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val.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2007
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10  * $Date: 2011-05-25 16:56:41 +0200 (Wed, 25 May 2011) $ by $Author: schulte $
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37 
38 namespace Gecode { namespace Int { namespace Circuit {
39 
40  /*
41  * The actual propagator
42  *
43  */
44  template<class View, class Offset>
47  : Base<View,Offset>(home,x,o) {}
48 
49  template<class View, class Offset>
51  Val<View,Offset>::Val(Space& home, bool share, Val<View,Offset>& p)
52  : Base<View,Offset>(home,share,p) {}
53 
54  template<class View, class Offset>
55  Actor*
56  Val<View,Offset>::copy(Space& home, bool share) {
57  return new (home) Val<View,Offset>(home,share,*this);
58  }
59 
60  template<class View, class Offset>
61  PropCost
62  Val<View,Offset>::cost(const Space&, const ModEventDelta&) const {
63  return PropCost::linear(PropCost::HI, x.size());
64  }
65 
66  template<class View, class Offset>
69  GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
70  ExecStatus esc = connected(home);
71  if (esc != ES_FIX)
72  return esc;
73  /*
74  * One cannot have a single unassigned view as the views constitute
75  * a permutation.
76  */
77  if (y.size() < 2)
78  return home.ES_SUBSUMED(*this);
79  return path(home);
80  }
81 
82  template<class View, class Offset>
85  int n = x.size();
86  if (n == 1) {
87  GECODE_ME_CHECK(o(x[0]).eq(home,0));
88  } else if (n == 2) {
89  GECODE_ME_CHECK(o(x[0]).eq(home,1));
90  GECODE_ME_CHECK(o(x[1]).eq(home,0));
91  } else {
92  for (int i=n; i--; ) {
93  GECODE_ME_CHECK(o(x[i]).gq(home,0));
94  GECODE_ME_CHECK(o(x[i]).le(home,n));
95  GECODE_ME_CHECK(o(x[i]).nq(home,i));
96  }
97  (void) new (home) Val<View,Offset>(home,x,o);
98  }
99  return ES_OK;
100  }
101 
102 }}}
103 
104 // STATISTICS: int-prop
105 
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition: core.hpp:4041
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
Val(Space &home, bool share, Val &p)
Constructor for cloning p.
Expensive.
Definition: core.hpp:564
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: val.hpp:68
void path(Home home, int offset, const IntVarArgs &x, IntVar s, IntVar e, IntConLevel icl)
Post propagator such that x forms a Hamiltonian path.
Definition: circuit.cpp:128
Propagation has computed fixpoint.
Definition: core.hpp:528
Computation spaces.
Definition: core.hpp:1362
Base-class for both propagators and branchers.
Definition: core.hpp:666
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Gecode::IntArgs i(4, 1, 2, 3, 4)
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
virtual Actor * copy(Space &home, bool share)
Copy propagator during cloning.
Definition: val.hpp:56
View arrays.
Definition: array.hpp:234
"Value-consistent" circuit propagator
Definition: circuit.hh:90
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
Converter with fixed offset.
Definition: view.hpp:617
static ExecStatus post(Home home, ViewArray< View > &x, Offset &o)
Post propagator for circuit on x.
Definition: val.hpp:84
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
Propagation cost.
Definition: core.hpp:537
ExecStatus
Definition: core.hpp:523
#define forceinline
Definition: config.hpp:132
Execution is okay.
Definition: core.hpp:527
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function (returns high linear)
Definition: val.hpp:62
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
Base-class for circuit propagator.
Definition: circuit.hh:59