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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, 2009
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_SEQ_DFS_HH
35#define GECODE_SEARCH_SEQ_DFS_HH
36
37#include <gecode/search.hh>
38#include <gecode/search/support.hh>
39#include <gecode/search/worker.hh>
40#include <gecode/search/seq/path.hh>
41
42namespace Gecode { namespace Search { namespace Seq {
43
44 /// Depth-first search engine implementation
45 template<class Tracer>
46 class DFS : public Worker {
47 private:
48 /// Search tracer
49 Tracer tracer;
50 /// Search options
51 Options opt;
52 /// Current path ins search tree
53 Path<Tracer> path;
54 /// Current space being explored
55 Space* cur;
56 /// Distance until next clone
57 unsigned int d;
58 public:
59 /// Initialize for space \a s with options \a o
60 DFS(Space* s, const Options& o);
61 /// %Search for next solution
62 Space* next(void);
63 /// Return statistics
64 Statistics statistics(void) const;
65 /// Constrain future solutions to be better than \a b (should never be called)
66 void constrain(const Space& b);
67 /// Reset engine to restart at space \a s
68 void reset(Space* s);
69 /// Return no-goods
70 NoGoods& nogoods(void);
71 /// Destructor
72 ~DFS(void);
73 };
74
75}}}
76
77#include <gecode/search/seq/dfs.hpp>
78
79#endif
80
81// STATISTICS: search-seq