darakian / nohash-hasher

NoHashHasher

A NoHashHasher<T> where T is one of {u8, u16, u32, u64, usize, i8, i16, i32, i64, isize} is a stateless implementation of std::hash::Hasher which does not actually hash at all.

By itself this hasher is largely useless, but when used in HashMaps whose domain matches T the resulting map operations involving hashing are faster than with any other possible hashing algorithm.

Using this hasher, one must ensure that it is never used in a stateful way, i.e. a single call to write_* must be followed by finish. Multiple write-calls will cause errors (debug builds check this and panic if a violation of this API contract is detected).

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.