[−][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 Copy for ThreadRng
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impl Default for ThreadRng
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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 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
impl !Send for ThreadRng
impl Unpin for ThreadRng
impl !Sync for ThreadRng
impl UnwindSafe for ThreadRng
impl RefUnwindSafe for ThreadRng
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> 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> From<T> for 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<T> FromCast<T> for T
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impl<T, U> Cast<U> for T where
U: FromCast<T>,
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U: FromCast<T>,
impl<T> FromBits<T> for T
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impl<T, U> IntoBits<U> for T where
U: FromBits<T>,
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U: FromBits<T>,
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,