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seq.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Guido Tack <tack@gecode.org>
5  * Christian Schulte <schulte@gecode.org>
6  *
7  * Contributing authors:
8  * Gabor Szokoli <szokoli@gecode.org>
9  *
10  * Copyright:
11  * Guido Tack, 2004
12  * Christian Schulte, 2004
13  * Gabor Szokoli, 2004
14  *
15  * This file is part of Gecode, the generic constraint
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39 
40 #include <gecode/set/sequence.hh>
41 
42 namespace Gecode { namespace Set { namespace Sequence {
43 
44  /*
45  * "Sequence" propagator
46  *
47  */
48 
49  Actor*
50  Seq::copy(Space& home) {
51  return new (home) Seq(home,*this);
52  }
53 
56  bool modified = false;
57  bool assigned;
58  do {
59  assigned = false; modified = false;
60  GECODE_ES_CHECK(propagateSeq(home, modified, assigned, x));
61  } while (assigned || modified);
62 
63  for (int i=x.size(); i--;)
64  if (!x[i].assigned())
65  return ES_FIX;
66 
67  return home.ES_SUBSUMED(*this);
68  }
69 
70 }}}
71 
72 // STATISTICS: set-prop
Seq(Space &home, Seq &p)
Constructor for cloning p.
Definition: seq.hpp:52
ExecStatus propagateSeq(Space &home, bool &modified, bool &assigned, ViewArray< SetView > &x)
Definition: common.hpp:43
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3563
bool assigned(View x, int v)
Whether x is assigned to value v.
Definition: single.hpp:43
Computation spaces.
Definition: core.hpp:1742
ViewArray< SetView > x
Array of views.
Definition: pattern.hpp:145
Gecode toplevel namespace
#define GECODE_ES_CHECK(es)
Check whether execution status es is failed or subsumed, and forward failure or subsumption.
Definition: macros.hpp:91
@ ES_FIX
Propagation has computed fixpoint.
Definition: core.hpp:477
int size(void) const
Return size of array (number of elements)
Definition: array.hpp:1156
virtual Actor * copy(Space &home)
Copy propagator during cloning.
Definition: seq.cpp:50
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: seq.cpp:55
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Gecode::IntArgs i({1, 2, 3, 4})
ExecStatus
Definition: core.hpp:472