// In header: <boost/compute/iterator/constant_buffer_iterator.hpp>
template<typename T> 
class constant_buffer_iterator {
public:
  // types
  typedef unspecified                 super_type;     
  typedef super_type::reference       reference;      
  typedef super_type::difference_type difference_type;
  // construct/copy/destruct
  constant_buffer_iterator();
  constant_buffer_iterator(const buffer &, size_t);
  constant_buffer_iterator(const constant_buffer_iterator< T > &);
  constant_buffer_iterator< T > & 
  operator=(const constant_buffer_iterator< T > &);
  ~constant_buffer_iterator();
  // public member functions
  const buffer & get_buffer() const;
  size_t get_index() const;
  T read(command_queue &) const;
  void write(const T &, command_queue &);
  template<typename Expr> unspecified operator[](const Expr &) const;
  // private member functions
  reference dereference() const;
  bool equal(const constant_buffer_iterator< T > &) const;
  void increment();
  void decrement();
  void advance(difference_type);
  difference_type distance_to(const constant_buffer_iterator< T > &) const;
};