Struct FastRng 

pub struct FastRng { /* private fields */ }

A small, fast, non-cryptographic rng with decent statistical properties. Useful for sampling non-security sensitive data or as a deterministic RNG for tests (instead of the SysRng above, which uses the global OS RNG).

The implementation is the same as Xoroshiro64Star.

Implementations

impl FastRng

pub fn new() -> Self

pub fn from_sysrng(sys_rng: &mut SysRng) -> Self

Seed a new FastRng from an existing SysRng.

pub fn from_u64(s: u64) -> Self

Trait Implementations

impl Debug for FastRng

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

Formats the value using the given formatter.

impl Default for FastRng

fn default() -> Self

Returns the “default value” for a type.

impl RngCore for FastRng

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 FastRng

type Seed = [u8; 8]

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

fn from_seed(seed: Self::Seed) -> Self

Create a new PRNG using the given seed.

fn seed_from_u64(state: u64) -> Self

Create a new PRNG using a u64 seed.

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

where R: RngCore,

Create a new PRNG seeded from another Rng.