l_server, clientenvironment, clientiface: code modernization

* use range-based for loops
* use refs on some exceptions & one setter

4 files changed, 37 insertions, 58 deletions

diff --git a/src/clientenvironment.cpp b/src/clientenvironment.cpp
index c98b5fc90..57b18760a 100644
--- a/src/clientenvironment.cpp
+++ b/src/clientenvironment.cpp
@@ -52,14 +52,12 @@ ClientEnvironment::ClientEnvironment(ClientMap *map,
 ClientEnvironment::~ClientEnvironment()
 {
 	// delete active objects
-	for (ClientActiveObjectMap::iterator i = m_active_objects.begin();
-			i != m_active_objects.end(); ++i) {
-		delete i->second;
+	for (auto &active_object : m_active_objects) {
+		delete active_object.second;
 	}
 
-	for(std::vector<ClientSimpleObject*>::iterator
-		i = m_simple_objects.begin(); i != m_simple_objects.end(); ++i) {
-		delete *i;
+	for (auto &simple_object : m_simple_objects) {
+		delete simple_object;
 	}
 
 	// Drop/delete map
@@ -211,13 +209,11 @@ void ClientEnvironment::step(float dtime)
 
 	//std::cout<<"Looped "<<loopcount<<" times."<<std::endl;
 
-	for(std::vector<CollisionInfo>::iterator i = player_collisions.begin();
-		i != player_collisions.end(); ++i) {
-		CollisionInfo &info = *i;
+	for (const CollisionInfo &info : player_collisions) {
 		v3f speed_diff = info.new_speed - info.old_speed;;
 		// Handle only fall damage
 		// (because otherwise walking against something in fast_move kills you)
-		if(speed_diff.Y < 0 || info.old_speed.Y >= 0)
+		if (speed_diff.Y < 0 || info.old_speed.Y >= 0)
 			continue;
 		// Get rid of other components
 		speed_diff.X = 0;
@@ -225,8 +221,7 @@ void ClientEnvironment::step(float dtime)
 		f32 pre_factor = 1; // 1 hp per node/s
 		f32 tolerance = BS*14; // 5 without damage
 		f32 post_factor = 1; // 1 hp per node/s
-		if(info.type == COLLISION_NODE)
-		{
+		if (info.type == COLLISION_NODE) {
 			const ContentFeatures &f = m_client->ndef()->
 				get(m_map->getNodeNoEx(info.node_p));
 			// Determine fall damage multiplier
@@ -343,14 +338,12 @@ void ClientEnvironment::step(float dtime)
 
 	g_profiler->avg("CEnv: num of objects", m_active_objects.size());
 	bool update_lighting = m_active_object_light_update_interval.step(dtime, 0.21);
-	for (ClientActiveObjectMap::iterator i = m_active_objects.begin();
-			i != m_active_objects.end(); ++i) {
-		ClientActiveObject* obj = i->second;
+	for (auto &ao_it : m_active_objects) {
+		ClientActiveObject* obj = ao_it.second;
 		// Step object
 		obj->step(dtime, this);
 
-		if(update_lighting)
-		{
+		if (update_lighting) {
 			// Update lighting
 			u8 light = 0;
 			bool pos_ok;
@@ -371,9 +364,8 @@ void ClientEnvironment::step(float dtime)
 		Step and handle simple objects
 	*/
 	g_profiler->avg("CEnv: num of simple objects", m_simple_objects.size());
-	for(std::vector<ClientSimpleObject*>::iterator
-		i = m_simple_objects.begin(); i != m_simple_objects.end();) {
-		std::vector<ClientSimpleObject*>::iterator cur = i;
+	for (auto i = m_simple_objects.begin(); i != m_simple_objects.end();) {
+		auto cur = i;
 		ClientSimpleObject *simple = *cur;
 
 		simple->step(dtime);
@@ -397,13 +389,13 @@ GenericCAO* ClientEnvironment::getGenericCAO(u16 id)
 	ClientActiveObject *obj = getActiveObject(id);
 	if (obj && obj->getType() == ACTIVEOBJECT_TYPE_GENERIC)
 		return (GenericCAO*) obj;
-	else
-		return NULL;
+
+	return NULL;
 }
 
