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int-gq.hpp
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3 * Main authors:
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7 * Christian Schulte, 2006
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33
34namespace Gecode { namespace Int { namespace Count {
35
36 template<class VX, class VY>
38 GqInt<VX,VY>::GqInt(Home home, ViewArray<VX>& x, int n_s, VY y, int c)
39 : IntBase<VX,VY>(home,x,n_s,y,c) {}
40
41 template<class VX, class VY>
44 // Eliminate decided views
45 int n_x = x.size();
46 for (int i=n_x; i--; )
47 switch (holds(x[i],y)) {
48 case RT_FALSE:
49 x[i] = x[--n_x]; break;
50 case RT_TRUE:
51 x[i] = x[--n_x]; c--; break;
52 case RT_MAYBE:
53 break;
54 default:
56 }
57 x.size(n_x);
58 // RHS too large
59 if (n_x < c)
60 return ES_FAILED;
61 // Whatever the x[i] take for values, the inequality is subsumed
62 if (c <= 0)
63 return ES_OK;
64 // All views must be equal
65 if (c == n_x)
66 return post_true(home,x,y);
67 (void) new (home) GqInt<VX,VY>(home,x,c+1,y,c);
68 return ES_OK;
69 }
70
71 template<class VX, class VY>
74 : IntBase<VX,VY>(home,p) {}
75
76 template<class VX, class VY>
77 Actor*
79 return new (home) GqInt<VX,VY>(home,*this);
80 }
81
82 template<class VX, class VY>
85 // Eliminate decided views from subscribed views
86 int n_x = x.size();
87 for (int i=n_s; i--; )
88 switch (holds(x[i],y)) {
89 case RT_FALSE:
90 x[i].cancel(home,*this,PC_INT_DOM);
91 x[i]=x[--n_s]; x[n_s]=x[--n_x];
92 break;
93 case RT_TRUE:
94 x[i].cancel(home,*this,PC_INT_DOM);
95 x[i]=x[--n_s]; x[n_s]=x[--n_x]; c--;
96 break;
97 case RT_MAYBE:
98 break;
99 default:
101 }
102 x.size(n_x);
103 if (n_x < c)
104 return ES_FAILED;
105 if (c <= 0)
106 return home.ES_SUBSUMED(*this);
107 // Eliminate decided views from unsubscribed views
108 for (int i=n_x; i-- > n_s; )
109 switch (holds(x[i],y)) {
110 case RT_FALSE: x[i]=x[--n_x]; break;
111 case RT_TRUE: x[i]=x[--n_x]; c--; break;
112 case RT_MAYBE: break;
113 default: GECODE_NEVER;
114 }
115 x.size(n_x);
116 if (n_x < c)
117 return ES_FAILED;
118 if (c <= 0)
119 return home.ES_SUBSUMED(*this);
120 if (c == n_x) {
121 // All views must be equal
123 return home.ES_SUBSUMED(*this);
124 }
125 // Now, there must be new subscriptions from x[n_s] up to x[c+1]
126 while (n_s <= c)
127 x[n_s++].subscribe(home,*this,PC_INT_DOM,false);
128 return ES_FIX;
129 }
130
131}}}
132
133// STATISTICS: int-prop
int p
Number of positive literals for node type.
Base-class for both propagators and branchers.
Definition core.hpp:628
Home class for posting propagators
Definition core.hpp:856
Propagator for counting views (greater or equal integer to number of equal views)
Definition count.hh:202
GqInt(Space &home, GqInt &p)
Constructor for cloning p.
Definition int-gq.hpp:73
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition int-gq.hpp:43
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition int-gq.hpp:84
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition int-gq.hpp:78
Baseclass for count propagators (integer)
Definition count.hh:138
Computation spaces.
Definition core.hpp:1742
View arrays.
Definition array.hpp:253
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition macros.hpp:91
ExecStatus post_true(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are equal to y.
Definition rel.hpp:237
RelTest holds(VX x, VX y)
Test whether x and y are equal.
Definition rel.hpp:145
const Gecode::PropCond PC_INT_DOM
Propagate when domain changes.
Definition var-type.hpp:100
@ RT_TRUE
Relation does hold.
Definition view.hpp:1737
@ RT_MAYBE
Relation may hold or not.
Definition view.hpp:1736
@ RT_FALSE
Relation does not hold.
Definition view.hpp:1735
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar y
Definition set.hh:767
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
Post propagator for SetVar x
Definition set.hh:767
#define forceinline
Definition config.hpp:187
#define GECODE_NEVER
Assert that this command is never executed.
Definition macros.hpp:56