// In header: <boost/date_time/string_parse_tree.hpp>
template<typename charT> 
struct parse_match_result {
  // types
  typedef std::basic_string< charT > string_type;
  enum PARSE_STATE { PARSE_ERROR = = -1 };
  // construct/copy/destruct
  parse_match_result();
  // public member functions
  string_type remaining() const;
  charT last_char() const;
  bool has_remaining() const;
  // public data members
  string_type cache;
  unsigned short match_depth;
  short current_match;
};