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activity.cpp
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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, 2012
8  *
9  * Last modified:
10  * $Date: 2013-03-13 05:33:01 +0100 (Wed, 13 Mar 2013) $ by $Author: tack $
11  * $Revision: 13520 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
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37 
38 #include <gecode/kernel.hh>
39 
40 namespace Gecode {
41 
42  const Activity Activity::def;
43 
44  void
45  Activity::init(int n, double d) {
46  assert(storage == NULL);
47  storage = new Storage(n,d);
48  }
49 
51  : storage(a.storage) {
52  if (storage != NULL) {
53  acquire();
54  storage->use_cnt++;
55  release();
56  }
57  }
58 
59  Activity&
61  if (storage != a.storage) {
62  if (storage != NULL) {
63  bool done;
64  acquire();
65  done = (--storage->use_cnt == 0);
66  release();
67  if (done)
68  delete storage;
69  }
70  storage = a.storage;
71  if (storage != NULL) {
72  acquire();
73  storage->use_cnt++;
74  release();
75  }
76  }
77  return *this;
78  }
79 
81  if (storage == NULL)
82  return;
83  bool done;
84  acquire();
85  done = (--storage->use_cnt == 0);
86  release();
87  if (done)
88  delete storage;
89  }
90 
91  void
93  const_cast<Activity&>(a).acquire();
94  storage = a.storage;
95  storage->use_cnt++;
96  const_cast<Activity&>(a).release();
97  }
98 
99  void
100  Activity::decay(Space&, double d) {
101  if ((d <= 0.0) || (d > 1.0))
102  throw IllegalDecay("Activity");
103  acquire();
104  storage->d = d;
105  release();
106  }
107 
108  double
109  Activity::decay(const Space&) const {
110  double d;
111  const_cast<Activity*>(this)->acquire();
112  d = storage->d;
113  const_cast<Activity*>(this)->release();
114  return d;
115  }
116 
117 }
118 
119 // STATISTICS: kernel-branch