Generated on Tue Feb 11 2025 17:33:26 for Gecode by doxygen 1.12.0
rnd.hpp
Go to the documentation of this file.
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, 2008
8 *
9 * This file is part of Gecode, the generic constraint
10 * development environment:
11 * http://www.gecode.org
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining
14 * a copy of this software and associated documentation files (the
15 * "Software"), to deal in the Software without restriction, including
16 * without limitation the rights to use, copy, modify, merge, publish,
17 * distribute, sublicense, and/or sell copies of the Software, and to
18 * permit persons to whom the Software is furnished to do so, subject to
19 * the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be
22 * included in all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 *
32 */
33
34#include <ctime>
35
36namespace Gecode {
37
42 class Rnd : public SharedHandle {
43 private:
45 class IMP : public SharedHandle::Object {
46 protected:
51 public:
53 IMP(unsigned int s);
55 unsigned int seed(void) const;
57 void seed(unsigned int s);
59 unsigned int operator ()(unsigned int n);
61 virtual ~IMP(void);
62 };
64 void _seed(unsigned int s);
65 public:
68 Rnd(void);
71 Rnd(const Rnd& r);
74 Rnd& operator =(const Rnd& r);
77 ~Rnd(void);
80 Rnd(unsigned int s);
83 void seed(unsigned int s);
86 void time(void);
89 void hw(void);
91 unsigned int seed(void) const;
93 unsigned int operator ()(unsigned int n);
94 };
95
96 forceinline unsigned int
97 Rnd::IMP::seed(void) const {
98 unsigned int s;
99 const_cast<Rnd::IMP&>(*this).m.acquire();
100 s = rg.seed();
101 const_cast<Rnd::IMP&>(*this).m.release();
102 return s;
103 }
104 forceinline void
105 Rnd::IMP::seed(unsigned int s) {
106 m.acquire();
107 rg.seed(s);
108 m.release();
109 }
110 forceinline unsigned int
111 Rnd::IMP::operator ()(unsigned int n) {
112 unsigned int r;
113 m.acquire();
114 r=rg(n);
115 m.release();
116 return r;
117 }
118
119 forceinline unsigned int
120 Rnd::seed(void) const {
121 const IMP* i = static_cast<const IMP*>(object());
122 return i->seed();
123 }
124 forceinline unsigned int
125 Rnd::operator ()(unsigned int n) {
126 IMP* i = static_cast<IMP*>(object());
127 return (*i)(n);
128 }
129
130}
131
132// STATISTICS: kernel-other
int n
Number of negative literals for node type.
Random number generator.
Definition rnd.hpp:42
unsigned int seed(void) const
Return current seed.
Definition rnd.hpp:120
Rnd & operator=(const Rnd &r)
Assignment operator.
Definition rnd.cpp:64
void time(void)
Set current seed based on time (initializes if needed)
Definition rnd.cpp:75
unsigned int operator()(unsigned int n)
Return a random integer from the interval [0..n)
Definition rnd.hpp:125
~Rnd(void)
Destructor.
Definition rnd.cpp:68
Rnd(void)
Default constructor that does not initialize the generator.
Definition rnd.cpp:57
void hw(void)
Set current seed to hardware-based random number (initializes if needed)
Definition rnd.cpp:79
The shared handle.
SharedHandle::Object * object(void) const
Access to the shared object.
Template for linear congruential generators.
Definition random.hpp:46
void seed(unsigned int s)
Set the current seed to s.
Definition random.hpp:77
A mutex for mutual exclausion among several threads.
Definition thread.hpp:96
#define GECODE_KERNEL_EXPORT
Definition kernel.hh:70
Gecode toplevel namespace
Post propagator for SetVar SetOpType SetVar SetRelType r
Definition set.hh:767
#define forceinline
Definition config.hpp:187