25 files changed, 183 insertions, 183 deletions

diff --git a/src/client/joystick_controller.cpp b/src/client/joystick_controller.cpp
index 3e1442793..cb9d64b9f 100644
--- a/src/client/joystick_controller.cpp
+++ b/src/client/joystick_controller.cpp
@@ -185,7 +185,8 @@ void JoystickController::onJoystickConnect(const std::vector<irr::SJoystickInfo>
 	m_joystick_id = id;
 }
 
-void JoystickController::setLayoutFromControllerName(std::string name) {
+void JoystickController::setLayoutFromControllerName(const std::string &name)
+{
 	if (lowercase(name).find("xbox") != std::string::npos) {
 		m_layout = create_xbox_layout();
 	} else {
diff --git a/src/client/joystick_controller.h b/src/client/joystick_controller.h
index 867a0c3f2..2c0e7b90a 100644
--- a/src/client/joystick_controller.h
+++ b/src/client/joystick_controller.h
@@ -149,7 +149,7 @@ public:
 	f32 doubling_dtime;
 
 private:
-	void setLayoutFromControllerName(std::string name);
+	void setLayoutFromControllerName(const std::string &name);
 
 	JoystickLayout m_layout;
 
diff --git a/src/clientiface.h b/src/clientiface.h
index 403cd0420..11ebdaab6 100644
--- a/src/clientiface.h
+++ b/src/clientiface.h
@@ -324,14 +324,11 @@ public:
 	*/
 	std::set<u16> m_known_objects;
 
-	ClientState getState()
-		{ return m_state; }
+	ClientState getState() const { return m_state; }
 
-	std::string getName()
-		{ return m_name; }
+	std::string getName() const { return m_name; }
 
-	void setName(std::string name)
-		{ m_name = name; }
+	void setName(const std::string &name) { m_name = name; }
 
 	/* update internal client state */
 	void notifyEvent(ClientStateEvent event);
@@ -350,7 +347,8 @@ public:
 	u32 uptime();
 
 	/* set version information */
-	void setVersionInfo(u8 major, u8 minor, u8 patch, std::string full) {
+	void setVersionInfo(u8 major, u8 minor, u8 patch, const std::string &full)
+	{
 		m_version_major = major;
 		m_version_minor = minor;
 		m_version_patch = patch;
@@ -358,10 +356,10 @@ public:
 	}
 
 	/* read version information */
-	u8 getMajor() { return m_version_major; }
-	u8 getMinor() { return m_version_minor; }
-	u8 getPatch() { return m_version_patch; }
-	std::string getVersion() { return m_full_version; }
+	u8 getMajor() const { return m_version_major; }
+	u8 getMinor() const { return m_version_minor; }
+	u8 getPatch() const { return m_version_patch; }
+	std::string getVersion() const { return m_full_version; }
 private:
 	// Version is stored in here after INIT before INIT2
 	u8 m_pending_serialization_version;
diff --git a/src/genericobject.cpp b/src/genericobject.cpp
index 07d2445b4..58f4b997e 100644
--- a/src/genericobject.cpp
+++ b/src/genericobject.cpp
@@ -68,7 +68,7 @@ std::string gob_cmd_update_position(
 std::string gob_cmd_set_texture_mod(const std::string &mod)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_SET_TEXTURE_MOD);
 	// parameters
 	os<<serializeString(mod);
@@ -95,7 +95,7 @@ std::string gob_cmd_set_sprite(
 std::string gob_cmd_punched(s16 damage, s16 result_hp)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_PUNCHED);
 	// damage
 	writeS16(os, damage);
@@ -121,7 +121,7 @@ std::string gob_cmd_update_physics_override(float physics_override_speed, float
 		float physics_override_gravity, bool sneak, bool sneak_glitch, bool new_move)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_SET_PHYSICS_OVERRIDE);
 	// parameters
 	writeF1000(os, physics_override_speed);
@@ -137,7 +137,7 @@ std::string gob_cmd_update_physics_override(float physics_override_speed, float
 std::string gob_cmd_update_animation(v2f frames, float frame_speed, float frame_blend, bool frame_loop)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_SET_ANIMATION);
 	// parameters
 	writeV2F1000(os, frames);
@@ -148,10 +148,11 @@ std::string gob_cmd_update_animation(v2f frames, float frame_speed, float frame_
 	return os.str();
 }
 
-std::string gob_cmd_update_bone_position(std::string bone, v3f position, v3f rotation)
+std::string gob_cmd_update_bone_position(const std::string &bone, v3f position,
+		v3f rotation)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_SET_BONE_POSITION);
 	// parameters
 	os<<serializeString(bone);
@@ -160,10 +161,11 @@ std::string gob_cmd_update_bone_position(std::string bone, v3f position, v3f rot
 	return os.str();
 }
 
