Struct Faker 

pub struct Faker { /* private fields */ }

The seedable random-value source every template’s random defaults draw from.

A SplitMix64 generator (Steele, Lea & Flood’s public-domain algorithm), implemented here rather than depended upon — see the crate docs for the fake-vs-rand-vs-in-crate evaluation. The output sequence for a given seed is pinned by test in this crate: two Faker::seeded instances with the same seed produce identical values, on every platform, forever — that is the determinism switch’s whole contract.

Not cryptographic, and not meant to be: this generates test data.

Implementations

impl Faker

pub fn seeded(seed: u64) -> Self

A faker whose entire output is determined by seed — the reproducibility switch. Same seed, same values, always.

pub fn from_entropy() -> Self

A faker seeded from wall-clock entropy plus a process-global counter — what create/create_many use when the caller does not care about reproducing the run.

pub fn next_u64(&mut self) -> u64

The next raw 64-bit value.

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

A value in 0..n. The multiply-shift reduction carries a negligible modulo bias — acceptable for test data, and deterministic, which is what matters here.

Panics

If n is zero — an empty range has no value to produce.

pub fn i64_in(&mut self, lo: i64, hi: i64) -> i64

A value in lo..=hi.

Panics

If lo > hi.

pub fn i32_in(&mut self, lo: i32, hi: i32) -> i32

A value in lo..=hi, i32-typed for dialects whose integer is 32-bit.

Panics

If lo > hi.

pub fn alnum(&mut self, len: usize) -> String

A random lowercase-alphanumeric string of len characters — "user-{alnum}"-style default values are built from this.

Trait Implementations

impl Clone for Faker

fn clone(&self) -> Faker

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Faker

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

Formats the value using the given formatter.