Function core::slice::sort::choose_pivot

pub(super) fn choose_pivot<T, F>(v: &mut [T], is_less: &mut F) -> (usize, bool)where
    F: FnMut(&T, &T) -> bool,

🔬This is a nightly-only experimental API. (slice_internals)

Chooses a pivot in v and returns the index and true if the slice is likely already sorted.

Elements in v might be reordered in the process.