+ Duration compressed (Rational) const;
+ Rational get_length () const;
+ Rational factor () const { return factor_; }
+ int duration_log () const;
+ int dot_count () const;
+
+ static int compare (Duration const &, Duration const &);
+
+ DECLARE_SCHEME_CALLBACK (less_p, (SCM a, SCM b));
+ DECLARE_SIMPLE_SMOBS (Duration);
+
+private: