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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, 2008
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#ifndef GECODE_SEARCH_SUPPORT_HH
35#define GECODE_SEARCH_SUPPORT_HH
36
37#include <gecode/search.hh>
38
39namespace Gecode { namespace Search {
40
41 /// Clone space \a s dependening on options \a o
42 forceinline Space*
43 snapshot(Space* s, const Options& o);
44
45 /// Virtualize a worker to an engine
46 template<class Worker>
47 class WorkerToEngine : public Engine {
48 protected:
49 /// The worker to wrap into an engine
50 Worker w;
51 public:
52 /// Initialization
53 WorkerToEngine(Space* s, const Options& o);
54 /// Return next solution (nullptr, if none exists or search has been stopped)
55 virtual Space* next(void);
56 /// Return statistics
57 virtual Search::Statistics statistics(void) const;
58 /// Check whether engine has been stopped
59 virtual bool stopped(void) const;
60 /// Constrain future solutions to be better than \a b
61 virtual void constrain(const Space& b);
62 /// Reset engine to restart at space \a s
63 virtual void reset(Space* s);
64 /// Return no-goods
65 virtual NoGoods& nogoods(void);
66 };
67
68
69
70 forceinline Space*
71 snapshot(Space* s, const Options& o) {
72 return o.clone ? s->clone() : s;
73 }
74
75
76 template<class Worker>
77 WorkerToEngine<Worker>::WorkerToEngine(Space* s, const Options& o)
78 : w(s,o) {}
79 template<class Worker>
80 Space*
81 WorkerToEngine<Worker>::next(void) {
82 return w.next();
83 }
84 template<class Worker>
85 Search::Statistics
86 WorkerToEngine<Worker>::statistics(void) const {
87 return w.statistics();
88 }
89 template<class Worker>
90 bool
91 WorkerToEngine<Worker>::stopped(void) const {
92 return w.stopped();
93 }
94 template<class Worker>
95 void
96 WorkerToEngine<Worker>::reset(Space* s) {
97 w.reset(s);
98 }
99 template<class Worker>
100 void
101 WorkerToEngine<Worker>::constrain(const Space& b) {
102 w.constrain(b);
103 }
104 template<class Worker>
105 NoGoods&
106 WorkerToEngine<Worker>::nogoods(void) {
107 return w.nogoods();
108 }
109
110}}
111
112#endif
113
114// STATISTICS: search-other