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bin-packing.hh
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2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2010
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9  * Last modified:
10  * $Date: 2010-10-07 08:20:35 +1100 (Thu, 07 Oct 2010) $ by $Author: schulte $
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37 
38 #ifndef __GECODE_INT_BIN_PACKING_HH__
39 #define __GECODE_INT_BIN_PACKING_HH__
40 
41 #include <gecode/int.hh>
42 
48 namespace Gecode { namespace Int { namespace BinPacking {
49 
53  class Item : public DerivedView<IntView> {
54  protected:
57  int s;
58  public:
60  Item(void);
62  Item(IntView b, int s);
63 
65  IntView bin(void) const;
67  void bin(IntView b);
69  int size(void) const;
71  void size(int s);
72 
74  void update(Space& home, bool share, Item& i);
75  };
76 
78  bool same(const Item& i, const Item& j);
80  bool before(const Item& i, const Item& j);
81 
83  bool operator <(const Item& i, const Item& j);
84 
85 
87  class SizeSet {
88  protected:
90  int n;
92  int t;
94  int* s;
95  public:
97  SizeSet(void);
99  SizeSet(Region& region, int n_max);
101  void add(int s);
103  int card(void) const;
105  int total(void) const;
107  int operator [](int i) const;
108  };
109 
111  class SizeSetMinusOne : public SizeSet {
112  protected:
114  int p;
115  public:
117  SizeSetMinusOne(void);
119  SizeSetMinusOne(Region& region, int n);
121  void minus(int s);
123  int card(void) const;
125  int total(void) const;
127  int operator [](int i) const;
128  };
129 
130 
141  class Pack : public Propagator {
142  protected:
148  int t;
152  Pack(Space& home, bool share, Pack& p);
153  public:
156  static ExecStatus post(Home home,
159  template<class SizeSet>
160  bool nosum(const SizeSet& s, int a, int b, int& ap, int& bp);
162  template<class SizeSet>
163  bool nosum(const SizeSet& s, int a, int b);
166  virtual ExecStatus propagate(Space& home, const ModEventDelta& med);
169  virtual PropCost cost(const Space& home, const ModEventDelta& med) const;
172  virtual Actor* copy(Space& home, bool share);
174  virtual size_t dispose(Space& home);
175  };
176 
177 }}}
178 
180 
181 #endif
182 
183 // STATISTICS: int-prop
184