3; j++)
-					{
-						vcache *vert = &vc[tc[highest].ind[j]];
+					for (u16 j : tc[highest].ind) {
+						vcache *vert = &vc[j];
 						for (u16 t = 0; t < vert->tris.size(); t++)
 						{
 							if (highest == vert->tris[t])
diff --git a/src/mesh_generator_thread.cpp b/src/mesh_generator_thread.cpp
index b69d7f484..01f4fbd7e 100644
--- a/src/mesh_generator_thread.cpp
+++ b/src/mesh_generator_thread.cpp
@@ -63,14 +63,11 @@ MeshUpdateQueue::~MeshUpdateQueue()
 {
 	MutexAutoLock lock(m_mutex);
 
-	for (std::map<v3s16, CachedMapBlockData *>::iterator i = m_cache.begin();
-			i != m_cache.end(); ++i) {
-		delete i->second;
+	for (auto &i : m_cache) {
+		delete i.second;
 	}
 
-	for (std::vector<QueuedMeshUpdate*>::iterator i = m_queue.begin();
-			i != m_queue.end(); ++i) {
-		QueuedMeshUpdate *q = *i;
+	for (QueuedMeshUpdate *q : m_queue) {
 		delete q;
 	}
 }
@@ -116,9 +113,7 @@ void MeshUpdateQueue::addBlock(Map *map, v3s16 p, bool ack_block_to_server, bool
 		Find if block is already in queue.
 		If it is, update the data and quit.
 	*/
-	for (std::vector<QueuedMeshUpdate*>::iterator i = m_queue.begin();
-			i != m_queue.end(); ++i) {
-		QueuedMeshUpdate *q = *i;
+	for (QueuedMeshUpdate *q : m_queue) {
 		if (q->p == p) {
 			// NOTE: We are not adding a new position to the queue, thus
 			//       refcount_from_queue stays the same.
@@ -141,8 +136,8 @@ void MeshUpdateQueue::addBlock(Map *map, v3s16 p, bool ack_block_to_server, bool
 	m_queue.push_back(q);
 
 	// This queue entry is a new reference to the cached blocks
-	for (size_t i=0; i<cached_blocks.size(); i++) {
-		cached_blocks[i]->refcount_from_queue++;
+	for (CachedMapBlockData *cached_block : cached_blocks) {
+		cached_block->refcount_from_queue++;
 	}
 }
 
@@ -191,19 +186,19 @@ CachedMapBlockData* MeshUpdateQueue::cacheBlock(Map *map, v3s16 p, UpdateMode mo
 			cached_block->data = NULL;
 		}
 		return cached_block;
-	} else {
-		// Not yet in cache
-		CachedMapBlockData *cached_block = new CachedMapBlockData();
-		m_cache[p] = cached_block;
-		MapBlock *b = map->getBlockNoCreateNoEx(p);
-		if (b) {
-			cached_block->data =
-					new MapNode[MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE];
-			memcpy(cached_block->data, b->getData(),
-					MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE * sizeof(MapNode));
-		}
-		return cached_block;
 	}
+
+	// Not yet in cache
+	CachedMapBlockData *cached_block = new CachedMapBlockData();
+	m_cache[p] = cached_block;
+	MapBlock *b = map->getBlockNoCreateNoEx(p);
+	if (b) {
+		cached_block->data =
+				new MapNode[MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE];
+		memcpy(cached_block->data, b->getData(),
+				MAP_BLOCKSIZE * MAP_BLOCKSIZE * MAP_BLOCKSIZE * sizeof(MapNode));
+	}
+	return cached_block;
 }
 
 CachedMapBlockData* MeshUpdateQueue::getCachedBlock(const v3s16 &p)
diff --git a/src/mg_biome.cpp b/src/mg_biome.cpp
index 2ef2ed16a..8dbb78e59 100644
--- a/src/mg_biome.cpp
+++ b/src/mg_biome.cpp
@@ -51,25 +51,20 @@ BiomeManager::BiomeManager(Server *server) :
 	b->heat_point      = 0.0;
 	b->humidity_point  = 0.0;
 
