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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  *
11  * Last modified:
12  * $Date: 2016-06-19 22:08:39 +0200 (Sun, 19 Jun 2016) $ by $Author: schulte $
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39 
40 #include <gecode/kernel.hh>
41 
42 namespace Gecode {
43 
45  Rnd::IMP::IMP(unsigned int s)
46  : rg(s) {}
47 
48  Rnd::IMP::~IMP(void) {}
49 
50  SharedHandle::Object*
51  Rnd::IMP::copy(void) const {
52  return new IMP(rg.seed());
53  }
54 
55  forceinline void
56  Rnd::_seed(unsigned int s) {
57  if (object() == NULL) {
58  object(new IMP(s));
59  } else {
60  static_cast<IMP*>(object())->rg.seed(s);
61  }
62  }
63 
64  Rnd::Rnd(void) {}
65  Rnd::Rnd(unsigned int s) {
66  object(new IMP(s));
67  }
68  Rnd::Rnd(const Rnd& r)
69  : SharedHandle(r) {}
70  Rnd&
71  Rnd::operator =(const Rnd& r) {
72  (void) SharedHandle::operator =(r);
73  return *this;
74  }
75  Rnd::~Rnd(void) {}
76 
77  void
78  Rnd::seed(unsigned int s) {
79  _seed(s);
80  }
81  void
82  Rnd::time(void) {
83  _seed(static_cast<unsigned int>(::time(NULL)));
84  }
85  void
86  Rnd::hw(void) {
88  }
89 }
90 
91 // STATISTICS: kernel-other
The shared handle.
Definition: core.hpp:79
unsigned int seed(void) const
Return current seed.
Definition: rnd.hpp:97
void time(void)
Set current seed based on time (initializes if needed)
Definition: rnd.cpp:82
Rnd(void)
Default constructor that does not initialize the generator.
Definition: rnd.cpp:64
Rnd & operator=(const Rnd &r)
Assignment operator.
Definition: rnd.cpp:71
SharedHandle::Object * object(void) const
Access to the shared object.
Definition: core.hpp:3090
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition: set.hh:784
void hw(void)
Set current seed to hardware-based random number (initializes if needed)
Definition: rnd.cpp:86
#define forceinline
Definition: config.hpp:173
Gecode toplevel namespace
Random number generator.
Definition: rnd.hpp:46
~Rnd(void)
Destructor.
Definition: rnd.cpp:75
unsigned int hwrnd(void)
Return hardware generated random number.
Definition: hw-rnd.cpp:63