Struct RandomState

pub struct RandomState { /* private fields */ }

Available on crate feature map only.

RandomState is the default state for HashMap 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.

Examples

use std::collections::HashMap;
use std::hash::RandomState;

let s = RandomState::new();
let mut map = HashMap::with_hasher(s);
map.insert(1, 2);

Implementations

impl RandomState

pub fn new() -> RandomState

Constructs a new RandomState that is initialized with random keys.

Examples

use std::hash::RandomState;

let s = RandomState::new();

Trait Implementations

impl Arbitrary for RandomState

type Parameters = ()

The type of parameters that arbitrary_with accepts for configuration of the generated Strategy. Parameters must implement Default.

type Strategy = LazyJust<RandomState, fn() -> RandomState>

The type of Strategy used to generate values of type Self.

fn arbitrary_with( _args: <RandomState as Arbitrary>::Parameters, ) -> <RandomState as Arbitrary>::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self). The strategy is passed the arguments given in args.

fn arbitrary() -> Self::Strategy

Generates a Strategy for producing arbitrary values of type the implementing type (Self).

impl BuildHasher for RandomState

type Hasher = DefaultHasher

Type of the hasher that will be created.

fn build_hasher(&self) -> DefaultHasher

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 Clone for RandomState

fn clone(&self) -> RandomState

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RandomState

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for RandomState

fn default() -> RandomState

Constructs a new RandomState.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes