Trait std::hash::BuildHasher 1.7.0
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pub trait BuildHasher {
type Hasher: Hasher;
fn build_hasher(&self) -> Self::Hasher;
}A trait for creating instances of Hasher.
A BuildHasher is typically used (e.g. by HashMap) to create
Hashers for each key such that they are hashed independently of one
another, since Hashers contain state.
For each instance of BuildHasher, the Hashers created by
build_hasher should be identical. That is, if the same stream of bytes
is fed into each hasher, the same output will also be generated.
Examples
use std::collections::hash_map::RandomState; use std::hash::{BuildHasher, Hasher}; let s = RandomState::new(); let mut hasher_1 = s.build_hasher(); let mut hasher_2 = s.build_hasher(); hasher_1.write_u32(8128); hasher_2.write_u32(8128); assert_eq!(hasher_1.finish(), hasher_2.finish());Run
Associated Types
Required Methods
fn build_hasher(&self) -> Self::Hasher
Implementors
impl<H> BuildHasher for BuildHasherDefault<H> where
H: Default + Hasher,impl BuildHasher for RandomState