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dom.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2007
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9  * Last modified:
10  * $Date: 2011-09-06 22:19:49 +1000 (Tue, 06 Sep 2011) $ by $Author: schulte $
11  * $Revision: 12393 $
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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>
72  if (View::me(med) == Int::ME_INT_VAL) {
73  GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
74  ExecStatus escv = connected(home);
75  if (escv != ES_FIX)
76  return escv;
77  if (y.size() < 2)
78  return home.ES_SUBSUMED(*this);
79  return home.ES_FIX_PARTIAL(*this,View::med(Int::ME_INT_DOM));
80  }
81 
82  if (dc.available()) {
83  GECODE_ES_CHECK(dc.sync(home));
84  } else {
85  GECODE_ES_CHECK(dc.init(home,y));
86  }
87  bool assigned;
88  GECODE_ES_CHECK(dc.propagate(home,assigned));
89 
90  ExecStatus esc = connected(home);
91  if (esc != ES_FIX)
92  return esc;
93 
94  // Elminiate assigned views from y, as they have been assigned
95  // and propagated by domain consistent propagation. This is required
96  // as we need to know how many assigned views actually exist.
97  if (assigned)
98  for (int i=y.size(); i--; )
99  if (y[i].assigned())
100  y.move_lst(i);
101 
102  return path(home);
103  }
104 
105  template<class View, class Offset>
106  ExecStatus
108  int n = x.size();
109  if (n == 1) {
110  GECODE_ME_CHECK(o(x[0]).eq(home,0));
111  } else if (n == 2) {
112  GECODE_ME_CHECK(o(x[0]).eq(home,1));
113  GECODE_ME_CHECK(o(x[1]).eq(home,0));
114  } else {
115  for (int i=n; i--; ) {
116  GECODE_ME_CHECK(o(x[i]).gq(home,0));
117  GECODE_ME_CHECK(o(x[i]).le(home,n));
118  GECODE_ME_CHECK(o(x[i]).nq(home,i));
119  }
120  (void) new (home) Dom<View,Offset>(home,x,o);
121  }
122  return ES_OK;
123  }
124 
125 }}}
126 
127 // STATISTICS: int-prop
128