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Take consuming key in position_{min,max,minmax}_by_key() #1137

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Merged
phimuemue merged 1 commit into from
Oct 21, 2026
Merged

Take consuming key in position_{min,max,minmax}_by_key() #1137

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18 changes: 9 additions & 9 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4616,13 +4616,13 @@ pub trait Itertools: Iterator {
/// let a = [1_i32, 1, -1, -1];
/// assert_eq!(a.iter().position_max_by_key(|x| x.abs()), Some(3));
/// ```
fn position_max_by_key<K, F>(self, mut key: F) -> Option<usize>
fn position_max_by_key<K, F>(self, key: F) -> Option<usize>
where
Self: Sized,
K: Ord,
F: FnMut(&Self::Item) -> K,
F: FnMut(Self::Item) -> K,
{
self.map(|item| key(&item)).position_max()
self.map(key).position_max()
}

/// Return the position of the maximum element in the iterator, as
Expand Down Expand Up @@ -4704,13 +4704,13 @@ pub trait Itertools: Iterator {
/// let a = [1_i32, 1, -1, -1];
/// assert_eq!(a.iter().position_min_by_key(|x| x.abs()), Some(0));
/// ```
fn position_min_by_key<K, F>(self, mut key: F) -> Option<usize>
fn position_min_by_key<K, F>(self, key: F) -> Option<usize>
where
Self: Sized,
K: Ord,
F: FnMut(&Self::Item) -> K,
F: FnMut(Self::Item) -> K,
{
self.map(|item| key(&item)).position_min()
self.map(key).position_min()
}

/// Return the position of the minimum element in the iterator, as
Expand Down Expand Up @@ -4832,13 +4832,13 @@ pub trait Itertools: Iterator {
/// ```
///
/// [`position_minmax`]: Self::position_minmax
fn position_minmax_by_key<K, F>(self, mut key: F) -> MinMaxResult<usize>
fn position_minmax_by_key<K, F>(self, key: F) -> MinMaxResult<usize>
where
Self: Sized,
K: PartialOrd,
F: FnMut(&Self::Item) -> K,
F: FnMut(Self::Item) -> K,
{
self.map(|item| key(&item)).position_minmax()
self.map(key).position_minmax()
}

/// Return the positions of the minimum and maximum elements of an
Expand Down
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