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common.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  * Christian Schulte <schulte@gecode.org>
6  *
7  * Contributing authors:
8  * Gabor Szokoli <szokoli@gecode.org>
9  *
10  * Copyright:
11  * Guido Tack, 2004
12  * Christian Schulte, 2004
13  * Gabor Szokoli, 2004
14  *
15  * Last modified:
16  * $Date: 2012-09-07 17:31:22 +0200 (Fri, 07 Sep 2012) $ by $Author: schulte $
17  * $Revision: 13068 $
18  *
19  * This file is part of Gecode, the generic constraint
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43 
44 namespace Gecode { namespace Set { namespace Sequence {
45 
46  inline ExecStatus
47  propagateSeq(Space& home, bool& modified, bool& assigned,
49  int lastElem = x.size()-1;
50  int cur_max = BndSet::MAX_OF_EMPTY;
51  int cur_min = BndSet::MIN_OF_EMPTY;
52 
53  Region r(home);
55 
56  for (int i=0; i<lastElem; i++) {
57  if (x[i].glbSize() > 0)
58  cur_max = std::max(cur_max, x[i].glbMax());
59  if (x[i].cardMin() > 0)
60  cur_max = std::max(cur_max, x[i].lubMinN(x[i].cardMin()-1));
61  if (cur_max >= Limits::min)
63  x[i+1].exclude(home, Limits::min,
64  cur_max),
65  assigned);
66 
67  if (x[lastElem-i].lubSize() > 0) {
68  cur_min = std::min(cur_min, x[lastElem-i].glbMin());
69  if (x[lastElem-i].cardMin() > 0) {
70  // Compute n-th largest element in x[lastElem-i].lub
71  // for n = x[lastElem-i].cardMin()-1
72  int maxN = BndSet::MAX_OF_EMPTY;
73  int j=0;
74  for (LubRanges<SetView> ubr(x[lastElem-i]); ubr(); ++ubr, ++j) {
75  ub[2*j]=ubr.min(); ub[2*j+1]=ubr.max();
76  }
77  unsigned int xcm = x[lastElem-i].cardMin()-1;
78  while (j--) {
79  unsigned int width = static_cast<unsigned int>(ub[2*j+1]-ub[2*j]+1);
80  if (width > xcm) {
81  maxN = static_cast<int>(ub[2*j+1]-xcm);
82  break;
83  }
84  xcm -= width;
85  }
86  cur_min = std::min(cur_min, maxN);
87  }
88  }
89  if (Limits::max>=cur_min)
91  x[lastElem-i-1].exclude(home, cur_min,
92  Limits::max),
93  assigned);
94  }
95  return ES_NOFIX;
96  }
97 
98 }}}
99 
100 // STATISTICS: set-prop
const int min
Smallest allowed integer in integer set.
Definition: set.hh:101
const FloatNum max
Largest allowed float value.
Definition: float.hh:831
Array with arbitrary number of elements.
Handle to region.
Definition: region.hpp:61
static const int MIN_OF_EMPTY
Returned by empty sets when asked for their minimum element.
Definition: var-imp.hpp:116
const int max
Largest allowed integer in integer set.
Definition: set.hh:99
Computation spaces.
Definition: core.hpp:1362
ModEvent exclude(Space &home, View &x, int s)
Prune view x to exclude all values from s.
Definition: set-op.hpp:141
static const int MAX_OF_EMPTY
Returned by empty sets when asked for their maximum element.
Definition: var-imp.hpp:114
const FloatNum min
Smallest allowed float value.
Definition: float.hh:833
Gecode::IntArgs i(4, 1, 2, 3, 4)
Range iterator for least upper bound of set variable views
Definition: set.hpp:205
#define GECODE_SET_ME_CHECK_VAL_B(modified, tell, f)
Definition: common.hpp:49
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
ExecStatus
Definition: core.hpp:523
bool assigned(View x, int v)
Whether x is assigned to value v.
Definition: single.hpp:47
ExecStatus propagateSeq(Space &home, bool &modified, bool &assigned, ViewArray< SetView > &x)
Definition: common.hpp:47
Propagation has not computed fixpoint.
Definition: core.hpp:526
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1215
Gecode toplevel namespace