From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- third_party/rust/indexmap/src/equivalent.rs | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 third_party/rust/indexmap/src/equivalent.rs (limited to 'third_party/rust/indexmap/src/equivalent.rs') diff --git a/third_party/rust/indexmap/src/equivalent.rs b/third_party/rust/indexmap/src/equivalent.rs new file mode 100644 index 0000000000..ad6635ffac --- /dev/null +++ b/third_party/rust/indexmap/src/equivalent.rs @@ -0,0 +1,27 @@ +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 { + /// Compare self to `key` and return `true` if they are equal. + fn equivalent(&self, key: &K) -> bool; +} + +impl Equivalent for Q +where + Q: Eq, + K: Borrow, +{ + #[inline] + fn equivalent(&self, key: &K) -> bool { + *self == *key.borrow() + } +} -- cgit v1.2.3