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diff --git a/labb4/Unit.h b/labb4/Unit.h
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+++ b/labb4/Unit.h
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+/**
+ * Copyright (C) David Wolfe, 1999.  All rights reserved.
+ * Ported to Qt and adapted for TDDD86, 2015.
+ */
+
+#ifndef UNIT_H
+#define UNIT_H
+
+#include "utilities.h"
+
+/* Root class for all pieces on the board.
+ * Subclasses are Robot, Hero and Junk.
+ */
+class Unit {
+public:
+    Unit();
+    Unit(const Unit& u);
+    Unit(const Point& p);
+
+    /*
+    * Return Point representation of Unit
+    */
+    Point asPoint() const;
+
+    /*
+    * Am I in the same square as u?
+    */
+    bool at(const Unit& u) const;
+
+    /*
+    * Can I catch u in one move?
+    */
+    bool attacks(const Unit& u) const;
+
+    /*
+    * Take one step closer to u
+    */
+    void moveTowards(const Unit& u);
+
+    /*
+    * Teleport. Does not check for collision
+    */
+    void teleport();
+
+    /*
+    * Euclidean distance to u
+    */
+    double distanceTo(const Unit& u) const;
+private:
+    int x;  // x position of this unit
+    int y;  // y position of this unit
+
+    // private helpers
+    void checkBounds();
+};
+
+#endif // UNIT_H