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Showing content from https://github.com/rust-lang/rust/issues/64295 below:

Tracking issue for iter_order_by · Issue #64295 · rust-lang/rust · GitHub

Landed in #62205

pub mod core {
    pub mod iter {
        mod traits {
            mod iterator {
                pub trait Iterator {
                    fn cmp_by<I, F>(mut self, other: I, mut cmp: F) -> Ordering
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> Ordering,
                    {
                    }
                    fn partial_cmp_by<I, F>(
                        mut self,
                        other: I,
                        mut partial_cmp: F,
                    ) -> Option<Ordering>
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> Option<Ordering>,
                    {
                    }
                    fn eq_by<I, F>(mut self, other: I, mut eq: F) -> bool
                    where
                        Self: Sized,
                        I: IntoIterator,
                        F: FnMut(Self::Item, I::Item) -> bool,
                    {
                    }
                }
            }
        }
    }
}

• Stabilization PR

• Should we use size_hint as an optimization for equality checking? That means buggy iterators may return incorrect results for eq_by. We could optimize for just a handful of TrustedLen iterators instead.

stanislav-tkach, chrysn, bhgomes, rwestphal, sffc and 5 more

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