Struct rand_xoshiro::Xoroshiro128PlusPlus

pub struct Xoroshiro128PlusPlus { /* private fields */ }

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 xoroshiro128plusplus.c reference source code by David Blackman and Sebastiano Vigna.

Implementations

impl Xoroshiro128PlusPlus

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_xoshiro::rand_core::SeedableRng;
use rand_xoshiro::Xoroshiro128PlusPlus;

let rng1 = Xoroshiro128PlusPlus::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_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 Clone for Xoroshiro128PlusPlus

fn clone(&self) -> Xoroshiro128PlusPlus

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Xoroshiro128PlusPlus

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

Formats the value using the given formatter.

impl RngCore for Xoroshiro128PlusPlus

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 Xoroshiro128PlusPlus

fn from_seed(seed: [u8; 16]) -> Xoroshiro128PlusPlus

Create a new Xoroshiro128PlusPlus. If seed is entirely 0, it will be mapped to a different seed.

fn seed_from_u64(seed: u64) -> Xoroshiro128PlusPlus

Seed a Xoroshiro128PlusPlus from a u64 using SplitMix64.

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

Create a new PRNG seeded from another Rng.