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action.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
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9  * Last modified:
10  * $Date: 2017-02-28 00:23:09 +0100 (Tue, 28 Feb 2017) $ by $Author: schulte $
11  * $Revision: 15510 $
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37 
38 #include <gecode/kernel.hh>
39 
40 namespace Gecode {
41 
42  const Action Action::def;
43 
45  : storage(a.storage) {
46  if (storage != NULL) {
47  acquire();
48  storage->use_cnt++;
49  release();
50  }
51  }
52 
53  Action&
55  if (storage != a.storage) {
56  if (storage != NULL) {
57  bool done;
58  acquire();
59  done = (--storage->use_cnt == 0);
60  release();
61  if (done)
62  delete storage;
63  }
64  storage = a.storage;
65  if (storage != NULL) {
66  acquire();
67  storage->use_cnt++;
68  release();
69  }
70  }
71  return *this;
72  }
73 
75  if (storage == NULL)
76  return;
77  bool done;
78  acquire();
79  done = (--storage->use_cnt == 0);
80  release();
81  if (done)
82  delete storage;
83  }
84 
85  void
87  const_cast<Action&>(a).acquire();
88  storage = a.storage;
89  storage->use_cnt++;
90  const_cast<Action&>(a).release();
91  }
92 
93  void
94  Action::decay(Space&, double d) {
95  if ((d < 0.0) || (d > 1.0))
96  throw IllegalDecay("Action");
97  acquire();
98  storage->invd = 1.0 / d;
99  release();
100  }
101 
102  double
103  Action::decay(const Space&) const {
104  double d;
105  const_cast<Action*>(this)->acquire();
106  d = 1.0 / storage->invd;
107  const_cast<Action*>(this)->release();
108  return d;
109  }
110 
111 }
112 
113 // STATISTICS: kernel-branch
Action(void)
Construct as not yet intialized.
Definition: action.hpp:329
~Action(void)
Destructor.
Definition: action.cpp:74
void acquire(void)
Acquire mutex.
Definition: action.hpp:319
void release(void)
Release mutex.
Definition: action.hpp:323
Computation spaces.
Definition: core.hpp:1748
Gecode::IntSet d(v, 7)
struct Gecode::@579::NNF::@61::@63 a
For atomic nodes.
void update(int i)
Update action value at position i.
Definition: action.hpp:306
unsigned int use_cnt
How many references exist for this object.
Definition: action.hpp:56
void decay(Space &home, double d)
Set decay factor to d.
Definition: action.cpp:94
double invd
Inverse decay factor.
Definition: action.hpp:62
Storage * storage
Pointer to storage object.
Definition: action.hpp:74
Action & operator=(const Action &a)
Assignment operator.
Definition: action.cpp:54
static const Action def
Default (empty) action information.
Definition: action.hpp:109
Gecode toplevel namespace
Class for action management.
Definition: action.hpp:46
Exception: illegal decay factor
Definition: exception.hpp:111