Struct rand::StdRng

pub struct StdRng {
    // some fields omitted
}

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

Methods

impl StdRng

fn new() -> Result<StdRng>

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

fn next_u32(&mut self) -> u32

fn next_u64(&mut self) -> u64

fn next_f32(&mut self) -> f32

fn next_f64(&mut self) -> f64

fn fill_bytes(&mut self, dest: &mut [u8])

fn gen<T: Rand>(&mut self) -> T where Self: Sized

fn gen_iter<'a, T: Rand>(&'a mut self) -> Generator<'a, T, Self> where Self: Sized

fn gen_range<T: PartialOrd + SampleRange>(&mut self, low: T, high: T) -> T where Self: Sized

fn gen_weighted_bool(&mut self, n: u32) -> bool where Self: Sized

fn gen_ascii_chars<'a>(&'a mut self) -> AsciiGenerator<'a, Self> where Self: Sized

fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T> where Self: Sized

fn shuffle<T>(&mut self, values: &mut [T]) where Self: Sized

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

fn reseed(&mut self, seed: &'a [usize])

fn from_seed(seed: &'a [usize]) -> StdRng

Derived Implementations

impl Clone for StdRng

fn clone(&self) -> StdRng

fn clone_from(&mut self, source: &Self)

impl Copy for StdRng