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dom.hpp
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4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2007
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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  Dom<View,Offset>::Dom(Space& home, bool share, Dom<View,Offset>& p)
52  : Base<View,Offset>(home,share,p) {}
53 
54  template<class View, class Offset>
55  Actor*
56  Dom<View,Offset>::copy(Space& home, bool share) {
57  return new (home) Dom<View,Offset>(home,share,*this);
58  }
59 
60  template<class View, class Offset>
61  PropCost
62  Dom<View,Offset>::cost(const Space&, const ModEventDelta& med) const {
63  if (View::me(med) == Int::ME_INT_VAL)
64  return PropCost::linear(PropCost::LO, x.size());
65  else
66  return PropCost::quadratic(PropCost::HI, x.size());
67  }
68 
69  template<class View, class Offset>
70  void
72  for (int i=y.size(); i--; )
73  if (y[i].assigned()) {
74  View::schedule(home, *this, ME_INT_VAL);
75  return;
76  }
77  View::schedule(home, *this, ME_INT_DOM);
78  }
79 
80  template<class View, class Offset>
83  if (View::me(med) == Int::ME_INT_VAL) {
84  GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
85  ExecStatus escv = connected(home);
86  if (escv != ES_FIX)
87  return escv;
88  if (y.size() < 2)
89  return home.ES_SUBSUMED(*this);
90  return home.ES_FIX_PARTIAL(*this,View::med(Int::ME_INT_DOM));
91  }
92 
93  if (dc.available()) {
94  GECODE_ES_CHECK(dc.sync(home));
95  } else {
96  GECODE_ES_CHECK(dc.init(home,y));
97  }
98  bool assigned;
99  GECODE_ES_CHECK(dc.propagate(home,assigned));
100 
101  ExecStatus esc = connected(home);
102  if (esc != ES_FIX)
103  return esc;
104 
105  // Elminiate assigned views from y, as they have been assigned
106  // and propagated by domain consistent propagation. This is required
107  // as we need to know how many assigned views actually exist.
108  if (assigned)
109  for (int i=y.size(); i--; )
110  if (y[i].assigned())
111  y.move_lst(i);
112 
113  return path(home);
114  }
115 
116  template<class View, class Offset>
117  ExecStatus
119  int n = x.size();
120  if (n == 1) {
121  GECODE_ME_CHECK(o(x[0]).eq(home,0));
122  } else if (n == 2) {
123  GECODE_ME_CHECK(o(x[0]).eq(home,1));
124  GECODE_ME_CHECK(o(x[1]).eq(home,0));
125  } else {
126  for (int i=n; i--; ) {
127  GECODE_ME_CHECK(o(x[i]).gq(home,0));
128  GECODE_ME_CHECK(o(x[i]).le(home,n));
129  GECODE_ME_CHECK(o(x[i]).nq(home,i));
130  }
131  (void) new (home) Dom<View,Offset>(home,x,o);
132  }
133  return ES_OK;
134  }
135 
136 }}}
137 
138 // STATISTICS: int-prop
139 
static PropCost quadratic(PropCost::Mod m, unsigned int n)
Quadratic complexity for modifier m and size measure n.
Definition: core.hpp:4832
static PropCost linear(PropCost::Mod m, unsigned int n)
Linear complexity for modifier pcm and size measure n.
Definition: core.hpp:4841
virtual PropCost cost(const Space &home, const ModEventDelta &med) const
Cost function.
Definition: dom.hpp:62
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3614
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: dom.hpp:82
void path(Home home, int offset, const IntVarArgs &x, IntVar s, IntVar e, IntPropLevel ipl)
Post propagator such that x forms a Hamiltonian path.
Definition: circuit.cpp:128
Propagation has computed fixpoint.
Definition: core.hpp:545
Computation spaces.
Definition: core.hpp:1748
Base-class for both propagators and branchers.
Definition: core.hpp:696
virtual Actor * copy(Space &home, bool share)
Copy propagator during cloning.
Definition: dom.hpp:56
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:95
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 void reschedule(Space &home)
Schedule function.
Definition: dom.hpp:71
const Gecode::ModEvent ME_INT_VAL
Domain operation has resulted in a value (assigned variable)
Definition: var-type.hpp:56
Expensive.
Definition: core.hpp:582
View arrays.
Definition: array.hpp:234
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
ExecStatus ES_FIX_PARTIAL(Propagator &p, const ModEventDelta &med)
Propagator p has computed partial fixpoint
Definition: core.hpp:3620
Converter with fixed offset.
Definition: view.hpp:617
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:784
static ExecStatus post(Home home, ViewArray< View > &x, Offset &o)
Post propagator for circuit on x.
Definition: dom.hpp:118
Propagation cost.
Definition: core.hpp:554
const Gecode::ModEvent ME_INT_DOM
Domain operation has changed the domain.
Definition: var-type.hpp:72
ExecStatus
Definition: core.hpp:540
bool assigned(View x, int v)
Whether x is assigned to value v.
Definition: single.hpp:47
#define forceinline
Definition: config.hpp:173
Post propagator for SetVar x
Definition: set.hh:784
Execution is okay.
Definition: core.hpp:544
Dom(Space &home, bool share, Dom &p)
Constructor for cloning p.
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:169
Home class for posting propagators
Definition: core.hpp:922
Base-class for circuit propagator.
Definition: circuit.hh:59
"Domain consistent" circuit propagator
Definition: circuit.hh:125