Struct rand::rngs::ThreadRng

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pub struct ThreadRng { /* fields omitted */ }

[−] Expand description

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[+]

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fn clone(&self) -> ThreadRng[−]

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)[−]

Performs copy-assignment from source.

impl Copy for ThreadRng

impl CryptoRng for ThreadRng

impl Debug for ThreadRng[+]

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fn fmt(&self, f: &mut Formatter) -> Result[−]

Formats the value using the given formatter.

impl Default for ThreadRng[+]

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fn default() -> ThreadRng[−]

Returns the "default value" for a type.

impl RngCore for ThreadRng[+]

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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.