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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  * This file is part of Gecode, the generic constraint
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17  * http://www.gecode.org
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39 
40 namespace Gecode { namespace Set { namespace Sequence {
41 
42  inline ExecStatus
43  propagateSeq(Space& home, bool& modified, bool& assigned,
45  int lastElem = x.size()-1;
46  int cur_max = BndSet::MAX_OF_EMPTY;
47  int cur_min = BndSet::MIN_OF_EMPTY;
48 
49  Region r;
51 
52  for (int i=0; i<lastElem; i++) {
53  if (x[i].glbSize() > 0)
54  cur_max = std::max(cur_max, x[i].glbMax());
55  if (x[i].cardMin() > 0)
56  cur_max = std::max(cur_max, x[i].lubMinN(x[i].cardMin()-1));
57  if (cur_max >= Limits::min)
59  x[i+1].exclude(home, Limits::min,
60  cur_max),
61  assigned);
62 
63  if (x[lastElem-i].lubSize() > 0) {
64  cur_min = std::min(cur_min, x[lastElem-i].glbMin());
65  if (x[lastElem-i].cardMin() > 0) {
66  // Compute n-th largest element in x[lastElem-i].lub
67  // for n = x[lastElem-i].cardMin()-1
68  int maxN = BndSet::MAX_OF_EMPTY;
69  int j=0;
70  for (LubRanges<SetView> ubr(x[lastElem-i]); ubr(); ++ubr, ++j) {
71  ub[2*j]=ubr.min(); ub[2*j+1]=ubr.max();
72  }
73  unsigned int xcm = x[lastElem-i].cardMin()-1;
74  while (j--) {
75  unsigned int width = static_cast<unsigned int>(ub[2*j+1]-ub[2*j]+1);
76  if (width > xcm) {
77  maxN = static_cast<int>(ub[2*j+1]-xcm);
78  break;
79  }
80  xcm -= width;
81  }
82  cur_min = std::min(cur_min, maxN);
83  }
84  }
85  if (Limits::max>=cur_min)
87  x[lastElem-i-1].exclude(home, cur_min,
88  Limits::max),
89  assigned);
90  }
91  return ES_NOFIX;
92  }
93 
94 }}}
95 
96 // STATISTICS: set-prop
ExecStatus propagateSeq(Space &home, bool &modified, bool &assigned, ViewArray< SetView > &x)
Definition: common.hpp:43
Post propagator for SetVar x
Definition: set.hh:767
ModEvent exclude(Space &home, View &x, int s)
Prune view x to exclude all values from s.
Definition: set-op.hpp:137
Range iterator for least upper bound of set variable views
Definition: set.hpp:211
const int min
Smallest allowed integer in integer set.
Definition: set.hh:99
bool assigned(View x, int v)
Whether x is assigned to value v.
Definition: single.hpp:43
Array with arbitrary number of elements.
unsigned int cardMin(void) const
Return cardinality minimum.
Definition: set.hpp:78
const FloatNum min
Smallest allowed float value.
Definition: float.hh:846
Computation spaces.
Definition: core.hpp:1742
static const int MIN_OF_EMPTY
Returned by empty sets when asked for their minimum element.
Definition: var-imp.hpp:112
Gecode toplevel namespace
#define GECODE_SET_ME_CHECK_VAL_B(modified, tell, f)
Definition: common.hpp:45
const int max
Largest allowed integer in integer set.
Definition: set.hh:97
static const int MAX_OF_EMPTY
Returned by empty sets when asked for their maximum element.
Definition: var-imp.hpp:110
Handle to region.
Definition: region.hpp:55
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:767
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition: core.hpp:475
Gecode::IntArgs i({1, 2, 3, 4})
const FloatNum max
Largest allowed float value.
Definition: float.hh:844
ExecStatus
Definition: core.hpp:472