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 on a byte slice longer than size_of::<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, 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_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.