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int-gq.hpp
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3 * Main authors:
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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
44 template<class VY>
45 inline ExecStatus
47 if (x.size() == 0) {
48 GECODE_ME_CHECK(y.lq(home,0));
49 return ES_OK;
50 }
51
52 x.unique();
53
54 if (x.size() == 1) {
55 GECODE_ME_CHECK(y.lq(home,1));
56 return ES_OK;
57 }
58
59 GECODE_ME_CHECK(y.lq(home,x.size()));
60
61 if (y.max() <= 1)
62 return ES_OK;
63
64 if (y.min() == x.size()) {
65 assert(y.assigned());
67 }
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.lq(home,n + vs.size()));
79
80 if (n == 0) {
81 assert(vs.size() >= y.max());
82 return ES_OK;
83 }
84
85 x.size(n);
86
87 (void) new (home) GqInt<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) GqInt<VY>(home, *this);
100 }
101
102 template<class VY>
105 if (IntView::me(med) == ME_INT_VAL)
106 add(home);
107
108 // Eliminate subsumed views
109 eliminate(home);
110
111 GECODE_ME_CHECK(y.lq(home, x.size() + vs.size()));
112
113 if (x.size() == 0)
114 return home.ES_SUBSUMED(*this);
115
116 if (vs.size() >= y.max())
117 return home.ES_SUBSUMED(*this);
118
120
121 return ES_NOFIX;
122 }
123
124}}}
125
126// STATISTICS: int-prop
Home class for posting propagators
Definition core.hpp:856
static ExecStatus post(Home home, ViewArray< View > &x)
Post propagator for views x.
Definition dom.hpp:45
static ExecStatus post(Home home, ViewArray< IntView > &x, VY y)
Post propagator for .
Definition int-gq.hpp:46
virtual Propagator * copy(Space &home)
Copy propagator during cloning.
Definition int-gq.hpp:98
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition int-gq.hpp:104
GqInt(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-gq.hpp:41
Graph g
View-value graph.
Definition nvalues.hh:263
ValSet vs
Value set storing the values of already assigned views.
Definition nvalues.hh:138
void add(Space &home)
Add values of assigned views to value set.
Definition int-base.hpp:68
void eliminate(Space &home)
Eliminate subsumed views (all values included in the value set vs)
Definition int-base.hpp:107
ExecStatus prune_upper(Space &home, Graph &g)
Definition int-base.hpp:298
IntBase(Home home, ValSet &vs, ViewArray< IntView > &x, VY y)
Constructor for posting.
Definition int-base.hpp:40
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
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
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
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
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