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dekker.one
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 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34namespace Gecode { namespace Int { namespace Circuit {
35
36 /*
37 * The actual propagator
38 *
39 */
40 template<class View, class Offset>
41 forceinline
42 Val<View,Offset>::Val(Home home, ViewArray<View>& x, Offset& o)
43 : Base<View,Offset>(home,x,o) {}
44
45 template<class View, class Offset>
46 forceinline
47 Val<View,Offset>::Val(Space& home, Val<View,Offset>& p)
48 : Base<View,Offset>(home,p) {}
49
50 template<class View, class Offset>
51 Actor*
52 Val<View,Offset>::copy(Space& home) {
53 return new (home) Val<View,Offset>(home,*this);
54 }
55
56 template<class View, class Offset>
57 PropCost
58 Val<View,Offset>::cost(const Space&, const ModEventDelta&) const {
59 return PropCost::linear(PropCost::HI, x.size());
60 }
61
62 template<class View, class Offset>
63 ExecStatus
64 Val<View,Offset>::propagate(Space& home, const ModEventDelta&) {
65 GECODE_ES_CHECK((Int::Distinct::prop_val<View,true>(home,y)));
66 ExecStatus esc = connected(home);
67 if (esc != ES_FIX)
68 return esc;
69 /*
70 * One cannot have a single unassigned view as the views constitute
71 * a permutation.
72 */
73 if (y.size() < 2)
74 return home.ES_SUBSUMED(*this);
75 return path(home);
76 }
77
78 template<class View, class Offset>
79 ExecStatus
80 Val<View,Offset>::post(Home home, ViewArray<View>& x, Offset& o) {
81 int n = x.size();
82 if (n == 1) {
83 GECODE_ME_CHECK(o(x[0]).eq(home,0));
84 } else if (n == 2) {
85 GECODE_ME_CHECK(o(x[0]).eq(home,1));
86 GECODE_ME_CHECK(o(x[1]).eq(home,0));
87 } else {
88 for (int i=0; i<n; i++) {
89 GECODE_ME_CHECK(o(x[i]).gq(home,0));
90 GECODE_ME_CHECK(o(x[i]).le(home,n));
91 GECODE_ME_CHECK(o(x[i]).nq(home,i));
92 }
93 (void) new (home) Val<View,Offset>(home,x,o);
94 }
95 return ES_OK;
96 }
97
98}}}
99
100// STATISTICS: int-prop
101