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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, 2015
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/search/seq/dead.hh>
35
36namespace Gecode { namespace Search { namespace Seq {
37
38 /// A dead engine (failed root)
39 template<class Tracer>
40 class GECODE_SEARCH_EXPORT Dead : public Engine {
41 protected:
42 /// Search tracer
43 Tracer tracer;
44 /// Statistics
45 Statistics stat;
46 public:
47 /// Initialize
48 Dead(const Options& o, const Statistics& stat0);
49 /// Return next solution (nullptr, if none exists or search has been stopped)
50 virtual Space* next(void);
51 /// Return statistics
52 virtual Statistics statistics(void) const;
53 /// Check whether engine has been stopped
54 virtual bool stopped(void) const;
55 /// Delete
56 virtual ~Dead(void);
57 };
58
59 template<class Tracer>
60 Dead<Tracer>::Dead(const Options& o, const Statistics& stat0)
61 : tracer(o.tracer), stat(stat0) {
62 tracer.engine(SearchTracer::EngineType::AOE, 1U);
63 tracer.worker();
64 }
65
66 template<class Tracer>
67 Space*
68 Dead<Tracer>::next(void) {
69 return nullptr;
70 }
71
72 template<class Tracer>
73 bool
74 Dead<Tracer>::stopped(void) const {
75 return false;
76 }
77
78 template<class Tracer>
79 Statistics
80 Dead<Tracer>::statistics(void) const {
81 return stat;
82 }
83
84 template<class Tracer>
85 Dead<Tracer>::~Dead(void) {
86 tracer.done();
87 }
88
89 Engine*
90 dead(const Options& o, const Statistics& stat) {
91 if (o.tracer)
92 return new Dead<TraceRecorder>(o,stat);
93 else
94 return new Dead<NoTraceRecorder>(o,stat);
95 }
96
97
98}}}
99
100// STATISTICS: search-seq