Generated on Tue Mar 5 2013 22:37:18 for Gecode by doxygen 1.8.3.1
val.hpp
Go to the documentation of this file.
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
8  *
9  * Last modified:
10  * $Date: 2011-05-26 00:56:41 +1000 (Thu, 26 May 2011) $ by $Author: schulte $
11  * $Revision: 12022 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
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