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doc: guarantee call order for sort_by_cached_key #89621

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merged 3 commits into from
Jan 19, 2022
Merged

doc: guarantee call order for sort_by_cached_key #89621

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3eb87db
doc: guarantee call order for sort_by_cached_key
digama0 Oct 7, 2021
b9f008b
Update wording
digama0 Jan 4, 2022
06b17a2
Clarify that ordering is unspecified
digama0 Jan 5, 2022
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5 changes: 4 additions & 1 deletion library/alloc/src/slice.rs
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Expand Up @@ -371,7 +371,10 @@ impl<T> [T] {

/// Sorts the slice with a key extraction function.
///
/// During sorting, the key function is called only once per element.
/// During sorting, the key function is called at most once per element, by using
/// temporary storage to remember the results of key evaluation.
/// The order of calls to the key function is unspecified and may change in future versions
/// of the standard library.
///
/// This sort is stable (i.e., does not reorder equal elements) and *O*(*m* \* *n* + *n* \* log(*n*))
/// worst-case, where the key function is *O*(*m*).
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