Struct Xoshiro128PlusPlus 

pub struct Xoshiro128PlusPlus { /* private fields */ }

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 xoshiro128plusplus.c reference source code by David Blackman and Sebastiano Vigna.

Implementations

impl Xoshiro128PlusPlus

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::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_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.

pub fn initialize_states(seed: u64, num_states: usize) -> Vec<Self>

Available on non-CUDA only.

Initializes multiple RNG states such that each state corresponds to a subsequence separated by 2**64 steps from eachother in the main sequence. This ensures that as long as no state requests more than 2**64 random numbers, the states are guaranteed to be fully independent.

Trait Implementations

impl Clone for Xoshiro128PlusPlus

fn clone(&self) -> Xoshiro128PlusPlus

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Xoshiro128PlusPlus

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

Formats the value using the given formatter.

impl PartialEq for Xoshiro128PlusPlus

fn eq(&self, other: &Xoshiro128PlusPlus) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl RngCore for Xoshiro128PlusPlus

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 Xoshiro128PlusPlus

fn from_seed(seed: [u8; 16]) -> Xoshiro128PlusPlus

Create a new Xoshiro128PlusPlus. If seed is entirely 0, it will be mapped to a different seed.

fn seed_from_u64(seed: u64) -> Xoshiro128PlusPlus

Seed a Xoshiro128PlusPlus from a u64 using SplitMix64.

type Seed = [u8; 16]

Seed type, which is restricted to types mutably-dereferenceable 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.

impl Copy for Xoshiro128PlusPlus

impl DeviceCopy for Xoshiro128PlusPlus

impl Eq for Xoshiro128PlusPlus

impl StructuralPartialEq for Xoshiro128PlusPlus