-std::string gob_cmd_update_attachment(int parent_id, std::string bone, v3f position, v3f rotation)
+std::string gob_cmd_update_attachment(int parent_id, const std::string &bone,
+		v3f position, v3f rotation)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_ATTACH_TO);
 	// parameters
 	writeS16(os, parent_id);
@@ -184,10 +186,11 @@ std::string gob_cmd_update_nametag_attributes(video::SColor color)
 	return os.str();
 }
 
-std::string gob_cmd_update_infant(u16 id, u8 type, std::string client_initialization_data)
+std::string gob_cmd_update_infant(u16 id, u8 type,
+		const std::string &client_initialization_data)
 {
 	std::ostringstream os(std::ios::binary);
-	// command 
+	// command
 	writeU8(os, GENERIC_CMD_SPAWN_INFANT);
 	// parameters
 	writeU16(os, id);
diff --git a/src/genericobject.h b/src/genericobject.h
index 7d2ec4b14..d82650f0e 100644
--- a/src/genericobject.h
+++ b/src/genericobject.h
@@ -73,13 +73,16 @@ std::string gob_cmd_update_physics_override(float physics_override_speed,
 
 std::string gob_cmd_update_animation(v2f frames, float frame_speed, float frame_blend, bool frame_loop);
 
-std::string gob_cmd_update_bone_position(std::string bone, v3f position, v3f rotation);
+std::string gob_cmd_update_bone_position(const std::string &bone, v3f position,
+		v3f rotation);
 
-std::string gob_cmd_update_attachment(int parent_id, std::string bone, v3f position, v3f rotation);
+std::string gob_cmd_update_attachment(int parent_id, const std::string &bone,
+		v3f position, v3f rotation);
 
 std::string gob_cmd_update_nametag_attributes(video::SColor color);
 
-std::string gob_cmd_update_infant(u16 id, u8 type, std::string client_initialization_data);
+std::string gob_cmd_update_infant(u16 id, u8 type,
+		const std::string &client_initialization_data);
 
 #endif
 
diff --git a/src/guiEngine.cpp b/src/guiEngine.cpp
index 03fee6b96..e0ee00ad6 100644
--- a/src/guiEngine.cpp
+++ b/src/guiEngine.cpp
@@ -602,8 +602,8 @@ void GUIEngine::stopSound(s32 handle)
 }
 
 /******************************************************************************/
-unsigned int GUIEngine::queueAsync(std::string serialized_func,
-		std::string serialized_params)
+unsigned int GUIEngine::queueAsync(const std::string &serialized_func,
+		const std::string &serialized_params)
 {
 	return m_script->queueAsync(serialized_func, serialized_params);
 }
diff --git a/src/guiEngine.h b/src/guiEngine.h
index a81813d18..98e88574c 100644
--- a/src/guiEngine.h
+++ b/src/guiEngine.h
@@ -178,7 +178,8 @@ public:
 	}
 
 	/** pass async callback to scriptengine **/
-	unsigned int queueAsync(std::string serialized_fct,std::string serialized_params);
+	unsigned int queueAsync(const std::string &serialized_fct,
+			const std::string &serialized_params);
 
 private:
 
@@ -188,9 +189,6 @@ private:
 	/** run main menu loop */
 	void run();
 
-	/** handler to limit frame rate within main menu */
-	void limitFrameRate();
-
 	/** update size of topleftext element */
 	void updateTopLeftTextSize();
 
diff --git a/src/guiFormSpecMenu.cpp b/src/guiFormSpecMenu.cpp
index 3fe3c5cc2..ab93aeca1 100644
--- a/src/guiFormSpecMenu.cpp
+++ b/src/guiFormSpecMenu.cpp
@@ -252,7 +252,7 @@ std::vector<std::string>* GUIFormSpecMenu::getDropDownValues(const std::string &
 	return NULL;
 }
 
-void GUIFormSpecMenu::parseSize(parserData* data,std::string element)
+void GUIFormSpecMenu::parseSize(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,',');
 
@@ -278,7 +278,7 @@ void GUIFormSpecMenu::parseSize(parserData* data,std::string element)
 	errorstream<< "Invalid size element (" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseContainer(parserData* data, std::string element)
+void GUIFormSpecMenu::parseContainer(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element, ',');
 
@@ -304,7 +304,7 @@ void GUIFormSpecMenu::parseContainerEnd(parserData* data)
 	}
 }
 
