Struct ahash::ABuildHasher

pub struct ABuildHasher { /* fields omitted */ }

Provides a Hasher factory. This is typically used (e.g. by [HashMap]) to create [AHasher]s in order to hash the keys of the map. See build_hasher below.

Methods

impl ABuildHasher

pub fn new() -> ABuildHasher

Trait Implementations

impl BuildHasher for ABuildHasher

type Hasher = AHasher

Type of the hasher that will be created.

fn build_hasher(&self) -> AHasher

Constructs a new [AHasher] with keys based on compile time generated constants and the location of the this object in memory. This means that two different BuildHashers will will generate [AHasher]s that will return different hashcodes, but Hashers created from the same BuildHasher will generate the same hashes for the same input data.

Examples

use ahash::{AHasher, ABuildHasher};
use std::hash::{Hasher, BuildHasher};

let build_hasher = ABuildHasher::new();
let mut hasher_1 = build_hasher.build_hasher();
let mut hasher_2 = build_hasher.build_hasher();

hasher_1.write_u32(1234);
hasher_2.write_u32(1234);

assert_eq!(hasher_1.finish(), hasher_2.finish());

let other_build_hasher = ABuildHasher::new();
let mut different_hasher = other_build_hasher.build_hasher();
different_hasher.write_u32(1234);
assert_ne!(different_hasher.finish(), hasher_1.finish());

impl Clone for ABuildHasher

fn clone(&self) -> ABuildHasher

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Default for ABuildHasher

fn default() -> Self

Returns the "default value" for a type.