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use std::hash::Hasher;
use std::collections::hash_state::HashState;
use mmh3_32::murmurhash3_x86_32;
pub struct Murmur3Hasher {
seed: u32,
bytes: Vec<u8>,
}
#[derive(Clone, Copy)]
pub struct Murmur3HashState {
seed: u32,
}
impl Murmur3HashState {
pub fn new() -> Murmur3HashState {
return Murmur3HashState { seed: 0 };
}
pub fn with_seed(seed: u32) -> Murmur3HashState {
return Murmur3HashState { seed: seed };
}
}
impl Hasher for Murmur3Hasher {
fn finish(&self) -> u64 {
return murmurhash3_x86_32(&self.bytes, self.seed) as u64;
}
fn write(&mut self, bytes: &[u8]) {
self.bytes.push_all(bytes);
}
}
impl HashState for Murmur3HashState {
type Hasher = Murmur3Hasher;
fn hasher(&self) -> Murmur3Hasher {
return Murmur3Hasher { seed: self.seed, bytes: vec![] };
}
}
#[cfg(test)]
mod test {
use super::Murmur3HashState;
use std::collections::hash_map::HashMap;
#[test]
fn use_in_hashmap() {
let mut hashmap = HashMap::with_hash_state(Murmur3HashState::new());
hashmap.insert("one", 1);
hashmap.insert("two", 2);
assert!(hashmap.len() == 2);
assert!(*hashmap.get("one").unwrap() == 1);
assert!(*hashmap.get("two").unwrap() == 2);
}
}