-void GUIFormSpecMenu::parseList(parserData* data,std::string element)
+void GUIFormSpecMenu::parseList(parserData* data, const std::string &element)
 {
 	if (m_client == 0) {
 		warningstream<<"invalid use of 'list' with m_client==0"<<std::endl;
@@ -359,7 +359,7 @@ void GUIFormSpecMenu::parseList(parserData* data,std::string element)
 	errorstream<< "Invalid list element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseListRing(parserData* data, std::string element)
+void GUIFormSpecMenu::parseListRing(parserData* data, const std::string &element)
 {
 	if (m_client == 0) {
 		errorstream << "WARNING: invalid use of 'listring' with m_client==0" << std::endl;
@@ -394,7 +394,7 @@ void GUIFormSpecMenu::parseListRing(parserData* data, std::string element)
 		<< m_inventorylists.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseCheckbox(parserData* data,std::string element)
+void GUIFormSpecMenu::parseCheckbox(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -450,7 +450,7 @@ void GUIFormSpecMenu::parseCheckbox(parserData* data,std::string element)
 	errorstream<< "Invalid checkbox element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseScrollBar(parserData* data, std::string element)
+void GUIFormSpecMenu::parseScrollBar(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -509,7 +509,7 @@ void GUIFormSpecMenu::parseScrollBar(parserData* data, std::string element)
 	errorstream<< "Invalid scrollbar element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseImage(parserData* data,std::string element)
+void GUIFormSpecMenu::parseImage(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -553,7 +553,7 @@ void GUIFormSpecMenu::parseImage(parserData* data,std::string element)
 	errorstream<< "Invalid image element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseItemImage(parserData* data,std::string element)
+void GUIFormSpecMenu::parseItemImage(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -583,8 +583,8 @@ void GUIFormSpecMenu::parseItemImage(parserData* data,std::string element)
 	errorstream<< "Invalid ItemImage element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseButton(parserData* data,std::string element,
-		std::string type)
+void GUIFormSpecMenu::parseButton(parserData* data, const std::string &element,
+		const std::string &type)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -638,7 +638,7 @@ void GUIFormSpecMenu::parseButton(parserData* data,std::string element,
 	errorstream<< "Invalid button element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseBackground(parserData* data,std::string element)
+void GUIFormSpecMenu::parseBackground(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -676,7 +676,7 @@ void GUIFormSpecMenu::parseBackground(parserData* data,std::string element)
 	errorstream<< "Invalid background element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseTableOptions(parserData* data,std::string element)
+void GUIFormSpecMenu::parseTableOptions(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -688,7 +688,7 @@ void GUIFormSpecMenu::parseTableOptions(parserData* data,std::string element)
 	}
 }
 
-void GUIFormSpecMenu::parseTableColumns(parserData* data,std::string element)
+void GUIFormSpecMenu::parseTableColumns(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -708,7 +708,7 @@ void GUIFormSpecMenu::parseTableColumns(parserData* data,std::string element)
 	}
 }
 
-void GUIFormSpecMenu::parseTable(parserData* data,std::string element)
+void GUIFormSpecMenu::parseTable(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -776,7 +776,7 @@ void GUIFormSpecMenu::parseTable(parserData* data,std::string element)
 	errorstream<< "Invalid table element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseTextList(parserData* data,std::string element)
+void GUIFormSpecMenu::parseTextList(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -849,7 +849,7 @@ void GUIFormSpecMenu::parseTextList(parserData* data,std::string element)
 }
 
 
-void GUIFormSpecMenu::parseDropDown(parserData* data,std::string element)
+void GUIFormSpecMenu::parseDropDown(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -913,8 +913,7 @@ void GUIFormSpecMenu::parseDropDown(parserData* data,std::string element)
 				<< element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseFieldCloseOnEnter(parserData *data,
-		const std::string &element)
+void GUIFormSpecMenu::parseFieldCloseOnEnter(parserData *data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 	if (parts.size() == 2 ||
@@ -923,7 +922,7 @@ void GUIFormSpecMenu::parseFieldCloseOnEnter(parserData *data,
 	}
 }
 
-void GUIFormSpecMenu::parsePwdField(parserData* data,std::string element)
+void GUIFormSpecMenu::parsePwdField(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1084,8 +1083,8 @@ void GUIFormSpecMenu::parseSimpleField(parserData* data,
 	m_fields.push_back(spec);
 }
 
-void GUIFormSpecMenu::parseTextArea(parserData* data,
-		std::vector<std::string>& parts,std::string type)
+void GUIFormSpecMenu::parseTextArea(parserData* data, std::vector<std::string>& parts,
+		const std::string &type)
 {
 
 	std::vector<std::string> v_pos = split(parts[0],',');
@@ -1196,8 +1195,8 @@ void GUIFormSpecMenu::parseTextArea(parserData* data,
 	m_fields.push_back(spec);
 }
 
