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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
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37 
38 #ifndef __GECODE_SEARCH_PAR_BAB_HH__
39 #define __GECODE_SEARCH_PAR_BAB_HH__
40 
42 
43 namespace Gecode { namespace Search { namespace Par {
44 
46  template<class Tracer>
47  class BAB : public Engine<Tracer> {
48  protected:
59  using Engine<Tracer>::opt;
70  class Worker : public Engine<Tracer>::Worker {
71  protected:
84  int mark;
87  public:
89  Worker(Space* s, BAB& e);
91  BAB& engine(void) const;
93  virtual void run(void);
95  void better(Space* b);
97  void find(void);
99  void reset(Space* s, unsigned int ngdl);
101  virtual ~Worker(void);
102  };
107  public:
109  Worker* worker(unsigned int i) const;
110 
112 
113  void solution(Space* s);
116 
118 
119  BAB(Space* s, const Options& o);
122  virtual Statistics statistics(void) const;
124  virtual void reset(Space* s);
126  virtual void constrain(const Space& b);
129  virtual NoGoods& nogoods(void);
131  virtual ~BAB(void);
133  };
134 
135 }}}
136 
137 #include <gecode/search/par/bab.hpp>
138 
139 #endif
140 
141 // STATISTICS: search-par
Statistics statistics(void)
Return statistics.
Definition: engine.hpp:138
Worker(void)
Initialize.
Definition: worker.hh:74
Worker ** _worker
Array of worker references.
Definition: bab.hh:104
Search engine statistics
Definition: search.hh:149
int mark
Number of entries not yet constrained to be better.
Definition: bab.hh:84
virtual void run(void)
Start execution of worker.
Definition: bab.hpp:213
Search engine options
Definition: search.hh:748
Worker * worker(unsigned int i) const
Provide access to worker i.
Definition: bab.hpp:50
Parallel depth-first search engine
Definition: engine.hh:50
Computation spaces.
Definition: core.hpp:1668
BAB & engine(void) const
Provide access to engine.
Definition: bab.hpp:45
Space * best
Best solution so far.
Definition: bab.hh:106
Gecode::IntArgs i(4, 1, 2, 3, 4)
virtual ~BAB(void)
Destructor.
Definition: bab.hpp:420
Parallel branch-and-bound engine
Definition: bab.hh:47
void better(Space *b)
Accept better solution b.
Definition: bab.hpp:110
struct Gecode::@585::NNF::@62::@63 b
For binary nodes (and, or, eqv)
virtual ~Worker(void)
Destructor.
Definition: bab.hpp:415
No-goods recorded from restarts.
Definition: core.hpp:1514
Space * best
Best solution found so far.
Definition: bab.hh:86
void find(void)
Try to find some work.
Definition: bab.hpp:152
virtual void constrain(const Space &b)
Constrain future solutions to be better than b.
Definition: bab.hpp:191
NoGoods & nogoods(void)
Return no-goods.
Definition: engine.hpp:293
Gecode toplevel namespace
BAB(Space *s, const Options &o)
Initialize for space s with options o.
Definition: bab.hpp:85
Parallel branch-and-bound search worker
Definition: bab.hh:70
void solution(Space *s)
Report solution s.
Definition: bab.hpp:121
void reset(void)
Reset.
Definition: statistics.hpp:43