// File: Thing.h
//
// One file that contains the class definitions of
// Thing, Wall and Goal.
// 
// You must not alter this file.
//

#ifndef THING_H
#define THING_H

class Car ;
class RaceCourse ;

//-------------------------------------------------------------------
class Thing {

public :

   // Default constructor
   Thing() ;

   // Alternate constructor
   // Assigns the row and position of the Thing
   //
   Thing(unsigned int row, unsigned int col) ;

   // Destructor
   // Thing has no dynamically allocated data, but derived class might.
   //
   virtual ~Thing() ;

   // What happens when a Car bounces off current Thing.
   // Mostly interesting in the derived classes.
   //
   virtual void encounter (Car *ptr) ;

   // Report row and column of this Thing's position
   //
   unsigned int GetRow() const ; 
   unsigned int GetCol() const ;


   // DrawMe() returns a character that can be used by
   // PrettyPrintCourse and others to print this Thing.
   // For example, a Wall object returns '#'.
   //
   virtual char DrawMe() const =0 ;


   // Stores a RaceCourse pointer in Rptr.
   // When a Thing is added to a RaceCourse, the RaceCourse
   // should use SetRaceCoursePtr() to store a pointer
   // to the RaceCourse in the Thing.
   //
   void SetRaceCoursePtr(RaceCourse *ptr) ;

protected :
   unsigned int m_row ;
   unsigned int m_col ;
   RaceCourse *Rptr ;
} ;


//-------------------------------------------------------------------

// A Wall object represents an obstacle in the race course.
// Cars are not penalized for bumping into a Wall.

class Wall : public Thing {
public:
   Wall() ;
   Wall(unsigned int row, unsigned int col) ;

   char DrawMe() const ;
} ;


//-------------------------------------------------------------------

// A Car that bumps into a Goal wins the race.

class Goal : public Thing {
public:
   Goal() ;
   Goal(unsigned int row, unsigned int col) ;

   char DrawMe() const ;
   void encounter (Car *ptr) ;

   Car *GetWinner() const ;

protected:
   Car *winner ;
} ;



#endif