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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  * Last modified:
16  * $Date: 2012-10-02 15:49:50 +0200 (Tue, 02 Oct 2012) $ by $Author: schulte $
17  * $Revision: 13123 $
18  *
19  * This file is part of Gecode, the generic constraint
20  * development environment:
21  * http://www.gecode.org
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42  */
43 
44 namespace Gecode { namespace Set { namespace Branch {
45 
48  : ValSel<SetView,int>(home,vb) {}
51  : ValSel<SetView,int>(home,shared,vs) {}
52  forceinline int
53  ValSelMin::val(const Space&, SetView x, int) {
55  return u.min();
56  }
57 
60  : ValSel<SetView,int>(home,vb) {}
63  : ValSel<SetView,int>(home,shared,vs) {}
64  forceinline int
65  ValSelMax::val(const Space&, SetView x, int) {
66  int max = 0;
67  for (UnknownRanges<SetView> u(x); u(); ++u)
68  max = u.max();
69  return max;
70  }
71 
74  : ValSel<SetView,int>(home,vb) {}
77  : ValSel<SetView,int>(home,shared,vs) {}
78  forceinline int
79  ValSelMed::val(const Space&, SetView x, int) {
81  unsigned int i = Iter::Ranges::size(u1) / 2;
83  int med = (u2.min()+u2.max()) / 2;
84  ++u2;
85  if (!u2()) {
86  return med;
87  }
89  while (i >= u3.width()) {
90  i -= u3.width();
91  ++u3;
92  }
93  return u3.min() + static_cast<int>(i);
94  }
95 
98  : ValSel<SetView,int>(home,vb), r(vb.rnd()) {}
101  : ValSel<SetView,int>(home,shared,vs) {
102  r.update(home,shared,vs.r);
103  }
104  forceinline int
105  ValSelRnd::val(const Space&, SetView x, int) {
107  unsigned int p = r(Iter::Ranges::size(u));
108  for (UnknownRanges<SetView> i(x); i(); ++i) {
109  if (i.width() > p)
110  return i.min() + static_cast<int>(p);
111  p -= i.width();
112  }
113  GECODE_NEVER;
114  return 0;
115  }
116  forceinline bool
117  ValSelRnd::notice(void) const {
118  return true;
119  }
120  forceinline void
122  r.~Rnd();
123  }
124 
125 }}}
126 
127 // STATISTICS: set-branch
128