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use core::borrow::Borrow; /// Key equivalence trait. /// /// This trait allows hash table lookup to be customized. /// It has one blanket implementation that uses the regular `Borrow` solution, /// just like `HashMap` and `BTreeMap` do, so that you can pass `&str` to lookup /// into a map with `String` keys and so on. /// /// # Contract /// /// The implementor **must** hash like `K`, if it is hashable. pub trait Equivalent<K: ?Sized> { /// Compare self to `key` and return `true` if they are equal. fn equivalent(&self, key: &K) -> bool; } impl<Q: ?Sized, K: ?Sized> Equivalent<K> for Q where Q: Eq, K: Borrow<Q>, { #[inline] fn equivalent(&self, key: &K) -> bool { *self == *key.borrow() } }