-	b->m_nodenames.push_back("mapgen_stone");
-	b->m_nodenames.push_back("mapgen_stone");
-	b->m_nodenames.push_back("mapgen_stone");
-	b->m_nodenames.push_back("mapgen_water_source");
-	b->m_nodenames.push_back("mapgen_water_source");
-	b->m_nodenames.push_back("mapgen_river_water_source");
-	b->m_nodenames.push_back("mapgen_stone");
-	b->m_nodenames.push_back("ignore");
+	b->m_nodenames.emplace_back("mapgen_stone");
+	b->m_nodenames.emplace_back("mapgen_stone");
+	b->m_nodenames.emplace_back("mapgen_stone");
+	b->m_nodenames.emplace_back("mapgen_water_source");
+	b->m_nodenames.emplace_back("mapgen_water_source");
+	b->m_nodenames.emplace_back("mapgen_river_water_source");
+	b->m_nodenames.emplace_back("mapgen_stone");
+	b->m_nodenames.emplace_back("ignore");
 	m_ndef->pendNodeResolve(b);
 
 	add(b);
 }
 
 
-BiomeManager::~BiomeManager()
-{
-}
-
-
 void BiomeManager::clear()
 {
 	EmergeManager *emerge = m_server->getEmergeManager();
diff --git a/src/mg_biome.h b/src/mg_biome.h
index e64f36b13..f45238f28 100644
--- a/src/mg_biome.h
+++ b/src/mg_biome.h
@@ -83,14 +83,15 @@ enum BiomeGenType {
 struct BiomeParams {
 	virtual void readParams(const Settings *settings) = 0;
 	virtual void writeParams(Settings *settings) const = 0;
-	virtual ~BiomeParams() {}
+	virtual ~BiomeParams() = default;
 
 	s32 seed;
 };
 
 class BiomeGen {
 public:
-	virtual ~BiomeGen() {}
+	virtual ~BiomeGen() = default;
+
 	virtual BiomeGenType getType() const = 0;
 
 	// Calculates the biome at the exact position provided.  This function can
@@ -188,7 +189,7 @@ private:
 class BiomeManager : public ObjDefManager {
 public:
 	BiomeManager(Server *server);
-	virtual ~BiomeManager();
+	virtual ~BiomeManager() = default;
 
 	const char *getObjectTitle() const
 	{
diff --git a/src/mg_decoration.h b/src/mg_decoration.h
index 8feaa9850..fd6e89e79 100644
--- a/src/mg_decoration.h
+++ b/src/mg_decoration.h
@@ -63,8 +63,8 @@ struct CutoffData {
 
 class Decoration : public ObjDef, public NodeResolver {
 public:
-	Decoration() {};
-	virtual ~Decoration() {};
+	Decoration() = default;
+	virtual ~Decoration() = default;
 
 	virtual void resolveNodeNames();
 
@@ -104,7 +104,7 @@ public:
 
 class DecoSchematic : public Decoration {
 public:
-	DecoSchematic() {};
+	DecoSchematic() = default;
 
 	virtual size_t generate(MMVManip *vm, PcgRandom *pr, v3s16 p);
 	virtual int getHeight();
@@ -124,7 +124,7 @@ public:
 class DecorationManager : public ObjDefManager {
 public:
 	DecorationManager(IGameDef *gamedef);
-	virtual ~DecorationManager() {}
+	virtual ~DecorationManager() = default;
 
 	const char *getObjectTitle() const
 	{
diff --git a/src/mg_ore.cpp b/src/mg_ore.cpp
index 044d58db8..5f11dda92 100644
--- a/src/mg_ore.cpp
+++ b/src/mg_ore.cpp
@@ -64,8 +64,8 @@ size_t OreManager::placeAllOres(Mapgen *mg, u32 blockseed,
 
 void OreManager::clear()
 {
-	for (size_t i = 0; i < m_objects.size(); i++) {
-		Ore *ore = (Ore *)m_objects[i];
+	for (ObjDef *object : m_objects) {
+		Ore *ore = (Ore *) object;
 		delete ore;
 	}
 	m_objects.clear();
@@ -221,13 +221,6 @@ void OreSheet::generate(MMVManip *vm, int mapseed, u32 blockseed,
 
