pub struct StdRng { /* private fields */ }
Expand description
The standard RNG. This is designed to be efficient on the current platform.
Implementations§
source§impl StdRng
impl StdRng
sourcepub fn new() -> Result<StdRng, Error>
pub fn new() -> Result<StdRng, Error>
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§
source§impl Rng for StdRng
impl Rng for StdRng
source§fn next_f32(&mut self) -> f32
fn next_f32(&mut self) -> f32
Return the next random f32 selected from the half-open
interval
[0, 1)
. Read moresource§fn next_f64(&mut self) -> f64
fn next_f64(&mut self) -> f64
Return the next random f64 selected from the half-open
interval
[0, 1)
. Read moresource§fn fill_bytes(&mut self, dest: &mut [u8])
fn fill_bytes(&mut self, dest: &mut [u8])
Fill
dest
with random data. Read moresource§fn gen<T>(&mut self) -> Twhere
T: Rand,
Self: Sized,
fn gen<T>(&mut self) -> Twhere
T: Rand,
Self: Sized,
Return a random value of a
Rand
type. Read moresource§fn gen_iter<T, 'a>(&'a mut self) -> Generator<'a, T, Self> ⓘwhere
T: Rand,
Self: Sized,
fn gen_iter<T, 'a>(&'a mut self) -> Generator<'a, T, Self> ⓘwhere
T: Rand,
Self: Sized,
Return an iterator that will yield an infinite number of randomly
generated items. Read more
source§fn gen_range<T>(&mut self, low: T, high: T) -> Twhere
T: PartialOrd<T> + SampleRange,
Self: Sized,
fn gen_range<T>(&mut self, low: T, high: T) -> Twhere
T: PartialOrd<T> + SampleRange,
Self: Sized,
source§fn gen_weighted_bool(&mut self, n: u32) -> boolwhere
Self: Sized,
fn gen_weighted_bool(&mut self, n: u32) -> boolwhere
Self: Sized,
Return a bool with a 1 in n chance of true Read more
source§fn gen_ascii_chars<'a>(&'a mut self) -> AsciiGenerator<'a, Self> ⓘwhere
Self: Sized,
fn gen_ascii_chars<'a>(&'a mut self) -> AsciiGenerator<'a, Self> ⓘwhere
Self: Sized,
Return an iterator of random characters from the set A-Z,a-z,0-9. Read more
source§fn choose<T, 'a>(&mut self, values: &'a [T]) -> Option<&'a T>where
Self: Sized,
fn choose<T, 'a>(&mut self, values: &'a [T]) -> Option<&'a T>where
Self: Sized,
Return a random element from
values
. Read more