// In header: <boost/interprocess/indexes/null_index.hpp>

template<typename MapConfig> 
class null_index {
public:
  // types
  typedef void *       iterator;      
  typedef const void * const_iterator;

  // construct/copy/destruct
  null_index(segment_manager_base *);

  // public member functions
  const_iterator begin() const;
  iterator begin();
  const_iterator end() const;
  iterator end();
};