Struct Rng 

pub struct Rng { /* private fields */ }

A deterministic pseudo-random number generator.

Internally splitmix64. Cheap to construct, no allocation.

Example

use dev_fixtures::mock::Rng;
let mut a = Rng::seeded(42);
let mut b = Rng::seeded(42);
assert_eq!(a.next_u64(), b.next_u64());

Implementations

impl Rng

pub fn seeded(seed: u64) -> Self

Build a new RNG from a seed.

pub fn next_u64(&mut self) -> u64

Step and return the next 64-bit value.

pub fn range(&mut self, n: u64) -> u64

Return a value uniformly in [0, n). For small n this is biased; the bias is bounded by 1 / 2^32 for n up to 2^31, which is fine for fixture purposes.