#include <iostream>
using namespace std;

class BString
{
  friend ostream& operator<< (ostream& os, const BString& b);
  friend istream& operator>> (istream& os, BString& b);

  friend bool operator< (const BString& s1, const BString& s2);
  friend bool operator> (const BString& s1, const BString& s2);
  friend bool operator<= (const BString& s1, const BString& s2);
  friend bool operator>= (const BString& s1, const BString& s2);
  friend bool operator== (const BString& s1, const BString& s2);
  friend bool operator!= (const BString& s1, const BString& s2);

  friend BString operator+(const BString& s1, const BString& s2);

public:
  BString();			// default, set string to empty string
  BString(const char* s);	// create object with the cstring s 
				//   conversion constructor
  ~BString();			// destructor, for dynamic cleanup

  // to manage copies -- deep copy instead of shallow copy
  BString(const BString& bs);			// copy constructor
  BString& operator=(const BString& bs);	// assignment operator
   
  BString& operator+= (const BString& bs);

  int GetSize() const;		// accessor for size attribute

private:
  char* str;		// pointer to dynamic array of char
			//   allocation will always be size+1
  int size;		// size of string

  void Resize(int newsize);		// resize allocation of our string
  void Clone(const BString& bs);	// helper for deep copy
};