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Rollup merge of #43374 - stjepang:fix-sort-randomization-comment, r=alexcrichton

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Clarify that sort_unstable is deterministic

@frankmcsherry complained that the documentation said "it is randomized but deterministic", which is a contradictory statement.

This PR uses a different and clearer wording.
This commit is contained in:
Mark Simulacrum 2017-07-24 09:16:34 -06:00 committed by GitHub
commit 32e607d4a8
1 changed files with 18 additions and 15 deletions
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33
src/liballoc/slice.rs
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@ -1252,12 +1252,13 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.
/// The current algorithm is based on [pattern-defeating quicksort][pdqsort] by Orson Peters,
/// which combines the fast average case of randomized quicksort with the fast worst case of
/// heapsort, while achieving linear time on slices with certain patterns. It uses some
/// randomization to avoid degenerate cases, but with a fixed seed to always provide
/// deterministic behavior.
///
/// It is generally faster than stable sorting, except in a few special cases, e.g. when the
/// It is typically faster than stable sorting, except in a few special cases, e.g. when the
/// slice consists of several concatenated sorted sequences.
///
/// # Examples
@ -1286,12 +1287,13 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.
/// The current algorithm is based on [pattern-defeating quicksort][pdqsort] by Orson Peters,
/// which combines the fast average case of randomized quicksort with the fast worst case of
/// heapsort, while achieving linear time on slices with certain patterns. It uses some
/// randomization to avoid degenerate cases, but with a fixed seed to always provide
/// deterministic behavior.
///
/// It is generally faster than stable sorting, except in a few special cases, e.g. when the
/// It is typically faster than stable sorting, except in a few special cases, e.g. when the
/// slice consists of several concatenated sorted sequences.
///
/// # Examples
@ -1323,12 +1325,13 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.
/// The current algorithm is based on [pattern-defeating quicksort][pdqsort] by Orson Peters,
/// which combines the fast average case of randomized quicksort with the fast worst case of
/// heapsort, while achieving linear time on slices with certain patterns. It uses some
/// randomization to avoid degenerate cases, but with a fixed seed to always provide
/// deterministic behavior.
///
/// It is generally faster than stable sorting, except in a few special cases, e.g. when the
/// It is typically faster than stable sorting, except in a few special cases, e.g. when the
/// slice consists of several concatenated sorted sequences.
///
/// # Examples