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relax.hh
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Christian Schulte <schulte@gecode.org>
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*
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* Copyright:
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* Christian Schulte, 2016
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#ifndef __GECODE_SEARCH_RELAX_HH__
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#define __GECODE_SEARCH_RELAX_HH__
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#include <
gecode/kernel.hh
>
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#include <
gecode/search.hh
>
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namespace
Gecode
{
namespace
Search {
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template
<
class
VarArgs,
class
Post>
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forceinline
void
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relax
(Home home,
const
VarArgs&
x
,
const
VarArgs& sx, Rnd
r
,
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double
p
, Post&
post
);
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template
<
class
VarArgs,
class
Post>
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forceinline
void
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relax
(
Home
home,
const
VarArgs&
x
,
const
VarArgs& sx,
Rnd
r
,
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double
p
, Post&
post
) {
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if
(home.
failed
())
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return
;
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Region
reg;
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// Which variables to assign
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Support::BitSet<Region>
ax(reg,
static_cast<
unsigned
int
>
(
x
.size()));
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// Select randomly with probability p to relax value
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for
(
int
i
=0;
i
<
x
.size();
i
++)
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if
(
r
(UINT_MAX) >=
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static_cast<
unsigned
int
>
(
p
*
static_cast<
double
>
(UINT_MAX)))
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ax.
set
(
static_cast<
unsigned
int
>
(
i
));
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if
(ax.
all
())
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// Choose one variable uniformly and unset it
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ax.
clear
(
r
(
static_cast<
unsigned
int
>
(
x
.size())));
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for
(
Iter::Values::BitSet
<
Support::BitSet<Region>
>
i
(ax);
i
(); ++
i
)
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if
(
post
(home,
x
[
i
.val()], sx[
i
.val()]) !=
ES_OK
) {
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home.
failed
();
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return
;
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}
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}
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}}
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#endif
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// STATISTICS: search-other
kernel.hh
Gecode::x
Post propagator for SetVar x
Definition:
set.hh:767
Gecode::Support::BitSetBase::set
void set(unsigned int i)
Set bit i.
Definition:
bitset-base.hpp:595
Gecode::Iter::Values::BitSet
Value iterator for values in a bitset.
Definition:
values-bitset.hpp:42
Gecode::Support::BitSetBase::all
bool all(void) const
Test whether all bits are set.
Definition:
bitset-base.hpp:617
search.hh
Gecode
Gecode toplevel namespace
Gecode::Support::BitSetBase::clear
void clear(unsigned int i)
Clear bit i.
Definition:
bitset-base.hpp:600
Gecode::Home
Home class for posting propagators
Definition:
core.hpp:856
Gecode::Region
Handle to region.
Definition:
region.hpp:55
Gecode::r
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition:
set.hh:767
Gecode::Search::relax
void relax(Home home, const VarArgs &x, const VarArgs &sx, Rnd r, double p, Post &post)
Relax variables in x from solution sx with probability p.
Definition:
relax.hh:51
Gecode::post
TFE post(PropagatorGroup g)
Only post functions (but not propagators) from g are considered.
Definition:
filter.cpp:138
Gecode::Rnd
Random number generator.
Definition:
rnd.hpp:42
Gecode::Home::failed
bool failed(void) const
Check whether corresponding space is failed.
Definition:
core.hpp:4048
Gecode::Support::BitSet< Region >
forceinline
#define forceinline
Definition:
config.hpp:185
Test::Int::Basic::i
Gecode::IntArgs i({1, 2, 3, 4})
Gecode::ES_OK
@ ES_OK
Execution is okay.
Definition:
core.hpp:476
p
int p
Number of positive literals for node type.
Definition:
bool-expr.cpp:232