bin-packing.hh

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2010
 *
 *  Last modified:
 *     $Date: 2010-10-06 23:20:35 +0200 (Wed, 06 Oct 2010) $ by $Author: schulte $
 *     $Revision: 11468 $
 *
 *  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
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 *  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:
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#ifndef __GECODE_INT_BIN_PACKING_HH__
#define __GECODE_INT_BIN_PACKING_HH__

#include <gecode/int.hh>

namespace Gecode { namespace Int { namespace BinPacking {

  class Item : public DerivedView<IntView> {
  protected:
    using DerivedView<IntView>::x;
    int s;
  public:
    Item(void);
    Item(IntView b, int s);

    IntView bin(void) const;
    void bin(IntView b);
    int size(void) const;
    void size(int s);

    void update(Space& home, bool share, Item& i);
  };

  bool same(const Item& i, const Item& j);
  bool before(const Item& i, const Item& j);

  bool operator <(const Item& i, const Item& j);


  class SizeSet {
  protected:
    int n;
    int t;
    int* s;
  public:
    SizeSet(void);
    SizeSet(Region& region, int n_max);
    void add(int s);
    int card(void) const;
    int total(void) const;
    int operator [](int i) const;
  };

  class SizeSetMinusOne : public SizeSet {
  protected:
    int p;
  public:
    SizeSetMinusOne(void);
    SizeSetMinusOne(Region& region, int n);
    void minus(int s);
    int card(void) const;
    int total(void) const;
    int operator [](int i) const;
  };


  class Pack : public Propagator {
  protected:
    ViewArray<OffsetView> l;
    ViewArray<Item> bs;
    int t;
    Pack(Home home, ViewArray<OffsetView>& l, ViewArray<Item>& bs);
    Pack(Space& home, bool share, Pack& p);
  public:
    GECODE_INT_EXPORT 
    static ExecStatus post(Home home, 
                           ViewArray<OffsetView>& l, ViewArray<Item>& bs);
    template<class SizeSet>
    bool nosum(const SizeSet& s, int a, int b, int& ap, int& bp);
    template<class SizeSet>
    bool nosum(const SizeSet& s, int a, int b);
    GECODE_INT_EXPORT 
    virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
    GECODE_INT_EXPORT 
    virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
    GECODE_INT_EXPORT 
    virtual Actor* copy(Space& home, bool share);
    virtual size_t dispose(Space& home);
  };

}}}

#include <gecode/int/bin-packing/propagate.hpp>

#endif

// STATISTICS: int-prop