// In header: <boost/text/collate.hpp>


struct text_sort_key {
  // types
  typedef std::vector< uint32_t >::const_iterator const_iterator;
  typedef const_iterator                          iterator;      
  typedef uint32_t                                value_type;    

  // construct/copy/destruct
  text_sort_key();
  explicit text_sort_key(std::vector< uint32_t >);

  // public member functions
  std::size_t size() const;
  const_iterator begin() const;
  const_iterator end() const;
};