Struct TypeIdHasher

pub struct TypeIdHasher { /* private fields */ }

A hasher designed to eke a little more speed out, given TypeId’s known characteristics.

Specifically, this is a no-op hasher that expects to be fed a u64’s worth of randomly-distributed bits. It works well for TypeId (eliminating start-up time, so that my get_missing benchmark is ~30ns rather than ~900ns, and being a good deal faster after that, so that my insert_and_get_on_260_types benchmark is ~12μs instead of ~21.5μs), but will panic in debug mode and always emit zeros in release mode for any other sorts of inputs, so yeah, don’t use it! 😀

Trait Implementations

impl Default for TypeIdHasher

fn default() -> TypeIdHasher

Returns the “default value” for a type.

impl Hasher for TypeIdHasher

fn write(&mut self, bytes: &[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.