[][src]Struct ahash::AHasher

pub struct AHasher { /* fields omitted */ }

A Hasher for hashing an arbitrary stream of bytes.

Instances of AHasher represent state that is updated while hashing data.

Each method updates the internal state based on the new data provided. Once all of the data has been provided, the resulting hash can be obtained by calling finish()

Clone is also provided in case you wish to calculate hashes for two different items that start with the same data.

Implementations

impl AHasher[src]

pub fn new_with_keys(key1: u128, key2: u128) -> Self[src]

Creates a new hasher keyed to the provided keys.

Normally hashers are created via AHasher::default() for fixed keys or RandomState::new() for randomly generated keys and RandomState::with_seeds(a,b) for seeds that are set and can be reused. All of these work at map creation time (and hence don't have any overhead on a per-item bais).

This method directly creates the hasher instance and performs no transformation on the provided seeds. This may be useful where a HashBuilder is not desired, such as for testing purposes.

Example

use std::hash::Hasher;
use ahash::AHasher;

let mut hasher = AHasher::new_with_keys(1234, 5678);

hasher.write_u32(1989);
hasher.write_u8(11);
hasher.write_u8(9);
hasher.write(b"Huh?");

println!("Hash is {:x}!", hasher.finish());

Trait Implementations

impl Clone for AHasher[src]

impl Debug for AHasher[src]

impl Default for AHasher[src]

Provides a default Hasher compile time generated constants for keys. This is typically used in conjunction with BuildHasherDefault to create AHashers in order to hash the keys of the map.

Generally it is preferable to use RandomState instead, so that different hashmaps will have different keys. However if fixed keys are desireable this may be used instead.

Example

use std::hash::BuildHasherDefault;
use ahash::{AHasher, RandomState};
use std::collections::HashMap;

let mut map: HashMap<i32, i32, BuildHasherDefault<AHasher>> = HashMap::default();
map.insert(12, 34);

fn default() -> AHasher[src]

Constructs a new AHasher with compile time generated constants for keys if the compile-time-rngfeature is enabled. Otherwise the keys will be fixed constants. This means the keys will be the same from one instance to another, but different from build to the next. So if it is possible for a potential attacker to have access to the compiled binary it would be better to specify keys generated at runtime.

Examples

use ahash::AHasher;
use std::hash::Hasher;

let mut hasher_1 = AHasher::default();
let mut hasher_2 = AHasher::default();

hasher_1.write_u32(1234);
hasher_2.write_u32(1234);

assert_eq!(hasher_1.finish(), hasher_2.finish());

impl Hasher for AHasher[src]

Provides methods to hash all of the primitive types.

Auto Trait Implementations

impl RefUnwindSafe for AHasher

impl Send for AHasher

impl Sync for AHasher

impl Unpin for AHasher

impl UnwindSafe for AHasher

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> From<T> for T[src]

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

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.