2003 -> 2004

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

diff --git a/flower/include/rational.hh b/flower/include/rational.hh
index 30fa2cb6d6e42db46c4a6c89cd3c33264aabfaec..4c4b0a3891dbfeb74146715c466d94c22161edfd 100644 (file)
--- a/flower/include/rational.hh
+++ b/flower/include/rational.hh
@@ -1 +1,99 @@
-#include <Rational.h>
+/*
+  rational.hh -- declare rational helpers
+
+  source file of the Flower Library
+
+  (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
+
+
+#ifndef RATIONAL_HH
+#define RATIONAL_HH
+
+#include "compare.hh"
+#include "arithmetic-operator.hh"
+#include "flower-proto.hh"
+#include "string.hh"
+
+
+/**
+   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_;
+  unsigned int num_, den_;
+  void normalise ();
+  void copy (Rational const &);
+
+public:
+  void set_infinite (int sign);
+  bool is_infinity () const;
+  void invert ();
+  int num () const { return sign_ * num_; }
+  int den () const { return den_; }
+
+  Rational trunc_rat () const;
+  Rational div_rat (Rational) const;
+  Rational mod_rat (Rational) const;
+  void negate ();
+  //   operator bool () const;
+  int to_int () const;
+  operator double () const;
+  Rational operator - () const;
+  /**
+     Initialize to 0. 
+   */
+  Rational ();
+  Rational (int);
+  Rational (int, int);
+  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;
+};
+
+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 = INT_MAX;
+
+#endif // RATIONAL_HH