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support-values.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Copyright:
7 * Christian Schulte, 2008
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
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33
34namespace Gecode { namespace Int {
35
36 template<class View, class A>
37 forceinline void
39 rp = rp_fst; v = rp->min;
40 max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
41 }
42
43 template<class View, class A>
44 inline
46 : a(a0), x(x0), bs(a,x.size(),true) {
47 unsigned int n = 0;
48 for (ViewRanges<View> r(x); r(); ++r)
49 n++;
50 rp_fst = a.template alloc<RangePos>(n+1);
51 rp_lst = rp_fst + n;
52 unsigned int p = 0;
53 int i = 0;
54 for (ViewRanges<View> r(x); r(); ++r) {
55 rp_fst[i].min = r.min();
56 rp_fst[i].pos = p;
57 p += r.width(); i++;
58 }
59 rp_fst[i].pos=p;
60 reset();
61 }
62
63 template<class View, class A>
66 bs.dispose(a);
67 a.free(rp_fst,static_cast<unsigned long int>(rp_lst-rp_fst+1));
68 }
69
70 template<class View, class A>
71 forceinline void
73 if (++v > max)
74 if (++rp < rp_lst) {
75 v = rp->min;
76 max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
77 }
78 }
79
80 template<class View, class A>
81 forceinline bool
83 return rp < rp_lst;
84 }
85
86 template<class View, class A>
87 forceinline int
89 return v;
90 }
91
92 template<class View, class A>
93 forceinline void
95 bs.clear(rp->pos + static_cast<unsigned int>(v-rp->min));
96 }
97
98 template<class View, class A>
99 forceinline bool
101 RangePos* l = rp_fst;
102 RangePos* r = rp_lst-1;
103 while (true) {
104 if (l > r) return false;
105 RangePos* m = l + (r-l)/2;
106 int max = m->min + static_cast<int>((m+1)->pos - m->pos) - 1;
107 if ((n >= m->min) && (n <= max)) {
108 bs.clear(m->pos + static_cast<unsigned int>(n-m->min));
109 return true;
110 }
111 if (l == r) return false;
112 if (n < m->min)
113 r=m-1;
114 else
115 l=m+1;
116 }
118 return false;
119 }
120
121 template<class View, class A>
122 forceinline bool
124 if ((n < x.min()) || (n > x.max()))
125 return false;
126 return _support(n);
127 }
128
129 template<class View, class A>
130 forceinline bool
132 if ((n < x.min()) || (n > x.max()))
133 return false;
134 return _support(static_cast<int>(n));
135 }
136
137 template<class View, class A>
138 forceinline void
140 // Skip all supported positions
141 while ((p < sv.x.size()) && !sv.bs.get(p))
142 p = sv.bs.next(p);
143 // Move to matching range
144 while ((rp < sv.rp_lst) && (p >= (rp+1)->pos))
145 rp++;
146 }
147
148 template<class View, class A>
151 : rp(sv0.rp_fst), p(0), sv(sv0) {
152 find();
153 }
154
155 template<class View, class A>
156 forceinline void
157 SupportValues<View,A>::Unsupported::operator ++(void) {
158 p++; find();
159 }
160
161 template<class View, class A>
162 forceinline bool
163 SupportValues<View,A>::Unsupported::operator ()(void) const {
164 return rp < sv.rp_lst;
165 }
166
167 template<class View, class A>
168 forceinline int
169 SupportValues<View,A>::Unsupported::val(void) const {
170 return static_cast<int>(rp->min+(p-rp->pos));
171 }
172
173 template<class View, class A>
174 inline ModEvent
176 Unsupported u(*this);
177 return x.minus_v(home,u,false);
178 }
179
180}}
181
182// STATISTICS: int-prop
183
NNF * l
Left subtree.
union Gecode::@603::NNF::@65 u
Union depending on nodetype t.
int p
Number of positive literals for node type.
int n
Number of negative literals for node type.
struct Gecode::@603::NNF::@65::@67 a
For atomic nodes.
Support value iterator and recorder
int val(void) const
Return current value.
void support(void)
Mark current (iterator) value as supported.
~SupportValues(void)
Destructor.
SupportValues(A &a, View x)
Initialize for view x.
ModEvent tell(Space &home)
Remove all unsupported values.
void operator++(void)
Move iterator to next value (if possible)
void reset(void)
Reset iterator.
bool operator()(void) const
Test whether iterator is still at a value or done.
Range iterator for integer views.
Definition view.hpp:54
Computation spaces.
Definition core.hpp:1742
bool get(unsigned int i) const
Access value at bit i.
unsigned int next(unsigned int i) const
Return position greater or equal i of next set bit (i is allowed to be equal to size)
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:767
void min(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Post propagator for SetVar x
Definition set.hh:767
int ModEvent
Type for modification events.
Definition core.hpp:62
#define forceinline
Definition config.hpp:187
#define GECODE_NEVER
Assert that this command is never executed.
Definition macros.hpp:56