-void GUIFormSpecMenu::parseField(parserData* data,std::string element,
-		std::string type)
+void GUIFormSpecMenu::parseField(parserData* data, const std::string &element,
+		const std::string &type)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1215,7 +1214,7 @@ void GUIFormSpecMenu::parseField(parserData* data,std::string element,
 	errorstream<< "Invalid field element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseLabel(parserData* data,std::string element)
+void GUIFormSpecMenu::parseLabel(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1271,7 +1270,7 @@ void GUIFormSpecMenu::parseLabel(parserData* data,std::string element)
 	errorstream<< "Invalid label element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseVertLabel(parserData* data,std::string element)
+void GUIFormSpecMenu::parseVertLabel(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1321,8 +1320,8 @@ void GUIFormSpecMenu::parseVertLabel(parserData* data,std::string element)
 	errorstream<< "Invalid vertlabel element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseImageButton(parserData* data,std::string element,
-		std::string type)
+void GUIFormSpecMenu::parseImageButton(parserData* data, const std::string &element,
+		const std::string &type)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1410,7 +1409,7 @@ void GUIFormSpecMenu::parseImageButton(parserData* data,std::string element,
 	errorstream<< "Invalid imagebutton element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseTabHeader(parserData* data,std::string element)
+void GUIFormSpecMenu::parseTabHeader(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1482,7 +1481,7 @@ void GUIFormSpecMenu::parseTabHeader(parserData* data,std::string element)
 			<< element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseItemImageButton(parserData* data,std::string element)
+void GUIFormSpecMenu::parseItemImageButton(parserData* data, const std::string &element)
 {
 
 	if (m_client == 0) {
@@ -1556,7 +1555,7 @@ void GUIFormSpecMenu::parseItemImageButton(parserData* data,std::string element)
 	errorstream<< "Invalid ItemImagebutton element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseBox(parserData* data,std::string element)
+void GUIFormSpecMenu::parseBox(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1592,7 +1591,7 @@ void GUIFormSpecMenu::parseBox(parserData* data,std::string element)
 	errorstream<< "Invalid Box element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseBackgroundColor(parserData* data,std::string element)
+void GUIFormSpecMenu::parseBackgroundColor(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1610,7 +1609,7 @@ void GUIFormSpecMenu::parseBackgroundColor(parserData* data,std::string element)
 	errorstream<< "Invalid bgcolor element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseListColors(parserData* data,std::string element)
+void GUIFormSpecMenu::parseListColors(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 
@@ -1638,7 +1637,7 @@ void GUIFormSpecMenu::parseListColors(parserData* data,std::string element)
 	errorstream<< "Invalid listcolors element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-void GUIFormSpecMenu::parseTooltip(parserData* data, std::string element)
+void GUIFormSpecMenu::parseTooltip(parserData* data, const std::string &element)
 {
 	std::vector<std::string> parts = split(element,';');
 	if (parts.size() == 2) {
@@ -1658,7 +1657,7 @@ void GUIFormSpecMenu::parseTooltip(parserData* data, std::string element)
 	errorstream<< "Invalid tooltip element(" << parts.size() << "): '" << element << "'"  << std::endl;
 }
 
-bool GUIFormSpecMenu::parseVersionDirect(std::string data)
+bool GUIFormSpecMenu::parseVersionDirect(const std::string &data)
 {
 	//some prechecks
 	if (data == "")
@@ -1682,7 +1681,7 @@ bool GUIFormSpecMenu::parseVersionDirect(std::string data)
 	return false;
 }
 
-bool GUIFormSpecMenu::parseSizeDirect(parserData* data, std::string element)
+bool GUIFormSpecMenu::parseSizeDirect(parserData* data, const std::string &element)
 {
 	if (element == "")
 		return false;
diff --git a/src/guiFormSpecMenu.h b/src/guiFormSpecMenu.h
index f4383e987..4bc2448d8 100644
--- a/src/guiFormSpecMenu.h
+++ b/src/guiFormSpecMenu.h
@@ -471,39 +471,41 @@ private:
 
 	void parseElement(parserData* data, std::string element);
 
