ctutils: pluggable trait impls for [T] and [T; N]#1388
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Introduces a set of helper traits for the following: - `CtAssign`: `CtAssignSlice` - `CtEq`: `CtEqSlice` - `CtSelect`: `CtSelectArray` Implementing a `*Slice` trait unlocks a blanket impl for the corresponding trait for `[T]`, e.g. impl'ing `CtAssignSlice` for `T` means `CtAssign` will now work with `[T]`. Likewise, implementing `CtSelectArray` unlocks the blanket impl of `CtSelect` for `[T; N]`, and `CtSelectArray` itself is already blanket impl'd for types which impl `Clone + CtAssignSlice + CtSelect`. All traits provide a default implementation with the option to plug in a faster one. The implementations on core integers thunk to the corresponding `Cmov`/`CmovEq` impls on slices of core integers, which in some cases have been optimized (especially `u8`).
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tarcieri
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Jan 20, 2026
## Added - `core::num::NonZero<T>` support (#1368) - Pluggable trait impls for `[T]` and `[T; N]` with helper traits: (#1388) - `CtAssign`: `CtAssignSlice` - `CtEq`: `CtEqSlice` - `CtSelect`: `CtSelectArray` - `CtSelectUsingCtAssign` marker trait (#1391) ## Changed - Split `CtAssign` out of `CtSelect` (#1363) - Bump `cmov` to v0.5 (#1386) ## Removed - `BytesCtEq`/`BytesCtSelect` no longer needed because default `[u8]` impls are fast (#1376) - `target_pointer_width` gating (#1389) - `unsafe` code (#1405)
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Introduces a set of helper traits for the following:
CtAssign:CtAssignSliceCtEq:CtEqSliceCtSelect:CtSelectArrayImplementing a
*Slicetrait unlocks a blanket impl for the corresponding trait for[T], e.g. impl'ingCtAssignSliceforTmeansCtAssignwill now work with[T].Likewise, implementing
CtSelectArrayunlocks the blanket impl ofCtSelectfor[T; N], andCtSelectArrayitself is already blanket impl'd for types which implClone + CtAssignSlice + CtSelect.All traits provide a default implementation with the option to plug in a faster one. The implementations on core integers thunk to the corresponding
Cmov/CmovEqimpls on slices of core integers, which in some cases have been optimized (especiallyu8).