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

# 1.13.0[−][src]Struct std::collections::hash_map::DefaultHasher

    pub struct DefaultHasher(_);

The default `Hasher` used by `RandomState`.

The internal algorithm is not specified, and so it and its hashes should not be relied upon over releases.

## Methods

### `impl DefaultHasher`[src]

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

Creates a new `DefaultHasher`.

This hasher is not guaranteed to be the same as all other `DefaultHasher` instances, but is the same as all other `DefaultHasher` instances created through `new` or `default`.

## Trait Implementations

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

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

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

Formats the value using the given formatter. Read more

### `impl Hasher for DefaultHasher`[src]

#### `fn write(&mut self, msg: &[u8])`[src]

Writes some data into this `Hasher`. Read more

#### `fn finish(&self) -> u64`[src]

Returns the hash value for the values written so far. Read more

#### `fn write_u8(&mut self, i: u8)`
1.3.0
[src]

Writes a single `u8` into this hasher.

#### `fn write_u16(&mut self, i: u16)`
1.3.0
[src]

Writes a single `u16` into this hasher.

#### `fn write_u32(&mut self, i: u32)`
1.3.0
[src]

Writes a single `u32` into this hasher.

#### `fn write_u64(&mut self, i: u64)`
1.3.0
[src]

Writes a single `u64` into this hasher.

#### `fn write_u128(&mut self, i: u128)`
1.26.0
[src]

Writes a single `u128` into this hasher.

#### `fn write_usize(&mut self, i: usize)`
1.3.0
[src]

Writes a single `usize` into this hasher.

#### `fn write_i8(&mut self, i: i8)`
1.3.0
[src]

Writes a single `i8` into this hasher.

#### `fn write_i16(&mut self, i: i16)`
1.3.0
[src]

Writes a single `i16` into this hasher.

#### `fn write_i32(&mut self, i: i32)`
1.3.0
[src]

Writes a single `i32` into this hasher.

#### `fn write_i64(&mut self, i: i64)`
1.3.0
[src]

Writes a single `i64` into this hasher.

#### `fn write_i128(&mut self, i: i128)`
1.26.0
[src]

Writes a single `i128` into this hasher.

#### `fn write_isize(&mut self, i: isize)`
1.3.0
[src]

Writes a single `isize` into this hasher.

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

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

Creates a new `DefaultHasher` using `new`. See its documentation for more.

## Auto Trait Implementations

### `impl Send for DefaultHasher`

### `impl Sync for DefaultHasher`

## Blanket Implementations

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

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

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

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

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

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

Performs the conversion.

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

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

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

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

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

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

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

Performs the conversion.

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

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

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

####
ⓘImportant traits for &'_ mut I

### Important traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

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

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

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

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

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

#### `type Owned = T`

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

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

#### `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

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