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rnd.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  * Mikael Lagerkvist <lagerkvist@gecode.org>
6  *
7  * Copyright:
8  * Christian Schulte, 2008
9  * Mikael Lagerkvist, 2008
10  *
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35 
36 #include <gecode/kernel.hh>
37 
38 namespace Gecode {
39 
40  Support::Mutex Rnd::IMP::m;
41 
43  Rnd::IMP::IMP(unsigned int s)
44  : rg(s) {}
45 
46  Rnd::IMP::~IMP(void) {}
47 
48  forceinline void
49  Rnd::_seed(unsigned int s) {
50  if (object() == NULL) {
51  object(new IMP(s));
52  } else {
53  static_cast<IMP*>(object())->seed(s);
54  }
55  }
56 
57  Rnd::Rnd(void) {}
58  Rnd::Rnd(unsigned int s) {
59  object(new IMP(s));
60  }
61  Rnd::Rnd(const Rnd& r)
62  : SharedHandle(r) {}
63  Rnd&
64  Rnd::operator =(const Rnd& r) {
65  (void) SharedHandle::operator =(r);
66  return *this;
67  }
68  Rnd::~Rnd(void) {}
69 
70  void
71  Rnd::seed(unsigned int s) {
72  _seed(s);
73  }
74  void
75  Rnd::time(void) {
76  _seed(static_cast<unsigned int>(::time(NULL)));
77  }
78  void
79  Rnd::hw(void) {
80  _seed(Support::hwrnd());
81  }
82 }
83 
84 // STATISTICS: kernel-other
Rnd(void)
Default constructor that does not initialize the generator.
Definition: rnd.cpp:57
~Rnd(void)
Destructor.
Definition: rnd.cpp:68
SharedHandle::Object * object(void) const
Access to the shared object.
Rnd & operator=(const Rnd &r)
Assignment operator.
Definition: rnd.cpp:64
unsigned int hwrnd(void)
Return hardware generated random number.
Definition: hw-rnd.cpp:59
unsigned int seed(void) const
Return current seed.
Definition: rnd.hpp:120
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:767
Random number generator.
Definition: rnd.hpp:42
void hw(void)
Set current seed to hardware-based random number (initializes if needed)
Definition: rnd.cpp:79
#define forceinline
Definition: config.hpp:185
The shared handle.
void time(void)
Set current seed based on time (initializes if needed)
Definition: rnd.cpp:75