Fixed various warnings about return values.

Author: computerquip

src/Application.h

@@ -9,11 +9,12 @@ namespace chesspp
 {
     class Application : public SFMLEvent
     {
+    protected:
+	Application(const Application&);
+        Application &operator=(const Application&);
+	    
     public:
-        Application() : running(true), display(sf::VideoMode(640, 640), "ChessPlusPlus") {}
-
-        Application(const Application&) {}
-        Application &operator=(const Application&) {}
+        Application() :  display(sf::VideoMode(640, 640), "ChessPlusPlus"), running(true) {}
 
         bool onInit();
         void onEvent(sf::Event *Event);

src/exception.h

@@ -7,12 +7,14 @@ namespace chesspp
 {
     class exception
     {
+    protected:
+	exception &operator=(const exception &) throw();
+	
     public:
         exception() throw() {}
         exception(const std::string &_e) throw() : e(_e) {}
         exception(const exception &) throw() {}
-        exception &operator=(const exception &) throw() {}
-        virtual ~exception() throw() {}
+        virtual ~exception() throw() {};
 
         virtual std::string what() const throw() {return e;}
     private: