1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
* Main authors:
* Christian Schulte <schulte@gecode.org>
*
* Copyright:
* Christian Schulte, 2008
*
* This file is part of Gecode, the generic constraint
* development environment:
* http://www.gecode.org
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include <ctime>
namespace Gecode {
/**
* \brief Random number generator
* \ingroup TaskModel
*/
class Rnd : public SharedHandle {
private:
/// Implementation of generator
class IMP : public SharedHandle::Object {
protected:
/// Mutex for locking
GECODE_KERNEL_EXPORT static Support::Mutex m;
/// The actual generator
Support::RandomGenerator rg;
public:
/// Initialize generator with seed \a s
IMP(unsigned int s);
/// Return seed
unsigned int seed(void) const;
/// Set seed to \a s
void seed(unsigned int s);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
unsigned int operator ()(unsigned int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
int operator ()(int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
unsigned long long int operator ()(unsigned long long int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
long long int operator ()(long long int n);
/// Delete implemenentation
virtual ~IMP(void);
};
/// Set the current seed to \a s (initializes if needed)
void _seed(unsigned int s);
public:
/// Default constructor that does not initialize the generator
GECODE_KERNEL_EXPORT
Rnd(void);
/// Initialize from generator \a r
GECODE_KERNEL_EXPORT
Rnd(const Rnd& r);
/// Assignment operator
GECODE_KERNEL_EXPORT
Rnd& operator =(const Rnd& r);
/// Destructor
GECODE_KERNEL_EXPORT
~Rnd(void);
/// Initialize with seed \a s
GECODE_KERNEL_EXPORT
Rnd(unsigned int s);
/// Set the current seed to \a s (initializes if needed)
GECODE_KERNEL_EXPORT
void seed(unsigned int s);
/// Set current seed based on time (initializes if needed)
GECODE_KERNEL_EXPORT
void time(void);
/// Set current seed to hardware-based random number (initializes if needed)
GECODE_KERNEL_EXPORT
void hw(void);
/// Return current seed
unsigned int seed(void) const;
/// Returns a random integer from the interval \f$[0\ldots n)\f$
unsigned int operator ()(unsigned int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
int operator ()(int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
unsigned long long int operator ()(unsigned long long int n);
/// Returns a random integer from the interval \f$[0\ldots n)\f$
long long int operator ()(long long int n);
};
forceinline unsigned int
Rnd::IMP::seed(void) const {
unsigned int s;
const_cast<Rnd::IMP&>(*this).m.acquire();
s = rg.seed();
const_cast<Rnd::IMP&>(*this).m.release();
return s;
}
forceinline void
Rnd::IMP::seed(unsigned int s) {
m.acquire();
rg.seed(s);
m.release();
}
forceinline unsigned int
Rnd::IMP::operator ()(unsigned int n) {
unsigned int r;
m.acquire();
r=rg(n);
m.release();
return r;
}
forceinline int
Rnd::IMP::operator ()(int n) {
int r;
m.acquire();
r=rg(n);
m.release();
return r;
}
forceinline unsigned long long int
Rnd::IMP::operator ()(unsigned long long int n) {
unsigned long long int r;
m.acquire();
r=rg(n);
m.release();
return r;
}
forceinline long long int
Rnd::IMP::operator ()(long long int n) {
long long int r;
m.acquire();
r=rg(n);
m.release();
return r;
}
forceinline unsigned int
Rnd::seed(void) const {
const IMP* i = static_cast<const IMP*>(object());
return i->seed();
}
forceinline unsigned int
Rnd::operator ()(unsigned int n) {
IMP* i = static_cast<IMP*>(object());
return (*i)(n);
}
forceinline int
Rnd::operator ()(int n) {
IMP* i = static_cast<IMP*>(object());
return (*i)(n);
}
forceinline unsigned long long int
Rnd::operator ()(unsigned long long int n) {
IMP* i = static_cast<IMP*>(object());
return (*i)(n);
}
forceinline long long int
Rnd::operator ()(long long int n) {
IMP* i = static_cast<IMP*>(object());
return (*i)(n);
}
}
// STATISTICS: kernel-other
|
