template<typename BaseClassType, typename ClassType>
BaseClassType *CreateObject()
{
   return new ClassType;
}


template<typename BaseClassType>
class ObjectFactory
{
protected:
   typedef BaseClassType *(*CreateObjectFunc)();

public:
   bool Register(int unique_id, CreateObjectFunc create_object)
   {
      if (m_object_creator.find(unique_id) != m_object_creator.end())
         return false;

      m_object_creator[unique_id] = create_object;

      return true;
   }

   bool Unregister(int unique_id)
   {
      return (m_object_creator.erase(unique_id) == 1);
   }

   BaseClassType *Create(int unique_id)
   {
      std::map<int, CreateObjectFunc>::iterator iter = m_object_creator.find(unique_id);

      if (iter == m_object_creator.end())
         return NULL;

      return ((*iter).second)();
   }

protected:
   std::map<int, CreateObjectFunc> m_object_creator;
};