template<typename CharT, typename Traits = std::char_traits<CharT>, 
         typename Allocator = std::allocator<CharT> > 
class istream_line_iterator {
public:
  // types
  typedef CharT                                            char_type;        
  typedef Traits                                           traits_type;      
  typedef Allocator                                        allocator_type;   
  typedef std::basic_istream<CharT,Traits>                 istream_type;     
  typedef std::basic_string<CharT,Traits,Allocator>        string_type;      
  typedef std::basic_string<CharT,Traits,Allocator>        value_type;       
  typedef std::basic_string<CharT,Traits,Allocator>        reference;        
  typedef const std::basic_string<CharT,Traits,Allocator>* pointer;          
  typedef implementation defined                           difference_type;  
  typedef std::input_iterator_tag                          iterator_category;

  // construct/copy/destruct
  istream_line_iterator();
  explicit istream_line_iterator(istream_type&);
  istream_line_iterator(istream_type&, CharT);

  // operators
  implementation defined operator*() const;
  istream_line_iterator<CharT,Traits,Allocator>& operator++();

  private: istream_type* in_stream;
  private: CharT delim;
  private: value_type value;
};