source file of the Flower Library
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-
#ifndef RATIONAL_HH
#define RATIONAL_HH
-#if PARANOIA
-#ifndef Rational
-#define Rational MyRational
-#endif
-#endif
+#include "flower-proto.hh"
+#include "std-string.hh"
+#include <limits.h>
-#include "compare.hh"
-#include "arithmetic-operator.hh"
-#include "fproto.hh"
+/**
+ Rational numbers. Included is support for + and - infinity.
+*/
+class Rational
+{
+ /**
+ Sign of rational.
+ -2, .. 2
-class Rational {
+ -2,2 is - and + infinity.
+ -1,1 is negative and positive.
+ 0 if *this is zero.
+ */
int sign_;
- unsigned int num_, den_;
- void normalise ();
+ U64 num_, den_;
+ void normalize ();
void copy (Rational const &);
+
public:
void set_infinite (int sign);
- bool infty_b () const;
+ bool is_infinity () const;
void invert ();
- int num () const { return sign_ * num_; }
- int den () const { return den_; }
- Rational truncated () const;
+ 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 ();
- operator bool () const;
- operator int () const;
- operator double () const;
- operator String () const;
+ int to_int () const;
+
+ operator double () const { return to_double (); }
+ double to_double () const;
+
Rational operator - () const;
+ /**
+ Initialize to 0.
+ */
Rational ();
- Rational (int, int =1);
- Rational (double);
- Rational (Rational const&);
+ 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 const &);
Rational &operator *= (Rational);
- Rational &operator /= (Rational);
- Rational &operator += (Rational);
- Rational &operator -= (Rational);
- static int compare (Rational const&, Rational const&);
+ 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;
+ string to_string () const;
};
-IMPLEMENT_ARITHMETIC_OPERATOR (Rational, / );
-IMPLEMENT_ARITHMETIC_OPERATOR (Rational, + );
-IMPLEMENT_ARITHMETIC_OPERATOR (Rational, * );
-IMPLEMENT_ARITHMETIC_OPERATOR (Rational, - );
+#include "arithmetic-operator.hh"
-INSTANTIATE_COMPARE (Rational const&, Rational::compare);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, /);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, +);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, *);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, -);
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, %);
-int compare (Rational const&,Rational const&);
+INSTANTIATE_COMPARE (Rational const &, Rational::compare);
+
+int compare (Rational const &, Rational const &);
int sign (Rational r);
inline void
-Rational::copy (Rational const&r)
+Rational::copy (Rational const &r)
{
sign_ = r.sign_;
num_ = r.num_;
den_ = r.den_;
}
-class ostream;
+#if 0
ostream &
-operator << (ostream &, Rational);
+operator << (ostream &, Rational);
+#endif
+
+const Rational infinity_rat (U64_MAX);
#endif // RATIONAL_HH