pub struct AHasher { /* private fields */ }
Expand description
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.
Trait Implementations§
Source§impl Default for AHasher
Provides a default Hasher with fixed keys.
This is typically used in conjunction with BuildHasherDefault to create
AHashers in order to hash the keys of the map.
impl Default for AHasher
Provides a default Hasher with fixed 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 desirable 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);
Source§fn default() -> AHasher
fn default() -> AHasher
Constructs a new AHasher with fixed keys.
If std
is enabled these will be generated upon first invocation.
Otherwise if the compile-time-rng
feature is enabled these will be generated at compile time.
If neither of these features are available, hardcoded constants will be used.
Because the values are fixed, different hashers will all hash elements the same way. This could make hash values predictable, if DOS attacks are a concern. If this behaviour is not required, it may be preferable to use RandomState instead.
§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());
Source§impl Hasher for AHasher
Provides Hasher methods to hash all of the primitive types.
impl Hasher for AHasher
Provides Hasher methods to hash all of the primitive types.
Source§fn write_u128(&mut self, i: u128)
fn write_u128(&mut self, i: u128)
u128
into this hasher.Source§fn write_usize(&mut self, i: usize)
fn write_usize(&mut self, i: usize)
usize
into this hasher.1.26.0 · Source§fn write_i128(&mut self, i: i128)
fn write_i128(&mut self, i: i128)
i128
into this hasher.1.3.0 · Source§fn write_isize(&mut self, i: isize)
fn write_isize(&mut self, i: isize)
isize
into this hasher.Source§fn write_length_prefix(&mut self, len: usize)
fn write_length_prefix(&mut self, len: usize)
hasher_prefixfree_extras
)