Base methods in unit

src/Junk.cpp

@@ -14,3 +14,8 @@ void Junk::draw(QGraphicsScene *scene) const {
     scene->addEllipse(QRectF(corner.x * UNIT_WIDTH, corner.y * UNIT_HEIGHT,
                              JUNK_RADIUS, JUNK_RADIUS), QPen(), QBrush(JUNK_COLOR));
 }
+
+bool Junk::isAlive() const { return false; }
+bool Junk::isToBeJunked() const { return false; }
+void Junk::doCrash() {}
+void Junk::moveTowards(const Point&) const {}

src/Junk.h

@@ -16,7 +16,12 @@ public:
     /*
     * Draws this junk onto the given QGraphicsScene.
     */
-    void draw(QGraphicsScene* scene) const;
+    void draw(QGraphicsScene *scene) const override;
+    bool isAlive() const override;
+    bool isToBeJunked() const override;
+    void doCrash() override;
+    void moveTowards(const Point&) const;
+
 };
 
 #endif // JUNK_H

src/Robot.cpp

@@ -10,13 +10,12 @@ bool Robot::isAlive() const{
     return !toBeJunked;
 }
 
-void Robot::doCrash(){
+void Robot::doCrash() {
     toBeJunked = true;
 }
 
-bool Robot::isToBeJunked() const{
+bool Robot::isToBeJunked() const {
     return toBeJunked;
-
 }
 
 

src/Robot.h

@@ -17,23 +17,22 @@ public:
     /*
      * did not crash yet
      */
-    bool isAlive() const;
+    bool isAlive() const override;
 
     /*
      * Crashes and remembers it
      */
-    void doCrash();
+    void doCrash() override;
 
     /*
      * Return whether the robot crashed
      */
-    bool isToBeJunked() const;
-
+    bool isToBeJunked() const override;
 
     /*
     * Draws this robot onto the given QGraphicsScene.
     */
-    void draw(QGraphicsScene* scene) const;
+    void draw(QGraphicsScene *scene) const override;
 
 
 };

src/Unit.cpp

@@ -57,3 +57,9 @@ void Unit::checkBounds() {
     if (y < MIN_Y) y = MIN_Y;
     if (y > MAX_Y) y = MAX_Y;
 }
+
+// Default implementation
+bool Unit::isAlive() const { return true; }
+bool Unit::isToBeJunked() const { return false; }
+void Unit::doCrash() {}
+void Unit::draw(QGraphicsScene *) const {}

src/Unit.h

@@ -42,7 +42,7 @@ public:
     /*
     * Take one step closer to point
     */
-    void moveTowards(const Point&);
+    virtual void moveTowards(const Point&);
 
 
     /*
@@ -54,6 +54,11 @@ public:
     * Euclidean distance to u
     */
     double distanceTo(const Unit& u) const;
+
+    virtual bool isAlive() const;
+    virtual bool isToBeJunked() const;
+    virtual void doCrash();
+    virtual void draw(QGraphicsScene *scene) const;
 private:
     int x;  // x position of this unit
     int y;  // y position of this unit