view.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Patrick Pekczynski <pekczynski@ps.uni-sb.de>
 *
 *  Contributing authors:
 *     Christian Schulte <schulte@gecode.org>
 *     Guido Tack <tack@gecode.org>
 *
 *  Copyright:
 *     Patrick Pekczynski, 2004
 *     Christian Schulte, 2009
 *     Guido Tack, 2009
 *
 *  This file is part of Gecode, the generic constrain
 *  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.
 */

namespace Gecode { namespace Int { namespace GCC {

  template<class T>
  forceinline bool
  lookupValue(T& a, int v, int& i) {
    int l = 0;
    int r = a.size() - 1;

    while (l <= r) {
      int m = l + (r - l) / 2;
      if (v == a[m].card()) {
        i=m; return true;
      } else if (l == r) {
        return false;
      } else if (v < a[m].card()) {
        r=m-1;
      } else {
        l=m+1;
      }
    }
    return false;
  }

  class CardConst {
  private:
    int _min;
    int _max;
    int _card;
    int _counter;
  public:
    static const bool propagate = false;



    CardConst(void);
    void init(Space& home, int min, int max, int c);



    int min(void) const;
    int max(void) const;
    int card(void) const;
    int counter(void) const;

    bool assigned(void) const;

    void counter(int n);
    ModEvent inc(void);
    ModEvent lq(Space& home, int n);
    ModEvent gq(Space& home, int n);
    ModEvent eq(Space& home, int n);

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

    void update(Space& home, CardConst& x);

    IntView base(void) const;
  };

  class CardView : public DerivedView<IntView> {
  protected:
    using DerivedView<IntView>::x;
    int _card;
    int _counter;
  public:
    static const bool propagate = true;


    CardView(void);
    void init(const IntView& y, int c);
    void init(Space& home, const IntSet& s, int c);



    int min(void) const;
    int max(void) const;
    unsigned int size(void) const;
    int counter(void) const;
    int card(void) const;

    void counter(int n);
    ModEvent inc(void);
    ModEvent lq(Space& home, int n);
    ModEvent gq(Space& home, int n);
    ModEvent eq(Space& home, int n);



    template<class I>
    ModEvent narrow_v(Space& home, I& i, bool depends=true);
    template<class I>
    ModEvent inter_v(Space& home, I& i, bool depends=true);
    template<class I>
    ModEvent minus_v(Space& home, I& i, bool depends=true);

    void update(Space& home, CardView& x);
  };



  /*
   * Constant cardinality view
   *
   */
  forceinline
  CardConst::CardConst(void) {}
  forceinline void
  CardConst::init(Space&, int min, int max, int c) {
    _min = min; _max=max; _card = c; _counter = 0;
  }

  forceinline int
  CardConst::min(void) const {
    return _min;
  }
  forceinline int
  CardConst::max(void) const {
    return _max;
  }
  forceinline int
  CardConst::card(void) const {
    return _card;
  }
  forceinline int
  CardConst::counter(void) const {
    return _counter;
  }
  forceinline bool
  CardConst::assigned(void) const {
    return _min==_max;
  }


  forceinline void
  CardConst::counter(int n) {
    _counter = n;
  }
  forceinline ModEvent
  CardConst::inc(void) {
    if (++_counter > _max)
      return ME_INT_FAILED;
    return ME_INT_NONE;
  }
  forceinline ModEvent
  CardConst::lq(Space&, int n) {
    if (_min > n)
      return ME_INT_FAILED;
    return ME_INT_NONE;
  }
  forceinline ModEvent
  CardConst::gq(Space&, int n) {
    if (_max < n)
      return ME_INT_FAILED;
    return ME_INT_NONE;
  }
  forceinline ModEvent
  CardConst::eq(Space&, int n) {
    if ((_min > n) || (_max < n))
      return ME_INT_FAILED;
    return ME_INT_NONE;
  }

  forceinline void
  CardConst::subscribe(Space&, Propagator&, PropCond, bool) {}
  forceinline void
  CardConst::cancel(Space&, Propagator&, PropCond) {}
  forceinline void
  CardConst::reschedule(Space&, Propagator&, PropCond) {}

  forceinline void
  CardConst::update(Space&, CardConst& x) {
    _min=x._min; _max=x._max; _card=x._card; _counter=x._counter;
  }

  forceinline IntView
  CardConst::base(void) const {
    GECODE_NEVER;
    return IntView();
  }



  /*
   * Cardinality integer view
   *
   */
  forceinline
  CardView::CardView(void) {}
  forceinline void
  CardView::init(const IntView& y, int c) {
    x = y; _card = c; _counter = 0;
  }
  forceinline void
  CardView::init(Space& home, const IntSet& s, int c) {
    x = IntVar(home,s); _card = c; _counter = 0;
  }

  forceinline int
  CardView::counter(void) const {
    return _counter;
  }
  forceinline int
  CardView::card(void) const {
    return _card;
  }
  forceinline int
  CardView::min(void) const {
    return x.min();
  }
  forceinline int
  CardView::max(void) const {
    return x.max();
  }
  forceinline unsigned int
  CardView::size(void) const {
    return x.size();
  }

  forceinline void
  CardView::counter(int n) {
    _counter = n;
  }
  forceinline ModEvent
  CardView::inc(void) {
    if (++_counter > this->max())
      return ME_INT_FAILED;
    return ME_GEN_NONE;
  }
  forceinline ModEvent
  CardView::lq(Space& home, int n) {
    return x.lq(home,n);
  }
  forceinline ModEvent
  CardView::gq(Space& home, int n) {
    return x.gq(home,n);
  }
  forceinline ModEvent
  CardView::eq(Space& home, int n) {
    return x.eq(home,n);
  }

  template<class I>
  forceinline ModEvent
  CardView::narrow_v(Space& home, I& i, bool depends) {
    return x.narrow_v(home,i,depends);
  }
  template<class I>
  forceinline ModEvent
  CardView::inter_v(Space& home, I& i, bool depends) {
    return x.inter_v(home,i,depends);
  }
  template<class I>
  forceinline ModEvent
  CardView::minus_v(Space& home, I& i, bool depends) {
    return x.minus_v(home,i,depends);
  }

  forceinline void
  CardView::update(Space& home, CardView& y) {
    x.update(home,y.x);
    _card = y._card; _counter = y._counter;
  }

}


  template<>
  class ViewRanges<GCC::CardView>
    : public Gecode::Int::ViewRanges<IntView> {
  public:
    ViewRanges(void);
    ViewRanges(const GCC::CardView& x);
    void init(const GCC::CardView& x);
  };

  forceinline
  ViewRanges<GCC::CardView>::ViewRanges(void) :
    Gecode::Int::ViewRanges<IntView>()  {}

  forceinline
  ViewRanges<GCC::CardView>::ViewRanges (const GCC::CardView& x)
    : Gecode::Int::ViewRanges<IntView>(x.base())  {}

  forceinline void
  ViewRanges<GCC::CardView>::init(const GCC::CardView& x) {
    Gecode::Int::ViewRanges<IntView> xi(x.base());
  }

}}



// STATISTICS: int-prop