rbs.hh

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Guido Tack <tack@gecode.dev>
 *
 *  Contributing authors:
 *     Mikael Zayenz Lagerkvist <lagerkvist@gecode.dev>
 *
 *  Copyright:
 *     Guido Tack, 2012
 *     Mikael Zayenz Lagerkvist, 2026
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.dev
 *
 *  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
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 */
 
#ifndef GECODE_SEARCH_SEQ_RBS_HH
#define GECODE_SEARCH_SEQ_RBS_HH
 
#include <gecode/search.hh>
 
namespace Gecode { namespace Search { namespace Seq {
 
  class RBS;

  class GECODE_SEARCH_EXPORT RestartStop : public Stop {
    template<class,template<class>class> friend class ::Gecode::RBS;
    friend class ::Gecode::Search::Seq::RBS;
  private:
    mutable Support::Mutex m;
    unsigned long long int l;
    Stop* m_stop;
    bool e_stopped;
    Statistics m_stat;
  public:
    RestartStop(Stop* s);
    virtual bool stop(const Statistics& s, const Options& o);
    unsigned long int restarts(void) const;
    void restart(void);
    void nogood(unsigned long int n);
    SpaceStatus status(Space* s);
    void limit(const Statistics& s, unsigned long long int l);
    void update(const Search::Statistics& s);
    bool enginestopped(void) const;
    Statistics metastatistics(void) const;
  };

  class GECODE_SEARCH_EXPORT RBS : public Engine {
  protected:
    Engine* e;
    Space* master;
    Space* last;
    Cutoff* co;
    RestartStop* stop;
    unsigned long int sslr;
    bool complete;
    bool restart;
    bool best;
  public:
    RBS(Space* s, RestartStop* stop0, Engine* e0,
        const Search::Statistics& stat, const Options& o, bool best);
    virtual Space* next(void);
    virtual Statistics statistics(void) const;
    virtual bool stopped(void) const;
    virtual void constrain(const Space& b);
    virtual ~RBS(void);
  };
 
}}}
 
#include <gecode/search/seq/rbs.hpp>
 
#endif
 
// STATISTICS: search-seq