#ifndef TLines_SEEN
#define TLines_SEEN
///////    File: TLine_OS.h    ///////
#include        <iostream.h>
#include "SortKey.h"
#include "OrderedSeq.h"

class TextLine_OS : public OrderedSeq 
{  public:
       TextLine_OS(Uint  pos  = 0, Uint size = 1024,
                   Uint ll = 256, String dlm = DELIM);
       String operator[](Uint i);     // overloading []
       void remove(Uint i);           // delete entry i
       Uint length() {   return(len);   }
       void input(istream& in);
       void display(ostream& out = cout);
       ~TextLine_OS();                // destructor
   protected:
       int append(void* line);        // append entry at end
   private:
       void swap(Uint i, Uint j);     // interchange lines
       int cmp(Uint i, Uint j)
       {   return( key.cmp(lines[i], lines[j]));  }
       int cmp(void* k, Uint j)
       {   return( key.cmp(k, lines[j]));  }
       String *lines;
       SortKey key;
       Uint    len;                   // total no. of lines
       Uint    maxlen;                // max no. of lines
       Uint    linelen;               // max line len
       int     read_lines(istream& in);
};
#endif