Struct SimRng 

pub struct SimRng { /* private fields */ }

A splitmix64 pseudo-random stream.

Implementations

impl SimRng

pub fn from_seed(seed: Seed) -> Self

Creates a stream from a seed. A zero state is fine for splitmix64.

pub fn next_u64(&mut self) -> u64

Advances the stream and returns the next 64-bit value.

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

Uniform value in 0..n, using the multiply-high trick to avoid modulo bias. Panics if n is zero.

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

Uniform value in min..max (half-open). Panics on an empty range.

pub fn chance(&mut self, per_mille: u32) -> bool

True with probability per_mille / 1000.

pub fn fork(&mut self) -> SimRng

Splits off an independent stream for a subsystem.

pub fn fork_label(&self, label: &str) -> SimRng

Derives a named independent stream without advancing this one. The label is mixed into the current state with FNV-1a.

Trait Implementations

impl Clone for SimRng

fn clone(&self) -> SimRng

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SimRng

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

Formats the value using the given formatter.