6 files changed, 8 insertions, 8 deletions
diff --git a/src/gui/guiChatConsole.cpp b/src/gui/guiChatConsole.cpp
index 1ccb4e6d1..42348beb3 100644
--- a/src/gui/guiChatConsole.cpp
+++ b/src/gui/guiChatConsole.cpp
@@ -139,7 +139,7 @@ f32 GUIChatConsole::getDesiredHeight() const
 	return m_desired_height_fraction;
 }
 
-void GUIChatConsole::replaceAndAddToHistory(std::wstring line)
+void GUIChatConsole::replaceAndAddToHistory(const std::wstring &line)
 {
 	ChatPrompt& prompt = m_chat_backend->getPrompt();
 	prompt.addToHistory(prompt.getLine());
diff --git a/src/gui/guiChatConsole.h b/src/gui/guiChatConsole.h
index ef8a87673..7be40e27c 100644
--- a/src/gui/guiChatConsole.h
+++ b/src/gui/guiChatConsole.h
@@ -60,7 +60,7 @@ public:
 	f32 getDesiredHeight() const;
 
 	// Replace actual line when adding the actual to the history (if there is any)
-	void replaceAndAddToHistory(std::wstring line);
+	void replaceAndAddToHistory(const std::wstring &line);
 
 	// Change how the cursor looks
 	void setCursor(
diff --git a/src/gui/guiEngine.cpp b/src/gui/guiEngine.cpp
index 6030a5bfb..f0a8f40eb 100644
--- a/src/gui/guiEngine.cpp
+++ b/src/gui/guiEngine.cpp
@@ -518,7 +518,7 @@ void GUIEngine::drawFooter(video::IVideoDriver *driver)
 }
 
 /******************************************************************************/
-bool GUIEngine::setTexture(texture_layer layer, std::string texturepath,
+bool GUIEngine::setTexture(texture_layer layer, const std::string &texturepath,
 		bool tile_image, unsigned int minsize)
 {
 	video::IVideoDriver *driver = RenderingEngine::get_video_driver();
@@ -593,7 +593,7 @@ void GUIEngine::updateTopLeftTextSize()
 }
 
 /******************************************************************************/
-s32 GUIEngine::playSound(SimpleSoundSpec spec, bool looped)
+s32 GUIEngine::playSound(const SimpleSoundSpec &spec, bool looped)
 {
 	s32 handle = m_sound_manager->playSound(spec, looped);
 	return handle;
diff --git a/src/gui/guiEngine.h b/src/gui/guiEngine.h
index 409ba94c4..0ff5030c0 100644
--- a/src/gui/guiEngine.h
+++ b/src/gui/guiEngine.h
@@ -247,7 +247,7 @@ private:
 	 * @param layer draw layer to specify texture
 	 * @param texturepath full path of texture to load
 	 */
-	bool setTexture(texture_layer layer, std::string texturepath,
+	bool setTexture(texture_layer layer, const std::string &texturepath,
 			bool tile_image, unsigned int minsize);
 
 	/**
@@ -296,7 +296,7 @@ private:
 	clouddata   m_cloud;
 
 	/** start playing a sound and return handle */
-	s32 playSound(SimpleSoundSpec spec, bool looped);
+	s32 playSound(const SimpleSoundSpec &spec, bool looped);
 	/** stop playing a sound started with playSound() */
 	void stopSound(s32 handle);
 
diff --git a/src/gui/guiFormSpecMenu.cpp b/src/gui/guiFormSpecMenu.cpp
index 92e654765..e2aed420c 100644
--- a/src/gui/guiFormSpecMenu.cpp
+++ b/src/gui/guiFormSpecMenu.cpp
@@ -86,7 +86,7 @@ inline u32 clamp_u8(s32 value)
 GUIFormSpecMenu::GUIFormSpecMenu(JoystickController *joystick,
 		gui::IGUIElement *parent, s32 id, IMenuManager *menumgr,
 		Client *client, ISimpleTextureSource *tsrc, IFormSource *fsrc, TextDest *tdst,
-		std::string formspecPrepend,
+		const std::string &formspecPrepend,
 		bool remap_dbl_click):
 	GUIModalMenu(RenderingEngine::get_gui_env(), parent, id, menumgr),
 	m_invmgr(client),
diff --git a/src/gui/guiFormSpecMenu.h b/src/gui/guiFormSpecMenu.h
index d75a108d4..33f88d8c0 100644
--- a/src/gui/guiFormSpecMenu.h
+++ b/src/gui/guiFormSpecMenu.h
@@ -287,7 +287,7 @@ public:
 			ISimpleTextureSource *tsrc,
 			IFormSource* fs_src,
 			TextDest* txt_dst,
-			std::string formspecPrepend,
+			const std::string &formspecPrepend,
 			bool remap_dbl_click = true);
 
 	~GUIFormSpecMenu();