Add stable_hash.

This commit is contained in:
Stephen Chung 2022-09-26 23:45:50 +08:00
parent 3a3653f42a
commit 20d4b71591
3 changed files with 11 additions and 1 deletions

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@ -4,6 +4,11 @@ Rhai Release Notes
Version 1.11.0
==============
New features
------------
* A new feature flag, `stable_hash`, is added that forces hashing to be consistent using a fixed seed.
Enhancements
------------

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@ -62,6 +62,7 @@ metadata = ["serde", "serde_json", "rhai_codegen/metadata", "smartstring/serde"]
internals = [] # expose internal data structures
debugging = ["internals"] # enable debugging
serde = ["dep:serde", "smartstring/serde", "smallvec/serde"] # implement serde for rhai types
stable_hash = [] # perform all hashing with fixed seed value
# compiling for no-std
no_std = ["no-std-compat", "num-traits/libm", "core-error", "libm", "ahash/compile-time-rng", "hashbrown/ahash-compile-time-rng"]

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@ -74,7 +74,11 @@ impl BuildHasher for StraightHasherBuilder {
#[inline(always)]
#[must_use]
pub fn get_hasher() -> ahash::AHasher {
ahash::AHasher::default()
if cfg!(feature = "stable_hash") {
ahash::RandomState::with_seeds(42, 999, 123, 0).build_hasher()
} else {
ahash::AHasher::default()
}
}
/// Calculate a non-zero [`u64`] hash key from a namespace-qualified variable name.