source file of the Flower Library
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#ifndef RATIONAL_HH
#define RATIONAL_HH
-#if PARANOIA
-#ifndef Rational
-#define Rational MyRational
-#endif
-#endif
-
#include "compare.hh"
#include "arithmetic-operator.hh"
-#include "fproto.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;
+ bool is_infinity () const;
void invert ();
- int num () const { return sign_ * num_; }
- int den () const { return den_; }
- Rational truncated () const;
+ 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 String () const;
+ // operator bool () const;
+ int to_int () const;
+ operator double () const;
Rational operator - () const;
+ /**
+ Initialize to 0.
+ */
Rational ();
- Rational (int, int =1);
+ Rational (int);
+ Rational (int, int);
Rational (double);
- Rational (Rational const&);
+ 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);
+ 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, - );
+IMPLEMENT_ARITHMETIC_OPERATOR (Rational, % );
INSTANTIATE_COMPARE (Rational const&, Rational::compare);
den_ = r.den_;
}
-class ostream;
+#if 0
ostream &
operator << (ostream &, Rational);
+#endif
+
+const Rational infinity_rat = INT_MAX;
#endif // RATIONAL_HH