2 interval.hh -- part of flowerlib
4 (c) 1996--2004 Han-Wen Nienhuys
11 #include "flower-proto.hh"
13 #include "drul-array.hh"
15 /* A T interval. This represents the closed interval [left,right].
16 No invariants. T must be a totally ordered ring (with division, anyway ..)
17 At instantiation, the function infinity () has to be defined explicitely. */
19 struct Interval_t : public Drul_array<T>
24 static String T_to_string (T arg);
27 assert (!is_empty ());
28 return (elem (LEFT) + elem (RIGHT)) / T (2);
43 *this and h are comparable
45 void unite (Interval_t<T> h);
46 void intersect (Interval_t<T> h);
49 elem(LEFT) = elem (LEFT) <? p;
50 elem(RIGHT) = elem (RIGHT) >? p;
58 TODO: strip hungarian suffix.
60 bool is_empty () const
62 return elem (LEFT) > elem (RIGHT);
64 bool superset (Interval_t<T> const&) const;
69 Interval_t (T m, T M) : Drul_array<T> (m,M)
72 Interval_t<T> &operator -= (T r) {
77 Interval_t<T> &operator += (T r) {
82 Interval_t<T> &operator *= (T r) {
94 Real linear_combination (Real x) const
96 Drul_array<Real> da (elem (LEFT), elem (RIGHT));
97 return ::linear_combination (da, x);
99 String to_string () const;
113 elem (LEFT) = elem (RIGHT);
120 inclusion ordering. Crash if not comparable.
123 int Interval__compare (const Interval_t<T>&,Interval_t<T> const&);
126 Inclusion ordering. return -2 if not comparable
130 _Interval__compare (const Interval_t<T>&a,Interval_t<T> const&b);
137 #include "compare.hh"
139 TEMPLATE_INSTANTIATE_COMPARE (Interval_t<T>&, Interval__compare, template<class T>);
144 intersection (Interval_t<T> a, Interval_t<T> const&b)
153 Interval_t<T> operator + (T a,Interval_t<T> i)
161 Interval_t<T> operator - (Interval_t<T> i, T a)
169 Interval_t<T> operator - (T a,Interval_t<T> i)
178 Interval_t<T> operator + (Interval_t<T> i,T a){
184 Interval_t<T> operator * (T a,Interval_t<T> i)
192 Interval_t<T> operator * (Interval_t<T> i,T a){
196 // again? see flower-proto.hh
197 typedef Interval_t<Real> Interval;
198 typedef Interval_t<int> Slice; // weird name
201 #endif // INTERVAL_HH