/*
  moment.hh -- declare Moment

  source file of the GNU LilyPond music typesetter

  (c) 1999--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/

#ifndef MOMENT_HH
#define MOMENT_HH

#include "smobs.hh"
#include "rational.hh"

/**
   Musical timing (Main-timing, grace-timing) with glue for
   Guilification;
*/
class Moment
{
  DECLARE_SIMPLE_SMOBS (Moment,);
public:
  Moment ();
  Moment (int m);

  Moment (Rational, Rational);
  Moment (Rational m);

  Moment operator - () const;

  void operator += (Moment const &m);
  void operator -= (Moment const &m);

  void operator *= (Moment const &m);
  void operator /= (Moment const &m);
  void operator %= (Moment const &m);

  Rational main_part_;
  Rational grace_part_;

  void set_infinite (int k);

  bool to_bool () const;
  int den () const;
  int num () const;
  /*
    Deliver a copy of THIS as a smobified SCM
  */
  string to_string () const;
  static int compare (Moment const &, Moment const &);
  SCM as_scheme () const;
};

IMPLEMENT_ARITHMETIC_OPERATOR (Moment, +);
IMPLEMENT_ARITHMETIC_OPERATOR (Moment, -);
IMPLEMENT_ARITHMETIC_OPERATOR (Moment, /);
IMPLEMENT_ARITHMETIC_OPERATOR (Moment, *);
IMPLEMENT_ARITHMETIC_OPERATOR (Moment, %);

DECLARE_UNSMOB (Moment, moment);
int compare (Moment const &, Moment const &);
INSTANTIATE_COMPARE (Moment const &, Moment::compare);

Moment robust_scm2moment (SCM, Moment);

#ifdef STREAM_SUPPORT
ostream &operator << (ostream &, Moment const &);
#endif

bool moment_less (SCM a, SCM b);

#endif /* MOMENT_HH */

