# Struct std::collections::hash_map::DefaultHasher

1.13.0 · source ·

    pub struct DefaultHasher(/* private fields */);

Expand description

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.

## Implementations§

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### impl DefaultHasher

const: unstable · source

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

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§

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### impl Clone for DefaultHasher

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

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 DefaultHasher

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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 DefaultHasher

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#### fn default() -> DefaultHasher

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

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### impl Hasher for DefaultHasher

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

Writes some data into this `Hasher`. Read more
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#### fn write_str(&mut self, s: &str)

🔬This is a nightly-only experimental API. (`hasher_prefixfree_extras` #96762)
Writes a single `str` into this hasher. Read more
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#### fn finish(&self) -> u64

Returns the hash value for the values written so far. Read more
1.3.0 · source§

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

Writes a single `u8` into this hasher.
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#### fn write_u16(&mut self, i: u16)

Writes a single `u16` into this hasher.
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#### fn write_u32(&mut self, i: u32)

Writes a single `u32` into this hasher.
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#### fn write_u64(&mut self, i: u64)

Writes a single `u64` into this hasher.
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#### fn write_u128(&mut self, i: u128)

Writes a single `u128` into this hasher.
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#### fn write_usize(&mut self, i: usize)

Writes a single `usize` into this hasher.
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#### fn write_i8(&mut self, i: i8)

Writes a single `i8` into this hasher.
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#### fn write_i16(&mut self, i: i16)

Writes a single `i16` into this hasher.
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#### fn write_i32(&mut self, i: i32)

Writes a single `i32` into this hasher.
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#### fn write_i64(&mut self, i: i64)

Writes a single `i64` into this hasher.
1.26.0 · source§

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

Writes a single `i128` into this hasher.
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#### fn write_isize(&mut self, i: isize)

Writes a single `isize` into this hasher.
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#### fn write_length_prefix(&mut self, len: usize)

🔬This is a nightly-only experimental API. (`hasher_prefixfree_extras` #96762)
Writes a length prefix into this hasher, as part of being prefix-free. Read more

## Auto Trait Implementations§

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### impl RefUnwindSafe for DefaultHasher

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### impl Send for DefaultHasher

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### impl Sync for DefaultHasher

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### impl Unpin for DefaultHasher

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### impl UnwindSafe for DefaultHasher

## 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.