# Struct std::collections::hash_map::RandomState

1.7.0 · source ·

    pub struct RandomState { /* private fields */ }

Expand description

`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::collections::hash_map::RandomState;

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

Run

## Implementations§

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### impl RandomState

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#### pub fn new() -> RandomState

Constructs a new `RandomState` that is initialized with random keys.

##### Examples

    use std::collections::hash_map::RandomState;

    let s = RandomState::new();

Run

## Trait Implementations§

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### 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
1.71.0 · source§

#### fn hash_one<T>(&self, x: T) -> u64 where T: Hash, Self: Sized, Self::Hasher: Hasher,

Calculates the hash of a single value. Read more
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### impl Clone for RandomState

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#### fn clone(&self) -> RandomState

Returns a copy of the value. Read more
1.0.0 · source§

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

Performs copy-assignment from `source`. Read more
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### impl Debug for RandomState

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

Formats the value using the given formatter. Read more
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### impl Default for RandomState

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#### fn default() -> RandomState

Constructs a new `RandomState`.

## Auto Trait Implementations§

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### impl RefUnwindSafe for RandomState

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### impl Send for RandomState

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### impl Sync for RandomState

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### impl Unpin for RandomState

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### 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> 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.