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abs.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  * Guido Tack <tack@gecode.org>
6  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
7  *
8  * Copyright:
9  * Christian Schulte, 2004
10  * Guido Tack, 2006
11  * Vincent Barichard, 2012
12  *
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37 
38 namespace Gecode { namespace Float { namespace Arithmetic {
39 
40  template<class A, class B>
42  Abs<A,B>::Abs(Home home, A x0, B x1)
43  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
44 
45  template<class A, class B>
47  Abs<A,B>::post(Home home, A x0, B x1) {
48  GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
49  if (x0.min() >= 0)
50  GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
51  else if (x0.max() <= 0)
52  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
53  else
54  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
55  (void) new (home) Abs<A,B>(home,x0,x1);
56  return ES_OK;
57  }
58 
59  template<class A, class B>
63 
64  template<class A, class B>
65  Actor*
67  return new (home) Abs<A,B>(home,*this);
68  }
69 
70  template<class A, class B>
73  GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
74  if (x0.min() >= 0)
75  GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
76  else if (x0.max() <= 0)
77  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
78  else
79  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
80  return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
81  }
82 
83 }}}
84 
85 // STATISTICS: float-prop
86 
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition: abs.hpp:47
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3490
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:41
#define forceinline
Definition: config.hpp:185
Propagation has computed fixpoint.
Definition: core.hpp:476
Computation spaces.
Definition: core.hpp:1701
Base-class for both propagators and branchers.
Definition: core.hpp:627
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Propagator for bounds consistent absolute operator
Definition: arithmetic.hh:136
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:52
Float value type.
Definition: float.hh:334
Mixed binary propagator.
Definition: pattern.hpp:204
ExecStatus
Definition: core.hpp:471
Abs(Space &home, Abs &p)
Constructor for cloning p.
Definition: abs.hpp:61
Execution is okay.
Definition: core.hpp:475
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:292
Gecode toplevel namespace
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition: abs.hpp:66
int ModEventDelta
Modification event deltas.
Definition: core.hpp:89
Home class for posting propagators
Definition: core.hpp:853
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: abs.hpp:72