Struct Hasher

pub struct Hasher { /* private fields */ }

Available on crate feature xxhash32 only.

Calculates the 32-bit hash.

Caution

Although this struct implements hash::Hasher, it only calculates a 32-bit number, leaving the upper bits as 0. This means it is unlikely to be correct to use this in places like a HashMap.

Implementations

impl Hasher

pub fn oneshot(seed: u32, data: &[u8]) -> u32

Hash all data at once. If you can use this function, you may see noticable speed gains for certain types of input.

pub const fn with_seed(seed: u32) -> Self

Constructs the hasher with an initial seed.

pub const fn seed(&self) -> u32

The seed this hasher was created with.

pub const fn total_len(&self) -> u64

The total number of bytes hashed.

pub const fn total_len_32(&self) -> u32

The total number of bytes hashed, truncated to 32 bits.

For the full 64-bit byte count, use total_len.

pub fn finish_32(&self) -> u32

Returns the hash value for the values written so far. Unlike hash::Hasher::finish, this method returns the actual 32-bit value calculated, not a 64-bit value.

Trait Implementations

impl Clone for Hasher

fn clone(&self) -> Hasher

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Hasher

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Hasher

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Hasher

Available on crate feature serialize only.

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hasher for Hasher

fn write(&mut self, data: &[u8])

Writes some data into this Hasher.

fn finish(&self) -> u64

Returns the hash value for the values written so far.

fn write_u8(&mut self, i: u8)

Writes a single u8 into this hasher.

fn write_u16(&mut self, i: u16)

Writes a single u16 into this hasher.

fn write_u32(&mut self, i: u32)

Writes a single u32 into this hasher.

fn write_u64(&mut self, i: u64)

Writes a single u64 into this hasher.

fn write_u128(&mut self, i: u128)

Writes a single u128 into this hasher.

fn write_usize(&mut self, i: usize)

Writes a single usize into this hasher.

fn write_i8(&mut self, i: i8)

Writes a single i8 into this hasher.

fn write_i16(&mut self, i: i16)

Writes a single i16 into this hasher.

fn write_i32(&mut self, i: i32)

Writes a single i32 into this hasher.

fn write_i64(&mut self, i: i64)

Writes a single i64 into this hasher.

fn write_i128(&mut self, i: i128)

Writes a single i128 into this hasher.

fn write_isize(&mut self, i: isize)

Writes a single isize into this hasher.

fn write_length_prefix(&mut self, len: usize)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a length prefix into this hasher, as part of being prefix-free.

fn write_str(&mut self, s: &str)

🔬This is a nightly-only experimental API. (hasher_prefixfree_extras)

Writes a single str into this hasher.

impl PartialEq for Hasher

fn eq(&self, other: &Hasher) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Hasher

Available on crate feature serialize only.

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Hasher