#include <iostream>
using namespace std;

class BString
{
  friend ostream& operator<<(ostream& os, const BString& s);
  friend istream& operator>>(istream& is, BString& s);	// this reads to white space
  friend istream& getline(istream& is, BString& s);	// this reads up to newline
  friend istream& getline(istream& is, BString& s, char delim);	// this reads up to delim

  friend BString operator+ (const BString& x, const BString& y);

  friend bool operator< (const BString& x, const BString& y);
  friend bool operator> (const BString& x, const BString& y);
  friend bool operator<=(const BString& x, const BString& y);
  friend bool operator>=(const BString& x, const BString& y);
  friend bool operator==(const BString& x, const BString& y);
  friend bool operator!=(const BString& x, const BString& y);

public:
  BString();			// default constructor -- init to empty string
  BString(const char* s);	// conversion from c-string
  ~BString();			// destructor for cleanup
  
  // copy constructor and assignment operator for deep copy
  BString(const BString& s);	
  BString& operator=(const BString& s);

  BString& operator+=(const BString& s);  // concatenate s onto calling obj

  int GetSize() const;		// retrieve the size of the string
  BString substring(int pos, int len);


private:
  char * str;		// the pointer to my dynamic string
  int size;		// size of string -- allocation will be
			//  size+1, so that we can store AS a c-string

  void Resize(int newsize);     // resize the string to newsize
};