[−][src]Struct rand::rngs::ThreadRng
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
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fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Default for ThreadRng
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impl Copy for ThreadRng
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impl Debug for ThreadRng
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impl RngCore for ThreadRng
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fn next_u32(&mut self) -> u32
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fn next_u64(&mut self) -> u64
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fn fill_bytes(&mut self, dest: &mut [u8])
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fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>
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impl CryptoRng for ThreadRng
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Auto Trait Implementations
Blanket Implementations
impl<R> Rng for R where
R: RngCore + ?Sized,
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R: RngCore + ?Sized,
fn gen<T>(&mut self) -> T where
Standard: Distribution<T>,
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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,
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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
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Sample a new value, using the given distribution. Read more
ⓘImportant traits for DistIter<D, R, T>fn sample_iter<T, D>(self, distr: D) -> DistIter<D, Self, T> where
D: Distribution<T>,
Self: Sized,
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D: Distribution<T>,
Self: Sized,
Create an iterator that generates values using the given distribution. Read more
fn fill<T: AsByteSliceMut + ?Sized>(&mut self, dest: &mut T)
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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>
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&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
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Return a bool with a probability p
of being true. Read more
fn gen_ratio(&mut self, numerator: u32, denominator: u32) -> bool
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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
impl<T> From<T> for T
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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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>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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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>
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impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
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V: MultiLane<T>,