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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
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13  * Last modified:
14  * $Date: 2017-04-10 13:21:37 +0200 (Mon, 10 Apr 2017) $ by $Author: schulte $
15  * $Revision: 15631 $
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41 
42 namespace Gecode { namespace Float { namespace Arithmetic {
43 
44  template<class A, class B>
46  Abs<A,B>::Abs(Home home, A x0, B x1)
47  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
48 
49  template<class A, class B>
51  Abs<A,B>::post(Home home, A x0, B x1) {
52  (void) new (home) Abs<A,B>(home,x0,x1);
53  return ES_OK;
54  }
55 
56  template<class A, class B>
58  Abs<A,B>::Abs(Space& home, bool share, Abs<A,B>& p)
59  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p) {}
60 
61  template<class A, class B>
62  Actor*
63  Abs<A,B>::copy(Space& home, bool share) {
64  return new (home) Abs<A,B>(home,share,*this);
65  }
66 
67  template<class A, class B>
70  GECODE_ME_CHECK(x1.eq(home,abs(x0.val())));
71  if (x0.min() >= 0)
72  GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(), x1.max())));
73  else if (x0.max() <= 0)
74  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), -x1.min())));
75  else
76  GECODE_ME_CHECK(x0.eq(home,FloatVal(-x1.max(), x1.max())));
77  return (x0.assigned() && x1.assigned()) ? home.ES_SUBSUMED(*this) : ES_FIX;
78  }
79 
80 }}}
81 
82 // STATISTICS: float-prop
83 
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: abs.hpp:63
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition: abs.hpp:51
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:3614
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:45
Propagation has computed fixpoint.
Definition: core.hpp:545
Computation spaces.
Definition: core.hpp:1748
Base-class for both propagators and branchers.
Definition: core.hpp:696
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Propagator for bounds consistent absolute operator
Definition: arithmetic.hh:140
Abs(Space &home, bool share, Abs &p)
Constructor for cloning p.
Definition: abs.hpp:58
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:56
Float value type.
Definition: float.hh:338
Mixed binary propagator.
Definition: propagator.hpp:213
ExecStatus
Definition: core.hpp:540
#define forceinline
Definition: config.hpp:173
Execution is okay.
Definition: core.hpp:544
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:292
Gecode toplevel namespace
int ModEventDelta
Modification event deltas.
Definition: core.hpp:169
Home class for posting propagators
Definition: core.hpp:922
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: abs.hpp:69