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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 Channel {
35
36 forceinline
37 LinkMulti::LinkMulti(Home home, ViewArray<BoolView>& x, IntView y, int o0)
38 : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
39 (home,x,y), c(home), status(S_NONE), o(o0) {
40 x.subscribe(home,*new (home) Advisor(home,*this,c));
41 // Propagator is scheduled because of the dependency subscription
42 }
43
44 forceinline
45 LinkMulti::LinkMulti(Space& home, LinkMulti& p)
46 : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
47 (home,p), status(S_NONE), o(p.o) {
48 assert(p.status == S_NONE);
49 c.update(home,p.c);
50 }
51
52 forceinline ExecStatus
53 LinkMulti::post(Home home, ViewArray<BoolView>& x, IntView y, int o) {
54 int n=x.size();
55 GECODE_ME_CHECK(y.gq(home,o));
56 GECODE_ME_CHECK(y.lq(home,o+n-1));
57 assert(n > 0);
58 if (n == 1) {
59 GECODE_ME_CHECK(x[0].one(home));
60 assert(y.val() == o);
61 } else if (y.assigned()) {
62 int j=y.val()-o;
63 GECODE_ME_CHECK(x[j].one(home));
64 for (int i=0; i<j; i++)
65 GECODE_ME_CHECK(x[i].zero(home));
66 for (int i=j+1; i<n; i++)
67 GECODE_ME_CHECK(x[i].zero(home));
68 } else {
69 for (int i=0; i<n; i++)
70 if (x[i].one()) {
71 for (int j=0; j<i; j++)
72 GECODE_ME_CHECK(x[j].zero(home));
73 for (int j=i+1; j<n; j++)
74 GECODE_ME_CHECK(x[j].zero(home));
75 GECODE_ME_CHECK(y.eq(home,o+i));
76 return ES_OK;
77 } else if (x[i].zero()) {
78 GECODE_ME_CHECK(y.nq(home,o+i));
79 }
80 (void) new (home) LinkMulti(home,x,y,o);
81 }
82 return ES_OK;
83 }
84
85}}}
86
87// STATISTICS: int-prop
88