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/Rust

Struct RandomState 

pub struct RandomState { /* private fields */ }

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

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impl RandomState
1.7.0Source
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

1.7.0Source
impl BuildHasher for RandomState
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type Hasher = DefaultHasher
Type of the hasher that will be created.
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fn build_hasher(&self) -> DefaultHasher
Creates a new hasher. Read more
1.71.0Source
fn hash_one<T>(&self, x: T) -> u64where
    T: Hash,
    Self: Sized,
    Self::Hasher: Hasher,
Calculates the hash of a single value. Read more
1.7.0Source
impl Clone for RandomState
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fn clone(&self) -> RandomState
Returns a duplicate of the value. Read more
1.0.0Source
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source. Read more
1.16.0Source
impl Debug for RandomState
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fn fmt(&self, f: &mut Formatter<'_>) -> Result
Formats the value using the given formatter. Read more
1.7.0Source
impl Default for RandomState
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fn default() -> RandomState

Constructs a new RandomState.

Auto Trait Implementations

impl Freeze for RandomState
impl RefUnwindSafe for RandomState
impl Send for RandomState
impl Sync for RandomState
impl Unpin for RandomState
impl UnwindSafe for RandomState

Blanket Implementations

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impl<T> Any for Twhere
    T: 'static + ?Sized,
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fn type_id(&self) -> TypeId
Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere
    T: ?Sized,
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fn borrow(&self) -> &T
Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere
    T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for Twhere
    T: Clone,
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unsafe fn clone_to_uninit(&self, dest: *mut u8)
🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T
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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere
    U: From<T>,
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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere
    T: Clone,
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type Owned = T
The resulting type after obtaining ownership.
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fn to_owned(&self) -> T
Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)
Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere
    U: Into<T>,
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type Error = Infallible
The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
Performs the conversion.
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impl<T, U> TryInto<U> for Twhere
    U: TryFrom<T>,
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type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
Performs the conversion.

© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/hash/struct.RandomState.html