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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, 2011
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
34#include <gecode/int/rel.hh>
35#include <gecode/int/bool.hh>
36
37namespace Gecode { namespace Int { namespace NValues {
38
39 template<class VY>
40 forceinline
41 EqBool<VY>::EqBool(Home home, int status, ViewArray<BoolView>& x, VY y)
42 : BoolBase<VY>(home,status,x,y) {}
43
44 template<class VY>
45 forceinline
46 EqBool<VY>::EqBool(Space& home, EqBool<VY>& p)
47 : BoolBase<VY>(home,p) {}
48
49 template<class VY>
50 Actor*
51 EqBool<VY>::copy(Space& home) {
52 return new (home) EqBool<VY>(home,*this);
53 }
54
55 template<class VY>
56 inline ExecStatus
57 EqBool<VY>::post(Home home, ViewArray<BoolView>& x, VY y) {
58 if (x.size() == 0) {
59 GECODE_ME_CHECK(y.eq(home,0));
60 return ES_OK;
61 }
62
63 x.unique();
64
65 if (x.size() == 1) {
66 GECODE_ME_CHECK(y.eq(home,1));
67 return ES_OK;
68 }
69
70 GECODE_ME_CHECK(y.gq(home,1));
71 GECODE_ME_CHECK(y.lq(home,2));
72
73 if (y.max() == 1) {
74 assert(y.assigned());
75 ViewArray<BoolView> xc(home,x);
76 return Bool::NaryEq<BoolView>::post(home,xc);
77 }
78
79 if (y.min() == 2) {
80 assert(y.assigned());
81 ViewArray<BoolView> xc(home,x);
82 return Rel::NaryNq<BoolView>::post(home,xc);
83 }
84
85 int n = x.size();
86 int status = 0;
87 for (int i=n; i--; )
88 if (x[i].zero()) {
89 if (status & VS_ONE) {
90 GECODE_ME_CHECK(y.eq(home,2));
91 return ES_OK;
92 }
93 x[i] = x[--n];
94 status |= VS_ZERO;
95 } else if (x[i].one()) {
96 if (status & VS_ZERO) {
97 GECODE_ME_CHECK(y.eq(home,2));
98 return ES_OK;
99 }
100 x[i] = x[--n];
101 status |= VS_ONE;
102 }
103
104 assert(status != (VS_ZERO | VS_ONE));
105 if (n == 0) {
106 assert(status != 0);
107 GECODE_ME_CHECK(y.eq(home,1));
108 return ES_OK;
109 }
110 x.size(n);
111
112 (void) new (home) EqBool<VY>(home,status,x,y);
113 return ES_OK;
114 }
115
116 template<class VY>
117 ExecStatus
118 EqBool<VY>::propagate(Space& home, const ModEventDelta&) {
119 if (status == (VS_ZERO | VS_ONE)) {
120 GECODE_ME_CHECK(y.eq(home,2));
121 return home.ES_SUBSUMED(*this);
122 }
123
124 if (c.empty()) {
125 assert(status != 0);
126 GECODE_ME_CHECK(y.eq(home,1));
127 return home.ES_SUBSUMED(*this);
128 }
129
130 if (y.max() == 1) {
131 if (status == VS_ZERO) {
132 // Mark that everything is done
133 status = VS_ZERO | VS_ONE;
134 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
135 GECODE_ME_CHECK(as.advisor().view().zero(home));
136 return home.ES_SUBSUMED(*this);
137 }
138 if (status == VS_ONE) {
139 // Mark that everything is done
140 status = VS_ZERO | VS_ONE;
141 for (Advisors<ViewAdvisor<BoolView> > as(c); as(); ++as)
142 GECODE_ME_CHECK(as.advisor().view().one(home));
143 return home.ES_SUBSUMED(*this);
144 }
145 }
146
147 if (y.min() == 2) {
148 Advisors<ViewAdvisor<BoolView> > as(c);
149 assert(as());
150 ViewAdvisor<BoolView>& a(as.advisor());
151 ++as;
152 if (!as()) {
153 // Only a single view is left
154 if (status == VS_ZERO) {
155 GECODE_ME_CHECK(a.view().one(home));
156 } else if (status == VS_ONE) {
157 GECODE_ME_CHECK(a.view().zero(home));
158 } else {
159 return ES_FAILED;
160 }
161 return home.ES_SUBSUMED(*this);
162 }
163 }
164
165 return ES_FIX;
166 }
167
168}}}
169
170// STATISTICS: int-prop