745: Mainline

Finally, to reset the current_link_pointer so that it points to the first link, you define reset:

class header { 
  public: 
    link *first_link_pointer; 
    link *current_link_pointer; 
    header ( ) { 
      first_link_pointer = NULL; 
      current_link_pointer = first_link_pointer; 
    } 
    void add (railroad_car *new_element) { 
      first_link_pointer = new link (new_element, first_link_pointer); 
      current_link_pointer = first_link_pointer; 
    } 
    void advance ( ) { 
      current_link_pointer = current_link_pointer -> next_link_pointer; 
    } 
    railroad_car* access ( ) { 
      return current_link_pointer -> element_pointer; 
    } 
    int endp ( ) { 
      return ! current_link_pointer; 
    } 
    void reset ( ) {                               
      current_link_pointer = first_link_pointer;   
    }                                              
};