Struct plonk_pallet::FullcodecRng

pub struct FullcodecRng { /* fields omitted */ }

An Xorshift random number generator.

The Xorshift¹ algorithm is not suitable for cryptographic purposes but is very fast. If you do not know for sure that it fits your requirements, use a more secure one such as StdRng or OsRng.

When seeded with zero (i.e. XorShiftRng::from_seed(0) is called), this implementation actually uses 0xBAD_5EED_0BAD_5EED_0BAD_5EED_0BAD_5EED for the seed. This arbitrary value is used because the underlying algorithm can’t escape from an all-zero state, and the function is infallible so it can’t signal this by returning an error.

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1. Marsaglia, George (July 2003). “Xorshift RNGs”. Journal of Statistical Software. Vol. 8 (Issue 14). ↩

Trait Implementations

impl Clone for XorShiftRng

pub fn clone(&self) -> XorShiftRng

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for XorShiftRng

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

Formats the value using the given formatter.

impl Decode for XorShiftRng

pub fn decode<I>(input: &mut I) -> Result<XorShiftRng, Error> where
    I: Input, 

Attempt to deserialise the value from input.

fn skip<I>(input: &mut I) -> Result<(), Error> where
    I: Input, 

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Encode for XorShiftRng

pub fn encode(&self) -> Vec<u8, Global>

Convert self to an owned vector.

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode_to<T>(&self, dest: &mut T) where
    T: Output + ?Sized, 

Convert self to a slice and append it to the destination.

fn using_encoded<R, F>(&self, f: F) -> R where
    F: FnOnce(&[u8]) -> R, 

Convert self to a slice and then invoke the given closure with it.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl PartialEq<XorShiftRng> for XorShiftRng

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl RngCore for XorShiftRng

pub fn next_u32(&mut self) -> u32

Return the next random u32.

pub fn next_u64(&mut self) -> u64

Return the next random u64.

pub fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data.

pub fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

Fill dest entirely with random data.

impl SeedableRng for XorShiftRng

type Seed = [u8; 16]

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

pub fn from_seed(seed: <XorShiftRng as SeedableRng>::Seed) -> XorShiftRng

Create a new PRNG using the given seed.

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

Create a new PRNG seeded from another Rng.

fn seed_from_u64(state: u64) -> Self

Create a new PRNG using a u64 seed.

fn from_entropy() -> Self

Creates a new instance of the RNG seeded via getrandom.

impl Eq for XorShiftRng

impl StructuralEq for XorShiftRng

impl StructuralPartialEq for XorShiftRng