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Stabilize or_insert_with_key by ChaiTRex · Pull Request #78083 · rust-lang/rust...
source link: https://github.com/rust-lang/rust/pull/78083
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Stabilizes the or_insert_with_key feature from #71024. This allows inserting key-derived values when a HashMap/BTreeMap entry is vacant.
The difference between this and .or_insert_with(|| ... ) is that this provides a reference to the key to the closure after it is moved with .entry(key_being_moved), avoiding the need to copy or clone the key.
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