Listing 6 Class definition for lns using a pair of pointers

//
// lns1b.h - line number sequence interface
//

#ifndef LNS_H_INCLUDED
#define LNS_H_INCLUDED

class lns
   {
public:
   lns(unsigned n);
   ~lns();
   void add(unsigned n);
   void print();
private:
   class node;
   node *first, *last;
   };
   
class lns::node
   {
public:
   node(unsigned n);
   unsigned number;
   node *next;
   };

inline lns::node::node(unsigned n)
   : number(n), next(0)
   {
   }
   
#endif

// End of File