maybe expose a way to pass pre-calculated hashes along with hash table keys

[steveklabnik]

Issue by thestinger
Tuesday Nov 26, 2013 at 03:05 GMT

For earlier discussion, see rust-lang/rust#10661

This issue was labelled with: A-libs, I-enhancement, I-slow in the Rust repository

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I found this was necessarily to avoid double-hashing with a shard-based concurrent hash table like Java's ConcurrentHashMap as the hash needs to be calculated to pick the correct shard.

https://github.com/thestinger/rust-core/blob/master/core/concurrent.rs#L299

This could be done by hoisting out the open-addressing implementation, but it will result in it requiring the hashes to be stored in the table rather than it just being an implementation detail.

[ticki]

This should be possible with the landing of const fn.