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exp-log.hpp
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2 /*
3  * Main authors:
4  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
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6  * Copyright:
7  * Vincent Barichard, 2012
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9  * Last modified:
10  * $Date: 2012-07-27 10:25:47 +0200 (Fri, 27 Jul 2012) $ by $Author: vbarichard $
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37 
38 namespace Gecode { namespace Float { namespace Transcendental {
39 
40  /*
41  * Bounds consistent exponential operator
42  *
43  */
44 
45  template<class A, class B>
47  Exp<A,B>::Exp(Home home, A x0, B x1)
48  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,x0,x1) {}
49 
50  template<class A, class B>
52  Exp<A,B>::post(Home home, A x0, B x1) {
53  if (same(x0,x1)) {
54  return ES_FAILED;
55  } else {
56  GECODE_ME_CHECK(x1.gq(home,0.0));
57  }
58 
59  (void) new (home) Exp<A,B>(home,x0,x1);
60  return ES_OK;
61  }
62 
63 
64  template<class A, class B>
66  Exp<A,B>::Exp(Space& home, bool share, Exp<A,B>& p)
67  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p) {}
68 
69  template<class A, class B>
70  Actor*
71  Exp<A,B>::copy(Space& home, bool share) {
72  return new (home) Exp<A,B>(home,share,*this);
73  }
74 
75  template<class A, class B>
78  GECODE_ME_CHECK(x1.eq(home,exp(x0.domain())));
79  if (x1.max() == 0.0)
80  return ES_FAILED;
81  GECODE_ME_CHECK(x0.eq(home,log(x1.domain())));
82  return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
83  }
84 
85 
86  /*
87  * Bounds consistent logarithm operator with base
88  *
89  */
90 
91  template<class A, class B>
93  Pow<A,B>::Pow(Home home, FloatNum base0, A x0, B x1)
95  base(base0) {}
96 
97  template<class A, class B>
99  Pow<A,B>::post(Home home, FloatNum base, A x0, B x1) {
100  if (base <= 0) return ES_FAILED;
101  if (same(x0,x1)) {
102  GECODE_ME_CHECK(x0.eq(home,0.0));
103  } else {
104  GECODE_ME_CHECK(x1.gq(home,0.0));
105  (void) new (home) Pow<A,B>(home,base,x0,x1);
106  }
107  return ES_OK;
108  }
109 
110  template<class A, class B>
112  Pow<A,B>::Pow(Space& home, bool share, Pow<A,B>& p)
113  : MixBinaryPropagator<A,PC_FLOAT_BND,B,PC_FLOAT_BND>(home,share,p),
114  base(p.base) {}
115 
116  template<class A, class B>
117  Actor*
118  Pow<A,B>::copy(Space& home, bool share) {
119  return new (home) Pow<A,B>(home,share,*this);
120  }
121 
122  template<class A, class B>
123  ExecStatus
125  if (x1.max() == 0.0)
126  return ES_FAILED;
127  GECODE_ME_CHECK(x0.eq(home,log(x1.domain())/log(base)));
128  GECODE_ME_CHECK(x1.eq(home,exp(x0.domain()*log(base))));
129  return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
130  }
131 
132 }}}
133 
134 // STATISTICS: float-prop
135 
ExecStatus ES_SUBSUMED(Propagator &p)
Definition: core.hpp:2973
void log(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:151
Propagator for bounds consistent pow operator
static ExecStatus post(Home home, A x0, B x1)
Post propagator for .
Definition: exp-log.hpp:52
Propagation has computed fixpoint.
Definition: core.hpp:528
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: exp-log.hpp:118
Exp(Space &home, bool share, Exp &p)
Constructor for cloning p.
Definition: exp-log.hpp:66
Computation spaces.
Definition: core.hpp:1362
Base-class for both propagators and branchers.
Definition: core.hpp:666
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: exp-log.hpp:77
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
bool same(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether two views are the same.
Definition: view.hpp:603
Execution has resulted in failure.
Definition: core.hpp:525
#define GECODE_ME_CHECK(me)
Check whether modification event me is failed, and forward failure.
Definition: macros.hpp:45
Propagator for bounds consistent exp operator
virtual ExecStatus propagate(Space &home, const ModEventDelta &med)
Perform propagation.
Definition: exp-log.hpp:124
Pow(Space &home, bool share, Pow &p)
Constructor for cloning p.
Definition: exp-log.hpp:112
Mixed binary propagator.
Definition: propagator.hpp:203
ExecStatus
Definition: core.hpp:523
#define forceinline
Definition: config.hpp:132
static ExecStatus post(Home home, FloatNum base, A x0, B x1)
Post propagator for .
Definition: exp-log.hpp:99
Execution is okay.
Definition: core.hpp:527
virtual Actor * copy(Space &home, bool share)
Create copy during cloning.
Definition: exp-log.hpp:71
const Gecode::PropCond PC_FLOAT_BND
Propagate when minimum or maximum of a view changes.
Definition: var-type.hpp:292
Gecode toplevel namespace
void exp(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:144
int ModEventDelta
Modification event deltas.
Definition: core.hpp:173
Home class for posting propagators
Definition: core.hpp:717
double FloatNum
Floating point number base type.
Definition: float.hh:108