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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: 2011-07-09 00:08:27 +1000 (Sat, 09 Jul 2011) $ by $Author: schulte $
11  * $Revision: 12168 $
12  *
13  * This file is part of Gecode, the generic constraint
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37 
38 namespace Gecode { namespace Int { namespace NoOverlap {
39 
40  template<class Dim, int d>
43  : Base<ManBox<Dim,d> >(home, b, n) {}
44 
45  template<class Dim, int d>
46  inline ExecStatus
48  if (n > 1)
49  (void) new (home) ManProp<Dim,d>(home,b,n);
50  return ES_OK;
51  }
52 
53  template<class Dim, int d>
54  forceinline size_t
56  (void) Base<ManBox<Dim,d> >::dispose(home);
57  return sizeof(*this);
58  }
59 
60 
61  template<class Dim, int d>
64  : Base<ManBox<Dim,d> >(home, shared, p, p.n) {}
65 
66  template<class Dim, int d>
67  Actor*
68  ManProp<Dim,d>::copy(Space& home, bool share) {
69  return new (home) ManProp<Dim,d>(home,share,*this);
70  }
71 
72  template<class Dim, int d>
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