Trait std::collections::hash_state::HashState [] [src]

pub trait HashState {
    type Hasher: Hasher;
    fn hasher(&self) -> Self::Hasher;
}
Unstable

: hasher stuff is unclear

A trait representing stateful hashes which can be used to hash keys in a HashMap`HashMap`.

A HashState is used as a factory for instances of Hasher`Hasherwhich a` which a HashMap`HashMapcan then use to hash keys independently. A` can then use to hash keys independently. A HashMap`HashMapby default uses a state which will create instances of a` by default uses a state which will create instances of a SipHasher`SipHasher, but a custom state factory can be provided to the`, but a custom state factory can be provided to the with_hash_state`with_hash_state` function.

If a hashing algorithm has no initial state, then the Hasher`Hashertype for that algorithm can implement the` type for that algorithm can implement the Default`Defaulttrait and create hash maps with the` trait and create hash maps with the DefaultState`DefaultStatestructure. This state is 0-sized and will simply delegate to` structure. This state is 0-sized and will simply delegate to Default`Default` when asked to create a hasher.

Associated Types

type Hasher: Hasher

Unstable

: hasher stuff is unclear

Type of the hasher that will be created.

Required Methods

fn hasher(&self) -> Self::Hasher

Unstable

: hasher stuff is unclear

Creates a new hasher based on the given state of this object.

Implementors