 
 ///////////////////////////////////////////////////////////////////////////////
-
-OrePuff::OrePuff() :
-	Ore()
-{
-}
-
-
 OrePuff::~OrePuff()
 {
 	delete noise_puff_top;
@@ -372,13 +365,6 @@ void OreBlob::generate(MMVManip *vm, int mapseed, u32 blockseed,
 
 
 ///////////////////////////////////////////////////////////////////////////////
-
-OreVein::OreVein() :
-	Ore()
-{
-}
-
-
 OreVein::~OreVein()
 {
 	delete noise2;
diff --git a/src/mg_ore.h b/src/mg_ore.h
index dea1d4272..eaaf2b883 100644
--- a/src/mg_ore.h
+++ b/src/mg_ore.h
@@ -104,7 +104,7 @@ public:
 	Noise *noise_puff_top = nullptr;
 	Noise *noise_puff_bottom = nullptr;
 
-	OrePuff();
+	OrePuff() = default;
 	virtual ~OrePuff();
 
 	virtual void generate(MMVManip *vm, int mapseed, u32 blockseed,
@@ -126,7 +126,7 @@ public:
 	float random_factor;
 	Noise *noise2 = nullptr;
 
-	OreVein();
+	OreVein() = default;
 	virtual ~OreVein();
 
 	virtual void generate(MMVManip *vm, int mapseed, u32 blockseed,
diff --git a/src/mg_schematic.h b/src/mg_schematic.h
index fc6488c4d..069b594f1 100644
--- a/src/mg_schematic.h
+++ b/src/mg_schematic.h
@@ -125,7 +125,7 @@ public:
 class SchematicManager : public ObjDefManager {
 public:
 	SchematicManager(Server *server);
-	virtual ~SchematicManager() {}
+	virtual ~SchematicManager() = default;
 
 	virtual void clear();
 
diff --git a/src/minimap.cpp b/src/minimap.cpp
index dab5f3aa5..f35330963 100644
--- a/src/minimap.cpp
+++ b/src/minimap.cpp
@@ -46,10 +46,7 @@ bool MinimapUpdateThread::pushBlockUpdate(v3s16 pos, MinimapMapblock *data)
 
 	// Find if block is already in queue.
 	// If it is, update the data and quit.
-	for (std::deque<QueuedMinimapUpdate>::iterator
-			it = m_update_queue.begin();
-			it != m_update_queue.end(); ++it) {
-		QueuedMinimapUpdate &q = *it;
+	for (QueuedMinimapUpdate &q : m_update_queue) {
 		if (q.pos == pos) {
 			delete q.data;
 			q.data = data;
@@ -277,9 +274,9 @@ MinimapShape Minimap::getMinimapShape()
 {
 	if (data->minimap_shape_round) {
 		return MINIMAP_SHAPE_ROUND;
-	} else {
-		return MINIMAP_SHAPE_SQUARE;
 	}
+
+	return MINIMAP_SHAPE_SQUARE;
 }
 
 void Minimap::setMinimapMode(MinimapMode mode)
@@ -434,9 +431,9 @@ v3f Minimap::getYawVec()
 			cos(m_angle * core::DEGTORAD),
 			sin(m_angle * core::DEGTORAD),
 			1.0);
-	} else {
-		return v3f(1.0, 0.0, 1.0);
 	}
+
+	return v3f(1.0, 0.0, 1.0);
 }
 
 scene::SMeshBuffer *Minimap::getMinimapMeshBuffer()
@@ -568,9 +565,8 @@ void Minimap::updateActiveMarkers()
 
 	m_active_markers.clear();
 
-	for (std::list<Nametag *>::const_iterator i = nametags.begin();
-			i != nametags.end(); ++i) {
-		v3s16 pos = floatToInt((*i)->parent_node->getPosition() +
+	for (Nametag *nametag : nametags) {
+		v3s16 pos = floatToInt(nametag->parent_node->getPosition() +
 			intToFloat(client->getCamera()->getOffset(), BS), BS);
 		pos -= data->pos - v3s16(data->map_size / 2,
 				data->scan_height / 2,
@@ -586,8 +582,9 @@ void Minimap::updateActiveMarkers()
 		if (!mask_col.getAlpha()) {
 			continue;
 		}
-		m_active_markers.push_back(v2f(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
-			(1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5));
+
+		m_active_markers.emplace_back(((float)pos.X / (float)MINIMAP_MAX_SX) - 0.5,
+			(1.0 - (float)pos.Z / (float)MINIMAP_MAX_SY) - 0.5);
 	}
 }
 
