Struct UintIdentity 

pub struct UintIdentity { /* private fields */ }

A “do-nothing” hasher for uint.

Most users typically store keys that are already hashed (shortened by the Translator). Re-hashing them with SipHash (by std::collections::HashMap) would waste CPU, so we give std::collections::HashMap this identity hasher instead:

• Hasher::write_u8, Hasher::write_u16, Hasher::write_u32, Hasher::write_u64 copies the input into an internal field;
• Hasher::finish returns that value unchanged.

Warning

This hasher is not suitable for general use. If the hasher is called over some type that is not u8, u16, u32 or u64, it will panic.

Trait Implementations

impl Clone for UintIdentity

fn clone(&self) -> UintIdentity

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for UintIdentity

fn default() -> UintIdentity

Returns the “default value” for a type.

impl Hasher for UintIdentity

fn write(&mut self, _: &[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_u64(&mut self, i: u64)

Writes a single u64 into this hasher.

fn finish(&self) -> u64

Returns the hash value for the values written so far.

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.