2 rational.hh -- declare rational helpers
4 source file of the Flower Library
6 (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
14 #include "arithmetic-operator.hh"
15 #include "flower-proto.hh"
20 Rational numbers. Included is support for + and - infinity.
27 -2,2 is - and + infinity.
28 -1,1 is negative and positive.
32 unsigned int num_, den_;
34 void copy (Rational const &);
37 void set_infinite (int sign);
38 bool is_infinity () const;
40 int num () const { return sign_ * num_; }
41 int den () const { return den_; }
43 Rational trunc_rat () const;
44 Rational div_rat (Rational) const;
45 Rational mod_rat (Rational) const;
47 // operator bool () const;
49 operator double () const;
50 Rational operator - () const;
58 Rational (Rational const&r) { copy (r);}
59 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;