diff --git a/src/modalMenu.h b/src/modalMenu.h
index eeffc6195..f41591c3f 100644
--- a/src/modalMenu.h
+++ b/src/modalMenu.h
@@ -111,16 +111,12 @@ public:
 	{
 		const core::list<gui::IGUIElement*> &children = getChildren();
 		core::list<gui::IGUIElement*> children_copy;
-		for(core::list<gui::IGUIElement*>::ConstIterator
-				i = children.begin(); i != children.end(); i++)
-		{
-			children_copy.push_back(*i);
+		for (gui::IGUIElement *i : children) {
+			children_copy.push_back(i);
 		}
-		for(core::list<gui::IGUIElement*>::Iterator
-				i = children_copy.begin();
-				i != children_copy.end(); i++)
-		{
-			(*i)->remove();
+
+		for (gui::IGUIElement *i : children_copy) {
+			i->remove();
 		}
 	}
 
diff --git a/src/mods.cpp b/src/mods.cpp
index 7e2d83944..d28288a89 100644
--- a/src/mods.cpp
+++ b/src/mods.cpp
@@ -41,7 +41,7 @@ static bool parseDependsLine(std::istream &is,
 		--pos;
 	}
 	dep = trim(dep.substr(0, pos));
-	return dep != "";
+	return !dep.empty();
 }
 
 void parseModContents(ModSpec &spec)
@@ -91,13 +91,13 @@ std::map<std::string, ModSpec> getModsInPath(std::string path, bool part_of_modp
 
 	std::map<std::string, ModSpec> result;
 	std::vector<fs::DirListNode> dirlist = fs::GetDirListing(path);
-	for(u32 j=0; j<dirlist.size(); j++){
-		if(!dirlist[j].dir)
+	for (const fs::DirListNode &dln : dirlist) {
+		if(!dln.dir)
 			continue;
-		std::string modname = dirlist[j].name;
+		const std::string &modname = dln.name;
 		// Ignore all directories beginning with a ".", especially
 		// VCS directories like ".git" or ".svn"
-		if(modname[0] == '.')
+		if (modname[0] == '.')
 			continue;
 		std::string modpath = path + DIR_DELIM + modname;
 
@@ -112,12 +112,9 @@ std::map<std::string, ModSpec> getModsInPath(std::string path, bool part_of_modp
 std::vector<ModSpec> flattenMods(std::map<std::string, ModSpec> mods)
 {
 	std::vector<ModSpec> result;
-	for(std::map<std::string,ModSpec>::iterator it = mods.begin();
-		it != mods.end(); ++it)
-	{
-		ModSpec mod = (*it).second;
-		if(mod.is_modpack)
-		{
+	for (const auto &it : mods) {
+		const ModSpec &mod = it.second;
+		if (mod.is_modpack) {
 			std::vector<ModSpec> content = flattenMods(mod.modpack_content);
 			result.reserve(result.size() + content.size());
 			result.insert(result.end(),content.begin(),content.end());
@@ -131,23 +128,16 @@ std::vector<ModSpec> flattenMods(std::map<std::string, ModSpec> mods)
 	return result;
 }
 
-ModConfiguration::ModConfiguration(const std::string &worldpath):
-	m_unsatisfied_mods(),
-	m_sorted_mods(),
-	m_name_conflicts()
+ModConfiguration::ModConfiguration(const std::string &worldpath)
 {
 }
 
 void ModConfiguration::printUnsatisfiedModsError() const
 {
-	for (std::vector<ModSpec>::const_iterator it = m_unsatisfied_mods.begin();
-		it != m_unsatisfied_mods.end(); ++it) {
-		ModSpec mod = *it;
+	for (const ModSpec &mod : m_unsatisfied_mods) {
 		errorstream << "mod \"" << mod.name << "\" has unsatisfied dependencies: ";
-		for (std::unordered_set<std::string>::iterator dep_it =
-			mod.unsatisfied_depends.begin();
-			dep_it != mod.unsatisfied_depends.end(); ++dep_it)
-			errorstream << " \"" << *dep_it << "\"";
+		for (const std::string &unsatisfied_depend : mod.unsatisfied_depends)
+			errorstream << " \"" << unsatisfied_depend << "\"";
 		errorstream << std::endl;
 	}
 }
@@ -175,17 +165,15 @@ void ModConfiguration::addMods(const std::vector<ModSpec> &new_mods)
 
 		std::set<std::string> seen_this_iteration;
 
