Struct rand::rngs::mock::StepRng

[+] Show declaration

pub struct StepRng { /* fields omitted */ }

[−] Expand description

A simple implementation of RngCore for testing purposes.

This generates an arithmetic sequence (i.e. adds a constant each step) over a u64 number, using wrapping arithmetic. If the increment is 0 the generator yields a constant.

use rand::Rng;
use rand::rngs::mock::StepRng;
 
let mut my_rng = StepRng::new(2, 1);
let sample: [u64; 3] = my_rng.gen();
assert_eq!(sample, [2, 3, 4]);

Methods

impl StepRng

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pub fn new(initial: u64, increment: u64) -> Self

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Create a StepRng, yielding an arithmetic sequence starting with initial and incremented by increment each time.

Trait Implementations

impl Debug for StepRng

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fn fmt(&self, f: &mut Formatter) -> Result

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Formats the value using the given formatter.

impl Clone for StepRng

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fn clone(&self) -> StepRng

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Returns a copy of the value.

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

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Performs copy-assignment from source.

impl RngCore for StepRng

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fn next_u32(&mut self) -> u32

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Return the next random u32.

fn next_u64(&mut self) -> u64

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Return the next random u64.

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

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Fill dest with random data.

fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>

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Fill dest entirely with random data.