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optimize.cpp
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2 /*
3  * Main author:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2008
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10  * $Date: 2015-03-18 14:04:51 +0100 (Wed, 18 Mar 2015) $ by $Author: schulte $
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37 
38 #include <gecode/minimodel.hh>
39 
40 namespace Gecode {
41 
42  void
44  const IntMinimizeSpace* best =
45  dynamic_cast<const IntMinimizeSpace*>(&_best);
46  if (best == NULL)
47  throw DynamicCastFailed("IntMinimizeSpace::constrain");
48  rel(*this, cost(), IRT_LE, best->cost().val());
49  }
50 
51 
52  void
54  const IntMaximizeSpace* best =
55  dynamic_cast<const IntMaximizeSpace*>(&_best);
56  if (best == NULL)
57  throw DynamicCastFailed("IntMaximizeSpace::constrain");
58  rel(*this, cost(), IRT_GR, best->cost().val());
59  }
60 
61 
62 #ifdef GECODE_HAS_FLOAT_VARS
63 
64  void
66  const FloatMinimizeSpace* best =
67  dynamic_cast<const FloatMinimizeSpace*>(&_best);
68  if (best == NULL)
69  throw DynamicCastFailed("FloatMinimizeSpace::constrain");
70  rel(*this, cost(), FRT_LE, best->cost().val()-step);
71  }
72 
73 
74  void
76  const FloatMaximizeSpace* best =
77  dynamic_cast<const FloatMaximizeSpace*>(&_best);
78  if (best == NULL)
79  throw DynamicCastFailed("FloatMaximizeSpace::constrain");
80  rel(*this, cost(), FRT_GR, best->cost().val()+step);
81  }
82 
83 #endif
84 
85 }
86 
87 // STATISTICS: minimodel-search
88 
Class for minimizing integer cost.
Definition: minimodel.hh:2208
virtual IntVar cost(void) const =0
Return variable with current cost.
FloatNum step
Step by which a next solution has to have lower cost.
Definition: minimodel.hh:2289
Less ( )
Definition: float.hh:1058
Greater ( )
Definition: int.hh:909
Class for maximizing float cost.
Definition: minimodel.hh:2286
Computation spaces.
Definition: core.hpp:1362
virtual void constrain(const Space &best)
Member function constraining according to decreasing cost.
Definition: optimize.cpp:43
virtual void constrain(const Space &best)
Member function constraining according to cost.
Definition: optimize.cpp:65
virtual void constrain(const Space &best)
Member function constraining according to increasing cost.
Definition: optimize.cpp:53
virtual FloatVar cost(void) const =0
Return variable with current cost.
Exception: dynamic cast failed
Definition: exception.hpp:71
Less ( )
Definition: int.hh:907
virtual void constrain(const Space &best)
Member function constraining according to cost.
Definition: optimize.cpp:75
Greater ( )
Definition: float.hh:1060
Class for maximizing integer cost.
Definition: minimodel.hh:2225
FloatVal val(void) const
Return assigned value.
Definition: float.hpp:57
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:47
virtual IntVar cost(void) const =0
Return variable with current cost.
int val(void) const
Return assigned value.
Definition: int.hpp:60
Class for minimizing float cost.
Definition: minimodel.hh:2261
Gecode toplevel namespace
virtual FloatVar cost(void) const =0
Return variable with current cost.
FloatNum step
Step by which a next solution has to have lower cost.
Definition: minimodel.hh:2264