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restart.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  * Last modified:
10  * $Date: 2009-05-12 22:21:02 +1000 (Tue, 12 May 2009) $ by $Author: schulte $
11  * $Revision: 9063 $
12  *
13  * This file is part of Gecode, the generic constraint
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15  * http://www.gecode.org
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37 
38 #ifndef __GECODE_SEARCH_SEQUENTIAL_RESTART_HH__
39 #define __GECODE_SEARCH_SEQUENTIAL_RESTART_HH__
40 
42 
43 namespace Gecode { namespace Search { namespace Sequential {
44 
46  class Restart : public DFS {
47  protected:
52  public:
54  Restart(Space* s, size_t sz, const Search::Options& o);
56  Space* next(void);
58  ~Restart(void);
59  };
60 
62  Restart::Restart(Space* s, size_t sz, const Search::Options& o) :
63  DFS(s,sz,o),
64  root(s->status() == SS_FAILED ? NULL : s->clone()), best(NULL) {}
65 
67  Restart::next(void) {
68  if (best != NULL) {
69  root->constrain(*best);
70  root = reset(root);
71  }
72  if (root == NULL)
73  return NULL;
74  delete best;
75  best = DFS::next();
76  return (best != NULL) ? best->clone() : NULL;
77  }
78 
81  delete best;
82  delete root;
83  }
84 
85 }}}
86 
87 #endif
88 
89 // STATISTICS: search-sequential