Miss Dada  🏳️‍⚧️

ok cool the hash_map::Entry interface lets you insert things into a hashmap and return a ref to them, which HashMap::insert() does not allow since it takes ownership of the key and value

does Entry use unsafe code to do this? or is it just organising the mutation logic differently lets it update the hashmap and then give you a ref back

you can imagine that almost all of the HashMap API is built on the Entry type (some actually is, but can't remember which) which itself may be built on a lower-level RawEntry most of the logic lives at a nice distance from unsafe code, you should pick @Gankro's brains on this!

there seems to be confusion here. insert returns any old value that would otherwise be overwritten. The Entry API you’re looking at returns a reference to the newly inserted element.