removing attack order once the target unit is destroyed

unit.cpp

@@ -248,6 +248,24 @@ namespace battleship{
 		}
 	}
 
+	void Unit::attack(Order order){
+		if(orders[0].targets[0].unit){
+			bool unitFound = false;
+
+			for(Player *pl : Game::getSingleton()->getPlayers()){
+				vector<Unit*> units = pl->getUnits();
+
+				if(find(units.begin(), units.end(), orders[0].targets[0].unit) != units.end()){
+					unitFound = true;
+					break;
+				}
+			}
+
+			if(!unitFound)
+				removeOrder(0);
+		}
+	}
+
     void Unit::setOrder(Order order) {
         while (!orders.empty())
 			removeOrder(0);