Struct AllocPolicy256 

pub struct AllocPolicy256;

Entity allocation policy for chunks of size 256.

Trait Implementations

impl IAllocPolicy for AllocPolicy256

const CHUNK_SIZE_LOG2: usize = 8

Chunk size log2 (e.g., 7 for 128, 8 for 256, etc.)

const CHUNK_SIZE: usize

Chunk size (e.g., 128, 256, etc.)

const BITSET_LEN: usize

Bitset length (number of u64 units in the bitset)

const UNIT_ID_MASK: usize

Unit ID mask, usually CHUNK_SIZE - 1

type BitAlloc = BitAlloc<4>

Bit allocator type. MTB::Entity chooses different bit allocators for different chunk sizes.

type Units<E> = [Unit<E>; 256]

Unit array type for the chunk.

fn compose(chunk: u32, unit: u16, generation: NonZeroU16) -> GenIndex

Compose a GenIndex from chunk ID, unit ID, and generation.

fn chunkof_real(real_index: usize) -> u32

Extract chunk ID from a real index.

fn chunk(index: GenIndex) -> u32

Extract chunk ID from a GenIndex.

fn unitof_real(real_index: usize) -> u16

Extract unit ID from a real index.

fn unit(index: GenIndex) -> u16

Extract unit ID from a GenIndex.

fn tear(index: GenIndex) -> (u32, u16, NonZeroU16)

Tear down a GenIndex into chunk ID, unit ID, and generation.