rbs.hh

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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
 *
 *  Last modified:
 *     $Date: 2015-03-19 14:02:56 +0100 (Thu, 19 Mar 2015) $ by $Author: schulte $
 *     $Revision: 14468 $
 *
 *  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
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 *  permit persons to whom the Software is furnished to do so, subject to
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 *  included in all copies or substantial portions of the Software.
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 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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#ifndef __GECODE_SEARCH_META_RBS_HH__
#define __GECODE_SEARCH_META_RBS_HH__

#include <gecode/search.hh>

namespace Gecode { namespace Search { namespace Meta {

  class RBS;

  class GECODE_SEARCH_EXPORT RestartStop : public Stop {
    template<template<class>class,class> friend class ::Gecode::RBS;
    friend class ::Gecode::Search::Meta::RBS;
  private:
    FailStop* e_stop;
    Stop* m_stop;
    bool e_stopped;
    Statistics m_stat;
  public:
    RestartStop(Stop* s);
    virtual bool stop(const Statistics& s, const Options& o);
    void limit(const Search::Statistics& s, unsigned long int l);
    void update(const Search::Statistics& s);
    Stop* enginestop(void) const;
    bool enginestopped(void) const;
    Statistics metastatistics(void) const;
    ~RestartStop(void);
  };

  class GECODE_SEARCH_EXPORT RBS : public Engine {
  protected:
    Engine* e;
    Space* master;
    Space* last;
    Cutoff* co;
    RestartStop* stop;
    unsigned long int sslr;
    bool shared;
    bool complete;
    bool restart;
  public:
    RBS(Space* s, RestartStop* stop0, Engine* e0, const Options& o);
    virtual Space* next(void);
    virtual Search::Statistics statistics(void) const;
    virtual bool stopped(void) const;
    virtual ~RBS(void);
  };

  /*
   * Stopping for meta search engines
   *
   */

  forceinline
  RestartStop::RestartStop(Stop* s) 
    : e_stop(new FailStop(0)), m_stop(s), e_stopped(false) {}

  forceinline void
  RestartStop::limit(const Search::Statistics& s, unsigned long int l) {
    m_stat += s;
    e_stopped = false;
    e_stop->limit(l);
  }

  forceinline void
  RestartStop::update(const Search::Statistics& s) {
    m_stat += s;
  }

  forceinline Stop*
  RestartStop::enginestop(void) const { 
    return e_stop; 
  }

  forceinline bool
  RestartStop::enginestopped(void) const { 
    return e_stopped; 
  }

  forceinline Statistics 
  RestartStop::metastatistics(void) const { 
    return m_stat; 
  }

  forceinline
  RestartStop::~RestartStop(void) {
    delete e_stop;
    delete m_stop;
  }



  forceinline
  RBS::RBS(Space* s, RestartStop* stop0,
           Engine* e0, const Options& opt)
    : e(e0), master(s), last(NULL), co(opt.cutoff), stop(stop0),
      sslr(0),
      shared(opt.threads == 1), complete(true), restart(false) {
    stop->limit(Statistics(),(*co)());
  }

}}}

#endif

// STATISTICS: search-meta