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int-lq.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, 2006
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9  * Last modified:
10  * $Date: 2011-08-29 14:59:24 +0200 (Mon, 29 Aug 2011) $ by $Author: schulte $
11  * $Revision: 12359 $
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37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY>
42  LqInt<VX,VY>::LqInt(Home home, ViewArray<VX>& x, int n_s, VY y, int c)
43  : IntBase<VX,VY>(home,x,n_s,y,c) {}
44 
45  template<class VX, class VY>
47  LqInt<VX,VY>::post(Home home, ViewArray<VX>& x, VY y, int c) {
48  // Eliminate decided views
49  int n_x = x.size();
50  for (int i=n_x; i--; )
51  switch (holds(x[i],y)) {
52  case RT_FALSE:
53  x[i] = x[--n_x]; break;
54  case RT_TRUE:
55  x[i] = x[--n_x]; c--; break;
56  case RT_MAYBE:
57  break;
58  default:
60  }
61  x.size(n_x);
62  if (c < 0)
63  return ES_FAILED;
64  if (c >= n_x)
65  return ES_OK;
66  // All views must be different
67  if (c == 0)
68  return post_false(home,x,y);
69  (void) new (home) LqInt<VX,VY>(home,x,n_x-c+1,y,c);
70  return ES_OK;
71  }
72 
73  template<class VX, class VY>
75  LqInt<VX,VY>::LqInt(Space& home, bool share, LqInt<VX,VY>& p)
76  : IntBase<VX,VY>(home,share,p) {}
77 
78  template<class VX, class VY>
79  Actor*
80  LqInt<VX,VY>::copy(Space& home, bool share) {
81  return new (home) LqInt<VX,VY>(home,share,*this);
82  }
83 
84  template<class VX, class VY>
87  // Eliminate decided views from subscribed views
88  int n_x = x.size();
89  for (int i=n_s; i--; )
90  switch (holds(x[i],y)) {
91  case RT_FALSE:
92  x[i].cancel(home,*this,PC_INT_DOM);
93  x[i]=x[--n_s]; x[n_s]=x[--n_x];
94  break;
95  case RT_TRUE:
96  x[i].cancel(home,*this,PC_INT_DOM);
97  x[i]=x[--n_s]; x[n_s]=x[--n_x]; c--;
98  break;
99  case RT_MAYBE:
100  break;
101  default:
102  GECODE_NEVER;
103  }
104  x.size(n_x);
105  if (c < 0)
106  return ES_FAILED;
107  if (c >= n_x)
108  return home.ES_SUBSUMED(*this);
109  // Eliminate decided views from unsubscribed views
110  for (int i=n_x; i-- > n_s; )
111  switch (holds(x[i],y)) {
112  case RT_FALSE: x[i]=x[--n_x]; break;
113  case RT_TRUE: x[i]=x[--n_x]; c--; break;
114  case RT_MAYBE: break;
115  default: GECODE_NEVER;
116  }
117  x.size(n_x);
118  if (c < 0)
119  return ES_FAILED;
120  if (c >= n_x)
121  return home.ES_SUBSUMED(*this);
122  if (c == 0) {
123  // All views must be different
124  GECODE_ES_CHECK(post_false(home,x,y));
125  return home.ES_SUBSUMED(*this);
126  }
127  // Now, there must be new subscriptions from x[n_s] up to x[n_x-c+1]
128  int m = n_x-c;
129  while (n_s <= m)
130  x[n_s++].subscribe(home,*this,PC_INT_DOM,false);
131  return ES_FIX;
132  }
133 
134 }}}
135 
136 // STATISTICS: int-prop