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view-eq.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, 2003
8  *
9  * Last modified:
10  * $Date: 2011-09-20 21:58:39 +1000 (Tue, 20 Sep 2011) $ by $Author: schulte $
11  * $Revision: 12404 $
12  *
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37 
38 namespace Gecode { namespace Int { namespace Count {
39 
40  template<class VX, class VY, class VZ, bool shr, bool dom>
43  ViewArray<VX>& x, VY y, VZ z, int c)
44  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
45 
46  template<class VX, class VY, class VZ, bool shr, bool dom>
49  ViewArray<VX>& x, VY y, VZ z, int c) {
50  GECODE_ME_CHECK(z.gq(home,-c));
51  GECODE_ME_CHECK(z.lq(home,x.size()-c));
52  if ((vtd(y) != VTD_VARVIEW) && z.assigned())
53  return EqInt<VX,VY>::post(home,x,y,z.val()+c);
54  if (sharing(x,y,z))
55  (void) new (home) EqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
56  else
57  (void) new (home) EqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
58  return ES_OK;
59  }
60 
61  template<class VX, class VY, class VZ, bool shr, bool dom>
65  : ViewBase<VX,VY,VZ>(home,share,p) {}
66 
67  template<class VX, class VY, class VZ, bool shr, bool dom>
68  Actor*
70  return new (home) EqView<VX,VY,VZ,shr,dom>(home,share,*this);
71  }
72 
73  template<class VX, class VY, class VZ, bool shr, bool dom>
76  count(home);
77 
78  GECODE_ME_CHECK(z.gq(home,atleast()));
79  GECODE_ME_CHECK(z.lq(home,atmost()));
80 
81  if (z.assigned()) {
82  if (z.val() == atleast()) {
83  GECODE_ES_CHECK(post_false(home,x,y));
84  return home.ES_SUBSUMED(*this);
85  }
86  if (z.val() == atmost()) {
87  GECODE_ES_CHECK(post_true(home,x,y));
88  return home.ES_SUBSUMED(*this);
89  }
90  if (!dom || (vtd(y) != VTD_VARVIEW)) {
91  VY yc(y);
93  ::post(home(*this),x,yc,z.val()+c)));
94  }
95  }
96 
97 
98  if (dom && (vtd(y) == VTD_VARVIEW) && (z.min() > 0)) {
99  /*
100  * Only if the propagator is at fixpoint here, continue
101  * when things are shared: the reason is that prune
102  * requires that the views in x overlap with y!
103  */
104  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
105  return ES_NOFIX;
106 
107  GECODE_ES_CHECK(prune(home,x,y));
108 
109  return ES_NOFIX;
110  }
111 
112  return shr ? ES_NOFIX : ES_FIX;
113  }
114 
115 }}}
116 
117 // STATISTICS: int-prop