# 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`

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####

`pub fn new() -> DefaultHasher`

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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 Debug for DefaultHasher`

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####

`fn fmt(&self, f: &mut Formatter) -> Result`

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Formats the value using the given formatter. Read more

###

`impl Hasher for DefaultHasher`

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####

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

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Writes some data into this `Hasher`. Read more

####

`fn finish(&self) -> u64`

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

####

`fn write_u8(&mut self, i: u8)`

1.3.0
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Writes a single `u8` into this hasher.

####

`fn write_u16(&mut self, i: u16)`

1.3.0
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Writes a single `u16` into this hasher.

####

`fn write_u32(&mut self, i: u32)`

1.3.0
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Writes a single `u32` into this hasher.

####

`fn write_u64(&mut self, i: u64)`

1.3.0
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Writes a single `u64` into this hasher.

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`fn write_u128(&mut self, i: u128)`

1.26.0
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Writes a single `u128` into this hasher.

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`fn write_usize(&mut self, i: usize)`

1.3.0
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Writes a single `usize` into this hasher.

####

`fn write_i8(&mut self, i: i8)`

1.3.0
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Writes a single `i8` into this hasher.

####

`fn write_i16(&mut self, i: i16)`

1.3.0
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Writes a single `i16` into this hasher.

####

`fn write_i32(&mut self, i: i32)`

1.3.0
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Writes a single `i32` into this hasher.

####

`fn write_i64(&mut self, i: i64)`

1.3.0
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Writes a single `i64` into this hasher.

####

`fn write_i128(&mut self, i: i128)`

1.26.0
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Writes a single `i128` into this hasher.

####

`fn write_isize(&mut self, i: isize)`

1.3.0
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Writes a single `isize` into this hasher.

###

`impl Clone for DefaultHasher`

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####

`fn clone(&self) -> DefaultHasher`

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Returns a copy of the value. Read more

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

1.0.0
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Performs copy-assignment from `source`. Read more

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`impl Default for DefaultHasher`

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####

`fn default() -> DefaultHasher`

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

## Auto Trait Implementations

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`impl Send for DefaultHasher`

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`impl Sync for DefaultHasher`

## Blanket Implementations

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`impl<T, U> TryFrom for T where T: From<U>,`

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#### `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>`

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

Performs the conversion.

###

`impl<T> From for T`

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####

`fn from(t: T) -> T`

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Performs the conversion.

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

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#### `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>`

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

Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

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####

`fn into(self) -> U`

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Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

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####
ⓘ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`

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Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

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####
ⓘ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`

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Mutably borrows from an owned value. Read more

###

`impl<T> Any for T where T: 'static + ?Sized,`

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####

`fn get_type_id(&self) -> TypeId`

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🔬 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,`

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#### `type Owned = T`

####

`fn to_owned(&self) -> T`

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

####

`fn clone_into(&self, target: &mut T)`

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🔬 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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