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opt-prop.hpp
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37 
38 #include <algorithm>
39 
40 namespace Gecode { namespace Int { namespace Unary {
41 
42  template<class OptTask, class PL>
45  : TaskProp<OptTask,PL>(home,t) {}
46 
47  template<class OptTask, class PL>
50  : TaskProp<OptTask,PL>(home,p) {}
51 
52  template<class OptTask, class PL>
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,PL>(home,t);
70  return ES_OK;
71  }
72 
73  template<class OptTask, class PL>
74  Actor*
76  return new (home) OptProp<OptTask,PL>(home,*this);
77  }
78 
79  template<class OptTask, class PL>
82  // Did one of the Boolean views change?
83  if (BoolView::me(med) == ME_BOOL_VAL)
84  GECODE_ES_CHECK((purge<OptTask,PL>(home,*this,t)));
85 
86  GECODE_ES_CHECK((overload<OptTask,PL>(home,*this,t)));
87 
88  if (PL::basic)
89  GECODE_ES_CHECK(timetabling(home,*this,t));
90 
91  if (PL::advanced) {
92  GECODE_ES_CHECK((detectable<OptTask,PL>(home,*this,t)));
93  GECODE_ES_CHECK((notfirstnotlast<OptTask,PL>(home,*this,t)));
94 
95  // Partition into mandatory and optional activities
96  int n = t.size();
97  int i=0, j=n-1;
98  while (true) {
99  while ((i < n) && t[i].mandatory()) i++;
100  while ((j >= 0) && !t[j].mandatory()) j--;
101  if (i >= j) break;
102  std::swap(t[i],t[j]);
103  }
104 
105  if (i > 1) {
106  // Truncate array to only contain mandatory tasks
107  t.size(i);
109  // Restore to also include optional tasks
110  t.size(n);
111  }
112  }
113 
114  if (!PL::basic)
115  GECODE_ES_CHECK(subsumed(home,*this,t));
116 
117  return ES_NOFIX;
118  }
119 
120 }}}
121 
122 // STATISTICS: int-prop
NodeType t
Type of node.
Definition: bool-expr.cpp:234
ExecStatus timetabling(Space &home, Propagator &p, TaskArray< Task > &t)
Perform time-tabling propagation.
Scheduling propagator for unary resource with mandatory tasks
Definition: unary.hh:795
Propagator for tasks
Definition: task.hh:428
#define forceinline
Definition: config.hpp:182
Computation spaces.
Definition: core.hpp:1668
Base-class for both propagators and branchers.
Definition: core.hpp:620
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:95
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
ModEventDelta med
A set of modification events (used during propagation)
Definition: core.hpp:1027
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: opt-prop.hpp:81
ExecStatus subsumed(Space &home, Propagator &p, TaskArray< Task > &t)
Check tasks t for subsumption.
Definition: subsumption.hpp:42
virtual Actor * copy(Space &home)
Perform copying during cloning.
Definition: opt-prop.hpp:75
Scheduling propagator for unary resource with optional tasks
Definition: unary.hh:818
static ExecStatus post(Home home, TaskArray< OptTask > &t)
Post propagator that schedules tasks on unary resource.
Definition: opt-prop.hpp:54
ExecStatus
Definition: core.hpp:464
static ModEvent me(const ModEventDelta &med)
Return modification event for view type in med.
Definition: view.hpp:514
OptProp(Home home, TaskArray< OptTask > &t)
Constructor for creation.
Definition: opt-prop.hpp:44
Execution is okay.
Definition: core.hpp:468
ExecStatus edgefinding(Space &home, TaskViewArray< TaskView > &t)
Propagation has not computed fixpoint.
Definition: core.hpp:467
Gecode toplevel namespace
TaskArray< OptTask > t
Tasks.
Definition: task.hh:431
bool optional(const BoolVarArgs &m)
Definition: no-overlap.cpp:45
int ModEventDelta
Modification event deltas.
Definition: core.hpp:91
Home class for posting propagators
Definition: core.hpp:846
IntRelType swap(IntRelType irt)
Return swapped relation type of irt.
Definition: irt.hpp:41
const Gecode::ModEvent ME_BOOL_VAL
Domain operation has resulted in a value (assigned variable)
Definition: var-type.hpp:116
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:67