return value, not const reference, if return type is POD or ptr

returning reference to POD types can be in fact slower than returning value.

src/screen.h

@@ -33,7 +33,7 @@ class BasicScreen
 		BasicScreen() : hasToBeResized(0) { }
 		virtual ~BasicScreen() { }
 		
-		virtual void *&Cmp() = 0;
+		virtual void *Cmp() = 0;
 		
 		virtual void Init() = 0;
 		virtual void SwitchTo() = 0;
@@ -69,9 +69,9 @@ template <class WindowType> class Screen : public BasicScreen
 		Screen() : w(0) { }
 		virtual ~Screen() { }
 		
-		virtual void *&Cmp();
+		virtual void *Cmp();
 		
-		WindowType *&Main();
+		WindowType *Main();
 		
 		virtual void Refresh();
 		virtual void RefreshWindow();
@@ -82,12 +82,12 @@ template <class WindowType> class Screen : public BasicScreen
 		WindowType *w;
 };
 
-template <class WindowType> void *&Screen<WindowType>::Cmp()
+template <class WindowType> void *Screen<WindowType>::Cmp()
 {
-	return *(void **)(void *)&w;
+	return w;
 }
 
-template <class WindowType> WindowType *&Screen<WindowType>::Main()
+template <class WindowType> WindowType *Screen<WindowType>::Main()
 {
 	return w;
 }

src/window.cpp

@@ -540,12 +540,12 @@ void Window::GotoXY(int x, int y)
 	itsY = y;
 }
 
-const int &Window::X() const
+ int Window::X() const
 {
 	return itsX;
 }
 
-const int &Window::Y() const
+int Window::Y() const
 {
 	return itsY;
 }

src/window.h

@@ -93,8 +93,8 @@ namespace NCurses
 			std::string GetString(size_t length = -1, size_t width = 0, bool encrypted = 0) const { return GetString("", length, width, encrypted); }
 			void GetXY(int &, int &);
 			void GotoXY(int, int);
-			const int &X() const;
+			int X() const;
-			const int &Y() const;
+			int Y() const;
 			
 			void SetGetStringHelper(GetStringHelper helper) { itsGetStringHelper = helper; }
 			void SetColor(Color, Color = clDefault);