Imported Upstream version 2.19.45

[lilypond.git] / flower / include / rational.hh

diff --git a/flower/include/rational.hh b/flower/include/rational.hh
index 30fa2cb6d6e42db46c4a6c89cd3c33264aabfaec..f829e531eccb6ef2d431d9ffe290b0f745c3731d 100644 (file)
--- a/flower/include/rational.hh
+++ b/flower/include/rational.hh
@@ -1 +1,120 @@
-#include <Rational.h>
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
+
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef RATIONAL_HH
+#define RATIONAL_HH
+
+#include "compare.hh"
+#include "flower-proto.hh"
+#include "std-string.hh"
+#include <limits.h>
+
+/**
+   Rational numbers.  Included is support for + and - infinity.
+*/
+class Rational
+{
+  /**
+     Sign of rational.
+     -2, .. 2
+
+     -2,2 is - and + infinity.
+     -1,1 is negative and positive.
+     0 if *this is zero.
+  */
+  int sign_;
+  U64 num_, den_;
+  void normalize ();
+  void copy (Rational const &);
+
+public:
+  void set_infinite (int sign);
+  bool is_infinity () const;
+  void invert ();
+  I64 numerator () const { return sign_ * num_; }
+  I64 denominator () const { return den_; }
+  I64 num () const { return numerator (); }
+  I64 den () const { return denominator (); }
+
+  Rational trunc_rat () const;
+  Rational div_rat (Rational) const;
+  Rational mod_rat (Rational) const;
+  Rational abs () const;
+  void negate ();
+  int to_int () const;
+
+  operator double () const { return to_double (); }
+  double to_double () const;
+
+  Rational operator - () const;
+  /**
+     Initialize to 0.
+  */
+  Rational ();
+  Rational (int);
+  Rational (I64);
+  Rational (U64);
+  explicit Rational (I64, I64);
+  explicit Rational (double);
+  Rational (Rational const &r) { copy (r);}
+  Rational &operator = (Rational const &r)
+  {
+    copy (r);
+    return *this;
+  }
+
+  Rational &operator *= (Rational);
+  Rational &operator /= (Rational);
+  Rational &operator += (Rational);
+  Rational &operator -= (Rational);
+  Rational &operator %= (Rational);
+  static int compare (Rational const &, Rational const &);
+  int sign () const;
+  string to_string () const;
+};
+
+#include "arithmetic-operator.hh"
+
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, / );
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, +);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, *);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, -);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, % );
+
+INSTANTIATE_COMPARE (Rational const &, Rational::compare);
+
+int compare (Rational const &, Rational const &);
+int sign (Rational r);
+
+inline void
+Rational::copy (Rational const &r)
+{
+  sign_ = r.sign_;
+  num_ = r.num_;
+  den_ = r.den_;
+}
+
+#if 0
+ostream &
+operator << (ostream &, Rational);
+#endif
+
+const Rational infinity_rat (U64_MAX);
+
+#endif // RATIONAL_HH