[−][src]Struct rand::rngs::ThreadRng
The type returned by thread_rng, essentially just a reference to the
PRNG in thread-local memory.
ThreadRng uses ReseedingRng wrapping the same PRNG as StdRng,
which is reseeded after generating 32 MiB of random data. A single instance
is cached per thread and the returned ThreadRng is a reference to this
instance — hence ThreadRng is neither Send nor Sync but is safe to use
within a single thread. This RNG is seeded and reseeded via EntropyRng
as required.
Note that the reseeding is done as an extra precaution against entropy
leaks and is in theory unnecessary — to predict ThreadRng's output, an
attacker would have to either determine most of the RNG's seed or internal
state, or crack the algorithm used.
Like StdRng, ThreadRng is a cryptographically secure PRNG. The current
algorithm used is HC-128, which is an array-based PRNG that trades memory
usage for better performance. This makes it similar to ISAAC, the algorithm
used in ThreadRng before rand 0.5.
Cloning this handle just produces a new reference to the same thread-local generator.
Trait Implementations
impl Clone for ThreadRng[src]
fn clone(&self) -> ThreadRng[src]
default fn clone_from(&mut self, source: &Self)1.0.0[src]
Performs copy-assignment from source. Read more
impl Default for ThreadRng[src]
impl Debug for ThreadRng[src]
impl RngCore for ThreadRng[src]
fn next_u32(&mut self) -> u32[src]
fn next_u64(&mut self) -> u64[src]
fn fill_bytes(&mut self, dest: &mut [u8])[src]
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>[src]
impl CryptoRng for ThreadRng[src]
Auto Trait Implementations
Blanket Implementations
impl<R> Rng for R where
R: RngCore + ?Sized, [src]
R: RngCore + ?Sized,
fn gen<T>(&mut self) -> T where
Standard: Distribution<T>, [src]
Standard: Distribution<T>,
Return a random value supporting the [Standard] distribution. Read more
fn gen_range<T: SampleUniform, B1, B2>(&mut self, low: B1, high: B2) -> T where
B1: SampleBorrow<T> + Sized,
B2: SampleBorrow<T> + Sized, [src]
B1: SampleBorrow<T> + Sized,
B2: SampleBorrow<T> + Sized,
Generate a random value in the range [low, high), i.e. inclusive of low and exclusive of high. Read more
fn sample<T, D: Distribution<T>>(&mut self, distr: D) -> T[src]
Sample a new value, using the given distribution. Read more
ⓘImportant traits for DistIter<'a, D, R, T>fn sample_iter<'a, T, D: Distribution<T>>(
&'a mut self,
distr: &'a D
) -> DistIter<'a, D, Self, T> where
Self: Sized, [src]
&'a mut self,
distr: &'a D
) -> DistIter<'a, D, Self, T> where
Self: Sized,
Create an iterator that generates values using the given distribution. Read more
fn fill<T: AsByteSliceMut + ?Sized>(&mut self, dest: &mut T)[src]
Fill dest entirely with random bytes (uniform value distribution), where dest is any type supporting AsByteSliceMut, namely slices and arrays over primitive integer types (i8, i16, u32, etc.). Read more
fn try_fill<T: AsByteSliceMut + ?Sized>(
&mut self,
dest: &mut T
) -> Result<(), Error>[src]
&mut self,
dest: &mut T
) -> Result<(), Error>
Fill dest entirely with random bytes (uniform value distribution), where dest is any type supporting AsByteSliceMut, namely slices and arrays over primitive integer types (i8, i16, u32, etc.). Read more
fn gen_bool(&mut self, p: f64) -> bool[src]
Return a bool with a probability p of being true. Read more
fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool[src]
Return a bool with a probability of numerator/denominator of being true. I.e. gen_ratio(2, 3) has chance of 2 in 3, or about 67%, of returning true. If numerator == denominator, then the returned value is guaranteed to be true. If numerator == 0, then the returned value is guaranteed to be false. Read more
fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T>[src]
use SliceRandom::choose instead
Return a random element from values. Read more
fn choose_mut<'a, T>(&mut self, values: &'a mut [T]) -> Option<&'a mut T>[src]
use SliceRandom::choose_mut instead
Return a mutable pointer to a random element from values. Read more
fn shuffle<T>(&mut self, values: &mut [T])[src]
use SliceRandom::shuffle instead
Shuffle a mutable slice in place. Read more
impl<T> ToOwned for T where
T: Clone, [src]
T: Clone,
impl<T> From for T[src]
impl<T, U> Into for T where
U: From<T>, [src]
U: From<T>,
impl<T, U> TryFrom for T where
U: Into<T>, [src]
U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>[src]
impl<T> Borrow for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut for T where
T: ?Sized, [src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T[src]
impl<T, U> TryInto for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>[src]
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,