Struct xoshiro::Xoroshiro128Plus

pub struct Xoroshiro128Plus { /* fields omitted */ }

A xoroshiro128+ random number generator.

The xoroshiro128+ algorithm is not suitable for cryptographic purposes, but is very fast and has good statistical properties, besides a low linear complexity in the lowest bits.

The algorithm used here is translated from the xoroshiro128plus.c reference source code by David Blackman and Sebastiano Vigna.

Methods

impl Xoroshiro128Plus

pub fn from_seed_u64(seed: u64) -> Xoroshiro128Plus

Seed a Xoroshiro128Plus 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::Xoroshiro128Plus;

let rng1 = Xoroshiro128Plus::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 Xoroshiro128Plus

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

Formats the value using the given formatter.

impl Clone for Xoroshiro128Plus

fn clone(&self) -> Xoroshiro128Plus

Returns a copy of the value.

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

Performs copy-assignment from source.

impl RngCore for Xoroshiro128Plus

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 Xoroshiro128Plus

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]) -> Xoroshiro128Plus

Create a new Xoroshiro128Plus. 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.