Struct ahash::ABuildHasher

pub struct ABuildHasher { /* fields omitted */ }

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

Methods

impl ABuildHasher

pub fn new() -> ABuildHasher

Trait Implementations

impl Default for ABuildHasher

fn default() -> Self

Returns the "default value" for a type.

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 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 AHashers that will return different hashcodes, but Hashers created from the same BuildHasher will generate the same hashes for the same input data.

** - only if the compile-time-rng feature is enabled.

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());