Struct rand::StdRng
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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 Rng for StdRng
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fn next_u32(&mut self) -> u32
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Return the next random u32. Read more
fn next_u64(&mut self) -> u64
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Return the next random u64. Read more
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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T: Rand,
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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T: Rand,
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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T: SampleRange + PartialOrd<T>,
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 Debug for StdRng
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fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
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Formats the value using the given formatter. Read more
impl Copy for StdRng
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impl Clone for StdRng
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fn clone(&self) -> StdRng
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more