pub struct SimRng { /* private fields */ }Expand description
A seeded, deterministic random number generator handle.
Wraps a ChaCha8Rng seeded from the simulation seed, so the same seed
always yields the same draw sequence. Draw deterministic bytes and UUIDs
through the generation helpers below; they share their Uuid bit-stamping
with the crate::entropy::Entropy source an app is seeded with, so a
SimRng draw and an equivalently-seeded app draw agree.
Implementations§
Source§impl SimRng
impl SimRng
Sourcepub fn derive_uuid(&self, purpose_tag: impl AsRef<[u8]>) -> Uuid
pub fn derive_uuid(&self, purpose_tag: impl AsRef<[u8]>) -> Uuid
Derive a stable Uuid from this simulation’s seed and a purpose_tag
namespace, independently of the draw stream (seed-derived ids).
Unlike uuid_v4, this does not advance the RNG: the
same seed and purpose_tag always produce the same UUID no matter how
many other values have been drawn, so derive_uuid("tenant:acme") is a
stable, byte-reproducible id for “acme” across runs and machines. Ideal
for seeding multi-tenant fixtures without perturbing the deterministic id
stream. See crate::entropy::SeededEntropy::derive_uuid for the shared
mechanism and the version bits it sets (v4).
Sourcepub fn fill_bytes(&mut self, dest: &mut [u8])
pub fn fill_bytes(&mut self, dest: &mut [u8])
Fill dest with deterministic bytes.
Auto Trait Implementations§
impl Freeze for SimRng
impl RefUnwindSafe for SimRng
impl Send for SimRng
impl Sync for SimRng
impl Unpin for SimRng
impl UnsafeUnpin for SimRng
impl UnwindSafe for SimRng
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