Struct bevy_ecs::entity::EntityHasher

pub struct EntityHasher { /* private fields */ }

A very fast hash that is only designed to work on generational indices like Entity. It will panic if attempting to hash a type containing non-u64 fields.

This is heavily optimized for typical cases, where you have mostly live entities, and works particularly well for contiguous indices.

If you have an unusual case – say all your indices are multiples of 256 or most of the entities are dead generations – then you might want also to try AHasher for a slower hash computation but fewer lookup conflicts.

Trait Implementations

impl Debug for EntityHasher

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EntityHasher

fn default() -> EntityHasher

Returns the “default value” for a type.

impl Hasher for EntityHasher

fn finish(&self) -> u64

Returns the hash value for the values written so far.

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

Writes some data into this Hasher.

fn write_u64(&mut self, bits: u64)

Writes a single u64 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.