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exp-log.hpp
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1/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2/*
3 * Main authors:
4 * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
5 *
6 * Copyright:
7 * Vincent Barichard, 2012
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
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33
34namespace Gecode { namespace Float { namespace Transcendental {
35
36 /*
37 * Bounds consistent exponential operator
38 *
39 */
40
41 template<class A, class B>
43 Exp<A,B>::Exp(Home home, A x0, B x1)
45
46 template<class A, class B>
48 Exp<A,B>::post(Home home, A x0, B x1) {
49 if (x0 == x1) {
50 return ES_FAILED;
51 } else {
52 GECODE_ME_CHECK(x1.gq(home,0.0));
53 }
54 GECODE_ME_CHECK(x1.eq(home,exp(x0.domain())));
55 if (x1.max() == 0.0)
56 return ES_FAILED;
57 GECODE_ME_CHECK(x0.eq(home,log(x1.domain())));
58 (void) new (home) Exp<A,B>(home,x0,x1);
59 return ES_OK;
60 }
61
62
63 template<class A, class B>
67
68 template<class A, class B>
69 Actor*
71 return new (home) Exp<A,B>(home,*this);
72 }
73
74 template<class A, class B>
77 GECODE_ME_CHECK(x1.eq(home,exp(x0.domain())));
78 if (x1.max() == 0.0)
79 return ES_FAILED;
80 GECODE_ME_CHECK(x0.eq(home,log(x1.domain())));
81 return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
82 }
83
84
85 /*
86 * Bounds consistent logarithm operator with base
87 *
88 */
89
90 template<class A, class B>
92 Pow<A,B>::Pow(Home home, FloatNum base0, A x0, B x1)
94 base(base0) {}
95
96 template<class A, class B>
98 Pow<A,B>::post(Home home, FloatNum base, A x0, B x1) {
99 if (base <= 0) return ES_FAILED;
100 if (x0 == x1) {
101 GECODE_ME_CHECK(x0.eq(home,0.0));
102 } else {
103 GECODE_ME_CHECK(x1.gq(home,0.0));
104 if (x1.max() == 0.0)
105 return ES_FAILED;
106 GECODE_ME_CHECK(x0.eq(home,log(x1.domain())/log(base)));
107 GECODE_ME_CHECK(x1.eq(home,exp(x0.domain()*log(base))));
108 (void) new (home) Pow<A,B>(home,base,x0,x1);
109 }
110 return ES_OK;
111 }
112
113 template<class A, class B>
117 base(p.base) {}
118
119 template<class A, class B>
120 Actor*
122 return new (home) Pow<A,B>(home,*this);
123 }
124
125 template<class A, class B>
128 if (x1.max() == 0.0)
129 return ES_FAILED;
130 GECODE_ME_CHECK(x0.eq(home,log(x1.domain())/log(base)));
131 GECODE_ME_CHECK(x1.eq(home,exp(x0.domain()*log(base))));
132 return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
133 }
134
135}}}
136
137// STATISTICS: float-prop
138
int p
Number of positive literals for node type.
Base-class for both propagators and branchers.
Definition core.hpp:628
Propagator for bounds consistent exp operator
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition exp-log.hpp:48
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition exp-log.hpp:70
Exp(Space &home, Exp &p)
Constructor for cloning p.
Definition exp-log.hpp:65
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition exp-log.hpp:76
Propagator for bounds consistent pow operator
static ExecStatus post(Home home, FloatNum base, A x0, B x1)
Post propagator for .
Definition exp-log.hpp:98
Pow(Space &home, Pow &p)
Constructor for cloning p.
Definition exp-log.hpp:115
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition exp-log.hpp:127
virtual Actor * copy(Space &home)
Create copy during cloning.
Definition exp-log.hpp:121
Home class for posting propagators
Definition core.hpp:856
Mixed binary propagator.
Definition pattern.hpp:204
Computation spaces.
Definition core.hpp:1742
ExecStatus ES_SUBSUMED(Propagator &p)
Definition core.hpp:3563
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
double FloatNum
Floating point number base type.
Definition float.hh:106
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition var-type.hpp:292
Gecode toplevel namespace
void log(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
void exp(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
@ ES_FAILED
Execution has resulted in failure.
Definition core.hpp:474
#define forceinline
Definition config.hpp:187