template<typename ymd_type, typename facet_type, typename charT = char> 
class ostream_ymd_formatter {
public:
  // types
  typedef ymd_type::month_type                         month_type;          
  typedef ostream_month_formatter< facet_type, charT > month_formatter_type;
  typedef std::basic_ostream< charT >                  ostream_type;        
  typedef std::basic_string< charT >                   foo_type;            

  // public static functions
  void ymd_put(ymd_type, ostream_type &, const facet_type &) ;
};