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pair.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
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7  * Christian Schulte, 2009
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33 
34 #include <gecode/int/element.hh>
35 
36 namespace Gecode { namespace Int { namespace Element {
37 
38  Actor*
39  Pair::copy(Space& home) {
40  return new (home) Pair(home,*this);
41  }
42 
44  class PairValues {
45  private:
47  IntView x;
53  int w;
54  public:
56 
57  PairValues(IntView x, IntView y, int w);
60 
62 
63  bool operator ()(void) const;
66  void operator ++(void);
68 
70 
71  int val(void) const;
74  };
75 
78  : x(x0), xv(x0), yv(y0), w(w0) {}
79  forceinline void
81  ++xv;
82  if (!xv()) {
83  xv.init(x); ++yv;
84  }
85  }
86  forceinline bool
88  return yv();
89  }
90  forceinline int
91  PairValues::val(void) const {
92  return xv.val()+w*yv.val();
93  }
94 
95 
98  Region r;
99 
100  if (x0.assigned()) {
101  // Bitset for supported div and mod values
102  Support::BitSet<Region> d(r,static_cast<unsigned int>((x2.max() / w)+1));
103  for (ViewValues<IntView> i(x2); i(); ++i) {
104  d.set(static_cast<unsigned int>(i.val() / w));
105  }
107  GECODE_ME_CHECK(x1.inter_v(home,id,false));
108  } else {
109  // Bitset for supported div and mod values
111  d(r,static_cast<unsigned int>((x2.max() / w)+1)),
112  m(r,static_cast<unsigned int>(w));
113  for (ViewValues<IntView> i(x2); i(); ++i) {
114  d.set(static_cast<unsigned int>(i.val() / w));
115  m.set(static_cast<unsigned int>(i.val() % w));
116  }
118  GECODE_ME_CHECK(x0.inter_v(home,im,false));
120  GECODE_ME_CHECK(x1.inter_v(home,id,false));
121  }
122 
123  if (x0.assigned() && x1.assigned()) {
124  GECODE_ME_CHECK(x2.eq(home,x0.val()+w*x1.val()));
125  return home.ES_SUBSUMED(*this);
126  } else if (x1.assigned()) {
127  OffsetView x0x1w(x0,x1.val()*w);
129  ::post(home(*this),x0x1w,x2)));
130  }
131 
132  PairValues xy(x0,x1,w);
133  GECODE_ME_CHECK(x2.inter_v(home,xy,false));
134 
135  if (x2.assigned()) {
136  GECODE_ME_CHECK(x0.eq(home,x2.val() % w));
137  GECODE_ME_CHECK(x1.eq(home,static_cast<int>(x2.val() / w)));
138  return home.ES_SUBSUMED(*this);
139  }
140 
141  return ES_NOFIX;
142  }
143 
144 }}}
145 
146 // STATISTICS: int-prop
147 
void operator++(void)
Move iterator to next value (if possible)
Definition: pair.cpp:80
Post propagator for SetVar x
Definition: set.hh:767
PairValues(IntView x, IntView y, int w)
Initialize with views x and y and width w.
Definition: pair.cpp:77
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:767
void set(unsigned int i)
Set bit i.
Value iterator for values in a bitset.
unsigned int id(void) const
Return propagator id.
Definition: core.hpp:3542
bool assigned(void) const
Test whether view is assigned.
Definition: view.hpp:516
IntView x1
Definition: pattern.hpp:116
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
int min(void) const
Return minimum of domain.
Definition: int.hpp:58
int val(void) const
Return current value.
Definition: pair.cpp:91
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: pair.cpp:39
void init(const View &x)
Initialize with values x.
Definition: iter.hpp:53
Computation spaces.
Definition: core.hpp:1742
int w
Width.
Definition: element.hh:304
bool operator()(void) const
Test whether iterator is still at a value or done.
Definition: pair.cpp:87
int val(void) const
Return current value.
static ExecStatus post(Home home, IntView x0, IntView x1, IntView x2, int w, int h)
Post propagator .
Definition: pair.hpp:43
IntView x2
Definition: pattern.hpp:116
Gecode toplevel namespace
int max(void) const
Return maximum of domain.
Definition: int.hpp:62
Binary domain consistent equality propagator.
Definition: rel.hh:68
Pair(Space &home, Pair &p)
Constructor for cloning p.
Definition: pair.hpp:64
int val(void) const
Return assigned value (only if assigned)
Definition: int.hpp:70
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
Handle to region.
Definition: region.hpp:55
ModEvent inter_v(Space &home, I &i, bool depends=true)
Intersect domain with values described by i.
Definition: int.hpp:201
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:767
IntView x0
Three views.
Definition: pattern.hpp:116
Offset integer view.
Definition: view.hpp:443
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: pair.cpp:97
Gecode::IntSet d(v, 7)
Integer view for integer variables.
Definition: view.hpp:129
#define forceinline
Definition: config.hpp:192
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
@ ES_NOFIX
Propagation has not computed fixpoint.
Definition: core.hpp:475
Gecode::IntArgs i({1, 2, 3, 4})
#define GECODE_REWRITE(prop, post)
Rewrite propagator by executing post function.
Definition: macros.hpp:116
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: int.hpp:166
ExecStatus
Definition: core.hpp:472
Value iterator for pair of iterators.
Definition: pair.cpp:44