search.hh

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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, 2002
 *     Guido Tack, 2004
 *
 *  Last modified:
 *     $Date: 2016-10-25 12:52:26 +0200 (Tue, 25 Oct 2016) $ by $Author: schulte $
 *     $Revision: 15233 $
 *
 *  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_HH__
#define __GECODE_SEARCH_HH__

#include <gecode/kernel.hh>

/*
 * Configure linking
 *
 */
#if !defined(GECODE_STATIC_LIBS) && \
    (defined(__CYGWIN__) || defined(__MINGW32__) || defined(_MSC_VER))

#ifdef GECODE_BUILD_SEARCH
#define GECODE_SEARCH_EXPORT __declspec( dllexport )
#else
#define GECODE_SEARCH_EXPORT __declspec( dllimport )
#endif

#else

#ifdef GECODE_GCC_HAS_CLASS_VISIBILITY
#define GECODE_SEARCH_EXPORT __attribute__ ((visibility("default")))
#else
#define GECODE_SEARCH_EXPORT
#endif

#endif

// Configure auto-linking
#ifndef GECODE_BUILD_SEARCH
#define GECODE_LIBRARY_NAME "Search"
#include <gecode/support/auto-link.hpp>
#endif


namespace Gecode { namespace Search {

  namespace Sequential {}

  namespace Parallel {}

  namespace Meta {}

  namespace Meta {

    namespace Sequential {}

    namespace Parallel {}

  }


  namespace Config {
    const bool clone = true;
    const double threads = 1.0;

    const unsigned int c_d = 8;
    const unsigned int a_d = 2;

    const unsigned int steal_limit = 3;
    const unsigned int initial_delay = 5;

    const unsigned int d_l = 5;

    const double base = 1.5;
    const unsigned int slice = 250;

    const unsigned int nogoods_limit = 128;
  }

}}

#include <gecode/search/exception.hpp>

namespace Gecode { namespace Search {

  class Statistics : public StatusStatistics {
  public:
    unsigned long int fail;
    unsigned long int node;
    unsigned long int depth;
    unsigned long int restart;
    unsigned long int nogood;
    Statistics(void);
    void reset(void);
    Statistics operator +(const Statistics& s);
    Statistics& operator +=(const Statistics& s);
  };

}}

#include <gecode/search/statistics.hpp>

namespace Gecode { namespace Search {

  class GECODE_SEARCH_EXPORT Cutoff : public HeapAllocated {
  public:


    Cutoff(void);
    virtual unsigned long int operator ()(void) const = 0;
    virtual unsigned long int operator ++(void) = 0;
    virtual ~Cutoff(void);



    static Cutoff*
    constant(unsigned long int scale=Config::slice);
    static Cutoff*
    linear(unsigned long int scale=Config::slice);
    static Cutoff*
    geometric(unsigned long int scale=Config::slice, double base=Config::base);
    static Cutoff*
    luby(unsigned long int scale=Config::slice);
    static Cutoff*
    rnd(unsigned int seed,
        unsigned long int min, unsigned long int max,
        unsigned long int n);
    static Cutoff*
    append(Cutoff* c1, unsigned long int n, Cutoff* c2);
    static Cutoff*
    merge(Cutoff* c1, Cutoff* c2);
    static Cutoff*
    repeat(Cutoff* c, unsigned long int n);
  };

  class GECODE_SEARCH_EXPORT CutoffConstant : public Cutoff {
  protected:
    unsigned long int c;
  public:
    CutoffConstant(unsigned long int c);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
  };

  class GECODE_SEARCH_EXPORT CutoffLinear : public Cutoff {
  protected:
    unsigned long int scale;
    unsigned long int n;
  public:
    CutoffLinear(unsigned long int scale);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
  };

  class GECODE_SEARCH_EXPORT CutoffLuby : public Cutoff {
  protected:
    unsigned long int i;
    unsigned long int scale;
    static const unsigned long int n_start = 63U;
    static unsigned long int start[n_start];
    static unsigned long int log(unsigned long int i);
    static unsigned long int luby(unsigned long int i);
  public:
    CutoffLuby(unsigned long int scale);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
  };

  class GECODE_SEARCH_EXPORT CutoffGeometric : public Cutoff {
  protected:
    double n;
    double scale;
    double base;
  public:
    CutoffGeometric(unsigned long int scale, double base);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
  };

  class GECODE_SEARCH_EXPORT CutoffRandom : public Cutoff {
  protected:
    Support::RandomGenerator rnd;
    unsigned long int min;
    unsigned long int n;
    unsigned long int step;
    unsigned long int cur;
  public:
    CutoffRandom(unsigned int seed,
                 unsigned long int min, unsigned long int max,
                 unsigned long int n);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
  };

