Enum SizeClass 

#[repr(u8)]
pub enum SizeClass {
    Bytes8 = 0,
    Bytes16 = 1,
    Bytes32 = 2,
    Bytes64 = 3,
    Bytes128 = 4,
    Bytes256 = 5,
    Bytes512 = 6,
    Bytes1024 = 7,
    Bytes2048 = 8,
}

Fixed set of object sizes served by the slab allocator.

Variants

Bytes8 = 0

Bytes16 = 1

Bytes32 = 2

Bytes64 = 3

Bytes128 = 4

Bytes256 = 5

Bytes512 = 6

Bytes1024 = 7

Bytes2048 = 8

Implementations

impl SizeClass

pub const ALL: [SizeClass; 9]

All size classes in ascending order.

pub const COUNT: usize = SIZE_CLASS_COUNT

Number of distinct size classes.

pub fn from_layout(layout: Layout) -> Option<SizeClass>

Select the smallest size class that can satisfy layout.

Returns None if the requested size or alignment exceeds the slab’s capability.

pub const fn size(self) -> usize

Object size in bytes.

pub const fn index(self) -> usize

Array index (0-based).

pub const fn slab_pages(self, page_size: usize) -> usize

How many pages are needed for a single slab of this class.

Smaller classes use 1 page, larger classes may use more to amortise the per-page header overhead.

Trait Implementations

impl Clone for SizeClass

fn clone(&self) -> SizeClass

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SizeClass

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

Formats the value using the given formatter.

impl PartialEq for SizeClass

fn eq(&self, other: &SizeClass) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for SizeClass

impl Eq for SizeClass

impl StructuralPartialEq for SizeClass