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opt-prop.hpp
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2009
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10  * $Date: 2011-05-25 16:56:41 +0200 (Wed, 25 May 2011) $ by $Author: schulte $
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37 
38 #include <algorithm>
39 
40 namespace Gecode { namespace Int { namespace Unary {
41 
42  template<class OptTask>
45  : TaskProp<OptTask,Int::PC_INT_BND>(home,t) {}
46 
47  template<class OptTask>
50  : TaskProp<OptTask,Int::PC_INT_BND>(home,shared,p) {}
51 
52  template<class OptTask>
55  int m=0, o=0;
56  for (int i=t.size(); i--; ) {
57  if (t[i].mandatory())
58  m++;
59  else if (t[i].optional())
60  o++;
61  }
62  if (m == t.size()) {
64  for (int i=m; i--; )
65  mt[i].init(t[i]);
67  }
68  if (o+m > 1)
69  (void) new (home) OptProp<OptTask>(home,t);
70  return ES_OK;
71  }
72 
73  template<class OptTask>
74  Actor*
75  OptProp<OptTask>::copy(Space& home, bool share) {
76  return new (home) OptProp<OptTask>(home,share,*this);
77  }
78 
79  template<class OptTask>
80  ExecStatus
82  // Did one of the Boolean views change?
84  GECODE_ES_CHECK((purge<OptTask,Int::PC_INT_BND>(home,*this,t)));
85 
86  GECODE_ES_CHECK(overload(home,*this,t));
87 
88  GECODE_ES_CHECK(detectable(home,*this,t));
89  GECODE_ES_CHECK(notfirstnotlast(home,*this,t));
90 
91  // Partition into mandatory and optional activities
92  int n = t.size();
93  int i=0, j=n-1;
94  while (true) {
95  while ((i < n) && t[i].mandatory()) i++;
96  while ((j >= 0) && !t[j].mandatory()) j--;
97  if (i >= j) break;
98  std::swap(t[i],t[j]);
99  }
100 
101  if (i > 1) {
102  // Truncate array to only contain mandatory tasks
103  t.size(i);
105  // Restore to also include optional tasks
106  t.size(n);
107  }
108 
109  GECODE_ES_CHECK(subsumed(home,*this,t));
110 
111  return ES_NOFIX;
112  }
113 
114 }}}
115 
116 // STATISTICS: int-prop
NodeType t
Type of node.
Definition: bool-expr.cpp:234
void post(Home home, Term *t, int n, FloatRelType frt, FloatVal c)
Post propagator for linear constraint over floats.
Definition: post.cpp:228
Scheduling propagator for unary resource with mandatory tasks
Definition: unary.hh:787
Propagator for tasks
Definition: task.hh:424
ExecStatus notfirstnotlast(Space &home, TaskArray< ManTask > &t)
Propagate not-first and not-last.
Computation spaces.
Definition: core.hpp:1362
Base-class for both propagators and branchers.
Definition: core.hpp:666
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:84
virtual Actor * copy(Space &home, bool share)
Perform copying during cloning.
Definition: opt-prop.hpp:75
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Gecode::IntArgs i(4, 1, 2, 3, 4)
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
const Gecode::PropCond PC_INT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:91
ExecStatus overload(Space &home, TaskArray< ManTask > &t)
Check mandatory tasks t for overload.
Definition: overload.hpp:43
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: opt-prop.hpp:81
ExecStatus detectable(Space &home, TaskViewArray< ManTaskView > &t)
Definition: detectable.hpp:42
OptProp(Home home, TaskArray< OptTask > &t)
Constructor for creation.
Definition: opt-prop.hpp:44
ExecStatus subsumed(Space &home, Propagator &p, TaskArray< Task > &t)
Check tasks t for subsumption.
Definition: subsumption.hpp:42
Scheduling propagator for unary resource with optional tasks
Definition: unary.hh:810
ExecStatus
Definition: core.hpp:523
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
static ExecStatus post(Home home, TaskArray< OptTask > &t)
Post propagator that schedules tasks on unary resource.
Definition: opt-prop.hpp:54
#define forceinline
Definition: config.hpp:132
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:67
Execution is okay.
Definition: core.hpp:527
ExecStatus edgefinding(Space &home, TaskViewArray< TaskView > &t)
Propagation has not computed fixpoint.
Definition: core.hpp:526
bool shared(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:662
Gecode toplevel namespace
bool optional(const BoolVarArgs &m)
Definition: no-overlap.cpp:45
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
const Gecode::ModEvent ME_BOOL_VAL
Domain operation has resulted in a value (assigned variable)
Definition: var-type.hpp:116