  class GECODE_SEARCH_EXPORT CutoffAppend : public Cutoff {
  protected:
    Cutoff* c1;
    Cutoff* c2;
    unsigned long int n;
  public:
    CutoffAppend(Cutoff* c1, unsigned long int n, Cutoff* c2);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
    virtual ~CutoffAppend(void);
  };

  class GECODE_SEARCH_EXPORT CutoffMerge : public Cutoff {
  protected:
    Cutoff* c1;
    Cutoff* c2;
  public:
    CutoffMerge(Cutoff* c1, Cutoff* c2);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
    virtual ~CutoffMerge(void);
  };

  class GECODE_SEARCH_EXPORT CutoffRepeat : public Cutoff {
  protected:
    Cutoff* c;
    // Current cutoff
    unsigned int cutoff;
    // Iteration
    unsigned long int i;
    // Number of repetitions
    unsigned long int n;
  public:
    CutoffRepeat(Cutoff* c, unsigned long int n);
    virtual unsigned long int operator ()(void) const;
    virtual unsigned long int operator ++(void);
    virtual ~CutoffRepeat(void);
  };

}}

#include <gecode/search/cutoff.hpp>

namespace Gecode { namespace Search {

    class Stop;

    class Options {
    public:
      bool clone;
      double threads;
      unsigned int c_d;
      unsigned int a_d;
      unsigned int d_l;
      bool share_rbs;
      bool share_pbs;
      unsigned int assets;
      unsigned int slice;
      unsigned int nogoods_limit;
      Stop* stop;
      Cutoff* cutoff;
      GECODE_SEARCH_EXPORT static const Options def;
      Options(void);
      GECODE_SEARCH_EXPORT Options
      expand(void) const;
    };

}}

#include <gecode/search/options.hpp>

namespace Gecode { namespace Search {

  class GECODE_SEARCH_EXPORT Stop : public HeapAllocated {
  public:


    Stop(void);
    virtual bool stop(const Statistics& s, const Options& o) = 0;
    virtual ~Stop(void);



    static Stop* node(unsigned long int l);
    static Stop* fail(unsigned long int l);
    static Stop* time(unsigned long int l);
  };

  class GECODE_SEARCH_EXPORT NodeStop : public Stop {
  protected:
    unsigned long int l;
  public:
    NodeStop(unsigned long int l);
    unsigned long int limit(void) const;
    void limit(unsigned long int l);
    virtual bool stop(const Statistics& s, const Options& o);
  };

  class GECODE_SEARCH_EXPORT FailStop : public Stop {
  protected:
    unsigned long int l;
  public:
    FailStop(unsigned long int l);
    unsigned long int limit(void) const;
    void limit(unsigned long int l);
    virtual bool stop(const Statistics& s, const Options& o);
  };

  class GECODE_SEARCH_EXPORT TimeStop : public Stop {
  protected:
    Support::Timer t;
    unsigned long int l;
  public:
    TimeStop(unsigned long int l);
    unsigned long int limit(void) const;
    void limit(unsigned long int l);
    void reset(void);
    virtual bool stop(const Statistics& s, const Options& o);
  };

}}

#include <gecode/search/stop.hpp>

namespace Gecode { namespace Search {

  class GECODE_SEARCH_EXPORT Engine : public HeapAllocated {
  public:
    virtual Space* next(void) = 0;
    virtual Statistics statistics(void) const = 0;
    virtual bool stopped(void) const = 0;
    virtual void constrain(const Space& b);
    virtual void reset(Space* s);
    virtual NoGoods& nogoods(void);
    virtual ~Engine(void);
  };

}}

#include <gecode/search/engine.hpp>

namespace Gecode { namespace Search {

  template<class T>
  class Base : public HeapAllocated {
    template<class, class>
    friend Engine* build(Space*, const Options&);
    template<class, template<class> class>
    friend Engine* build(Space*, const Options&);
  protected:
    Engine* e;
    Base(Engine* e = NULL);
  public:
    virtual T* next(void);
    virtual Statistics statistics(void) const;
    virtual bool stopped(void) const;
    virtual ~Base(void);
  private:
    Base(const Base&);
    Base& operator =(const Base&);
  };

