Trait Rng 

pub trait Rng {
    // Required method
    fn fill<A>(&self, arr: A) -> Option<A>
       where A: AsMut<[u8]>;

    // Provided methods
    fn gen_u64(&self) -> Option<u64> { ... }
    fn gen_u128(&self) -> Option<u128> { ... }
}

A non-cryptographic source of randomness.

Required Methods

fn fill<A>(&self, arr: A) -> Option<A>

where A: AsMut<[u8]>,

Fill a buffer with random data.

This method may return None if the buffer couldn’t be filled with random data for any reason.

The buffer is expected to have a consistent implementation of AsMut that always returns a reference to the same underlying bytes. This isn’t required for safety, but can lead to unexpected results.

Provided Methods

fn gen_u64(&self) -> Option<u64>

Get a random 64bit number.

fn gen_u128(&self) -> Option<u128>

Get a random 128bit number.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<'a, T> Rng for &'a T

where T: Rng + ?Sized,

fn fill<A>(&self, arr: A) -> Option<A>

where A: AsMut<[u8]>,

fn gen_u64(&self) -> Option<u64>

fn gen_u128(&self) -> Option<u128>

impl<'a, T> Rng for Arc<T>

where T: Rng + 'a + ?Sized,

Available on crate feature alloc only.

fn fill<A>(&self, arr: A) -> Option<A>

where A: AsMut<[u8]>,

fn gen_u64(&self) -> Option<u64>

fn gen_u128(&self) -> Option<u128>

impl<'a, T> Rng for Box<T>

where T: Rng + 'a + ?Sized,

Available on crate feature alloc only.

fn fill<A>(&self, arr: A) -> Option<A>

where A: AsMut<[u8]>,

fn gen_u64(&self) -> Option<u64>

fn gen_u128(&self) -> Option<u128>

impl<'a, T> Rng for Option<T>

where T: Rng,

fn fill<A>(&self, arr: A) -> Option<A>

where A: AsMut<[u8]>,

fn gen_u64(&self) -> Option<u64>

fn gen_u128(&self) -> Option<u128>

Implementors

impl Rng for Empty

impl Rng for RandRng

impl<'a> Rng for dyn ErasedRng + 'a

impl<'a> Rng for dyn ErasedRng + Sync + Send + 'a

impl<T> Rng for AssertInternal<T>

where T: Rng,