Struct RandomState

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pub struct RandomState<T: FastHash> { /* private fields */ }
Expand description

RandomState provides the default state for HashMap or HashSet 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.

use std::collections::HashMap;

use fasthash::RandomState;
use fasthash::city::Hash64;

let s = RandomState::<Hash64>::new();
let mut map = HashMap::with_hasher(s);

assert_eq!(map.insert(37, "a"), None);
assert_eq!(map.is_empty(), false);

map.insert(37, "b");
assert_eq!(map.insert(37, "c"), Some("b"));
assert_eq!(map[&37], "c");

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impl<T: FastHash> RandomState<T>

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pub fn new() -> Self

Constructs a new RandomState that is initialized with random keys.

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impl<T: FastHash> BuildHasher for RandomState<T>

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type Hasher = <T as BuildHasherExt>::FastHasher

Type of the hasher that will be created.
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fn build_hasher(&self) -> Self::Hasher

Creates a new hasher. Read more
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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<T: Clone + FastHash> Clone for RandomState<T>

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fn clone(&self) -> RandomState<T>

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: FastHash> Default for RandomState<T>

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<T> Freeze for RandomState<T>

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impl<T> RefUnwindSafe for RandomState<T>
where T: RefUnwindSafe,

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impl<T> Send for RandomState<T>
where T: Send,

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impl<T> Sync for RandomState<T>
where T: Sync,

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impl<T> Unpin for RandomState<T>
where T: Unpin,

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impl<T> UnwindSafe for RandomState<T>
where T: UnwindSafe,

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impl<T> Any for T
where 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 T
where 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 T
where 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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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 T
where 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 T
where 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 T
where 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 T
where 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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V