Generated on Thu Apr 5 2018 19:44:19 for Gecode by doxygen 1.8.13
bab.hpp
Go to the documentation of this file.
1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Contributing authors:
7  * Guido Tack <tack@gecode.org>
8  *
9  * Copyright:
10  * Christian Schulte, 2004
11  * Guido Tack, 2004
12  *
13  * Last modified:
14  * $Date$ by $Author$
15  * $Revision$
16  *
17  * This file is part of Gecode, the generic constraint
18  * development environment:
19  * http://www.gecode.org
20  *
21  * Permission is hereby granted, free of charge, to any person obtaining
22  * a copy of this software and associated documentation files (the
23  * "Software"), to deal in the Software without restriction, including
24  * without limitation the rights to use, copy, modify, merge, publish,
25  * distribute, sublicense, and/or sell copies of the Software, and to
26  * permit persons to whom the Software is furnished to do so, subject to
27  * the following conditions:
28  *
29  * The above copyright notice and this permission notice shall be
30  * included in all copies or substantial portions of the Software.
31  *
32  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
34  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
35  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
36  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
37  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
38  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
39  *
40  */
41 
42 namespace Gecode { namespace Search {
43 
45  GECODE_SEARCH_EXPORT Engine*
46  babengine(Space* s, const Options& o);
47 
49  template<class T>
50  class BabBuilder : public Builder {
51  using Builder::opt;
52  public:
54  BabBuilder(const Options& opt);
56  virtual Engine* operator() (Space* s) const;
57  };
58 
59  template<class T>
60  inline
62  : Builder(opt,BAB<T>::best) {}
63 
64  template<class T>
65  Engine*
67  return build<T,BAB>(s,opt);
68  }
69 
70 }}
71 
72 namespace Gecode {
73 
74  template<class T>
75  inline
76  BAB<T>::BAB(T* s, const Search::Options& o)
77  : Search::Base<T>(Search::babengine(s,o)) {}
78 
79  template<class T>
80  inline T*
81  bab(T* s, const Search::Options& o) {
82  BAB<T> b(s,o);
83  T* l = NULL;
84  while (T* n = b.next()) {
85  delete l; l = n;
86  }
87  return l;
88  }
89 
90  template<class T>
91  SEB
92  bab(const Search::Options& o) {
93  return new Search::BabBuilder<T>(o);
94  }
95 
96 }
97 
98 // STATISTICS: search-other
Search engine implementation interface
Definition: search.hh:901
NNF * l
Left subtree.
Definition: bool-expr.cpp:244
#define GECODE_SEARCH_EXPORT
Definition: search.hh:69
Search engine options
Definition: search.hh:748
A class for building search engines.
Definition: search.hh:967
Options opt
Stored and already expanded options.
Definition: search.hh:970
A BAB engine builder.
Definition: bab.hpp:50
virtual T * next(void)
Return next solution (NULL, if none exists or search has been stopped)
Definition: base.hpp:50
Computation spaces.
Definition: core.hpp:1668
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:238
Depth-first branch-and-bound search engine.
Definition: search.hh:1073
Engine * babengine(Space *s, const Options &o)
Create branch and bound engine.
Definition: bab.cpp:49
T * bab(T *s, const Search::Options &o)
Perform depth-first branch-and-bound search for subclass T of space s and options o...
Definition: bab.hpp:81
BAB(T *s, const Search::Options &o=Search::Options::def)
Initialize engine for space s and options o.
Definition: bab.hpp:76
struct Gecode::@585::NNF::@62::@63 b
For binary nodes (and, or, eqv)
BabBuilder(const Options &opt)
The constructor.
Definition: bab.hpp:61
bool best(void) const
Whether engine is a best solution search engine.
Definition: build.hpp:52
virtual Engine * operator()(Space *s) const
The actual build function.
Definition: bab.hpp:66
Gecode toplevel namespace