// File: twodim5.h
//
// A two-dimensional array of int ADT.
// This version is NOT templated, but has a nested SmartIntPtr class.
// In version 5, we use a class declaration of SmartIntPtr in 
// TwoDimArray, but defining it separately, outside.
//
// This time A[][] checks for out of bounds


// The SmartIntPtr class is only used by TwoDim Array.
// It does not allocate memory at all. 
// This class does not need a copy constructor or
// overloaded assignment operator.

#ifndef TWODIM_H
#define TWODIM_H


class TwoDimArray {

public:

   // Constructors
   TwoDimArray() ;
   TwoDimArray(unsigned int r, unsigned int c) ;

   // Copy Constructor
   TwoDimArray(const TwoDimArray& A) ;
   
   // Destructor
   ~TwoDimArray() ;

   TwoDimArray& operator=(const TwoDimArray& rhs) ;

   void Print() ;

   int& at(unsigned int r, unsigned int c) ;

private:
   class SmartIntPtr ;  // to be defined later

public:
   SmartIntPtr operator[] (unsigned int r) ; 
   
private:
   unsigned int rows, cols ;
   int *M ;

} ;


class TwoDimArray::SmartIntPtr {   
public:
   // Constructors
   SmartIntPtr() ;
   SmartIntPtr(int *ptr, unsigned int size) ;

   // Overload []
   int& operator[] (unsigned int c) ;

private:
   int *p ;
   int n ;

} ;

#endif