Struct xoshiro::Xoroshiro128StarStar

pub struct Xoroshiro128StarStar { /* fields omitted */ }

A xoroshiro128** random number generator.

The xoroshiro128** algorithm is not suitable for cryptographic purposes, but is very fast and has excellent statistical properties.

The algorithm used here is translated from the xoroshiro128starstar.c reference source code by David Blackman and Sebastiano Vigna.

Methods

impl Xoroshiro128StarStar

pub fn from_seed_u64(seed: u64) -> Xoroshiro128StarStar

Seed a Xoroshiro128StarStar from a u64 using SplitMix64.

pub fn jump(&mut self)

Jump forward, equivalently to 2^64 calls to next_u64().

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

use rand::SeedableRng;
use xoshiro::Xoroshiro128StarStar;

let rng1 = Xoroshiro128StarStar::from_seed_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_u64().

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 Debug for Xoroshiro128StarStar

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

Formats the value using the given formatter.

impl Clone for Xoroshiro128StarStar

fn clone(&self) -> Xoroshiro128StarStar

Returns a copy of the value.

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

Performs copy-assignment from source.

impl RngCore for Xoroshiro128StarStar

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 Xoroshiro128StarStar

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]) -> Xoroshiro128StarStar

Create a new Xoroshiro128StarStar. If seed is entirely 0, it will be mapped to a different seed.

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

Create a new PRNG seeded from another Rng.