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view-gq.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  *
13  * This file is part of Gecode, the generic constraint
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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  : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
44 
45  template<class VX, class VY, class VZ, bool shr, bool dom>
48  ViewArray<VX>& x, VY y, VZ z, int c) {
49  GECODE_ME_CHECK(z.lq(home,x.size()-c));
50  if ((vtd(y) != VTD_VARVIEW) && z.assigned())
51  return GqInt<VX,VY>::post(home,x,y,z.val()+c);
52  if (sharing(x,y,z))
53  (void) new (home) GqView<VX,VY,VZ,true,dom>(home,x,y,z,c);
54  else
55  (void) new (home) GqView<VX,VY,VZ,false,dom>(home,x,y,z,c);
56  return ES_OK;
57  }
58 
59  template<class VX, class VY, class VZ, bool shr, bool dom>
63  : ViewBase<VX,VY,VZ>(home,share,p) {}
64 
65  template<class VX, class VY, class VZ, bool shr, bool dom>
66  Actor*
68  return new (home) GqView<VX,VY,VZ,shr,dom>(home,share,*this);
69  }
70 
71  template<class VX, class VY, class VZ, bool shr, bool dom>
74  count(home);
75 
76  GECODE_ME_CHECK(z.lq(home,atmost()));
77 
78  if (z.min() == atmost()) {
79  GECODE_ES_CHECK(post_true(home,x,y));
80  return home.ES_SUBSUMED(*this);
81  }
82  if (x.size() == 0)
83  return home.ES_SUBSUMED(*this);
84 
85  if (z.assigned() && (!dom || (vtd(y) != VTD_VARVIEW))) {
86  VY yc(y);
87  GECODE_REWRITE(*this,(GqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
88  }
89 
90  if (dom && (vtd(y) == VTD_VARVIEW) && (z.min() > 0)) {
91  /*
92  * Only if the propagator is at fixpoint here, continue
93  * when things are shared: the reason is that prune
94  * requires that the views in x overlap with y!
95  */
96  if (shr && (VX::me(Propagator::modeventdelta()) != ME_INT_NONE))
97  return ES_NOFIX;
98 
99  GECODE_ES_CHECK(prune(home,x,y));
100 
101  return ES_NOFIX;
102  }
103 
104  return shr ? ES_NOFIX : ES_FIX;
105  }
106 
107 }}}
108 
109 // STATISTICS: int-prop