// In header: <boost/logic/tribool_io.hpp>
template<typename CharT> 
class indeterminate_name : public facet, private noncopyable {
public:
  // types
  typedef CharT                      char_type;  
  typedef std::basic_string< CharT > string_type;
  // construct/copy/destruct
  indeterminate_name();
  explicit indeterminate_name(const string_type &);
  // public member functions
  string_type name() const;
  // public data members
  static std::locale::id id;  // Uniquily identifies this facet with the locale. 
};