2 rational.hh -- declare rational helpers
4 source file of the Flower Library
6 (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
12 #include "std-string.hh"
16 Rational numbers. Included is support for + and - infinity.
24 -2,2 is - and + infinity.
25 -1,1 is negative and positive.
29 unsigned int num_, den_;
31 void copy (Rational const &);
34 void set_infinite (int sign);
35 bool is_infinity () const;
37 int numerator () const { return sign_ * num_; }
38 int denominator () const { return den_; }
39 int num () const { return numerator (); }
40 int den () const { return denominator (); }
42 Rational trunc_rat () const;
43 Rational div_rat (Rational) const;
44 Rational mod_rat (Rational) const;
45 Rational abs () const;
49 operator double () const { return to_double (); }
50 double to_double () const;
52 Rational operator - () const;
58 explicit Rational (int, int);
59 explicit Rational (double);
60 Rational (Rational const &r) { copy (r);}
61 Rational &operator = (Rational const &r)
63 copy (r); return *this;
66 Rational &operator *= (Rational);
67 Rational &operator /= (Rational);
68 Rational &operator += (Rational);
69 Rational &operator -= (Rational);
70 Rational &operator %= (Rational);
71 static int compare (Rational const &, Rational const &);
73 string to_string () const;
76 #include "arithmetic-operator.hh"
78 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, /);
79 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, +);
80 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, *);
81 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, -);
82 IMPLEMENT_ARITHMETIC_OPERATOR (Rational, %);
84 INSTANTIATE_COMPARE (Rational const &, Rational::compare);
86 int compare (Rational const &, Rational const &);
87 int sign (Rational r);
90 Rational::copy (Rational const &r)
99 operator << (ostream &, Rational);
102 const Rational infinity_rat (INT_MAX);
104 #endif // RATIONAL_HH