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@dhardy dhardy released this 27 Jan 13:41
· 6 commits to master since this release
0.9.0
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Learn about vigilant mode.

Upgrade guide

See https://rust-random.github.io/book/update-0.9.html

Changelog

Security and unsafe

  • Policy: "rand is not a crypto library" (#1514)
  • Remove fork-protection from ReseedingRng and ThreadRng. Instead, it is recommended to call ThreadRng::reseed on fork. (#1379)
  • Use zerocopy to replace some unsafe code (#1349, #1393, #1446, #1502)

Dependencies

  • Bump the MSRV to 1.63.0 (#1207, #1246, #1269, #1341, #1416, #1536); note that 1.60.0 may work for dependents when using --ignore-rust-version
  • Update to rand_core v0.9.0 (#1558)

Features

  • Support std feature without getrandom or rand_chacha (#1354)
  • Enable feature small_rng by default (#1455)
  • Remove implicit feature rand_chacha; use std_rng instead. (#1473)
  • Rename feature serde1 to serde (#1477)
  • Rename feature getrandom to os_rng (#1537)
  • Add feature thread_rng (#1547)

API changes: rand_core traits

  • Add fn RngCore::read_adapter implementing std::io::Read (#1267)
  • Add trait CryptoBlockRng: BlockRngCore; make trait CryptoRng: RngCore (#1273)
  • Add traits TryRngCore, TryCryptoRng (#1424, #1499)
  • Rename fn SeedableRng::from_rng -> try_from_rng and add infallible variant fn from_rng (#1424)
  • Rename fn SeedableRng::from_entropy -> from_os_rng and add fallible variant fn try_from_os_rng (#1424)
  • Add bounds Clone and AsRef to associated type SeedableRng::Seed (#1491)

API changes: Rng trait and top-level fns

  • Rename fn rand::thread_rng() to rand::rng() and remove from the prelude (#1506)
  • Remove fn rand::random() from the prelude (#1506)
  • Add top-level fns random_iter, random_range, random_bool, random_ratio, fill (#1488)
  • Re-introduce fn Rng::gen_iter as random_iter (#1305, #1500)
  • Rename fn Rng::gen to random to avoid conflict with the new gen keyword in Rust 2024 (#1438)
  • Rename fns Rng::gen_range to random_range, gen_bool to random_bool, gen_ratio to random_ratio (#1505)
  • Annotate panicking methods with #[track_caller] (#1442, #1447)

API changes: RNGs

  • Fix <SmallRng as SeedableRng>::Seed size to 256 bits (#1455)
  • Remove first parameter (rng) of ReseedingRng::new (#1533)

API changes: Sequences

  • Split trait SliceRandom into IndexedRandom, IndexedMutRandom, SliceRandom (#1382)
  • Add IndexedRandom::choose_multiple_array, index::sample_array (#1453, #1469)

API changes: Distributions: renames

  • Rename module rand::distributions to rand::distr (#1470)
  • Rename distribution Standard to StandardUniform (#1526)
  • Move distr::Slice -> distr::slice::Choose, distr::EmptySlice -> distr::slice::Empty (#1548)
  • Rename trait distr::DistString -> distr::SampleString (#1548)
  • Rename distr::DistIter -> distr::Iter, distr::DistMap -> distr::Map (#1548)

API changes: Distributions

  • Relax Sized bound on Distribution<T> for &D (#1278)
  • Remove impl of Distribution<Option<T>> for StandardUniform (#1526)
  • Let distribution StandardUniform support all NonZero* types (#1332)
  • Fns {Uniform, UniformSampler}::{new, new_inclusive} return a Result (instead of potentially panicking) (#1229)
  • Distribution Uniform implements TryFrom instead of From for ranges (#1229)
  • Add UniformUsize (#1487)
  • Remove support for generating isize and usize values with StandardUniform, Uniform (except via UniformUsize) and Fill and usage as a WeightedAliasIndex weight (#1487)
  • Add impl DistString for distributions Slice<char> and Uniform<char> (#1315)
  • Add fn Slice::num_choices (#1402)
  • Add fn p() for distribution Bernoulli to access probability (#1481)

API changes: Weighted distributions

  • Add pub module rand::distr::weighted, moving WeightedIndex there (#1548)
  • Add trait weighted::Weight, allowing WeightedIndex to trap overflow (#1353)
  • Add fns weight, weights, total_weight to distribution WeightedIndex (#1420)
  • Rename enum WeightedError to weighted::Error, revising variants (#1382) and mark as #[non_exhaustive] (#1480)

API changes: SIMD

  • Switch to std::simd, expand SIMD & docs (#1239)

Reproducibility-breaking changes

  • Make ReseedingRng::reseed discard remaining data from the last block generated (#1379)
  • Change fn SmallRng::seed_from_u64 implementation (#1203)
  • Allow UniformFloat::new samples and UniformFloat::sample_single to yield high (#1462)
  • Fix portability of distribution Slice (#1469)
  • Make Uniform for usize portable via UniformUsize (#1487)
  • Fix IndexdRandom::choose_multiple_weighted for very small seeds and optimize for large input length / low memory (#1530)

Reproducibility-breaking optimisations

  • Optimize fn sample_floyd, affecting output of rand::seq::index::sample and rand::seq::SliceRandom::choose_multiple (#1277)
  • New, faster algorithms for IteratorRandom::choose and choose_stable (#1268)
  • New, faster algorithms for SliceRandom::shuffle and partial_shuffle (#1272)
  • Optimize distribution Uniform: use Canon's method (single sampling) / Lemire's method (distribution sampling) for faster sampling (breaks value stability; #1287)
  • Optimize fn sample_single_inclusive for floats (+~20% perf) (#1289)

Other optimisations

  • Improve SmallRng initialization performance (#1482)
  • Optimise SIMD widening multiply (#1247)

Other

  • Add Cargo.lock.msrv file (#1275)
  • Reformat with rustfmt and enforce (#1448)
  • Apply Clippy suggestions and enforce (#1448, #1474)
  • Move all benchmarks to new benches crate (#1329, #1439) and migrate to Criterion (#1490)

Documentation

  • Improve ThreadRng related docs (#1257)
  • Docs: enable experimental --generate-link-to-definition feature (#1327)
  • Better doc of crate features, use doc_auto_cfg (#1411, #1450)

All PRs

New Contributors

Full Changelog: 0.8.5...0.9.0

Contributors

vks, ComputerDruid, and 48 other contributors
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