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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, 2013
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_NOGOODS_HH
35#define GECODE_SEARCH_NOGOODS_HH
36
37#include <gecode/search.hh>
38
39namespace Gecode { namespace Search {
40
41 /// Class for a sentinel no-good literal
42 class GECODE_VTABLE_EXPORT NoNGL : public NGL {
43 public:
44 /// Constructor for creation
45 NoNGL(void);
46 /// Constructor for creation
47 NoNGL(Space& home);
48 /// Constructor for cloning \a ngl
49 NoNGL(Space& home, NoNGL& ngl);
50 /// Subscribe propagator \a p to all views of the no-good literal
51 virtual void subscribe(Space& home, Propagator& p);
52 /// Schedule propagator \a p for all views of the no-good literal
53 virtual void reschedule(Space& home, Propagator& p);
54 /// Cancel propagator \a p from all views of the no-good literal
55 virtual void cancel(Space& home, Propagator& p);
56 /// Test the status of the no-good literal
57 virtual NGL::Status status(const Space& home) const;
58 /// Propagate the negation of the no-good literal
59 virtual ExecStatus prune(Space& home);
60 /// Create copy
61 virtual NGL* copy(Space& home);
62 };
63
64 /// No-good propagator
65 class GECODE_SEARCH_EXPORT NoGoodsProp : public Propagator {
66 protected:
67 /// Root of no-good literal tree
68 NGL* root;
69 /// Number of no-good literals with subscriptions
70 unsigned int n;
71 /// Constructor for creation
72 NoGoodsProp(Space& home, NGL* root);
73 /// Constructor for cloning \a p
74 NoGoodsProp(Space& home, NoGoodsProp& p);
75 public:
76 /// Perform copying during cloning
77 virtual Actor* copy(Space& home);
78 /// Const function (defined as low unary)
79 virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
80 /// Schedule function
81 virtual void reschedule(Space& home);
82 /// Perform propagation
83 virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
84 /// Post propagator for path \a p
85 template<class Path>
86 static ExecStatus post(Space& home, const Path& p);
87 /// Delete propagator and return its size
88 virtual size_t dispose(Space& home);
89 };
90
91}}
92
93#include <gecode/search/nogoods.hpp>
94
95#endif
96
97// STATISTICS: search-other