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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Jip J. Dekker <jip.dekker@monash.edu>
5 *
6 * Copyright:
7 * Jip J. Dekker, 2018
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 "lastval.hh"
35
36namespace Gecode { namespace FlatZinc {
37
38
39 LastVal::LastVal(Space &home, LastVal &p)
40 : UnaryPropagator<IntView, PC_INT_VAL>(home,p), s(p.s) {}
41
42 LastVal::LastVal(Home home, Int::IntView x0, std::shared_ptr<int> s)
43 : s(s), UnaryPropagator<IntView, PC_INT_VAL>(home, x0) {
44 (*s) = x0.min();
45 }
46
47 Actor* LastVal::copy(Space &home) {
48 return new (home) LastVal(home,*this);
49 }
50
51 PropCost LastVal::cost(const Space &home, const ModEventDelta &med) const {
52 return PropCost::record();
53 }
54
55 ExecStatus LastVal::propagate(Space &home, const ModEventDelta &med) {
56 assert(x0.assigned());
57 (*s) = x0.val();
58 return home.ES_SUBSUMED(*this);
59 }
60
61 ExecStatus LastVal::post(Home home, Int::IntView x0, std::shared_ptr<int> s) {
62 if (x0.assigned()) {
63 (*s) = x0.val();
64 } else {
65 (void) new (home) LastVal(home, x0, s);
66 }
67 return ES_OK;
68 }
69
70
71}}