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not-first-not-last.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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6  * Copyright:
7  * Christian Schulte, 2009
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10  * $Date: 2014-02-20 17:00:07 +0100 (Thu, 20 Feb 2014) $ by $Author: schulte $
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37 
38 #include <algorithm>
39 
40 namespace Gecode { namespace Int { namespace Unary {
41 
42  template<class ManTaskView>
45  sort<ManTaskView,STO_LCT,true>(t);
46 
47  Region r(home);
48 
51  int* lct = r.alloc<int>(t.size());
52 
53  for (int i=t.size(); i--; )
54  lct[i] = t[i].lct();
55 
56  for (int i=0; i<t.size(); i++) {
57  int j = -1;
58  while (q() && (t[i].lct() > t[q.task()].lst())) {
59  if ((j >= 0) && (o.ect() > t[q.task()].lst()))
60  lct[q.task()] = std::min(lct[q.task()],t[j].lst());
61  j = q.task();
62  o.insert(j); ++q;
63  }
64  if ((j >= 0) && (o.ect(i) > t[i].lst()))
65  lct[i] = std::min(lct[i],t[j].lst());
66  }
67 
68  for (int i=t.size(); i--; )
69  GECODE_ME_CHECK(t[i].lct(home,lct[i]));
70 
71  return ES_OK;
72  }
73 
74  template<class ManTask>
78  GECODE_ES_CHECK(notlast(home,f));
80  return notlast(home,b);
81  }
82 
83  template<class OptTaskView>
86  sort<OptTaskView,STO_LCT,true>(t);
87 
88  Region r(home);
89 
92  int* lct = r.alloc<int>(t.size());
93 
94  for (int i=t.size(); i--; )
95  lct[i] = t[i].lct();
96 
97  for (int i=0; i<t.size(); i++) {
98  int j = -1;
99  while (q() && (t[i].lct() > t[q.task()].lst())) {
100  if ((j >= 0) && (o.ect() > t[q.task()].lst()))
101  lct[q.task()] = std::min(lct[q.task()],t[j].lst());
102  j = q.task();
103  o.insert(j); ++q;
104  }
105  if ((j >= 0) && (o.ect(i) > t[i].lst()))
106  lct[i] = std::min(lct[i],t[j].lst());
107  }
108 
109  {
110  int n = t.size();
111  for (int i=n; i--; )
112  if (t[i].mandatory()) {
113  GECODE_ME_CHECK(t[i].lct(home,lct[i]));
114  } else if (lct[i] < t[i].ect()) {
115  GECODE_ME_CHECK(t[i].excluded(home));
116  t[i].cancel(home,p,PC_INT_BND); t[i]=t[--n];
117  }
118  t.size(n);
119  }
120 
121  return (t.size() < 2) ? home.ES_SUBSUMED(p) : ES_OK;
122  }
123 
124  template<class OptTask>
125  ExecStatus
128  GECODE_ES_CHECK(notlast(home,p,f));
130  return notlast(home,p,b);
131  }
132 
133 }}}
134 
135 // STATISTICS: int-prop
NodeType t
Type of node.
Definition: bool-expr.cpp:234
Task view array.
Definition: task.hh:233
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
Base-class for propagators.
Definition: core.hpp:755
Handle to region.
Definition: region.hpp:61
ExecStatus notfirstnotlast(Space &home, TaskArray< ManTask > &t)
Propagate not-first and not-last.
Computation spaces.
Definition: core.hpp:1362
void insert(int i)
Insert task with index i.
Definition: tree.hpp:68
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Omega trees for computing ect of task sets.
Definition: unary.hh:674
const FloatNum min
Smallest allowed float value.
Definition: float.hh:833
Gecode::IntArgs i(4, 1, 2, 3, 4)
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:91
ExecStatus notlast(Space &home, TaskViewArray< ManTaskView > &t)
Allows to iterate over task views according to a specified order.
Definition: task.hh:309
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:139
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
int task(void) const
Return current task position.
Definition: iter.hpp:72
ExecStatus
Definition: core.hpp:523
int ect(void) const
Return earliest completion time of all tasks.
Definition: tree.hpp:83
#define forceinline
Definition: config.hpp:132
Allows to iterate over mandatory task views according to a specified order.
Definition: task.hh:339
Execution is okay.
Definition: core.hpp:527
struct Gecode::@518::NNF::@57::@58 b
For binary nodes (and, or, eqv)
Gecode toplevel namespace