Struct rand::rngs::ThreadRng

pub struct ThreadRng { /* fields omitted */ }

The type returned by thread_rng, essentially just a reference to the PRNG in thread-local memory.

ThreadRng uses the same PRNG as StdRng for security and performance. As hinted by the name, the generator is thread-local. ThreadRng is a handle to this generator and thus supports Copy, but not Send or Sync.

Unlike StdRng, ThreadRng uses the ReseedingRng wrapper to reseed the PRNG from fresh entropy every 64 kiB of random data. OsRng is used to provide seed data.

Note that the reseeding is done as an extra precaution against side-channel attacks and mis-use (e.g. if somehow weak entropy were supplied initially). The PRNG algorithms used are assumed to be secure.

Trait Implementations

impl Clone for ThreadRng

fn clone(&self) -> ThreadRng

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for ThreadRng

impl CryptoRng for ThreadRng

impl Debug for ThreadRng

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

Formats the value using the given formatter.

impl Default for ThreadRng

fn default() -> ThreadRng

Returns the “default value” for a type.

impl RngCore for ThreadRng

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.