Jip J. Dekker
981be2067e
git-subtree-dir: software/gecode_on_replay git-subtree-split: 8051d92b9c89e49cccfbd1c201371580d7703ab4
117 lines
3.9 KiB
C++
Executable File
117 lines
3.9 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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* Guido Tack <tack@gecode.org>
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*
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* Copyright:
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* Guido Tack, 2012
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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_SEQ_RBS_HH
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#define GECODE_SEARCH_SEQ_RBS_HH
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#include <gecode/search.hh>
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namespace Gecode { namespace Search { namespace Seq {
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class RBS;
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/// %Stop-object for restart engine
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class GECODE_SEARCH_EXPORT RestartStop : public Stop {
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template<class,template<class>class> friend class ::Gecode::RBS;
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friend class ::Gecode::Search::Seq::RBS;
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private:
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/// The failure limit for the engine
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unsigned long long int l;
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/// The stop object for the meta engine
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Stop* m_stop;
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/// Whether the engine was stopped
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bool e_stopped;
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/// Accumulated statistics for the meta engine
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Statistics m_stat;
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public:
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/// Stop the meta engine if indicated by the stop object \a s
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RestartStop(Stop* s);
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/// Return true if meta engine must be stopped
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virtual bool stop(const Statistics& s, const Options& o);
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/// Set current limit for the engine to \a l fails
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void limit(const Statistics& s, unsigned long long int l);
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/// Update statistics
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void update(const Search::Statistics& s);
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/// Return whether the engine has been stopped
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bool enginestopped(void) const;
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/// Return statistics for the meta engine
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Statistics metastatistics(void) const;
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};
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/// Engine for restart-based search
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class GECODE_SEARCH_EXPORT RBS : public Engine {
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protected:
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/// The actual engine
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Engine* e;
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/// The master space to restart from
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Space* master;
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/// The last solution space (possibly nullptr)
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Space* last;
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/// The cutoff object
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Cutoff* co;
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/// The stop control object
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RestartStop* stop;
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/// How many solutions since the last restart
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unsigned long int sslr;
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/// Whether the slave can share info (AFC) with the master
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bool shared_info;
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/// Whether search for the next solution will be complete
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bool complete;
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/// Whether a restart must be performed when next is called
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bool restart;
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/// Whether the engine performs best solution search
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bool best;
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public:
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/// Constructor
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RBS(Space* s, RestartStop* stop0, Engine* e0,
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const Search::Statistics& stat, const Options& o, bool best);
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/// Return next solution (nullptr, if none exists or search has been stopped)
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virtual Space* next(void);
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/// Return statistics
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virtual Statistics statistics(void) const;
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/// Check whether engine has been stopped
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virtual bool stopped(void) const;
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/// Constrain future solutions to be better than \a b
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virtual void constrain(const Space& b);
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/// Destructor
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virtual ~RBS(void);
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};
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}}}
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#include <gecode/search/seq/rbs.hpp>
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#endif
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// STATISTICS: search-seq
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