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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 *
13 * This file is part of Gecode, the generic constraint
14 * development environment:
15 * http://www.gecode.org
16 *
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37
38namespace Gecode { namespace Float { namespace Arithmetic {
39
40 template<class A, class B>
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
Base-class for both propagators and branchers.
Definition core.hpp:628
Float value type.
Definition float.hh:334
Abs(Space &home, Abs &p)
Constructor for cloning p.
Definition abs.hpp:61
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition abs.hpp:47
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition abs.hpp:72
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition abs.hpp:66
Home class for posting propagators
Definition core.hpp:856
MixBinaryPropagator(Space &home, MixBinaryPropagator &p)
Definition pattern.hpp:597
friend class Space
Definition core.hpp:1068
ExecStatus ES_SUBSUMED(Propagator &p)
Propagator p is subsumed
Definition core.hpp:3570
int ModEventDelta
Modification event deltas.
Definition core.hpp:89
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition macros.hpp:52
Arithmetic propagators
Floating point numbers.
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:292
Gecode toplevel namespace
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
ExecStatus
Definition core.hpp:472
@ ES_OK
Execution is okay.
Definition core.hpp:476
@ ES_FIX
Propagation has computed fixpoint.
Definition core.hpp:477
#define forceinline
Definition config.hpp:194