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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, 2019
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/order.hh>
35
36namespace Gecode { namespace Int { namespace Order {
37
38 Actor*
39 OrderProp::copy(Space& home) {
40 return new (home) OrderProp(home,*this);
41 }
42
43 PropCost
44 OrderProp::cost(const Space&, const ModEventDelta&) const {
45 return PropCost::binary(PropCost::LO);
46 }
47
48 void
49 OrderProp::reschedule(Space& home) {
50 s0.reschedule(home,*this,PC_INT_BND);
51 s1.reschedule(home,*this,PC_INT_BND);
52 b.reschedule(home,*this,PC_INT_VAL);
53 }
54
55 ExecStatus
56 OrderProp::propagate(Space& home, const ModEventDelta&) {
57 if (s0.max() + p0 <= s1.min()) {
58 GECODE_ME_CHECK(b.zero(home));
59 return home.ES_SUBSUMED(*this);
60 } else if (s1.max() + p1 <= s0.min()) {
61 GECODE_ME_CHECK(b.one(home));
62 return home.ES_SUBSUMED(*this);
63 } else if ((s1.min() + p1 > s0.max()) || b.zero()) {
64 GECODE_ME_CHECK(b.zero(home));
65 GECODE_REWRITE(*this,(Rel::Lq<OffsetView,IntView>::post
66 (home(*this),OffsetView(s0,p0),s1)));
67 } else if ((s0.min() + p0 > s1.max()) || b.one()) {
68 GECODE_ME_CHECK(b.one(home));
69 GECODE_REWRITE(*this,(Rel::Lq<OffsetView,IntView>::post
70 (home(*this),OffsetView(s1,p1),s0)));
71 }
72 return ES_FIX;
73 }
74
75 size_t
76 OrderProp::dispose(Space& home) {
77 s0.cancel(home,*this,PC_INT_BND);
78 s1.cancel(home,*this,PC_INT_BND);
79 b.cancel(home,*this,PC_INT_VAL);
80 (void) Propagator::dispose(home);
81 return sizeof(*this);
82 }
83
84}}}
85
86// STATISTICS: int-prop