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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Guido Tack <tack@gecode.org>
*
* Copyright:
* Guido Tack, 2012
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef GECODE_SEARCH_SEQ_RBS_HH
#define GECODE_SEARCH_SEQ_RBS_HH
#include <gecode/search.hh>
namespace Gecode { namespace Search { namespace Seq {
class RBS;
/// %Stop-object for restart engine
class GECODE_SEARCH_EXPORT RestartStop : public Stop {
template<class,template<class>class> friend class ::Gecode::RBS;
friend class ::Gecode::Search::Seq::RBS;
private:
/// The failure limit for the engine
unsigned long long int l;
/// The stop object for the meta engine
Stop* m_stop;
/// Whether the engine was stopped
bool e_stopped;
/// Accumulated statistics for the meta engine
Statistics m_stat;
public:
/// Stop the meta engine if indicated by the stop object \a s
RestartStop(Stop* s);
/// Return true if meta engine must be stopped
virtual bool stop(const Statistics& s, const Options& o);
/// Set current limit for the engine to \a l fails
void limit(const Statistics& s, unsigned long long int l);
/// Update statistics
void update(const Search::Statistics& s);
/// Return whether the engine has been stopped
bool enginestopped(void) const;
/// Return statistics for the meta engine
Statistics metastatistics(void) const;
};
/// Engine for restart-based search
class GECODE_SEARCH_EXPORT RBS : public Engine {
protected:
/// The actual engine
Engine* e;
/// The master space to restart from
Space* master;
/// The last solution space (possibly nullptr)
Space* last;
/// The cutoff object
Cutoff* co;
/// The stop control object
RestartStop* stop;
/// How many solutions since the last restart
unsigned long int sslr;
/// Whether search for the next solution will be complete
bool complete;
/// Whether a restart must be performed when next is called
bool restart;
/// Whether the engine performs best solution search
bool best;
public:
/// Constructor
RBS(Space* s, RestartStop* stop0, Engine* e0,
const Search::Statistics& stat, const Options& o, bool best);
/// Return next solution (nullptr, if none exists or search has been stopped)
virtual Space* next(void);
/// Return statistics
virtual Statistics statistics(void) const;
/// Check whether engine has been stopped
virtual bool stopped(void) const;
/// Constrain future solutions to be better than \a b
virtual void constrain(const Space& b);
/// Destructor
virtual ~RBS(void);
};
}}}
#include <gecode/search/seq/rbs.hpp>
#endif
// STATISTICS: search-seq
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