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Clarify [T]::select_nth_unstable* return values #98111

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Sep 25, 2022
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Clarify [T]::select_nth_unstable* return values #98111

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25 changes: 14 additions & 11 deletions library/core/src/slice/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2628,9 +2628,10 @@ impl<T> [T] {
/// less than or equal to any value at a position `j > index`. Additionally, this reordering is
/// unstable (i.e. any number of equal elements may end up at position `index`), in-place
/// (i.e. does not allocate), and *O*(*n*) worst-case. This function is also/ known as "kth
/// element" in other libraries. It returns a triplet of the following values: all elements less
/// than the one at the given index, the value at the given index, and all elements greater than
/// the one at the given index.
/// element" in other libraries. It returns a triplet of the following from the reordered slice:
/// the subslice prior to `index`, the element at `index`, and the subslice after `index`;
/// accordingly, the values in those two subslices will respectively all be less-than-or-equal-to
/// and greater-than-or-equal-to the value of the element at `index`.
///
/// # Current implementation
///
Expand Down Expand Up @@ -2675,10 +2676,11 @@ impl<T> [T] {
/// less than or equal to any value at a position `j > index` using the comparator function.
/// Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) worst-case. This function
/// is also known as "kth element" in other libraries. It returns a triplet of the following
/// values: all elements less than the one at the given index, the value at the given index,
/// and all elements greater than the one at the given index, using the provided comparator
/// function.
/// is also known as "kth element" in other libraries. It returns a triplet of the following from
/// the slice reordered according to the provided comparator function: the subslice prior to
/// `index`, the element at `index`, and the subslice after `index`; accordingly, the values in
/// those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to
/// the value of the element at `index`.
///
/// # Current implementation
///
Expand Down Expand Up @@ -2727,10 +2729,11 @@ impl<T> [T] {
/// less than or equal to any value at a position `j > index` using the key extraction function.
/// Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
/// position `index`), in-place (i.e. does not allocate), and *O*(*n*) worst-case. This function
/// is also known as "kth element" in other libraries. It returns a triplet of the following
/// values: all elements less than the one at the given index, the value at the given index, and
/// all elements greater than the one at the given index, using the provided key extraction
/// function.
/// is also known as "kth element" in other libraries. It returns a triplet of the following from
/// the slice reordered according to the provided key extraction function: the subslice prior to
/// `index`, the element at `index`, and the subslice after `index`; accordingly, the values in
/// those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to
/// the value of the element at `index`.
///
/// # Current implementation
///
Expand Down