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channel.cpp
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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  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
6  *
7  * Copyright:
8  * Christian Schulte, 2006
9  * Vincent Barichard, 2012
10  *
11  * This file is part of Gecode, the generic constraint
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13  * http://www.gecode.org
14  *
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35 
36 #include "test/float.hh"
37 
38 #include <gecode/minimodel.hh>
39 
40 namespace Test { namespace Float {
41 
43  namespace Channel {
44 
46  class Int : public Test {
47  public:
50  : Test("Channel::Int",2,-1,2,st,CPLT_ASSIGNMENT,false) {}
52  virtual MaybeType solution(const Assignment& x) const {
53  Gecode::FloatNum tmp;
54  return (((modf(x[0].min(),&tmp)==0) ||
55  (modf(x[0].max(),&tmp)==0))
56  && (x[0]==x[1])) ? MT_TRUE : MT_FALSE;
57  }
59  virtual void post(Gecode::Space& home, Gecode::FloatVarArray& x) {
60  using namespace Gecode;
61  IntVar iv(home,-1000,1000);
62  channel(home, x[0], iv);
63  channel(home, iv, x[1]);
64  }
65  };
66 
68  class Bool : public Test {
69  public:
72  : Test("Channel::Bool",2,0,1,st,CPLT_ASSIGNMENT,false) {}
74  virtual MaybeType solution(const Assignment& x) const {
75  Gecode::FloatNum tmp;
76  return (((modf(x[0].min(),&tmp)==0) ||
77  (modf(x[0].max(),&tmp)==0))
78  && (x[0]==x[1])) ? MT_TRUE : MT_FALSE;
79  }
81  virtual void post(Gecode::Space& home, Gecode::FloatVarArray& x) {
82  using namespace Gecode;
83  BoolVar bv(home,0,1);
84  channel(home, x[0], bv);
85  channel(home, bv, x[1]);
86  }
87  };
88 
91 
95 
96  }
97 }}
98 
99 // STATISTICS: test-float
100 
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
Boolean integer variables.
Definition: int.hh:512
Float variable array.
Definition: float.hh:1030
Integer variables.
Definition: int.hh:371
Computation spaces.
Definition: core.hpp:1742
Base class for assignments
Definition: float.hh:80
Test channel between float and Boolean
Definition: channel.cpp:68
virtual void post(Gecode::Space &home, Gecode::FloatVarArray &x)
Post constraint on x.
Definition: channel.cpp:81
Bool(Gecode::FloatNum st)
Construct and register test.
Definition: channel.cpp:71
virtual MaybeType solution(const Assignment &x) const
Check whether x is solution.
Definition: channel.cpp:74
Test channel between float and integer
Definition: channel.cpp:46
virtual MaybeType solution(const Assignment &x) const
Check whether x is solution.
Definition: channel.cpp:52
virtual void post(Gecode::Space &home, Gecode::FloatVarArray &x)
Post constraint on x.
Definition: channel.cpp:59
Int(Gecode::FloatNum st)
Construct and register test.
Definition: channel.cpp:49
void channel(Home home, FloatVar x0, IntVar x1)
Post propagator for channeling a float and an integer variable .
Definition: channel.cpp:41
double FloatNum
Floating point number base type.
Definition: float.hh:106
const FloatNum max
Largest allowed float value.
Definition: float.hh:844
const FloatNum min
Smallest allowed float value.
Definition: float.hh:846
Gecode::FloatNum step2
Definition: channel.cpp:90
Gecode::FloatNum step1
Definition: channel.cpp:89
@ CPLT_ASSIGNMENT
Definition: float.hh:62
MaybeType
Type for comparisons and solutions.
Definition: float.hh:51
@ MT_FALSE
Definition: float.hh:52
@ MT_TRUE
Definition: float.hh:53
General test support.
Definition: afc.cpp:39