#ifndef TextLines_SEEN__
#define TextLines_SEEN__
///////    File: TextLines.h    ///////
#include        <iostream.h>

typedef char * String;
typedef unsigned int Uint;

class TextLines
{  public:
       TextLines(Uint size = 1024, Uint ll = 256);
       String operator[](Uint i)      // overloading []
       {  return( i < len ? lines[i] : NULL ); }
       Uint length() {   return(len);   }
       void swap(Uint i, Uint j)      // interchange lines
       {  String tmp = lines[i];
          lines[i] = lines[j];
          lines[j] = tmp;
       }
       void input(istream& in);
       void display();
       ~TextLines();          // destructor
   private:
       String *lines;
       Uint    len;                   // total no. of lines
       Uint    maxlines;              // max no. of lines
       Uint    linelen;               // max line len
       int     read_lines(istream& in);
};
#endif