element.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, 2004
 *     Guido Tack, 2004
 *
 *  Last modified:
 *     $Date: 2009-02-26 23:09:33 +0100 (Thu, 26 Feb 2009) $ by $Author: tack $
 *     $Revision: 8305 $
 *
 *  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
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 */

#ifndef __GECODE_INT_ELEMENT_HH__
#define __GECODE_INT_ELEMENT_HH__

#include <gecode/int.hh>
#include <gecode/int/rel.hh>

namespace Gecode { namespace Int { namespace Element {

  /*
   * Element constraint for array of integers
   *
   */

  typedef SharedArray<int> IntSharedArray;

  template <class V0, class V1, class Idx, class Val>
  class Int : public Propagator {
  protected:
    class IdxVal  {
    public:
      Idx idx_next; 
      Idx val_next; 
      Idx idx; 
      Val val; 

      void mark(void);
      bool marked(void) const;
    };
    class IterIdx {
    private:
      IdxVal* iv; 
      Idx i; 
    public:
      IterIdx(IdxVal* iv);
      bool operator ()(void) const;
      void operator ++(void);
      Idx val(void) const;
    };
    class IterVal {
    private:
      IdxVal* iv; 
      Idx i; 
    public:
      IterVal(IdxVal* iv);
      bool operator ()(void) const;
      void operator ++(void);
      Val val(void) const;
    };
    class ByVal {
    protected:
      const IdxVal* iv; 
    public:
      ByVal(const IdxVal* iv);
      bool operator ()(Idx& i, Idx& j);
    };

    V0 x0;
    V1 x1;
    IntSharedArray c;
    IdxVal* iv;
    Int(Space& home, bool shared, Int& p);
    Int(Space& home, IntSharedArray& i, V0 x0, V1 x1);
  public:
    virtual Actor* copy(Space& home, bool share);
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    static  ExecStatus post(Space& home, IntSharedArray& i, V0 x0, V1 x1);
    virtual size_t dispose(Space& home);
  };

  template <class V0, class V1>
  ExecStatus post_int(Space& home, IntSharedArray& c, V0 x0, V1 x1);


  template <class ViewB> class IdxView;

  template<class View>
  class ViewToVarArg {};

  template <class View>
  class IdxViewArray {
  private:
    IdxView<View>* xs;
    int n;
  public:
    IdxViewArray(void);
    IdxViewArray(const IdxViewArray<View>&);
    IdxViewArray(Space& home, const typename ViewToVarArg<View>::argtype& x);
    IdxViewArray(Space& home, int n);

    int size(void) const;
    void size(int n);

    IdxView<View>& operator [](int n);
    const IdxView<View>& operator [](int) const;

    void subscribe(Space& home, Propagator& p, PropCond pc, bool process=true);
    void cancel(Space& home, Propagator& p, PropCond pc);

    void update(Space& home, bool share, IdxViewArray<View>& x);
  };

  template <class VA, class VB, class VC, PropCond pc_ac>
  class View : public Propagator {
  protected:
    IdxViewArray<VA> iv;
    VB x0;
    VC x1;
    View(Space& home, bool share, View& p);
    View(Space& home, IdxViewArray<VA>& iv, VB x0, VC x1);
  public:
    // Cost function (defined as low linear)
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    virtual size_t dispose(Space& home);
  };


  template <class VA, class VB, class VC>
  class ViewBnd : public View<VA,VB,VC,PC_INT_BND> {
  protected:
    using View<VA,VB,VC,PC_INT_BND>::iv;
    using View<VA,VB,VC,PC_INT_BND>::x0;
    using View<VA,VB,VC,PC_INT_BND>::x1;

    ViewBnd(Space& home, bool share, ViewBnd& p);
    ViewBnd(Space& home, IdxViewArray<VA>& iv, VB x0, VC x1);
  public:
    virtual Actor* copy(Space& home, bool share);
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    static  ExecStatus post(Space& home, IdxViewArray<VA>& iv, VB x0, VC x1);
  };

  template <class VA, class VB, class VC>
  class ViewDom : public View<VA,VB,VC,PC_INT_DOM> {
  protected:
    using View<VA,VB,VC,PC_INT_DOM>::iv;
    using View<VA,VB,VC,PC_INT_DOM>::x0;
    using View<VA,VB,VC,PC_INT_DOM>::x1;

    ViewDom(Space& home, bool share, ViewDom& p);
    ViewDom(Space& home, IdxViewArray<VA>& iv, VB x0, VC x1);
  public:
    virtual Actor* copy(Space& home, bool share);
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    static  ExecStatus post(Space& home, IdxViewArray<VA>& iv,
                            VB x0, VC x1);
  };

}}}

#include <gecode/int/element/int.hpp>
#include <gecode/int/element/view.hpp>

#endif


// STATISTICS: int-prop