}}

#include <gecode/search/base.hpp>

namespace Gecode { namespace Search {

  template<class T, class E>
  Engine* build(Space* s, const Options& opt);
  template<class T, template<class> class E>
  Engine* build(Space* s, const Options& opt);

  class GECODE_SEARCH_EXPORT Builder : public HeapAllocated {
  protected:
    Options opt;
    const bool b;
  public:
    Builder(const Options& opt, bool best);
    Options& options(void);
    const Options& options(void) const;
    bool best(void) const;
    virtual Engine* operator() (Space* s) const = 0;
    virtual ~Builder(void);
  };

}}

#include <gecode/search/build.hpp>

namespace Gecode {

  typedef Search::Builder* SEB;

}

#include <gecode/search/traits.hpp>

namespace Gecode {

  class SEBs : public PrimArgArray<SEB> {
  public:


    SEBs(void);
    explicit SEBs(int n);
    SEBs(const std::vector<SEB>& x);
    template<class InputIterator>
    SEBs(InputIterator first, InputIterator last);
    SEBs(const PrimArgArray<SEB>& a);
    GECODE_SEARCH_EXPORT
    SEBs(int n, SEB b0, ...);
  };

}

#include <gecode/search/sebs.hpp>

namespace Gecode {

  template<class T>
  class DFS : public Search::Base<T> {
  public:
    DFS(T* s, const Search::Options& o=Search::Options::def);
    static const bool best = false;
  };

  template<class T>
  T* dfs(T* s, const Search::Options& o=Search::Options::def);

  template<class T>
  SEB dfs(const Search::Options& o=Search::Options::def);

}

#include <gecode/search/dfs.hpp>

namespace Gecode {

  template<class T>
  class BAB : public Search::Base<T> {
  public:
    BAB(T* s, const Search::Options& o=Search::Options::def);
    static const bool best = true;
  };

  template<class T>
  T* bab(T* s, const Search::Options& o=Search::Options::def);

  template<class T>
  SEB bab(const Search::Options& o=Search::Options::def);

}

#include <gecode/search/bab.hpp>

namespace Gecode {

  template<class T>
  class LDS : public Search::Base<T> {
  public:
    LDS(T* s, const Search::Options& o=Search::Options::def);
    static const bool best = false;
  };

  template<class T>
  T* lds(T* s, const Search::Options& o=Search::Options::def);

  template<class T>
  SEB lds(const Search::Options& o=Search::Options::def);

}

#include <gecode/search/lds.hpp>

namespace Gecode {

  template<class T, template<class> class E = DFS>
  class RBS : public Search::Base<T> {
    using Search::Base<T>::e;
  public:
    RBS(T* s, const Search::Options& o);
    static const bool best = E<T>::best;
  };

  template<class T, template<class> class E>
  T* rbs(T* s, const Search::Options& o);

  template<class T, template<class> class E>
  SEB rbs(const Search::Options& o);

}

#include <gecode/search/rbs.hpp>

namespace Gecode { namespace Search { namespace Meta {

  template<class T, template<class> class E>
  Engine* sequential(T* master, const Search::Statistics& stat, Options& opt);

  template<class T, template<class> class E>
  Engine* sequential(T* master, SEBs& sebs,
                     const Search::Statistics& stat, Options& opt, bool best);

#ifdef GECODE_HAS_THREADS

  template<class T, template<class> class E>
  Engine* parallel(T* master, const Search::Statistics& stat, Options& opt);

  template<class T, template<class> class E>
  Engine* parallel(T* master, SEBs& sebs,
                   const Search::Statistics& stat, Options& opt, bool best);

#endif

}}}

namespace Gecode {

  template<class T, template<class> class E = DFS>
  class PBS : public Search::Base<T> {
    using Search::Base<T>::e;
  protected:
    void build(T* s, SEBs& sebs, const Search::Options& o);
  public:
    PBS(T* s, const Search::Options& o=Search::Options::def);
    PBS(T* s, SEBs& sebs, const Search::Options& o=Search::Options::def);
    PBS(T* s, SEB seb0, SEB seb1,
        const Search::Options& o=Search::Options::def);
    PBS(T* s, SEB seb0, SEB seb1, SEB seb2,
        const Search::Options& o=Search::Options::def);
    PBS(T* s, SEB seb0, SEB seb1, SEB seb2, SEB seb3,
        const Search::Options& o=Search::Options::def);
    static const bool best = E<T>::best;
  };

  template<class T, template<class> class E>
  T* pbs(T* s, const Search::Options& o=Search::Options::def);

  template<class T>
  SEB pbs(const Search::Options& o=Search::Options::def);

}

#include <gecode/search/pbs.hpp>

#endif

// STATISTICS: search-other