 ClientActiveObject* ClientEnvironment::getActiveObject(u16 id)
 {
-	ClientActiveObjectMap::iterator n = m_active_objects.find(id);
+	auto n = m_active_objects.find(id);
 	if (n == m_active_objects.end())
 		return NULL;
 	return n->second;
@@ -412,10 +404,8 @@ ClientActiveObject* ClientEnvironment::getActiveObject(u16 id)
 bool isFreeClientActiveObjectId(const u16 id,
 	ClientActiveObjectMap &objects)
 {
-	if(id == 0)
-		return false;
+	return id != 0 && objects.find(id) == objects.end();
 
-	return objects.find(id) == objects.end();
 }
 
 u16 getFreeClientActiveObjectId(ClientActiveObjectMap &objects)
@@ -580,18 +570,15 @@ void ClientEnvironment::updateLocalPlayerBreath(u16 breath)
 void ClientEnvironment::getActiveObjects(v3f origin, f32 max_d,
 	std::vector<DistanceSortedActiveObject> &dest)
 {
-	for (ClientActiveObjectMap::iterator i = m_active_objects.begin();
-			i != m_active_objects.end(); ++i) {
-		ClientActiveObject* obj = i->second;
+	for (auto &ao_it : m_active_objects) {
+		ClientActiveObject* obj = ao_it.second;
 
 		f32 d = (obj->getPosition() - origin).getLength();
 
-		if(d > max_d)
+		if (d > max_d)
 			continue;
 
-		DistanceSortedActiveObject dso(obj, d);
-
-		dest.push_back(dso);
+		dest.emplace_back(obj, d);
 	}
 }
 
@@ -614,12 +601,13 @@ void ClientEnvironment::getSelectedActiveObjects(
 		shootline_on_map.getLength() + 10.0f, allObjects);
 	const v3f line_vector = shootline_on_map.getVector();
 
-	for (u32 i = 0; i < allObjects.size(); i++) {
-		ClientActiveObject *obj = allObjects[i].obj;
+	for (const auto &allObject : allObjects) {
+		ClientActiveObject *obj = allObject.obj;
 		aabb3f selection_box;
 		if (!obj->getSelectionBox(&selection_box))
 			continue;
-		v3f pos = obj->getPosition();
+
+		const v3f &pos = obj->getPosition();
 		aabb3f offsetted_box(selection_box.MinEdge + pos,
 			selection_box.MaxEdge + pos);
 
@@ -627,9 +615,8 @@ void ClientEnvironment::getSelectedActiveObjects(
 		v3s16 current_normal;
 		if (boxLineCollision(offsetted_box, shootline_on_map.start, line_vector,
 				&current_intersection, &current_normal)) {
-			objects.push_back(PointedThing(
-				(s16) obj->getId(), current_intersection, current_normal,
-				(current_intersection - shootline_on_map.start).getLengthSQ()));
+			objects.emplace_back((s16) obj->getId(), current_intersection, current_normal,
+				(current_intersection - shootline_on_map.start).getLengthSQ());
 		}
 	}
 }
diff --git a/src/clientenvironment.h b/src/clientenvironment.h
index 35dca5718..d384bf78c 100644
--- a/src/clientenvironment.h
+++ b/src/clientenvironment.h
@@ -139,7 +139,7 @@ public:
 	const std::list<std::string> &getPlayerNames() { return m_player_names; }
 	void addPlayerName(const std::string &name) { m_player_names.push_back(name); }
 	void removePlayerName(const std::string &name) { m_player_names.remove(name); }
-	void updateCameraOffset(v3s16 camera_offset)
+	void updateCameraOffset(const v3s16 &camera_offset)
 	{ m_camera_offset = camera_offset; }
 	v3s16 getCameraOffset() const { return m_camera_offset; }
 private:
diff --git a/src/clientiface.h b/src/clientiface.h
index b19a91b6f..36aa3572d 100644
--- a/src/clientiface.h
+++ b/src/clientiface.h
@@ -205,7 +205,7 @@ enum ClientStateEvent
 */
 struct PrioritySortedBlockTransfer
 {
-	PrioritySortedBlockTransfer(float a_priority, v3s16 a_pos, u16 a_peer_id)
+	PrioritySortedBlockTransfer(float a_priority, const v3s16 &a_pos, u16 a_peer_id)
 	{
 		priority = a_priority;
 		pos = a_pos;
@@ -246,8 +246,8 @@ public:
 	bool isMechAllowed(AuthMechanism mech)
 	{ return allowed_auth_mechs & mech; }
 
