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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 * Guido Tack <tack@gecode.org>
6 *
7 * Copyright:
8 * Christian Schulte, 2014
9 * Guido Tack, 2012
10 *
11 * This file is part of Gecode, the generic constraint
12 * development environment:
13 * http://www.gecode.org
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining
16 * a copy of this software and associated documentation files (the
17 * "Software"), to deal in the Software without restriction, including
18 * without limitation the rights to use, copy, modify, merge, publish,
19 * distribute, sublicense, and/or sell copies of the Software, and to
20 * permit persons to whom the Software is furnished to do so, subject to
21 * the following conditions:
22 *
23 * The above copyright notice and this permission notice shall be
24 * included in all copies or substantial portions of the Software.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
30 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
31 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
32 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 *
34 */
35
36#include <gecode/search/support.hh>
37#include <gecode/search/seq/dead.hh>
38
39namespace Gecode { namespace Search { namespace Seq {
40
41 /// Create stop object
42 GECODE_SEARCH_EXPORT Stop*
43 rbsstop(Stop* so);
44
45 /// Create restart engine
46 GECODE_SEARCH_EXPORT Engine*
47 rbsengine(Space* master, Stop* stop, Engine* slave,
48 const Search::Statistics& stat, const Options& opt,
49 bool best);
50
51}}}
52
53namespace Gecode { namespace Search {
54
55 /// A RBS engine builder
56 template<class T, template<class> class E>
57 class RbsBuilder : public Builder {
58 using Builder::opt;
59 public:
60 /// The constructor
61 RbsBuilder(const Options& opt);
62 /// The actual build function
63 virtual Engine* operator() (Space* s) const;
64 };
65
66 template<class T, template<class> class E>
67 inline
68 RbsBuilder<T,E>::RbsBuilder(const Options& opt)
69 : Builder(opt,E<T>::best) {}
70
71 template<class T, template<class> class E>
72 Engine*
73 RbsBuilder<T,E>::operator() (Space* s) const {
74 return build<T,RBS<T,E> >(s,opt);
75 }
76
77}}
78
79namespace Gecode {
80
81 template<class T, template<class> class E>
82 inline
83 RBS<T,E>::RBS(T* s, const Search::Options& m_opt) {
84 if (m_opt.cutoff == nullptr)
85 throw Search::UninitializedCutoff("RBS::RBS");
86 Search::Options e_opt(m_opt.expand());
87 Search::Statistics stat;
88 e_opt.clone = false;
89 e_opt.stop = Search::Seq::rbsstop(m_opt.stop);
90 Search::WrapTraceRecorder::engine(e_opt.tracer,
91 SearchTracer::EngineType::RBS, 1U);
92 if (s->status(stat) == SS_FAILED) {
93 stat.fail++;
94 if (!m_opt.clone)
95 delete s;
96 e = Search::Seq::dead(e_opt, stat);
97 } else {
98 Space* master = m_opt.clone ? s->clone() : s;
99 Space* slave = master->clone();
100 MetaInfo mi(0,0,0,nullptr,NoGoods::eng);
101 slave->slave(mi);
102 e = Search::Seq::rbsengine(master,e_opt.stop,
103 Search::build<T,E>(slave,e_opt),
104 stat,m_opt,E<T>::best);
105 }
106 }
107
108
109 template<class T, template<class> class E>
110 inline T*
111 rbs(T* s, const Search::Options& o) {
112 RBS<T,E> r(s,o);
113 return r.next();
114 }
115
116 template<class T, template<class> class E>
117 SEB
118 rbs(const Search::Options& o) {
119 if (o.cutoff == nullptr)
120 throw Search::UninitializedCutoff("rbs");
121 return new Search::RbsBuilder<T,E>(o);
122 }
123
124
125}
126
127// STATISTICS: search-seq