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Rollup merge of #111973 - Sp00ph:update_current_impl, r=Amanieu

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Update current implementation comments for `select_nth_unstable`

This more accurately reflects the actual implementation, as it hasn't been a simple quickselect since #106997. While it does say that the current implementation always runs in O(n), I don't think it should require an FCP as it doesn't guarantee linearity in general and only points out that the current implementation is in fact linear.

r? `@Amanieu`
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Matthias Krüger 2023-05-27 00:23:59 +02:00 committed by GitHub
commit 18398ad337
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1 changed files with 6 additions and 4 deletions
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library/core/src/slice/mod.rs
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@ -3005,8 +3005,9 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on the quickselect portion of the same quicksort algorithm
/// used for [`sort_unstable`].
/// The current algorithm is an introselect implementation based on Pattern Defeating Quicksort, which is also
/// the basis for [`sort_unstable`]. The fallback algorithm is Median of Medians using Tukey's Ninther for
/// pivot selection, which guarantees linear runtime for all inputs.
///
/// [`sort_unstable`]: slice::sort_unstable
///
@ -3056,8 +3057,9 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on the quickselect portion of the same quicksort algorithm
/// used for [`sort_unstable`].
/// The current algorithm is an introselect implementation based on Pattern Defeating Quicksort, which is also
/// the basis for [`sort_unstable`]. The fallback algorithm is Median of Medians using Tukey's Ninther for
/// pivot selection, which guarantees linear runtime for all inputs.
///
/// [`sort_unstable`]: slice::sort_unstable
///