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int-lq.hpp
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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 LqInt<VX,VY>::LqInt(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 if (c < 0)
59 return ES_FAILED;
60 if (c >= n_x)
61 return ES_OK;
62 // All views must be different
63 if (c == 0)
64 return post_false(home,x,y);
65 (void) new (home) LqInt<VX,VY>(home,x,n_x-c+1,y,c);
66 return ES_OK;
67 }
68
69 template<class VX, class VY>
72 : IntBase<VX,VY>(home,p) {}
73
74 template<class VX, class VY>
75 Actor*
77 return new (home) LqInt<VX,VY>(home,*this);
78 }
79
80 template<class VX, class VY>
83 // Eliminate decided views from subscribed views
84 int n_x = x.size();
85 for (int i=n_s; i--; )
86 switch (holds(x[i],y)) {
87 case RT_FALSE:
88 x[i].cancel(home,*this,PC_INT_DOM);
89 x[i]=x[--n_s]; x[n_s]=x[--n_x];
90 break;
91 case RT_TRUE:
92 x[i].cancel(home,*this,PC_INT_DOM);
93 x[i]=x[--n_s]; x[n_s]=x[--n_x]; c--;
94 break;
95 case RT_MAYBE:
96 break;
97 default:
99 }
100 x.size(n_x);
101 if (c < 0)
102 return ES_FAILED;
103 if (c >= n_x)
104 return home.ES_SUBSUMED(*this);
105 // Eliminate decided views from unsubscribed views
106 for (int i=n_x; i-- > n_s; )
107 switch (holds(x[i],y)) {
108 case RT_FALSE: x[i]=x[--n_x]; break;
109 case RT_TRUE: x[i]=x[--n_x]; c--; break;
110 case RT_MAYBE: break;
111 default: GECODE_NEVER;
112 }
113 x.size(n_x);
114 if (c < 0)
115 return ES_FAILED;
116 if (c >= n_x)
117 return home.ES_SUBSUMED(*this);
118 if (c == 0) {
119 // All views must be different
121 return home.ES_SUBSUMED(*this);
122 }
123 // Now, there must be new subscriptions from x[n_s] up to x[n_x-c+1]
124 int m = n_x-c;
125 while (n_s <= m)
126 x[n_s++].subscribe(home,*this,PC_INT_DOM,false);
127 return ES_FIX;
128 }
129
130}}}
131
132// 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
Baseclass for count propagators (integer)
Definition count.hh:138
Propagator for counting views (less or equal integer to number of equal views)
Definition count.hh:232
static ExecStatus post(Home home, ViewArray< VX > &x, VY y, int c)
Post propagator for .
Definition int-lq.hpp:43
LqInt(Space &home, LqInt &p)
Constructor for cloning p.
Definition int-lq.hpp:71
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition int-lq.hpp:76
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition int-lq.hpp:82
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_false(Home home, ViewArray< VX > &x, VX y)
Post that all views in x are not equal to y.
Definition rel.hpp:251
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