[][src]Struct rand::StdRng

pub struct StdRng { /* fields omitted */ }

The standard RNG. This is designed to be efficient on the current platform.

Methods

impl StdRng
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pub fn new() -> Result<StdRng, Error>
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Create a randomly seeded instance of StdRng.

This is a very expensive operation as it has to read randomness from the operating system and use this in an expensive seeding operation. If one is only generating a small number of random numbers, or doesn't need the utmost speed for generating each number, thread_rng and/or random may be more appropriate.

Reading the randomness from the OS may fail, and any error is propagated via the io::Result return value.

Trait Implementations

impl Copy for StdRng
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impl Debug for StdRng
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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 Rng for StdRng
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fn next_f32(&mut self) -> f32
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Return the next random f32 selected from the half-open interval [0, 1). Read more

fn next_f64(&mut self) -> f64
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Return the next random f64 selected from the half-open interval [0, 1). Read more

fn fill_bytes(&mut self, dest: &mut [u8])
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Fill dest with random data. Read more

fn gen<T>(&mut self) -> T where
    T: Rand
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Return a random value of a Rand type. Read more

Important traits for Generator<'a, T, R>
fn gen_iter<T>(&'a mut self) -> Generator<'a, T, Self> where
    T: Rand
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Return an iterator that will yield an infinite number of randomly generated items. Read more

fn gen_range<T>(&mut self, low: T, high: T) -> T where
    T: SampleRange + PartialOrd<T>, 
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Generate a random value in the range [low, high). Read more

fn gen_weighted_bool(&mut self, n: u32) -> bool
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Return a bool with a 1 in n chance of true Read more

Important traits for AsciiGenerator<'a, R>
fn gen_ascii_chars(&'a mut self) -> AsciiGenerator<'a, Self>
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Return an iterator of random characters from the set A-Z,a-z,0-9. Read more

fn choose<T>(&mut self, values: &'a [T]) -> Option<&'a T>
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Return a random element from values. Read more

fn choose_mut<T>(&mut self, values: &'a mut [T]) -> Option<&'a mut T>
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Return a mutable pointer to a random element from values. Read more

fn shuffle<T>(&mut self, values: &mut [T])
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Shuffle a mutable slice in place. Read more

impl<'a> SeedableRng<&'a [usize]> for StdRng
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Auto Trait Implementations

impl Send for StdRng

impl Sync for StdRng

Blanket Implementations

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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