InsecureRandomContext Class Reference

xoroshiro128++ PRNG. More...

#include <random.h>

Inheritance diagram for InsecureRandomContext:

Collaboration diagram for InsecureRandomContext:

Public Member Functions
constexpr	InsecureRandomContext (uint64_t seedval) noexcept
constexpr void	Reseed (uint64_t seedval) noexcept
constexpr uint64_t	rand64 () noexcept
Public Member Functions inherited from RandomMixin< InsecureRandomContext >
constexpr	RandomMixin () noexcept=default
RandomMixin &	operator= (const RandomMixin &)=delete
uint64_t	randbits (int bits) noexcept
	Generate a random (bits)-bit integer.
I	randrange (I range) noexcept
	Generate a random integer in the range [0..range), with range > 0.
void	fillrand (std::span< std::byte > span) noexcept
	Fill a span with random bytes.
I	rand () noexcept
	Generate a random integer in its entire (non-negative) range.
std::vector< B >	randbytes (size_t len) noexcept
	Generate random bytes.
uint32_t	rand32 () noexcept
	Generate a random 32-bit integer.
uint256	rand256 () noexcept
	generate a random uint256.
bool	randbool () noexcept
	Generate a random boolean.
Tp	rand_uniform_delay (const Tp &time, typename Tp::duration range) noexcept
	Return the time point advanced by a uniform random duration.
Chrono::duration	rand_uniform_duration (typename Chrono::duration range) noexcept
	Generate a uniform random duration in the range from 0 (inclusive) to range (exclusive).
std::chrono::microseconds	rand_exp_duration (std::chrono::microseconds mean) noexcept
	Return a duration sampled from an exponential distribution (https://en.wikipedia.org/wiki/Exponential_distribution).
uint64_t	operator() () noexcept

Static Private Member Functions
static constexpr uint64_t	SplitMix64 (uint64_t &seedval) noexcept

Private Attributes
uint64_t	m_s0
uint64_t	m_s1

Additional Inherited Members
Public Types inherited from RandomMixin< InsecureRandomContext >
typedef uint64_t	result_type
Static Public Member Functions inherited from RandomMixin< InsecureRandomContext >
static constexpr uint64_t	min () noexcept
static constexpr uint64_t	max () noexcept
Protected Member Functions inherited from RandomMixin< InsecureRandomContext >
constexpr void	FlushCache () noexcept

Detailed Description

xoroshiro128++ PRNG.

Extremely fast, not appropriate for cryptographic purposes.

Memory footprint is very small, period is 2^128 - 1. This class is not thread-safe.

Reference implementation available at https://prng.di.unimi.it/xoroshiro128plusplus.c See https://prng.di.unimi.it/

Definition at line 424 of file random.h.

Constructor & Destructor Documentation

InsecureRandomContext()

InsecureRandomContext::InsecureRandomContext ( uint64_t seedval )

inlineexplicitconstexprnoexcept

Definition at line 438 of file random.h.

Member Function Documentation

rand64()

uint64_t InsecureRandomContext::rand64 ( )

inlineconstexprnoexcept

Definition at line 448 of file random.h.

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Reseed()

void InsecureRandomContext::Reseed ( uint64_t seedval )

inlineconstexprnoexcept

Definition at line 441 of file random.h.

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SplitMix64()

constexpr uint64_t InsecureRandomContext::SplitMix64 ( uint64_t & seedval )

inlinestaticnodiscardconstexprprivatenoexcept

Definition at line 429 of file random.h.

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Member Data Documentation

m_s0

uint64_t InsecureRandomContext::m_s0

private

Definition at line 426 of file random.h.

m_s1

uint64_t InsecureRandomContext::m_s1

private

Definition at line 427 of file random.h.

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The documentation for this class was generated from the following file:

• src/random.h