rbs.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2014
 *     Guido Tack, 2012
 *
 *  Last modified:
 *     $Date: 2016-04-19 17:19:45 +0200 (Tue, 19 Apr 2016) $ by $Author: schulte $
 *     $Revision: 14967 $
 *
 *  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,
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 *  permit persons to whom the Software is furnished to do so, subject to
 *  the following conditions:
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 *  included in all copies or substantial portions of the Software.
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#include <gecode/search/support.hh>
#include <gecode/search/meta/dead.hh>

namespace Gecode { namespace Search { namespace Meta {

  GECODE_SEARCH_EXPORT Stop*
  stop(Stop* so);

  GECODE_SEARCH_EXPORT Engine*
  engine(Space* master, Stop* stop, Engine* slave,
         const Search::Statistics& stat, const Options& opt,
         bool best);

}}}

namespace Gecode { namespace Search {

  template<class T, template<class> class E>
  class RbsBuilder : public Builder {
    using Builder::opt;
  public:
    RbsBuilder(const Options& opt);
    virtual Engine* operator() (Space* s) const;
  };

  template<class T, template<class> class E>
  inline
  RbsBuilder<T,E>::RbsBuilder(const Options& opt)
    : Builder(opt,E<T>::best) {}

  template<class T, template<class> class E>
  Engine*
  RbsBuilder<T,E>::operator() (Space* s) const {
    return build<T,RBS<T,E> >(s,opt);
  }

}}

namespace Gecode {

  template<class T, template<class> class E>
  inline
  RBS<T,E>::RBS(T* s, const Search::Options& m_opt) {
    if (m_opt.cutoff == NULL)
      throw Search::UninitializedCutoff("RBS::RBS");
    Search::Options e_opt(m_opt.expand());
    Search::Statistics stat;
    e_opt.clone = false;
    e_opt.stop  = Search::Meta::stop(m_opt.stop);
    Space* master;
    Space* slave;
    if (s->status(stat) == SS_FAILED) {
      stat.fail++;
      master = NULL;
      slave  = NULL;
      e = new Search::Meta::Dead(stat);
    } else {
      master = m_opt.clone ? s->clone() : s;
      slave  = master->clone(true,m_opt.share_rbs);
      MetaInfo mi(0,0,0,NULL,NoGoods::eng);
      slave->slave(mi);
      e = Search::Meta::engine(master,e_opt.stop,Search::build<T,E>(slave,e_opt),
                               stat,m_opt,E<T>::best);
    }
  }


  template<class T, template<class> class E>
  inline T*
  rbs(T* s, const Search::Options& o) {
    RBS<T,E> r(s,o);
    return r.next();
  }

  template<class T, template<class> class E>
  SEB
  rbs(const Search::Options& o) {
    if (o.cutoff == NULL)
      throw Search::UninitializedCutoff("rbs");
    return new Search::RbsBuilder<T,E>(o);
  }


}

// STATISTICS: search-meta