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val-sel.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Christian Schulte <schulte@gecode.org>
5 *
6 * Contributing authors:
7 * Gabor Szokoli <szokoli@gecode.org>
8 * Guido Tack <tack@gecode.org>
9 *
10 * Copyright:
11 * Christian Schulte, 2012
12 * Gabor Szokoli, 2004
13 * Guido Tack, 2004
14 *
15 * This file is part of Gecode, the generic constraint
16 * development environment:
17 * http://www.gecode.org
18 *
19 * Permission is hereby granted, free of charge, to any person obtaining
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21 * "Software"), to deal in the Software without restriction, including
22 * without limitation the rights to use, copy, modify, merge, publish,
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24 * permit persons to whom the Software is furnished to do so, subject to
25 * the following conditions:
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27 * The above copyright notice and this permission notice shall be
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29 *
30 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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39
40namespace Gecode { namespace Set { namespace Branch {
41
44 : ValSel<SetView,int>(home,vb) {}
47 : ValSel<SetView,int>(home,vs) {}
48 forceinline int
49 ValSelMin::val(const Space&, SetView x, int) {
51 return u.min();
52 }
53
56 : ValSel<SetView,int>(home,vb) {}
59 : ValSel<SetView,int>(home,vs) {}
60 forceinline int
61 ValSelMax::val(const Space&, SetView x, int) {
62 int max = 0;
63 for (UnknownRanges<SetView> u(x); u(); ++u)
64 max = u.max();
65 return max;
66 }
67
70 : ValSel<SetView,int>(home,vb) {}
73 : ValSel<SetView,int>(home,vs) {}
74 forceinline int
75 ValSelMed::val(const Space&, SetView x, int) {
77 unsigned int i = Iter::Ranges::size(u1) / 2;
79 int med = (u2.min()+u2.max()) / 2;
80 ++u2;
81 if (!u2()) {
82 return med;
83 }
85 while (i >= u3.width()) {
86 i -= u3.width();
87 ++u3;
88 }
89 return u3.min() + static_cast<int>(i);
90 }
91
94 : ValSel<SetView,int>(home,vb), r(vb.rnd()) {}
97 : ValSel<SetView,int>(home,vs), r(vs.r) {
98 }
99 forceinline int
102 unsigned int p = r(Iter::Ranges::size(u));
103 for (UnknownRanges<SetView> i(x); i(); ++i) {
104 if (i.width() > p)
105 return i.min() + static_cast<int>(p);
106 p -= i.width();
107 }
109 return 0;
110 }
111 forceinline bool
112 ValSelRnd::notice(void) const {
113 return true;
114 }
115 forceinline void
117 r.~Rnd();
118 }
119
120}}}
121
122// STATISTICS: set-branch
123
union Gecode::@603::NNF::@65 u
Union depending on nodetype t.
int p
Number of positive literals for node type.
int val(const Space &home, View x, int i)
Return value of view x at position i.
Definition val-sel.hpp:62
ValSelMax(Space &home, const ValBranch< Var > &vb)
Constructor for initialization.
ValSelMed(Space &home, const ValBranch< Var > &vb)
Constructor for initialization.
int val(const Space &home, View x, int i)
Return value of view x at position i.
Definition val-sel.hpp:77
ValSelMin(Space &home, const ValBranch< Var > &vb)
Constructor for initialization.
int val(const Space &home, View x, int i)
Return value of view x at position i.
Definition val-sel.hpp:47
int val(const Space &home, View x, int i)
Return value of view x at position i.
Definition val-sel.hpp:108
bool notice(void) const
Whether dispose must always be called (that is, notice is needed)
Definition val-sel.hpp:120
ValSelRnd(Space &home, const ValBranch< Var > &vb)
Constructor for initialization.
void dispose(Space &home)
Delete value selection.
Definition val-sel.hpp:125
int min(void) const
Return smallest value of range.
unsigned int width(void) const
Return width of range (distance between minimum and maximum)
int max(void) const
Return largest value of range.
~Rnd(void)
Destructor.
Definition rnd.cpp:68
Value selection class for maximum of view.
Definition branch.hh:245
Value selection class for median of view.
Definition branch.hh:261
Value selection class for mimimum of view.
Definition branch.hh:229
Value selection class for random value of view.
Definition branch.hh:277
Rnd r
The used random number generator.
Definition branch.hh:280
Set view for set variables
Definition view.hpp:56
Range iterator for the unknown set.
Definition var-imp.hpp:402
Computation spaces.
Definition core.hpp:1742
Value branching information.
Definition val.hpp:41
Base class for value selection.
Definition val-sel.hpp:44
unsigned int size(I &i)
Size of all ranges of range iterator i.
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:767
void max(Home home, FloatVar x0, FloatVar x1, FloatVar x2)
Post propagator for .
Post propagator for SetVar x
Definition set.hh:767
#define forceinline
Definition config.hpp:187
#define GECODE_NEVER
Assert that this command is never executed.
Definition macros.hpp:56