Struct NoopU64Hasher 

pub struct NoopU64Hasher(/* private fields */);

A no-op hasher that writes u64 values directly to the internal state.

In some cases, pre-hashed values (u64) may be used as the key to a hash table or similar data structure. In those cases, re-hashing the key each time is unnecessary and potentially even undesirable.

NoopU64Hasher is a hash implementation that simply forwards u64 values to the internal state and uses that as the final hashed value. It can used to hash a u64 value directly, or to hash a value that wraps a u64 value, such as a newtype (e.g., struct HashKey(u64)).

Behavior

NoopU64Hasher stores a single u64 value internally. The last value written via write_u64 is the final hash value. Writing any other value type to the hasher will panic.

Trait Implementations

impl Default for NoopU64Hasher

fn default() -> NoopU64Hasher

Returns the “default value” for a type.

impl Hasher for NoopU64Hasher

fn finish(&self) -> u64

Returns the hash value for the values written so far.

fn write_u64(&mut self, i: u64)

Writes a single u64 into this hasher.

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

Writes some data into this Hasher.

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_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.