771: Mainline

Similarly, whenever a reference to the link class appears inside the definition of the header class, you must provide an argument inside brackets. Again, in the railroad-car–list example, header_parameter is destined to be replaced by railroad_car:

template  
class header { 
  public: 
    header ( ) { 
      first_link_pointer = NULL; 
      current_link_pointer = first_link_pointer; 
    } 
    void add (header_parameter *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; 
    } 
    header_parameter* access ( ) { 
      return current_link_pointer -> element_pointer; 
    } 
    int endp ( ) { 
      return ! current_link_pointer; 
    } 
    void reset ( ) { 
      current_link_pointer = first_link_pointer; 
    } 
  private: 
    link *first_link_pointer; 
    link *current_link_pointer; 
};