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val-commit.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  *
6  * Contributing authors:
7  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
8  *
9  * Copyright:
10  * Christian Schulte, 2012
11  * Vincent Barichard, 2012
12  *
13  * Last modified:
14  * $Date: 2013-07-04 17:03:13 +0200 (Thu, 04 Jul 2013) $ by $Author: schulte $
15  * $Revision: 13801 $
16  *
17  * This file is part of Gecode, the generic constraint
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19  * http://www.gecode.org
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41 
42 namespace Gecode { namespace Float { namespace Branch {
43 
46  : ValCommit<FloatView,FloatVal>(home,vb) {}
49  : ValCommit<FloatView,FloatVal>(home,shared,vc) {}
51  ValCommitLqGq::commit(Space& home, unsigned int a, FloatView x, int,
52  FloatNumBranch nl) {
53  // Should we try the smaller half first?
54  if ((a == 0) == nl.l) {
55  if ((x.min() == nl.n) || (x.max() == nl.n))
56  return x.eq(home,x.min());
57  else
58  return x.lq(home,nl.n);
59  } else {
60  if ((x.min() == nl.n) || (x.max() == nl.n))
61  return x.eq(home,x.max());
62  else
63  return x.gq(home,nl.n);
64  }
65  }
68  return NULL;
69  }
70  forceinline void
71  ValCommitLqGq::print(const Space&, unsigned int a, FloatView, int i,
72  FloatNumBranch nl,
73  std::ostream& o) const {
74  o << "var[" << i << "] "
75  << (((a == 0) == nl.l) ? "<=" : ">=") << "(" << nl.n << ")";
76  }
77 
78 }}}
79 
80 // STATISTICS: float-branch
81 
FloatNum min(void) const
Return minimum of domain.
Definition: float.hpp:64
ModEvent gq(Space &home, int n)
Restrict domain values to be greater or equal than n.
Definition: float.hpp:122
Value commit class for less or equal or greater or equal.
Definition: branch.hh:279
int ModEvent
Type for modification events.
Definition: core.hpp:146
ValCommitLqGq(Space &home, const ValBranch &vb)
Constructor for initialization.
Definition: val-commit.hpp:45
ModEvent commit(Space &home, unsigned int a, FloatView x, int i, FloatNumBranch n)
Commit view x at position i to value n for alternative a.
Definition: val-commit.hpp:51
Computation spaces.
Definition: core.hpp:1362
ModEvent eq(Space &home, int n)
Restrict domain values to be equal to n.
Definition: float.hpp:135
void print(const Space &home, unsigned int a, FloatView x, int i, FloatNumBranch n, std::ostream &o) const
Print on o the alternative with view x at position i and value n.
Definition: val-commit.hpp:71
Base class for value commit.
Gecode::IntArgs i(4, 1, 2, 3, 4)
FloatNum n
The middle value for branching.
Definition: float.hh:1375
Value description class for branching.
Definition: float.hh:1372
bool l
Whether to try the lower or upper half first.
Definition: float.hh:1377
Float view for float variables.
Definition: view.hpp:56
Value branching information.
Definition: branch-val.hpp:44
Float value type.
Definition: float.hh:321
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:253
#define forceinline
Definition: config.hpp:132
NGL * ngl(Space &home, unsigned int a, FloatView x, FloatNumBranch n) const
Create no-good literal for alternative a.
Definition: val-commit.hpp:67
bool shared(const ConstView< ViewA > &, const ConstView< ViewB > &)
Test whether views share same variable.
Definition: view.hpp:662
FloatNum max(void) const
Return maximum of domain.
Definition: float.hpp:68
Gecode toplevel namespace
ModEvent lq(Space &home, int n)
Restrict domain values to be less or equal than n.
Definition: float.hpp:109
struct Gecode::@518::NNF::@57::@59 a
For atomic nodes.
No-good literal recorded during search.
Definition: core.hpp:971