Made propulsion optional

Roboid.h

@@ -8,13 +8,13 @@ namespace RoboidControl {
 
 /// @brief A Roboid is used to control autonomous robots
 class Roboid {
- public:
+public:
   /// @brief Default constructor for a Roboid
   Roboid();
   /// @brief Creates a Roboid with Perception and Propulsion abilities
   /// @param perception The Perception implementation to use for this Roboid
   /// @param propulsion The Propulsion implementation to use for this Roboid
-  Roboid(Perception* perception, Propulsion* propulsion);
+  Roboid(Perception *perception, Propulsion *propulsion = nullptr);
 
   /// @brief Update the state of the Roboid
   /// @param currentTimeMs The time in milliseconds when calling this
@@ -22,11 +22,11 @@ class Roboid {
   void Update(float currentTimeMs);
 
   /// @brief The Perception module of this Roboid
-  Perception* perception;
+  Perception *perception;
   /// @brief The Propulsion module of this Roboid
-  Propulsion* propulsion;
+  Propulsion *propulsion;
 };
-}  // namespace RoboidControl
-}  // namespace Passer
+} // namespace RoboidControl
+} // namespace Passer
 
 using namespace Passer::RoboidControl;