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[−][src]Struct rand::rngs::StdRng

pub struct StdRng(_);

The standard RNG. The PRNG algorithm in StdRng is chosen to be efficient on the current platform, to be statistically strong and unpredictable (meaning a cryptographically secure PRNG).

The current algorithm used on all platforms is HC-128, found in the rand_hc crate.

Reproducibility of output from this generator is however not required, thus future library versions may use a different internal generator with different output. Further, this generator may not be portable and can produce different output depending on the architecture. If you require reproducible output, use a named RNG, for example ChaChaRng from the rand_chacha crate.

Trait Implementations

impl Clone for StdRng
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fn clone_from(&mut self, source: &Self)
1.0.0
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Performs copy-assignment from source. Read more

impl Debug for StdRng
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impl RngCore for StdRng
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impl CryptoRng for StdRng
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impl SeedableRng for StdRng
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type Seed = <Hc128Rng as SeedableRng>::Seed

Seed type, which is restricted to types mutably-dereferencable as u8 arrays (we recommend [u8; N] for some N). Read more

fn seed_from_u64(state: u64) -> Self
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Create a new PRNG using a u64 seed. Read more

Auto Trait Implementations

impl Send for StdRng

impl Sync for StdRng

Blanket Implementations

impl<R> Rng for R where
    R: RngCore + ?Sized, 
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fn gen<T>(&mut self) -> T where
    Standard: Distribution<T>, 
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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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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<'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, 
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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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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

fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T>
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Deprecated since 0.6.0:

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>
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Deprecated since 0.6.0:

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])
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Deprecated since 0.6.0:

use SliceRandom::shuffle instead

Shuffle a mutable slice in place. Read more

impl<R> FromEntropy for R where
    R: SeedableRng, 
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impl<T> From for T
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impl<T, U> Into for T where
    U: From<T>, 
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impl<T> ToOwned for T where
    T: Clone, 
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type Owned = T

impl<T, U> TryFrom for T where
    T: From<U>, 
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type Error = !

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Borrow for T where
    T: ?Sized, 
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impl<T> BorrowMut for T where
    T: ?Sized, 
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impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

impl<T> Any for T where
    T: 'static + ?Sized, 
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impl<T> FromCast for T
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impl<T, U> Cast for T where
    U: FromCast<T>, 
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impl<T> FromBits for T
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impl<T, U> IntoBits for T where
    U: FromBits<T>, 
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