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pair.cpp
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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, 2009
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9  * Last modified:
10  * $Date: 2010-07-15 01:46:18 +1000 (Thu, 15 Jul 2010) $ by $Author: schulte $
11  * $Revision: 11192 $
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37 
38 #include <gecode/int/element.hh>
39 
40 namespace Gecode { namespace Int { namespace Element {
41 
42  Actor*
43  Pair::copy(Space& home, bool share) {
44  return new (home) Pair(home,share,*this);
45  }
46 
48  class PairValues {
49  private:
51  IntView x;
57  int w;
58  public:
60 
61 
62  PairValues(IntView x, IntView y, int w);
64 
66 
67 
68  bool operator ()(void) const;
70  void operator ++(void);
72 
74 
75 
76  int val(void) const;
78  };
79 
82  : x(x0), xv(x0), yv(y0), w(w0) {}
83  forceinline void
85  ++xv;
86  if (!xv()) {
87  xv.init(x); ++yv;
88  }
89  }
90  forceinline bool
92  return yv();
93  }
94  forceinline int
95  PairValues::val(void) const {
96  return xv.val()+w*yv.val();
97  }
98 
99 
100  ExecStatus
102  Region r(home);
103 
104  if (x0.assigned()) {
105  // Bitset for supported div and mod values
106  Support::BitSet<Region> d(r,static_cast<unsigned int>((x2.max() / w)+1));
107  for (ViewValues<IntView> i(x2); i(); ++i) {
108  d.set(static_cast<unsigned int>(i.val() / w));
109  }
111  GECODE_ME_CHECK(x1.inter_v(home,id,false));
112  } else {
113  // Bitset for supported div and mod values
115  d(r,static_cast<unsigned int>((x2.max() / w)+1)),
116  m(r,static_cast<unsigned int>(w));
117  for (ViewValues<IntView> i(x2); i(); ++i) {
118  d.set(static_cast<unsigned int>(i.val() / w));
119  m.set(static_cast<unsigned int>(i.val() % w));
120  }
122  GECODE_ME_CHECK(x0.inter_v(home,im,false));
124  GECODE_ME_CHECK(x1.inter_v(home,id,false));
125  }
126 
127  if (x0.assigned() && x1.assigned()) {
128  GECODE_ME_CHECK(x2.eq(home,x0.val()+w*x1.val()));
129  return home.ES_SUBSUMED(*this);
130  } else if (x1.assigned()) {
131  OffsetView x0x1w(x0,x1.val()*w);
133  ::post(home(*this),x0x1w,x2)));
134  }
135 
136  PairValues xy(x0,x1,w);
137  GECODE_ME_CHECK(x2.inter_v(home,xy,false));
138 
139  if (x2.assigned()) {
140  GECODE_ME_CHECK(x0.eq(home,x2.val() % w));
141  GECODE_ME_CHECK(x1.eq(home,static_cast<int>(x2.val() / w)));
142  return home.ES_SUBSUMED(*this);
143  }
144 
145  return ES_NOFIX;
146  }
147 
148 }}}
149 
150 // STATISTICS: int-prop
151