PhysicsManager.hpp

#ifndef PHYSICS_MANAGER_HPP
#define PHYSICS_MANAGER_HPP

#include <Box2D/Box2D.h>
#include <memory>

class PhysicsManager {
 public:
  static PhysicsManager& instance();

  void init();

  void shutdown();

  static std::shared_ptr<b2World> GetWorld();

  static void SetGravity(
                         float x, 
                         float y);

  void Step();

  PhysicsManager(const PhysicsManager&) = delete;

  PhysicsManager& operator=(const PhysicsManager&) = delete;

 private:
  PhysicsManager();

  ~PhysicsManager();

  std::shared_ptr<b2World> world;
};

#endif