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view-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, 2003
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9  * Last modified:
10  * $Date: 2011-08-29 22:59:24 +1000 (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, class VZ, bool shr>
43  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>
49  VY y, VZ z, int c) {
50  GECODE_ME_CHECK(z.gq(home,-c));
51  if (z.assigned())
52  return LqInt<VX,VY>::post(home,x,y,z.val()+c);
53  if (sharing(x,y,z))
54  (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
55  else
56  (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
57  return ES_OK;
58  }
59 
60  template<class VX, class VY, class VZ, bool shr>
64  : ViewBase<VX,VY,VZ>(home,share,p) {}
65 
66  template<class VX, class VY, class VZ, bool shr>
67  Actor*
68  LqView<VX,VY,VZ,shr>::copy(Space& home, bool share) {
69  return new (home) LqView<VX,VY,VZ,shr>(home,share,*this);
70  }
71 
72  template<class VX, class VY, class VZ, bool shr>
75  count(home);
76  GECODE_ME_CHECK(z.gq(home,atleast()));
77 
78  if (z.max() == atleast()) {
79  GECODE_ES_CHECK(post_false(home,x,y));
80  return home.ES_SUBSUMED(*this);
81  }
82 
83  if (x.size() == 0)
84  return home.ES_SUBSUMED(*this);
85 
86  if (z.assigned()) {
87  VY yc(y);
88  GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
89  }
90 
91  return shr ? ES_NOFIX : ES_FIX;
92  }
93 
94 }}}
95 
96 // STATISTICS: int-prop