-	void parseSize(parserData* data, std::string element);
-	void parseContainer(parserData* data, std::string element);
+	void parseSize(parserData* data, const std::string &element);
+	void parseContainer(parserData* data, const std::string &element);
 	void parseContainerEnd(parserData* data);
-	void parseList(parserData* data, std::string element);
-	void parseListRing(parserData* data, std::string element);
-	void parseCheckbox(parserData* data, std::string element);
-	void parseImage(parserData* data, std::string element);
-	void parseItemImage(parserData* data,std::string element);
-	void parseButton(parserData* data,std::string element,std::string typ);
-	void parseBackground(parserData* data,std::string element);
-	void parseTableOptions(parserData* data,std::string element);
-	void parseTableColumns(parserData* data,std::string element);
-	void parseTable(parserData* data,std::string element);
-	void parseTextList(parserData* data,std::string element);
-	void parseDropDown(parserData* data,std::string element);
+	void parseList(parserData* data, const std::string &element);
+	void parseListRing(parserData* data, const std::string &element);
+	void parseCheckbox(parserData* data, const std::string &element);
+	void parseImage(parserData* data, const std::string &element);
+	void parseItemImage(parserData* data, const std::string &element);
+	void parseButton(parserData* data, const std::string &element,
+			const std::string &typ);
+	void parseBackground(parserData* data, const std::string &element);
+	void parseTableOptions(parserData* data, const std::string &element);
+	void parseTableColumns(parserData* data, const std::string &element);
+	void parseTable(parserData* data, const std::string &element);
+	void parseTextList(parserData* data, const std::string &element);
+	void parseDropDown(parserData* data, const std::string &element);
 	void parseFieldCloseOnEnter(parserData *data, const std::string &element);
-	void parsePwdField(parserData* data,std::string element);
-	void parseField(parserData* data,std::string element,std::string type);
+	void parsePwdField(parserData* data, const std::string &element);
+	void parseField(parserData* data, const std::string &element, const std::string &type);
 	void parseSimpleField(parserData* data,std::vector<std::string> &parts);
 	void parseTextArea(parserData* data,std::vector<std::string>& parts,
-			std::string type);
-	void parseLabel(parserData* data,std::string element);
-	void parseVertLabel(parserData* data,std::string element);
-	void parseImageButton(parserData* data,std::string element,std::string type);
-	void parseItemImageButton(parserData* data,std::string element);
-	void parseTabHeader(parserData* data,std::string element);
-	void parseBox(parserData* data,std::string element);
-	void parseBackgroundColor(parserData* data,std::string element);
-	void parseListColors(parserData* data,std::string element);
-	void parseTooltip(parserData* data,std::string element);
-	bool parseVersionDirect(std::string data);
-	bool parseSizeDirect(parserData* data, std::string element);
-	void parseScrollBar(parserData* data, std::string element);
+			const std::string &type);
+	void parseLabel(parserData* data, const std::string &element);
+	void parseVertLabel(parserData* data, const std::string &element);
+	void parseImageButton(parserData* data, const std::string &element,
+			const std::string &type);
+	void parseItemImageButton(parserData* data, const std::string &element);
+	void parseTabHeader(parserData* data, const std::string &element);
+	void parseBox(parserData* data, const std::string &element);
+	void parseBackgroundColor(parserData* data, const std::string &element);
+	void parseListColors(parserData* data, const std::string &element);
+	void parseTooltip(parserData* data, const std::string &element);
+	bool parseVersionDirect(const std::string &data);
+	bool parseSizeDirect(parserData* data, const std::string &element);
+	void parseScrollBar(parserData* data, const std::string &element);
 	bool parsePositionDirect(parserData *data, const std::string &element);
 	void parsePosition(parserData *data, const std::string &element);
 	bool parseAnchorDirect(parserData *data, const std::string &element);
diff --git a/src/guiTable.h b/src/guiTable.h
index 4d5b39166..9fbe1c9da 100644
--- a/src/guiTable.h
+++ b/src/guiTable.h
@@ -74,11 +74,10 @@ public:
 		std::string name;
 		std::string value;
 
-		Option(const std::string &name_, const std::string &value_)
-		{
-			name = name_;
-			value = value_;
-		}
+		Option(const std::string &name_, const std::string &value_) :
+			name(name_),
+			value(value_)
+		{}
 	};
 
 	/*
diff --git a/src/httpfetch.cpp b/src/httpfetch.cpp
index 21400355a..3b3f5d331 100644
--- a/src/httpfetch.cpp
+++ b/src/httpfetch.cpp
@@ -40,16 +40,15 @@ Mutex g_httpfetch_mutex;
 std::map<unsigned long, std::queue<HTTPFetchResult> > g_httpfetch_results;
 PcgRandom g_callerid_randomness;
 
-HTTPFetchRequest::HTTPFetchRequest()
+HTTPFetchRequest::HTTPFetchRequest() :
+	url(""),
+	caller(HTTPFETCH_DISCARD),
+	request_id(0),
+	timeout(g_settings->getS32("curl_timeout")),
+	connect_timeout(timeout),
+	multipart(false),
+	useragent(std::string(PROJECT_NAME_C "/") + g_version_hash + " (" + porting::get_sysinfo() + ")")
 {
-	url = "";
-	caller = HTTPFETCH_DISCARD;
-	request_id = 0;
-	timeout = g_settings->getS32("curl_timeout");
-	connect_timeout = timeout;
-	multipart = false;
-
-	useragent = std::string(PROJECT_NAME_C "/") + g_version_hash + " (" + porting::get_sysinfo() + ")";
 }
 
 
diff --git a/src/httpfetch.h b/src/httpfetch.h
index f57ed8789..d64b80b66 100644
--- a/src/httpfetch.h
+++ b/src/httpfetch.h
@@ -77,25 +77,23 @@ struct HTTPFetchResult
 	unsigned long caller;
 	unsigned long request_id;
 