-	RemoteClient() {}
-	~RemoteClient() {}
+	RemoteClient() = default;
+	~RemoteClient() = default;
 
 	/*
 		Finds block that should be sent next to the client.
@@ -495,7 +495,6 @@ private:
 
 	// Environment
 	ServerEnvironment *m_env;
-	std::mutex m_env_mutex;
 
 	float m_print_info_timer;
 
diff --git a/src/script/lua_api/l_server.cpp b/src/script/lua_api/l_server.cpp
index a0e475dec..e60d1d2d6 100644
--- a/src/script/lua_api/l_server.cpp
+++ b/src/script/lua_api/l_server.cpp
@@ -103,10 +103,9 @@ int ModApiServer::l_get_player_privs(lua_State *L)
 	lua_newtable(L);
 	int table = lua_gettop(L);
 	std::set<std::string> privs_s = server->getPlayerEffectivePrivs(name);
-	for(std::set<std::string>::const_iterator
-			i = privs_s.begin(); i != privs_s.end(); ++i){
+	for (const std::string &privs_ : privs_s) {
 		lua_pushboolean(L, true);
-		lua_setfield(L, table, i->c_str());
+		lua_setfield(L, table, privs_.c_str());
 	}
 	lua_pushvalue(L, table);
 	return 1;
@@ -129,9 +128,7 @@ int ModApiServer::l_get_player_ip(lua_State *L)
 		std::string ip_str = addr.serializeString();
 		lua_pushstring(L, ip_str.c_str());
 		return 1;
-	}
-	catch(con::PeerNotFoundException) // unlikely
-	{
+	} catch (const con::PeerNotFoundException &) {
 		dstream << FUNCTION_NAME << ": peer was not found" << std::endl;
 		lua_pushnil(L); // error
 		return 1;
@@ -154,9 +151,7 @@ int ModApiServer::l_get_player_information(lua_State *L)
 	try
 	{
 		addr = getServer(L)->getPeerAddress(player->peer_id);
-	}
-	catch(con::PeerNotFoundException) // unlikely
-	{
+	} catch(const con::PeerNotFoundException &) {
 		dstream << FUNCTION_NAME << ": peer was not found" << std::endl;
 		lua_pushnil(L); // error
 		return 1;
@@ -235,7 +230,7 @@ int ModApiServer::l_get_player_information(lua_State *L)
 	lua_pushstring(L,"protocol_version");
 	lua_pushnumber(L, prot_vers);
 	lua_settable(L, table);
-	
+
 #ifndef NDEBUG
 	lua_pushstring(L,"serialization_version");
 	lua_pushnumber(L, ser_vers);
@@ -299,9 +294,7 @@ int ModApiServer::l_ban_player(lua_State *L)
 			dynamic_cast<ServerEnvironment *>(getEnv(L))->getPlayer(name)->peer_id);
 		std::string ip_str = addr.serializeString();
 		getServer(L)->setIpBanned(ip_str, name);
-	}
-	catch(con::PeerNotFoundException) // unlikely
-	{
+	} catch(const con::PeerNotFoundException &) {
 		dstream << FUNCTION_NAME << ": peer was not found" << std::endl;
 		lua_pushboolean(L, false); // error
 		return 1;
@@ -478,7 +471,7 @@ int ModApiServer::l_is_singleplayer(lua_State *L)
 int ModApiServer::l_notify_authentication_modified(lua_State *L)
 {
 	NO_MAP_LOCK_REQUIRED;
-	std::string name = "";
+	std::string name;
 	if(lua_isstring(L, 1))
 		name = lua_tostring(L, 1);
 	getServer(L)->reportPrivsModified(name);