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Add a function to get the key from a HashMap #43143
Description
Basically just
pub fn get_both<Q: ?Sized>(&self, k: &Q) -> Option<(&K,&V)>
where K: Borrow<Q>,
Q: Hash + Eq
{
self.search(k).into_occupied_bucket().map(|bucket| bucket.into_refs())
}
sometimes you need a reference to a key with the lifetime of the collection.
Activity
oli-obk commentedon Jul 10, 2017
If
OccupiedEntry::keyreturned the reference with the proper lifetime, we could already do this in usercode.iqualfragile commentedon Jul 10, 2017
@oli-obk the entry api would not work, because it requires &mut, this usecase would require the ability to have multiple references and therefore just &
dtolnay commentedon Nov 19, 2017
I don't love the name
get_bothbut I agree that this is basic functionality that HashMap should expose. I would welcome a PR and we can refine the name separately.Rollup merge of rust-lang#49346 - Diggsey:hashmap-get-pair, r=Mark-Si…
Rollup merge of rust-lang#49346 - Diggsey:hashmap-get-pair, r=Mark-Si…