-	HTTPFetchResult()
-	{
-		succeeded = false;
-		timeout = false;
-		response_code = 0;
-		data = "";
-		caller = HTTPFETCH_DISCARD;
-		request_id = 0;
-	}
-
-	HTTPFetchResult(const HTTPFetchRequest &fetch_request)
-	{
-		succeeded = false;
-		timeout = false;
-		response_code = 0;
-		data = "";
-		caller = fetch_request.caller;
-		request_id = fetch_request.request_id;
-	}
+	HTTPFetchResult() :
+		succeeded(false),
+		timeout(false),
+		response_code(0),
+		data(""),
+		caller(HTTPFETCH_DISCARD),
+		request_id(0)
+	{}
+
+	HTTPFetchResult(const HTTPFetchRequest &fetch_request) :
+		succeeded(false),
+		timeout(false),
+		response_code(0),
+		data(""),
+		caller(fetch_request.caller),
+		request_id(fetch_request.request_id)
+	{}
 
 };
 
diff --git a/src/map.cpp b/src/map.cpp
index 3da96e77b..f8bbee180 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -2347,16 +2347,15 @@ bool ServerMap::saveBlock(MapBlock *block, Database *db)
 	return ret;
 }
 
-void ServerMap::loadBlock(std::string sectordir, std::string blockfile,
+void ServerMap::loadBlock(const std::string &sectordir, const std::string &blockfile,
 		MapSector *sector, bool save_after_load)
 {
 	DSTACK(FUNCTION_NAME);
 
 	std::string fullpath = sectordir + DIR_DELIM + blockfile;
 	try {
-
 		std::ifstream is(fullpath.c_str(), std::ios_base::binary);
-		if(is.good() == false)
+		if (!is.good())
 			throw FileNotGoodException("Cannot open block file");
 
 		v3s16 p3d = getBlockPos(sectordir, blockfile);
diff --git a/src/map.h b/src/map.h
index 90f97db8b..744a4d1e2 100644
--- a/src/map.h
+++ b/src/map.h
@@ -456,17 +456,11 @@ public:
 	MapSector* loadSectorMeta(std::string dirname, bool save_after_load);
 	bool loadSectorMeta(v2s16 p2d);
 
-	// Full load of a sector including all blocks.
-	// returns true on success, false on failure.
-	bool loadSectorFull(v2s16 p2d);
-	// If sector is not found in memory, try to load it from disk.
-	// Returns true if sector now resides in memory
-	//bool deFlushSector(v2s16 p2d);
-
 	bool saveBlock(MapBlock *block);
 	static bool saveBlock(MapBlock *block, Database *db);
 	// This will generate a sector with getSector if not found.
-	void loadBlock(std::string sectordir, std::string blockfile, MapSector *sector, bool save_after_load=false);
+	void loadBlock(const std::string &sectordir, const std::string &blockfile,
+			MapSector *sector, bool save_after_load=false);
 	MapBlock* loadBlock(v3s16 p);
 	// Database version
 	void loadBlock(std::string *blob, v3s16 p3d, MapSector *sector, bool save_after_load=false);
diff --git a/src/network/connection.h b/src/network/connection.h
index 5ee53b9d4..7ba0d086e 100644
--- a/src/network/connection.h
+++ b/src/network/connection.h
@@ -383,7 +383,7 @@ struct OutgoingPacket
 	bool reliable;
 	bool ack;
 
-	OutgoingPacket(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_,
+	OutgoingPacket(u16 peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_,
 			bool reliable_,bool ack_=false):
 		peer_id(peer_id_),
 		channelnum(channelnum_),
@@ -448,7 +448,7 @@ struct ConnectionCommand
 		reliable = reliable_;
 	}
 
-	void ack(u16 peer_id_, u8 channelnum_, SharedBuffer<u8> data_)
+	void ack(u16 peer_id_, u8 channelnum_, const SharedBuffer<u8> &data_)
 	{
 		type = CONCMD_ACK;
 		peer_id = peer_id_;
@@ -457,7 +457,7 @@ struct ConnectionCommand
 		reliable = false;
 	}
 
-	void createPeer(u16 peer_id_, SharedBuffer<u8> data_)
+	void createPeer(u16 peer_id_, const SharedBuffer<u8> &data_)
 	{
 		type = CONCMD_CREATE_PEER;
 		peer_id = peer_id_;
@@ -467,7 +467,7 @@ struct ConnectionCommand
 		raw = true;
 	}
 
