Struct rand_xoshiro::Xoshiro128StarStar

pub struct Xoshiro128StarStar { /* fields omitted */ }

A xoshiro128** random number generator.

The xoshiro128** algorithm is not suitable for cryptographic purposes, but is very fast and has excellent statistical properties.

The algorithm used here is translated from the xoshiro128starstar.c reference source code by David Blackman and Sebastiano Vigna.

Implementations

impl Xoshiro128StarStar

pub fn jump(&mut self)

Jump forward, equivalently to 2^64 calls to next_u32().

This can be used to generate 2^64 non-overlapping subsequences for parallel computations.

use rand_xoshiro::rand_core::SeedableRng;
use rand_xoshiro::Xoroshiro128StarStar;

let rng1 = Xoroshiro128StarStar::seed_from_u64(0);
let mut rng2 = rng1.clone();
rng2.jump();
let mut rng3 = rng2.clone();
rng3.jump();

pub fn long_jump(&mut self)

Jump forward, equivalently to 2^96 calls to next_u32().

This can be used to generate 2^32 starting points, from each of which jump() will generate 2^32 non-overlapping subsequences for parallel distributed computations.

Trait Implementations

impl Clone for Xoshiro128StarStar

fn clone(&self) -> Xoshiro128StarStar

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Xoshiro128StarStar

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl RngCore for Xoshiro128StarStar

fn next_u32(&mut self) -> u32

Return the next random u32.

fn next_u64(&mut self) -> u64

Return the next random u64.

fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data.

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

Fill dest entirely with random data.

impl SeedableRng for Xoshiro128StarStar

type Seed = [u8; 16]

Seed type, which is restricted to types mutably-dereferencable as u8 arrays (we recommend [u8; N] for some N).

fn from_seed(seed: [u8; 16]) -> Xoshiro128StarStar

Create a new Xoshiro128StarStar. If seed is entirely 0, it will be mapped to a different seed.

fn seed_from_u64(seed: u64) -> Xoshiro128StarStar

Seed a Xoshiro128StarStar from a u64 using SplitMix64.

pub fn from_rng<R>(rng: R) -> Result<Self, Error> where
    R: RngCore, 

Create a new PRNG seeded from another Rng.

pub fn from_entropy() -> Self

Creates a new instance of the RNG seeded via getrandom.