// File: bst.h

#ifndef _BST_H_
#define _BST_H_

#include <iostream>
#include <stdlib.h>

#define DTYPE int

class BSTNode ;

class BST {

// friend class BSTNode ;
friend ostream& operator<< (ostream& os, const BST& T) ;

public:

   BST() ;
   BST(const BST& other) ;
   ~BST() ;

   bool empty() const { return nptr == NULL ; }  // inline

   DTYPE* find(DTYPE x) ;
   void insert(DTYPE x) ;

   bool removeMax(DTYPE &answer) ;
   BSTNode *removeMaxNode() ;   // should be private
   bool remove(DTYPE x, DTYPE &answer) ;

   void inorder() ;
   void inorder2() ;   // with parentheses

   const BST& operator=(const BST& rhs) ;

   void dump() ;

private:
   BSTNode *nptr ;


} ;


ostream& operator<< (ostream& os, const BST& T) ;


class BSTNode {

friend class BST ;

public:
   BSTNode() ;
   BSTNode(DTYPE x) ;

   ~BSTNode() ;

   void dump() ;

private:
   DTYPE data ;
   BST left, right ;
} ;



#endif