2 rational.hh -- declare rational helpers
4 source file of the Flower Library
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
15 Rational numbers. Included is support for + and - infinity.
23 -2,2 is - and + infinity.
24 -1,1 is negative and positive.
28 unsigned int num_, den_;
30 void copy (Rational const &);
33 void set_infinite (int sign);
34 bool is_infinity () const;
36 int numerator () const { return sign_ * num_; }
37 int denominator () const { return den_; }
38 int num () const { return numerator (); }
39 int den () const { return denominator (); }
41 Rational trunc_rat () const;
42 Rational div_rat (Rational) const;
43 Rational mod_rat (Rational) const;
45 // operator bool () const;
47 operator double () const;
48 Rational operator- () const;
56 Rational (Rational const &r) { copy (r);}
57 Rational &operator= (Rational const &r)
59 copy (r); return *this;
62 Rational &operator*= (Rational);
63 Rational &operator/= (Rational);
64 Rational &operator+= (Rational);
65 Rational &operator-= (Rational);
66 Rational &operator%= (Rational);
67 static int compare (Rational const &, Rational const &);
69 String to_string () const;
72 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, /);
73 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, +);
74 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, *);
75 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, -);
76 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, %);
78 INSTANTIATE_COMPARE (Rational const &, Rational::compare);
80 int compare (Rational const &, Rational const &);
81 int sign (Rational r);
84 Rational::copy (Rational const &r)
93 operator<< (ostream &, Rational);
96 const Rational infinity_rat = INT_MAX;