#ifndef XY_STRING_H
#define XY_STRING_H

//
//  ============================================================
//
//                  STring
//
//  ============================================================
//
//
//      Copyright (C) 1998
//
//
//                      Professor Kenneth I. Joy
//                      Computer Science Department
//                      University of California
//                      Davis, CA  95616
//
//      Permission is granted to use at your own risk and
//      distribute this software in source and binary forms
//      provided the above copyright notice and this paragraph
//      are preserved on all copies.  This software is provided
//      "as is" with no express or implied warranty.
//
//
//  ============================================================
//


class STring {

   protected :

      char		*_string ;

      unsigned int	_length ;

   public :

      STring () ;

      STring ( const int ) ;
      STring ( const double ) ;
      STring ( const char ) ;
      STring ( const char * ) ;

      STring ( const STring& ) ;

      virtual ~STring () ;

      STring& operator= ( const char * ) ;
      STring& operator= ( const STring& ) ;

      char& operator[] ( int ) ;

      STring operator() ( const int, const int ) const ;

      friend ostream& operator<< ( ostream&, const STring& ) ;
      friend istream& operator>> ( istream&, STring& ) ;

      ostream& output ( ostream&, const int = 0 ) const ;

      friend int operator == ( const STring&, const STring& ) ;
      friend int operator != ( const STring&, const STring& ) ;
      friend int operator <= ( const STring&, const STring& ) ;
      friend int operator >= ( const STring&, const STring& ) ;
      friend int operator < ( const STring&, const STring& ) ;
      friend int operator > ( const STring&, const STring& ) ;

      friend STring operator+ ( const STring&, const STring& ) ;
      friend STring operator+ ( const char *, const STring& ) ;
      friend STring operator+ ( const STring&, const char * ) ;
      friend STring operator+ ( const char, const STring& ) ;
      friend STring operator+ ( const STring&, const char ) ;

      STring& operator+= ( const STring & ) ;
      STring& operator+= ( const char * ) ;
      STring& operator+= ( const char ) ;

      int has_substring ( const STring& ) const ;

      int is_integer () const ;
      int is_numeric () const ;

      int Length() const ;

      STring token () ;

      friend STring repeat ( const STring&, const int ) ;

      char * string () const ;

      void lowercase() ;

      int int_value () const ;

      double double_value () const ;

   } ;

STring Blanks ( const int ) ;

const STring NullString ;

#endif