Struct FastHasher 

pub struct FastHasher { /* private fields */ }

A fast, non-cryptographic hasher for the decoder’s maps.

Every field read during validation and every element lookup goes through a String-keyed map, and std’s SipHash made those lookups a measurable share of a validation run. This is the multiply-rotate scheme of FxHash (as in rustc-hash 2): a word at a time, with the high bits rotated down at the end because hashbrown takes its bucket index from the low bits.

Written out rather than imported so the core crates carry no dependency for it. Not resistant to deliberately colliding keys, which is acceptable for a tool that reads grid model files rather than serving untrusted requests.

Trait Implementations

impl Clone for FastHasher

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FastHasher

impl Default for FastHasher

fn default() -> Self

Returns the “default value” for a type.

impl Hasher for FastHasher

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_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_usize(&mut self, i: usize)

Writes a single usize into this hasher.

fn finish(&self) -> u64

Returns the hash value for the values written so far.

fn write_u16(&mut self, i: u16)

Writes a single u16 into this hasher.

fn write_u128(&mut self, i: u128)

Writes a single u128 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.