Jip J. Dekker
981be2067e
git-subtree-dir: software/gecode_on_replay git-subtree-split: 8051d92b9c89e49cccfbd1c201371580d7703ab4
78 lines
2.6 KiB
C++
Executable File
78 lines
2.6 KiB
C++
Executable File
/* -*- 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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/// Relax variables in \a x from solution \a sx with probability \a p
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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
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