+/****************************************************************/
+
+int
+compare (Moment const &a, Moment const &b)
+{
+ return Moment::compare (a,b);
+}
+
+int
+Moment::compare (Moment const &a, Moment const &b)
+{
+ int c = Rational::compare (a.main_part_,b.main_part_);
+ if (c)
+ return c;
+
+ return Rational::compare (a.grace_part_, b.grace_part_);
+}
+
+Moment::Moment ()
+{
+
+}
+
+Moment::Moment (int m)
+{
+ main_part_ = Rational(m);
+ grace_part_ = Rational( 0);
+}
+
+Moment::Moment (Rational m, Rational g)
+{
+ main_part_ = m;
+ grace_part_ = g;
+}
+
+Moment::Moment (Rational m)
+{
+ main_part_ = m;
+ grace_part_ = Rational (0);
+}
+
+void
+Moment::operator += (Moment const &src)
+{
+ main_part_ +=src.main_part_ ;
+ grace_part_ += src.grace_part_;
+}
+void
+Moment::operator -= (Moment const &src)
+{
+ main_part_ -= src.main_part_ ;
+ grace_part_ -= src.grace_part_;
+}
+
+/*
+ only take the main part of SRC for multiplication.
+*/
+void
+Moment::operator *= (Moment const &src)
+{
+ main_part_ *= src.main_part_ ;
+ grace_part_ *= src.main_part_;
+}
+
+/*
+ only take the main part of SRC for multiplication.
+*/
+void
+Moment::operator /= (Moment const &src)
+{
+ main_part_ /= src.main_part_ ;
+ grace_part_ /= src.main_part_;
+}
+
+
+
+int
+Moment::den () const { return main_part_.den (); }
+
+int
+Moment::num () const { return main_part_.num (); }
+
+bool
+Moment::to_bool () const
+{
+ return main_part_ || grace_part_;
+}
+
+void
+Moment::set_infinite (int k)
+{
+ main_part_.set_infinite (k);
+}
+
+
+String
+Moment::to_string () const
+{
+ String s = main_part_.to_string ();
+ if (grace_part_)
+ {
+ s += "G" + grace_part_.to_string ();
+ }
+ return s;
+}
+
+Moment
+Moment::operator - () const
+{
+ Moment m;
+ m.grace_part_ = - grace_part_;
+ m. main_part_ = - main_part_ ;
+ return m;
+}
+
+
+#ifdef STREAM_SUPPORT
+std::ostream &
+operator << (std::ostream &os, Moment const &m)
+{
+ os << m.to_string ();
+ return os;
+}
+#endif