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int-lq.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 *
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7 * Christian Schulte, 2011
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33
34#include <gecode/int/rel.hh>
36
37namespace Gecode { namespace Int { namespace NValues {
38
39 template<class VY>
42 : IntBase<VY>(home,vs,x,y) {
43 home.notice(*this, AP_WEAKLY);
44 }
45
46 template<class VY>
47 inline ExecStatus
49 if (x.size() == 0) {
50 GECODE_ME_CHECK(y.eq(home,0));
51 return ES_OK;
52 }
53
54 x.unique();
55
56 GECODE_ME_CHECK(y.gq(home,1));
57
58 if (x.size() == 1)
59 return ES_OK;
60
61 if (y.max() == 1) {
62 assert(y.assigned());
64 }
65
66 if (y.min() >= x.size())
67 return ES_OK;
68
69 // Eliminate assigned views and store them into the value set
70 ValSet vs;
71 int n = x.size();
72 for (int i=n; i--; )
73 if (x[i].assigned()) {
74 vs.add(home, x[i].val());
75 x[i] = x[--n];
76 }
77
78 GECODE_ME_CHECK(y.gq(home,vs.size()));
79
80 if (n == 0) {
81 assert(y.min() >= vs.size());
82 return ES_OK;
83 }
84
85 x.size(n);
86
87 (void) new (home) LqInt<VY>(home, vs, x, y);
88 return ES_OK;
89 }
90
91 template<class VY>
94 : IntBase<VY>(home, p) {}
95
96 template<class VY>
99 return new (home) LqInt<VY>(home, *this);
100 }
101
102 template<class VY>
103 forceinline size_t
105 home.ignore(*this, AP_WEAKLY);
106 (void) IntBase<VY>::dispose(home);
107 return sizeof(*this);
108 }
109
110 template<class VY>
113 // Add assigned views to value set
114 if (IntView::me(med) == ME_INT_VAL)
115 add(home);
116
117 GECODE_ME_CHECK(y.gq(home, vs.size()));
118
119 if (x.size() == 0)
120 return home.ES_SUBSUMED(*this);
121
122 // All values must be in the value set
123 if (y.max() == vs.size())
124 return all_in_valset(home);
125
126 if (x.size() + vs.size() <= y.min())
127 return home.ES_SUBSUMED(*this);
128
129 // Compute positions of disjoint views
130 Region r;
131 int* dis; int n_dis;
132 disjoint(home,r,dis,n_dis);
133
134 // Some views might have been eliminated as they are subsumed
135 if (x.size() == 0)
136 return home.ES_SUBSUMED(*this);
137
138 // No lower bound pruning possible
139 if (n_dis == 0)
140 return ES_NOFIX;
141
142 // Do lower bound-based pruning
143 GECODE_ES_CHECK(prune_lower(home,dis,n_dis));
144
145 return ES_NOFIX;
146 }
147
148}}}
149
150// STATISTICS: int-prop
Home class for posting propagators
Definition core.hpp:856
void notice(Actor &a, ActorProperty p, bool duplicate=false)
Notice actor property.
Definition core.hpp:3223
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition int-base.hpp:53
ValSet vs
Value set storing the values of already assigned views.
Definition nvalues.hh:138
ExecStatus prune_lower(Space &home, int *dis, int n_dis)
Definition int-base.hpp:130
void disjoint(Space &home, Region &r, int *&dis, int &n_dis)
Definition int-base.hpp:80
void add(Space &home)
Add values of assigned views to value set.
Definition int-base.hpp:68
ExecStatus all_in_valset(Space &home)
Propagate that all views must take values from value set.
Definition int-base.hpp:120
IntBase(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-base.hpp:40
static ExecStatus post(Home home, ViewArray< IntView > &x, VY y)
Post propagator for .
Definition int-lq.hpp:48
LqInt(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-lq.hpp:41
virtual size_t dispose(Space &home)
Delete propagator and return its size.
Definition int-lq.hpp:104
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition int-lq.hpp:112
virtual Propagator * copy(Space &home)
Copy propagator during cloning.
Definition int-lq.hpp:98
static ExecStatus post(Home home, ViewArray< View > &x)
Post domain consistent propagator .
Definition eq.hpp:270
Class for storing values of already assigned views.
Definition val-set.hh:44
Base-class for propagators.
Definition core.hpp:1066
friend class Space
Definition core.hpp:1068
ModEventDelta med
A set of modification events (used during propagation)
Definition core.hpp:1077
Handle to region.
Definition region.hpp:55
static ModEvent me(const ModEventDelta &med)
Definition view.hpp:552
View arrays.
Definition array.hpp:253
ExecStatus ES_SUBSUMED(Propagator &p)
Propagator p is subsumed
Definition core.hpp:3570
void ignore(Actor &a, ActorProperty p, bool duplicate=false)
Ignore actor property.
Definition core.hpp:4081
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition macros.hpp:91
@ AP_WEAKLY
Definition core.hpp:568
Number of values propagators.
Finite domain integers.
const Gecode::ModEvent ME_INT_VAL
Domain operation has resulted in a value (assigned variable)
Definition var-type.hpp:56
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:773
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition core.hpp:475
#define forceinline
Definition config.hpp:194