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man.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2011
8  *
9  * Last modified:
10  * $Date: 2012-09-10 19:36:08 +0200 (Mon, 10 Sep 2012) $ by $Author: schulte $
11  * $Revision: 13072 $
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37 
38 namespace Gecode { namespace Int { namespace NoOverlap {
39 
40  template<class Box>
42  ManProp<Box>::ManProp(Home home, Box* b, int n)
43  : Base<Box>(home, b, n) {}
44 
45  template<class Box>
46  inline ExecStatus
47  ManProp<Box>::post(Home home, Box* b, int n) {
48  if (n > 1)
49  (void) new (home) ManProp<Box>(home,b,n);
50  return ES_OK;
51  }
52 
53  template<class Box>
54  forceinline size_t
56  (void) Base<Box>::dispose(home);
57  return sizeof(*this);
58  }
59 
60 
61  template<class Box>
64  : Base<Box>(home, shared, p, p.n) {}
65 
66  template<class Box>
67  Actor*
68  ManProp<Box>::copy(Space& home, bool share) {
69  return new (home) ManProp<Box>(home,share,*this);
70  }
71 
72  template<class Box>
73  ExecStatus
75  Region r(home);
76 
77  // Number of disjoint boxes
78  int* db = r.alloc<int>(n);
79  for (int i=n; i--; )
80  db[i] = n-1;
81 
82  // Number of boxes to be eliminated
83  int e = 0;
84 
85  for (int i=n; i--; )
86  for (int j=i; j--; )
87  if (b[i].nooverlap(b[j])) {
88  assert(db[i] > 0); assert(db[j] > 0);
89  if (--db[i] == 0) e++;
90  if (--db[j] == 0) e++;
91  continue;
92  } else {
93  GECODE_ES_CHECK(b[i].nooverlap(home,b[j]));
94  }
95 
96  if (e == n)
97  return home.ES_SUBSUMED(*this);
98 
99  {
100  int i = n-1;
101  while (e > 0) {
102  // Eliminate boxes that do not overlap
103  while (db[i] > 0)
104  i--;
105  b[i].cancel(home, *this);
106  b[i] = b[--n];
107  e--; i--;
108  }
109  if (n < 2)
110  return home.ES_SUBSUMED(*this);
111  }
112 
113  return ES_NOFIX;
114  }
115 
116 }}}
117 
118 // STATISTICS: int-prop
119 
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
T * alloc(long unsigned int n)
Allocate block of n objects of type T from region.
Definition: region.hpp:326
static ExecStatus post(Home home, Box *b, int n)
Post propagator for boxes b.
Definition: man.hpp:47
Handle to region.
Definition: region.hpp:61
No-overlap propagator for mandatory boxes.
Definition: no-overlap.hh:261
Computation spaces.
Definition: core.hpp:1362
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: man.hpp:74
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
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
NNF * r
Right subtree.
Definition: bool-expr.cpp:246
virtual Actor * copy(Space &home, bool share)
Copy propagator during cloning.
Definition: man.hpp:68
ExecStatus
Definition: core.hpp:523
virtual size_t dispose(Space &home)
Destructor.
Definition: man.hpp:55
#define forceinline
Definition: config.hpp:132
Base class for no-overlap propagator.
Definition: no-overlap.hh:230
Execution is okay.
Definition: core.hpp:527
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
void nooverlap(Home home, const IntVarArgs &x, const IntArgs &w, const IntVarArgs &y, const IntArgs &h, IntConLevel)
Post propagator for rectangle packing.
Definition: no-overlap.cpp:55
struct Gecode::@518::NNF::@57::@58 b
For binary nodes (and, or, eqv)
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
ManProp(Home home, Box *b, int n)
Constructor for posting.
Definition: man.hpp:42