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bab.hh
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2009
8  *
9  * This file is part of Gecode, the generic constraint
10  * development environment:
11  * http://www.gecode.org
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33 
34 #ifndef __GECODE_SEARCH_PAR_BAB_HH__
35 #define __GECODE_SEARCH_PAR_BAB_HH__
36 
38 
39 namespace Gecode { namespace Search { namespace Par {
40 
42  template<class Tracer>
43  class BAB : public Engine<Tracer> {
44  protected:
55  using Engine<Tracer>::opt;
66  class Worker : public Engine<Tracer>::Worker {
67  protected:
80  int mark;
83  public:
85  Worker(Space* s, BAB& e);
87  BAB& engine(void) const;
89  virtual void run(void);
91  void better(Space* b);
93  void find(void);
95  void reset(Space* s, unsigned int ngdl);
97  virtual ~Worker(void);
98  };
103  public:
105  Worker* worker(unsigned int i) const;
106 
108 
109  void solution(Space* s);
112 
114 
115  BAB(Space* s, const Options& o);
118  virtual Statistics statistics(void) const;
120  virtual void reset(Space* s);
122  virtual void constrain(const Space& b);
125  virtual NoGoods& nogoods(void);
127  virtual ~BAB(void);
129  };
130 
131 }}}
132 
133 #include <gecode/search/par/bab.hpp>
134 
135 #endif
136 
137 // STATISTICS: search-par
Statistics statistics(void)
Return statistics.
Definition: engine.hpp:134
Worker(void)
Initialize.
Definition: worker.hh:70
Worker ** _worker
Array of worker references.
Definition: bab.hh:100
Search engine statistics
Definition: search.hh:147
int mark
Number of entries not yet constrained to be better.
Definition: bab.hh:80
virtual void run(void)
Start execution of worker.
Definition: bab.hpp:209
Search engine options
Definition: search.hh:746
Worker * worker(unsigned int i) const
Provide access to worker i.
Definition: bab.hpp:46
Parallel depth-first search engine
Definition: engine.hh:46
Computation spaces.
Definition: core.hpp:1701
BAB & engine(void) const
Provide access to engine.
Definition: bab.hpp:41
Space * best
Best solution so far.
Definition: bab.hh:102
Gecode::IntArgs i({1, 2, 3, 4})
struct Gecode::@593::NNF::@62::@63 b
For binary nodes (and, or, eqv)
virtual ~BAB(void)
Destructor.
Definition: bab.hpp:416
Parallel branch-and-bound engine
Definition: bab.hh:43
void better(Space *b)
Accept better solution b.
Definition: bab.hpp:106
virtual ~Worker(void)
Destructor.
Definition: bab.hpp:411
No-goods recorded from restarts.
Definition: core.hpp:1547
Space * best
Best solution found so far.
Definition: bab.hh:82
void find(void)
Try to find some work.
Definition: bab.hpp:148
virtual void constrain(const Space &b)
Constrain future solutions to be better than b.
Definition: bab.hpp:187
NoGoods & nogoods(void)
Return no-goods.
Definition: engine.hpp:289
Gecode toplevel namespace
BAB(Space *s, const Options &o)
Initialize for space s with options o.
Definition: bab.hpp:81
Parallel branch-and-bound search worker
Definition: bab.hh:66
void solution(Space *s)
Report solution s.
Definition: bab.hpp:117
void reset(void)
Reset.
Definition: statistics.hpp:39