-	void disableLegacy(u16 peer_id_, SharedBuffer<u8> data_)
+	void disableLegacy(u16 peer_id_, const SharedBuffer<u8> &data_)
 	{
 		type = CONCMD_DISABLE_LEGACY;
 		peer_id = peer_id_;
@@ -874,7 +874,7 @@ struct ConnectionEvent
 		return "Invalid ConnectionEvent";
 	}
 
-	void dataReceived(u16 peer_id_, SharedBuffer<u8> data_)
+	void dataReceived(u16 peer_id_, const SharedBuffer<u8> &data_)
 	{
 		type = CONNEVENT_DATA_RECEIVED;
 		peer_id = peer_id_;
diff --git a/src/nodedef.h b/src/nodedef.h
index da3345d80..83968ce27 100644
--- a/src/nodedef.h
+++ b/src/nodedef.h
@@ -218,14 +218,14 @@ struct TileDef
 
 	struct TileAnimationParams animation;
 
-	TileDef()
+	TileDef() :
+		name(""),
+		backface_culling(true),
+		tileable_horizontal(true),
+		tileable_vertical(true),
+		has_color(false),
+		color(video::SColor(0xFFFFFFFF))
 	{
-		name = "";
-		backface_culling = true;
-		tileable_horizontal = true;
-		tileable_vertical = true;
-		has_color = false;
-		color = video::SColor(0xFFFFFFFF);
 		animation.type = TAT_NONE;
 	}
 
diff --git a/src/pathfinder.cpp b/src/pathfinder.cpp
index ee06db630..16c5678ee 100644
--- a/src/pathfinder.cpp
+++ b/src/pathfinder.cpp
@@ -111,7 +111,7 @@ public:
 	 * @param dir direction to set cost for
 	 * @cost cost to set
 	 */
-	void      setCost(v3s16 dir, PathCost cost);
+	void      setCost(v3s16 dir, const PathCost &cost);
 
 	bool      valid;               /**< node is on surface                    */
 	bool      target;              /**< node is target position               */
@@ -496,7 +496,7 @@ PathCost PathGridnode::getCost(v3s16 dir)
 }
 
 /******************************************************************************/
-void PathGridnode::setCost(v3s16 dir, PathCost cost)
+void PathGridnode::setCost(v3s16 dir, const PathCost &cost)
 {
 	if (dir.X > 0) {
 		directions[DIR_XP] = cost;
diff --git a/src/porting.cpp b/src/porting.cpp
index 9d859da7d..8c92a3cba 100644
--- a/src/porting.cpp
+++ b/src/porting.cpp
@@ -408,7 +408,7 @@ bool setSystemPaths()
 #endif
 
 	for (std::list<std::string>::const_iterator
-			i = trylist.begin(); i != trylist.end(); i++) {
+			i = trylist.begin(); i != trylist.end(); ++i) {
 		const std::string &trypath = *i;
 		if (!fs::PathExists(trypath) ||
 			!fs::PathExists(trypath + DIR_DELIM + "builtin")) {
diff --git a/src/script/cpp_api/s_async.cpp b/src/script/cpp_api/s_async.cpp
index 1fb84fab6..a1bec83bf 100644
--- a/src/script/cpp_api/s_async.cpp
+++ b/src/script/cpp_api/s_async.cpp
@@ -100,7 +100,8 @@ void AsyncEngine::initialize(unsigned int numEngines)
 }
 
 /******************************************************************************/
-unsigned int AsyncEngine::queueAsyncJob(std::string func, std::string params)
+unsigned int AsyncEngine::queueAsyncJob(const std::string &func,
+		const std::string &params)
 {
 	jobQueueMutex.lock();
 	LuaJobInfo toAdd;
@@ -124,7 +125,6 @@ LuaJobInfo AsyncEngine::getJob()
 	jobQueueMutex.lock();
 
 	LuaJobInfo retval;
-	retval.valid = false;
 
 	if (!jobQueue.empty()) {
 		retval = jobQueue.front();
@@ -137,7 +137,7 @@ LuaJobInfo AsyncEngine::getJob()
 }
 
 /******************************************************************************/
-void AsyncEngine::putJobResult(LuaJobInfo result)
+void AsyncEngine::putJobResult(const LuaJobInfo &result)
 {
 	resultQueueMutex.lock();
 	resultQueue.push_back(result);
@@ -264,7 +264,7 @@ void* AsyncWorkerThread::run()
 		// Wait for job
 		LuaJobInfo toProcess = jobDispatcher->getJob();
 
-		if (toProcess.valid == false || stopRequested()) {
+		if (!toProcess.valid || stopRequested()) {
 			continue;
 		}
 
diff --git a/src/script/cpp_api/s_async.h b/src/script/cpp_api/s_async.h
index 016381e5f..93e9759b4 100644
--- a/src/script/cpp_api/s_async.h
+++ b/src/script/cpp_api/s_async.h
@@ -38,7 +38,16 @@ class AsyncEngine;
 // Declarations
 
