Add array::IntoIter::{empty, from_raw_parts}
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jyn514
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Nov 29, 2021
kennytm
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Dec 6, 2021
`array::IntoIter` has a bunch of really handy logic for dealing with partial arrays, but it's currently hamstrung by only being creatable from a fully-initialized array. This PR adds two new constructors: - a safe & const `empty`, since `[].into_iter()` gives `<T, 0>`, not `<T, N>`. - an unsafe `from_raw_parts`, to allow experimentation with new uses. (Slice & vec iterators don't need `from_raw_parts` because you `from_raw_parts` the slice or vec instead, but there's no useful way to made a `<[T; N]>::from_raw_parts`, so I think this is a reasonable place to have one.)
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@bors r+ rollup |
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…askrgr Rollup of 10 pull requests Successful merges: - rust-lang#87614 (Recommend fix `count()` -> `len()` on slices) - rust-lang#91065 (Add test for evaluate_obligation: Ok(EvaluatedToOkModuloRegions) ICE) - rust-lang#91312 (Fix AnonConst ICE) - rust-lang#91341 (Add `array::IntoIter::{empty, from_raw_parts}`) - rust-lang#91493 (Remove a dead code path.) - rust-lang#91503 (Tweak "call this function" suggestion to have smaller span) - rust-lang#91547 (Suggest try_reserve in try_reserve_exact) - rust-lang#91562 (Pretty print async block without redundant space) - rust-lang#91620 (Update books) - rust-lang#91622 (:arrow_up: rust-analyzer) Failed merges: - rust-lang#91571 (Remove unneeded access to pretty printer's `s` field in favor of deref) r? `@ghost` `@rustbot` modify labels: rollup
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array::IntoIterhas a bunch of really handy logic for dealing with partial arrays, but it's currently hamstrung by only being creatable from a fully-initialized array.This PR adds two new constructors:
empty, since[].into_iter()can only giveIntoIter<T, 0>, notIntoIter<T, N>.from_raw_parts, to allow experimentation with new uses.(Slice & vec iterators don't need
from_raw_partsbecause youfrom_raw_partsthe slice or vec instead, but there's no useful way to made a<[T; N]>::from_raw_parts, so I think this is a reasonable place to have one.)