diff -r af75a1894a32 -r 5685602aeb9c src/proto2/GameState.hh
--- a/src/proto2/GameState.hh	Sun Nov 09 21:51:13 2008 +0000
+++ b/src/proto2/GameState.hh	Sun Nov 09 22:02:03 2008 +0000
@@ -16,13 +16,18 @@
 #define MAP_DIM_W 800
 #define MAP_DIM_H 640
 
+// forward-declare GameState
+class GameState;
+
 class Player {
     protected:
         Coordinate position;
 
+        GameState &state;
+
     public:
 
-        Player(Coordinate c, bool visible) : position(c), dimensions(PLAYER_DIM_W, PLAYER_DIM_H), visible(visible) {}
+        Player(GameState &state, Coordinate c, bool visible) : position(c), state(state), dimensions(PLAYER_DIM_W, PLAYER_DIM_H), visible(visible) {}
 
         PlayerType type;
         Dimension dimensions;
@@ -38,36 +43,23 @@
          *
          * Returns true if valid move (not out of bounds), false otherwise (doesn't change position)
          */
-        bool updatePosition (Coordinate p) {
-            // unsigned...
-            if (p.x > dimensions.w || p.y > dimensions.h) {
-                // out-of-bounds
-                return false;
-            }
-
-            // valid
-            position = p;
-
-            return true;
-        }
+        bool updatePosition (Coordinate p);
 
 };
 
 class LocalPlayer : public Player {
     protected:
-        LocalPlayer (Coordinate c, bool visible) : Player(c, visible) { }
+        LocalPlayer (GameState &state, Coordinate c, bool visible) : Player(state, c, visible) { }
     
     public:
         virtual bool move (PositionDelta d) {
-            return true;
-
-            //return updatePosition(position + d);
+            return updatePosition(position + d);
         }
 };
 
 class RemotePlayer : public Player {
     protected:
-        RemotePlayer (Coordinate c, bool visible) : Player(c, visible) { }
+        RemotePlayer (GameState &state, Coordinate c, bool visible) : Player(state, c, visible) { }
 
 };
 
@@ -82,6 +74,14 @@
         GameState (void) : map_dimensions(MAP_DIM_W, MAP_DIM_H), local_player(NULL) {
 
         }
+
+        /*
+         * Check if the given coordinate is valid
+         */
+        bool isValidCoordinate (const Coordinate &p) {
+            // unsigned...
+            return !(p.x > map_dimensions.w || p.y > map_dimensions.h);
+        }
         
         /*
          * This will return NULL if we don't have a local player - yet