 // Data required to queue a job
-struct LuaJobInfo {
+struct LuaJobInfo
+{
+	LuaJobInfo() :
+		serializedFunction(""),
+		serializedParams(""),
+		serializedResult(""),
+		id(0),
+		valid(false)
+	{}
+
 	// Function to be called in async environment
 	std::string serializedFunction;
 	// Parameter to be passed to function
@@ -89,7 +98,7 @@ public:
 	 * @param params Serialized parameters
 	 * @return jobid The job is queued
 	 */
-	unsigned int queueAsyncJob(std::string func, std::string params);
+	unsigned int queueAsyncJob(const std::string &func, const std::string &params);
 
 	/**
 	 * Engine step to process finished jobs
@@ -116,7 +125,7 @@ protected:
 	 * Put a Job result back to result queue
 	 * @param result result of completed job
 	 */
-	void putJobResult(LuaJobInfo result);
+	void putJobResult(const LuaJobInfo &result);
 
 	/**
 	 * Initialize environment with current registred functions
diff --git a/src/script/scripting_mainmenu.cpp b/src/script/scripting_mainmenu.cpp
index 61318735d..d79864a95 100644
--- a/src/script/scripting_mainmenu.cpp
+++ b/src/script/scripting_mainmenu.cpp
@@ -77,13 +77,15 @@ void MainMenuScripting::initializeModApi(lua_State *L, int top)
 }
 
 /******************************************************************************/
-void MainMenuScripting::step() {
+void MainMenuScripting::step()
+{
 	asyncEngine.step(getStack());
 }
 
 /******************************************************************************/
-unsigned int MainMenuScripting::queueAsync(std::string serialized_func,
-		std::string serialized_param) {
+unsigned int MainMenuScripting::queueAsync(const std::string &serialized_func,
+		const std::string &serialized_param)
+{
 	return asyncEngine.queueAsyncJob(serialized_func, serialized_param);
 }
 
diff --git a/src/script/scripting_mainmenu.h b/src/script/scripting_mainmenu.h
index 3a0795df4..a1385ba9c 100644
--- a/src/script/scripting_mainmenu.h
+++ b/src/script/scripting_mainmenu.h
@@ -39,8 +39,8 @@ public:
 	void step();
 
 	// Pass async events from engine to async threads
-	unsigned int queueAsync(std::string serialized_func,
-			std::string serialized_params);
+	unsigned int queueAsync(const std::string &serialized_func,
+			const std::string &serialized_params);
 private:
 	void initializeModApi(lua_State *L, int top);
 
diff --git a/src/sound.h b/src/sound.h
index ba2d629d2..d13799eac 100644
--- a/src/sound.h
+++ b/src/sound.h
@@ -34,13 +34,15 @@ public:
 
 struct SimpleSoundSpec
 {
+	SimpleSoundSpec(const std::string &name = "", float gain = 1.0) :
+		name(name),
+		gain(gain)
+	{}
+
+	bool exists() const { return name != ""; }
+
 	std::string name;
 	float gain;
-	SimpleSoundSpec(std::string name = "", float gain = 1.0) : name(name), gain(gain)
-	{
-	}
-	bool exists() { return name != ""; }
-	// Serialization intentionally left out
 };
 
 class ISoundManager
diff --git a/src/util/string.h b/src/util/string.h
index 1a0b9f60d..632dd4d7e 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -232,7 +232,7 @@ inline std::vector<std::basic_string<T> > str_split(
  */
 inline std::string lowercase(const std::string &str)
 {
-	std::string s2;
+	std::string s2 = "";
 
 	s2.reserve(str.size());
 
diff --git a/src/util/thread.h b/src/util/thread.h
index d43e06e0a..f54b8b48f 100644
--- a/src/util/thread.h
+++ b/src/util/thread.h
@@ -29,9 +29,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "container.h"
 
 template<typename T>
-class MutexedVariable {
+class MutexedVariable
+{
 public:
-	MutexedVariable(T value):
+	MutexedVariable(const T &value):
 		m_value(value)
 	{}
 
@@ -41,21 +42,14 @@ public:
 		return m_value;
 	}
 
-	void set(T value)
+	void set(const T &value)
 	{
 		MutexAutoLock lock(m_mutex);
 		m_value = value;
 	}
 
-	// You'll want to grab this in a SharedPtr
-	MutexAutoLock *getLock()
-	{
-		return new MutexAutoLock(m_mutex);
-	}
-
 	// You pretty surely want to grab the lock when accessing this
 	T m_value;
-
 private:
 	Mutex m_mutex;
 };