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Let trait Fill be implemented for element types - #1652

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dhardy merged 5 commits into
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Aug 12, 2025
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Let trait Fill be implemented for element types#1652
dhardy merged 5 commits into
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push-nkpwnoqmsurr

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@dhardy

@dhardydhardy commented Aug 7, 2025

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  • Added a CHANGELOG.md entry

Summary

This is a simpler variant (no specialization support) of #1651.

Motivation

This trait was added to fill a capability gap: a safe interface for fast filling of slices like [i16]. The impls for [bool], [f32] etc. are extra complexity beyond this and unnecessary since they offer no benefit over element-wise generation in user-code.

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dhardy requested a review from newpavlovAugust 7, 2025 07:52
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newpavlov approved these changes Aug 7, 2025
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Looks good to me, but I worry that it may be technically considered a breaking change. It probably should not cause any breakage in practice, so I guess it's fine.

@dhardydhardy added the B-API Breakage: API label Aug 12, 2025
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dhardy commented Aug 12, 2025

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Yes, this is a breaking change. I'd like to start working towards the next rand version now; we may need to make a v0.9 branch.

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dhardy merged commit ead83fd into masterAug 12, 2025
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dhardy deleted the push-nkpwnoqmsurr branch August 12, 2025 12:27
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kodiakhqBot pushed a commit to pdylanross/fatigue that referenced this pull request Jun 25, 2026
@dependabot
chore: Bump rand from 0.9.4 to 0.10.1 (#483)
56f3729
Bumps rand from 0.9.4 to 0.10.1.
Changelog
Sourced from rand's changelog.
[0.10.1] — 2026-02-11
This release includes a fix for a soundness bug; see #1763.
Changes
Document panic behavior of make_rng and add #[track_caller] (#1761)
Deprecate feature log (#1763)
#1761: rust-random/rand#1761
#1763: rust-random/rand#1763
[0.10.0] - 2026-02-08
Changes
The dependency on rand_chacha has been replaced with a dependency on chacha20. This changes the implementation behind StdRng, but the output remains the same. There may be some API breakage when using the ChaCha-types directly as these are now the ones in chacha20 instead of rand_chacha (#1642).
Rename fns IndexedRandom::choose_multiple -> sample, choose_multiple_array -> sample_array, choose_multiple_weighted -> sample_weighted, struct SliceChooseIter -> IndexedSamples and fns IteratorRandom::choose_multiple -> sample, choose_multiple_fill -> sample_fill (#1632)
Use Edition 2024 and MSRV 1.85 (#1653)
Let Fill be implemented for element types, not sliceable types (#1652)
Fix OsError::raw_os_error on UEFI targets by returning Option<usize> (#1665)
Replace fn TryRngCore::read_adapter(..) -> RngReadAdapter with simpler struct RngReader (#1669)
Remove fns SeedableRng::from_os_rng, try_from_os_rng (#1674)
Remove Clone support for StdRng, ReseedingRng (#1677)
Use postcard instead of bincode to test the serde feature (#1693)
Avoid excessive allocation in IteratorRandom::sample when amount is much larger than iterator size (#1695)
Rename os_rng -> sys_rng, OsRng -> SysRng, OsError -> SysError (#1697)
Rename Rng -> RngExt as upstream rand_core has renamed RngCore -> Rng (#1717)
Additions
Add fns IndexedRandom::choose_iter, choose_weighted_iter (#1632)
Pub export Xoshiro128PlusPlus, Xoshiro256PlusPlus prngs (#1649)
Pub export ChaCha8Rng, ChaCha12Rng, ChaCha20Rng behind chacha feature (#1659)
Fn rand::make_rng() -> R where R: SeedableRng (#1734)
Removals
Removed ReseedingRng (#1722)
Removed unused feature "nightly" (#1732)
Removed feature small_rng (#1732)
#1632: rust-random/rand#1632
#1642: rust-random/rand#1642
#1649: rust-random/rand#1649
#1652: rust-random/rand#1652
#1653: rust-random/rand#1653
#1659: rust-random/rand#1659
#1665: rust-random/rand#1665
#1669: rust-random/rand#1669
#1674: rust-random/rand#1674
#1677: rust-random/rand#1677
#1693: rust-random/rand#1693
#1695: rust-random/rand#1695
#1697: rust-random/rand#1697
... (truncated)
Commits
27ff4cb Prepare v0.10.1: deprecate feature log (#1763)
98d0638 make_rng: document panic and add #[track_caller] (#1761)
54e5eaa Fix doc error (#1758)
1ce4c08 Bump itoa from 1.0.17 to 1.0.18 in the all-deps group (#1756)
ccb734b docs: fix typo in doc comment (#1754)
357eb7d Bump libc from 0.2.182 to 0.2.183 in the all-deps group (#1753)
5e77fe5 Fix trait references in documentation (#1752)
da89185 Bump the all-deps group with 3 updates (#1751)
50516ff Bump the all-deps group with 2 updates (#1749)
fd71de9 Bump the all-deps group with 2 updates (#1747)
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CHANGE: Allow Fill to be implemented for third-party types

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