A Discrete-Event Network Simulator
API
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rng-stream.h
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1//
2// Copyright (C) 2001 Pierre L'Ecuyer (lecuyer@iro.umontreal.ca)
3//
4// SPDX-License-Identifier: GPL-2.0-only
5//
6// Modified for ns-3 by: Rajib Bhattacharjea<raj.b@gatech.edu>
7
8#ifndef RNGSTREAM_H
9#define RNGSTREAM_H
10#include <stdint.h>
11#include <string>
12
13/**
14 * \file
15 * \ingroup rngimpl
16 * ns3::RngStream declaration.
17 */
18
19namespace ns3
20{
21
22/**
23 * \ingroup randomvariable
24 * \defgroup rngimpl RNG Implementation
25 */
26
27/**
28 * \ingroup rngimpl
29 *
30 * \brief Combined Multiple-Recursive Generator MRG32k3a
31 *
32 * This class is the combined multiple-recursive random number
33 * generator called MRG32k3a. The ns3::RandomVariableBase class
34 * holds a static instance of this class. The details of this
35 * class are explained in:
36 * http://www.iro.umontreal.ca/~lecuyer/myftp/papers/streams00.pdf
37 */
39{
40 public:
41 /**
42 * Construct from explicit seed, stream and substream values.
43 *
44 * \param [in] seed The starting seed.
45 * \param [in] stream The stream number.
46 * \param [in] substream The sub-stream number.
47 */
48 RngStream(uint32_t seed, uint64_t stream, uint64_t substream);
49 /**
50 * Copy constructor.
51 *
52 * \param [in] r The RngStream to copy.
53 */
54 RngStream(const RngStream& r);
55 /**
56 * Generate the next random number for this stream.
57 * Uniformly distributed between 0 and 1.
58 *
59 * \returns The next random.
60 */
61 double RandU01();
62
63 private:
64 /**
65 * Advance \pname{state} of the RNG by leaps and bounds.
66 *
67 * \param [in] nth The stream or substream index.
68 * \param [in] by The log2 base of \pname{nth}.
69 * \param [in] state The state vector to advance.
70 */
71 void AdvanceNthBy(uint64_t nth, int by, double state[6]);
72
73 /** The RNG state vector. */
74 double m_currentState[6];
75};
76
77} // namespace ns3
78
79#endif
Combined Multiple-Recursive Generator MRG32k3a.
Definition rng-stream.h:39
RngStream(uint32_t seed, uint64_t stream, uint64_t substream)
Construct from explicit seed, stream and substream values.
double m_currentState[6]
The RNG state vector.
Definition rng-stream.h:74
void AdvanceNthBy(uint64_t nth, int by, double state[6])
Advance state of the RNG by leaps and bounds.
double RandU01()
Generate the next random number for this stream.
Every class exported by the ns3 library is enclosed in the ns3 namespace.