release: 1.5.0

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

diff --git a/flower/include/rational.hh b/flower/include/rational.hh
index d3b68f726fba9d0c5c584721a55313c19a015b20..270ee5634157ce8998a9089261f1d4d864c30aff 100644 (file)
--- a/flower/include/rational.hh
+++ b/flower/include/rational.hh
@@ -1,17 +1,94 @@
 /*
-  rational.hh -- declare 
+  rational.hh -- declare rational helpers
 
   source file of the Flower Library
 
-  (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
 
 #ifndef RATIONAL_HH
 #define RATIONAL_HH
-#include <Rational.h>
 
-/// print a Rational. To be called from the  debugger
-void print_rat(Rational const&);
+#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 infty_b () 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;
+  operator int () const;
+  operator double () const;
+  Rational operator - () const;
+  /**
+     Initialize to 0. 
+   */
+  Rational ();
+  Rational (int, int =1);
+  Rational (double);
+  Rational (Rational const&r) {   copy (r);}
+
+  Rational &operator = (Rational const &);
+  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 str () 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_;
+}
+
+ostream &
+operator << (ostream &,  Rational);
+
+const Rational infinity_rat = INT_MAX;
 
 #endif // RATIONAL_HH