Struct RandomState 

pub struct RandomState<T: FastHash> { /* private fields */ }

RandomState provides the default state for HashMap or HashSet types.

A particular instance RandomState will create the same instances of Hasher, but the hashers created by two different RandomState instances are unlikely to produce the same result for the same values.

use std::collections::HashMap;

use fasthash::RandomState;
use fasthash::city::Hash64;

let s = RandomState::<Hash64>::new();
let mut map = HashMap::with_hasher(s);

assert_eq!(map.insert(37, "a"), None);
assert_eq!(map.is_empty(), false);

map.insert(37, "b");
assert_eq!(map.insert(37, "c"), Some("b"));
assert_eq!(map[&37], "c");

Implementations

impl<T: FastHash> RandomState<T>

pub fn new() -> Self

Constructs a new RandomState that is initialized with random keys.

Trait Implementations

impl<T: FastHash> BuildHasher for RandomState<T>

type Hasher = <T as BuildHasherExt>::FastHasher

Type of the hasher that will be created.

fn build_hasher(&self) -> Self::Hasher

Creates a new hasher.

fn hash_one<T>(&self, x: T) -> u64

where T: Hash, Self: Sized, Self::Hasher: Hasher,

Calculates the hash of a single value.

impl<T: Clone + FastHash> Clone for RandomState<T>

fn clone(&self) -> RandomState<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: FastHash> Default for RandomState<T>

fn default() -> Self

Returns the “default value” for a type.