-		for (std::vector<ModSpec>::const_iterator it = new_mods.begin();
-				it != new_mods.end(); ++it) {
-			const ModSpec &mod = *it;
-			if(mod.part_of_modpack != (bool)want_from_modpack)
+		for (const ModSpec &mod : new_mods) {
+			if (mod.part_of_modpack != (bool)want_from_modpack)
 				continue;
-			if(existing_mods.count(mod.name) == 0){
+
+			if (existing_mods.count(mod.name) == 0) {
 				// GOOD CASE: completely new mod.
 				m_unsatisfied_mods.push_back(mod);
 				existing_mods[mod.name] = m_unsatisfied_mods.size() - 1;
-			}
-			else if(seen_this_iteration.count(mod.name) == 0){
+			} else if(seen_this_iteration.count(mod.name) == 0) {
 				// BAD CASE: name conflict in different levels.
 				u32 oldindex = existing_mods[mod.name];
 				const ModSpec &oldmod = m_unsatisfied_mods[oldindex];
@@ -198,8 +186,7 @@ void ModConfiguration::addMods(const std::vector<ModSpec> &new_mods)
 				// If there was a "VERY BAD CASE" name conflict
 				// in an earlier level, ignore it.
 				m_name_conflicts.erase(mod.name);
-			}
-			else{
+			} else {
 				// VERY BAD CASE: name conflict in the same level.
 				u32 oldindex = existing_mods[mod.name];
 				const ModSpec &oldmod = m_unsatisfied_mods[oldindex];
@@ -210,6 +197,7 @@ void ModConfiguration::addMods(const std::vector<ModSpec> &new_mods)
 				m_unsatisfied_mods[oldindex] = mod;
 				m_name_conflicts.insert(mod.name);
 			}
+
 			seen_this_iteration.insert(mod.name);
 		}
 	}
@@ -222,17 +210,14 @@ void ModConfiguration::addModsFormConfig(const std::string &settings_path, const
 
 	conf.readConfigFile(settings_path.c_str());
 	std::vector<std::string> names = conf.getNames();
-	for (std::vector<std::string>::iterator it = names.begin();
-		it != names.end(); ++it) {
-		std::string name = *it;
+	for (const std::string &name : names) {
 		if (name.compare(0,9,"load_mod_")==0 && conf.getBool(name))
 			load_mod_names.insert(name.substr(9));
 	}
 
 	std::vector<ModSpec> addon_mods;
-	for (std::set<std::string>::const_iterator i = mods.begin();
-			i != mods.end(); ++i) {
-		std::vector<ModSpec> addon_mods_in_path = flattenMods(getModsInPath(*i));
+	for (const std::string &i : mods) {
+		std::vector<ModSpec> addon_mods_in_path = flattenMods(getModsInPath(i));
 		for (std::vector<ModSpec>::const_iterator it = addon_mods_in_path.begin();
 				it != addon_mods_in_path.end(); ++it) {
 			const ModSpec& mod = *it;
@@ -248,18 +233,18 @@ void ModConfiguration::addModsFormConfig(const std::string &settings_path, const
 	checkConflictsAndDeps();
 
