Struct ahash::RandomState
source · [−]pub struct RandomState { /* private fields */ }
Expand description
Implementations
sourceimpl RandomState
impl RandomState
sourcepub fn set_random_source(
source: impl RandomSource + Send + Sync + 'static
) -> Result<(), bool>
pub fn set_random_source(
source: impl RandomSource + Send + Sync + 'static
) -> Result<(), bool>
Provides an optional way to manually supply a source of randomness for Hasher keys.
The provided [RandomSource] will be used to be used as a source of randomness by RandomState to generate new states. If this method is not invoked the standard source of randomness is used as described in the Readme.
The source of randomness can only be set once, and must be set before the first RandomState is created.
If the source has already been specified Err
is returned with a bool
indicating if the set failed because
method was previously invoked (true) or if the default source is already being used (false).
sourcepub fn new() -> RandomState
pub fn new() -> RandomState
Use randomly generated keys
sourcepub fn generate_with(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState
pub fn generate_with(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState
Allows for supplying seeds, but each time it is called the resulting state will be different. This is done using a static counter, so it can safely be used with a fixed keys.
sourcepub fn with_seed(key: usize) -> RandomState
pub fn with_seed(key: usize) -> RandomState
Allows for explicitly setting a seed to used.
Note: This method does not require the provided seed to be strong.
sourcepub const fn with_seeds(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState
pub const fn with_seeds(k0: u64, k1: u64, k2: u64, k3: u64) -> RandomState
Allows for explicitly setting the seeds to used.
Note: This method is robust against 0s being passed for one or more of the parameters or the same value being passed for more than one parameter.
Trait Implementations
sourceimpl BuildHasher for RandomState
impl BuildHasher for RandomState
sourcefn build_hasher(&self) -> AHasher
fn build_hasher(&self) -> AHasher
Constructs a new AHasher with keys based on this RandomState object. This means that two different RandomStates will will generate AHashers that will return different hashcodes, but Hashers created from the same BuildHasher will generate the same hashes for the same input data.
Examples
use ahash::{AHasher, RandomState};
use std::hash::{Hasher, BuildHasher};
let build_hasher = RandomState::new();
let mut hasher_1 = build_hasher.build_hasher();
let mut hasher_2 = build_hasher.build_hasher();
hasher_1.write_u32(1234);
hasher_2.write_u32(1234);
assert_eq!(hasher_1.finish(), hasher_2.finish());
let other_build_hasher = RandomState::new();
let mut different_hasher = other_build_hasher.build_hasher();
different_hasher.write_u32(1234);
assert_ne!(different_hasher.finish(), hasher_1.finish());
sourceimpl Clone for RandomState
impl Clone for RandomState
sourcefn clone(&self) -> RandomState
fn clone(&self) -> RandomState
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for RandomState
impl Debug for RandomState
Auto Trait Implementations
impl RefUnwindSafe for RandomState
impl Send for RandomState
impl Sync for RandomState
impl Unpin for RandomState
impl UnwindSafe for RandomState
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ToOwned for T where
T: Clone,
impl<T> ToOwned for T where
T: Clone,
type Owned = T
type Owned = T
The resulting type after obtaining ownership.
sourcefn clone_into(&self, target: &mut T)
fn clone_into(&self, target: &mut T)
toowned_clone_into
)Uses borrowed data to replace owned data, usually by cloning. Read more