std::collections::hash_map::RandomState - Rust
Description: API documentation for the Rust `RandomState` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, RandomState

# 1.7.0[−][src]Struct std::collections::hash_map::RandomState

    pub struct RandomState { /* fields omitted */ }

`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

### `impl RandomState`[src]

#### `pub fn new() -> RandomState`[src]

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

# Examples

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

    let s = RandomState::new();

Run

## Trait Implementations

### `impl BuildHasher for RandomState`[src]

#### `type Hasher = DefaultHasher`

Type of the hasher that will be created.

#### `fn build_hasher(&self) -> DefaultHasher`[src]

Creates a new hasher. Read more

### `impl Clone for RandomState`[src]

#### `fn clone(&self) -> RandomState`[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl Debug for RandomState` 1.16.0[src]

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

Formats the value using the given formatter. Read more

### `impl Default for RandomState`[src]

#### `fn default() -> RandomState`[src]

Constructs a new `RandomState`.

## Auto Trait Implementations

### `impl RefUnwindSafe for RandomState`

### `impl Send for RandomState`

### `impl Sync for RandomState`

### `impl Unpin for RandomState`

### `impl UnwindSafe for RandomState`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &Tⓘ

### Notable traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut Tⓘ

### Notable traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`[src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T`[src]

#### `pub fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U`[src]

Performs the conversion.

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `pub fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `pub fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.