 	// complain about mods declared to be loaded, but not found
-	for (std::vector<ModSpec>::iterator it = addon_mods.begin();
-			it != addon_mods.end(); ++it)
-		load_mod_names.erase((*it).name);
-	std::vector<ModSpec> UnsatisfiedMods = getUnsatisfiedMods();
-	for (std::vector<ModSpec>::iterator it = UnsatisfiedMods.begin();
-			it != UnsatisfiedMods.end(); ++it)
-		load_mod_names.erase((*it).name);
+	for (const ModSpec &addon_mod : addon_mods)
+		load_mod_names.erase(addon_mod.name);
+
+	std::vector<ModSpec> unsatisfiedMods = getUnsatisfiedMods();
+
+	for (const ModSpec &unsatisfiedMod : unsatisfiedMods)
+		load_mod_names.erase(unsatisfiedMod.name);
+
 	if (!load_mod_names.empty()) {
 		errorstream << "The following mods could not be found:";
-		for (std::set<std::string>::iterator it = load_mod_names.begin();
-				it != load_mod_names.end(); ++it)
-			errorstream << " \"" << (*it) << "\"";
+		for (const std::string &mod : load_mod_names)
+			errorstream << " \"" << mod << "\"";
 		errorstream << std::endl;
 	}
 }
@@ -286,23 +271,18 @@ void ModConfiguration::resolveDependencies()
 {
 	// Step 1: Compile a list of the mod names we're working with
 	std::set<std::string> modnames;
-	for(std::vector<ModSpec>::iterator it = m_unsatisfied_mods.begin();
-		it != m_unsatisfied_mods.end(); ++it){
-		modnames.insert((*it).name);
+	for (const ModSpec &mod : m_unsatisfied_mods) {
+		modnames.insert(mod.name);
 	}
 
 	// Step 2: get dependencies (including optional dependencies)
 	// of each mod, split mods into satisfied and unsatisfied
 	std::list<ModSpec> satisfied;
 	std::list<ModSpec> unsatisfied;
-	for (std::vector<ModSpec>::iterator it = m_unsatisfied_mods.begin();
-			it != m_unsatisfied_mods.end(); ++it) {
-		ModSpec mod = *it;
+	for (ModSpec mod : m_unsatisfied_mods) {
 		mod.unsatisfied_depends = mod.depends;
 		// check which optional dependencies actually exist
-		for (std::unordered_set<std::string>::iterator it_optdep = mod.optdepends.begin();
-				it_optdep != mod.optdepends.end(); ++it_optdep) {
-			std::string optdep = *it_optdep;
+		for (const std::string &optdep : mod.optdepends) {
 			if (modnames.count(optdep) != 0)
 				mod.unsatisfied_depends.insert(optdep);
 		}
@@ -319,15 +299,13 @@ void ModConfiguration::resolveDependencies()
 		ModSpec mod = satisfied.back();
 		m_sorted_mods.push_back(mod);
 		satisfied.pop_back();
-		for(std::list<ModSpec>::iterator it = unsatisfied.begin();
-				it != unsatisfied.end(); ){
+		for (auto it = unsatisfied.begin(); it != unsatisfied.end(); ) {
 			ModSpec& mod2 = *it;
 			mod2.unsatisfied_depends.erase(mod.name);
-			if(mod2.unsatisfied_depends.empty()){
+			if (mod2.unsatisfied_depends.empty()) {
 				satisfied.push_back(mod2);
 				it = unsatisfied.erase(it);
-			}
-			else{
+			} else {
 				++it;
 			}
 		}
@@ -425,10 +403,9 @@ bool ModMetadata::load(const std::string &root_path)
 	}
 
 	const Json::Value::Members attr_list = root.getMemberNames();
-	for (Json::Value::Members::const_iterator it = attr_list.begin();
-			it != attr_list.end(); ++it) {
-		Json::Value attr_value = root[*it];
-		m_stringvars[*it] = attr_value.asString();
+	for (const auto &it : attr_list) {
+		Json::Value attr_value = root[it];
+		m_stringvars[it] = attr_value.asString();
 	}
 
 	return true;
diff --git a/src/mods.h b/src/mods.h
index 63927a9d0..27464b86e 100644
--- a/src/mods.h
+++ b/src/mods.h
@@ -121,7 +121,7 @@ private:
 	std::unordered_set<std::string> m_name_conflicts;
 
 	// Deleted default constructor
-	ModConfiguration() {}
+	ModConfiguration() = default;
 
 };
 
@@ -155,7 +155,7 @@ class ModMetadata: public Metadata
 {
 public:
 	ModMetadata(const std::string &mod_name);
-	~ModMetadata() {}
+	~ModMetadata() = default;
 
 	virtual void clear();