2 moment.cc -- implement Moment
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
17 Moment::Moment (int m)
19 main_part_ = Rational (m);
20 grace_part_ = Rational ( 0);
23 Moment::Moment (Rational m, Rational g)
29 Moment::Moment (Rational m)
32 grace_part_ = Rational (0);
35 #include "ly-smobs.icc"
36 IMPLEMENT_SIMPLE_SMOBS (Moment);
37 IMPLEMENT_TYPE_P (Moment, "ly:moment?");
40 Moment::mark_smob (SCM)
46 Moment::print_smob (SCM s, SCM port, scm_print_state *)
48 Moment *r = (Moment *) SCM_CELL_WORD_1 (s);
50 scm_puts ("#<Mom ", port);
51 String str = r->to_string ();
52 scm_puts ((char *)str.to_str0 (), port);
59 Moment::as_scheme () const
61 return scm_list_5 (ly_symbol2scm ("ly:make-moment"),
62 scm_from_int (main_part_.num()),
63 scm_from_int (main_part_.den()),
64 scm_from_int (grace_part_.num()),
65 scm_from_int (grace_part_.den()));
70 Moment::equal_p (SCM a, SCM b)
72 Moment *m1 = unsmob_moment (a);
73 Moment *m2 = unsmob_moment (b);
75 return (*m1 == *m2) ? SCM_BOOL_T : SCM_BOOL_F;
79 compare (Moment const &a, Moment const &b)
81 return Moment::compare (a,b);
85 Moment::compare (Moment const &a, Moment const &b)
87 int c = Rational::compare (a.main_part_,b.main_part_);
91 return Rational::compare (a.grace_part_, b.grace_part_);
95 Moment::operator += (Moment const &src)
97 main_part_ += src.main_part_ ;
98 grace_part_ += src.grace_part_;
101 Moment::operator -= (Moment const &src)
103 main_part_ -= src.main_part_ ;
104 grace_part_ -= src.grace_part_;
108 only take the main part of SRC for multiplication.
111 Moment::operator *= (Moment const &src)
113 main_part_ *= src.main_part_ ;
114 grace_part_ *= src.main_part_;
118 only take the main part of SRC for multiplication.
121 Moment::operator /= (Moment const &src)
123 main_part_ /= src.main_part_ ;
124 grace_part_ /= src.main_part_;
130 return main_part_.den ();
136 return main_part_.num ();
140 Moment::to_bool () const
142 return main_part_ || grace_part_;
146 Moment::set_infinite (int k)
148 main_part_.set_infinite (k);
152 Moment::to_string () const
154 String s = main_part_.to_string ();
157 s += "G" + grace_part_.to_string ();
163 Moment::operator - () const
166 m.grace_part_ = - grace_part_;
167 m. main_part_ = - main_part_ ;
172 #ifdef STREAM_SUPPORT
174 operator << (std::ostream &os, Moment const &m)
176 os << m.to_string ();
182 robust_scm2moment (SCM m, Moment d)
184 Moment *p = unsmob_moment (m);
193 moment_less (SCM a, SCM b)
195 return *unsmob_moment (a) < *unsmob_moment (b);