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dekker.one
1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christopher Mears <Chris.Mears@monash.edu>
5 *
6 * Contributing authors:
7 * Christian Schulte <schulte@gecode.org>
8 *
9 * Copyright:
10 * Christopher Mears, 2011
11 * Christian Schulte, 2011
12 *
13 * This file is part of Gecode, the generic constraint
14 * development environment:
15 * http://www.gecode.org
16 *
17 * Permission is hereby granted, free of charge, to any person obtaining
18 * a copy of this software and associated documentation files (the
19 * "Software"), to deal in the Software without restriction, including
20 * without limitation the rights to use, copy, modify, merge, publish,
21 * distribute, sublicense, and/or sell copies of the Software, and to
22 * permit persons to whom the Software is furnished to do so, subject to
23 * the following conditions:
24 *
25 * The above copyright notice and this permission notice shall be
26 * included in all copies or substantial portions of the Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35 *
36 */
37
38#ifndef GECODE_INT_PRECEDE_HH
39#define GECODE_INT_PRECEDE_HH
40
41#include <gecode/int.hh>
42
43/**
44 * \namespace Gecode::Int::Precede
45 * \brief Value precedence propagators
46 */
47
48namespace Gecode { namespace Int { namespace Precede {
49
50 /**
51 * \brief Single value precedence propagator
52 *
53 * The propagator is based on: Yat Chiu Law and Jimmy H.M. Lee,
54 * Global Constraints for Integer and Set Value Precedence,
55 * CP 2004, 362--376.
56 *
57 * Requires \code #include <gecode/int/precede.hh> \endcode
58 * \ingroup FuncIntProp
59 */
60 template<class View>
61 class Single : public NaryPropagator<View,PC_INT_NONE> {
62 protected:
63 using NaryPropagator<View,PC_INT_NONE>::x;
64 /// %Advisors for views (by position in array)
65 class Index : public Advisor {
66 public:
67 /// The position of the view in the view array
68 int i;
69 /// Create index advisor
70 Index(Space& home, Propagator& p, Council<Index>& c, int i);
71 /// Clone index advisor \a a
72 Index(Space& home, Index& a);
73 };
74 /// The advisor council
75 Council<Index> c;
76 /// The value \a s must precede \a t
77 int s, t;
78 /// Pointers updated during propagation
79 int alpha, beta, gamma;
80 /// Update the alpha pointer
81 ExecStatus updateAlpha(Space& home);
82 /// Update the beta pointer
83 ExecStatus updateBeta(Space& home);
84 /// Constructor for posting
85 Single(Home home, ViewArray<View>& x, int s, int t, int beta, int gamma);
86 /// Constructor for cloning \a p
87 Single(Space& home, Single<View>& p);
88 public:
89 /// Copy propagator during cloning
90 virtual Propagator* copy(Space& home);
91 /// Cost function
92 virtual PropCost cost(const Space&, const ModEventDelta&) const;
93 /// Schedule function
94 virtual void reschedule(Space& home);
95 /// Delete propagator and return its size
96 virtual size_t dispose(Space& home);
97 /// Give advice to propagator
98 virtual ExecStatus advise(Space& home, Advisor& a, const Delta& d);
99 /// Perform propagation
100 virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
101 /// Post propagator that \a s precedes \a t in \a x
102 static ExecStatus post(Home home, ViewArray<View>& x, int s, int t);
103 };
104
105}}}
106
107#include <gecode/int/precede/single.hpp>
108
109#endif
110
111// STATISTICS: int-prop