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;
46 operator bool () const;
47 operator double () const;
49 Rational operator - () const;
57 Rational (Rational const &r) { copy (r);}
58 Rational &operator = (Rational const &r)
60 copy (r); return *this;
63 Rational &operator *= (Rational);
64 Rational &operator /= (Rational);
65 Rational &operator += (Rational);
66 Rational &operator -= (Rational);
67 Rational &operator %= (Rational);
68 static int compare (Rational const &, Rational const &);
70 String to_string () const;
73 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, /);
74 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, +);
75 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, *);
76 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, -);
77 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, %);
79 INSTANTIATE_COMPARE (Rational const &, Rational::compare);
81 int compare (Rational const &, Rational const &);
82 int sign (Rational r);
85 Rational::copy (Rational const &r)
94 operator << (ostream &, Rational);
97 const Rational infinity_rat = INT_MAX;