Struct Slab 

pub struct Slab<T> { /* private fields */ }

Reusable pool of Arc<T> slabs.

T must be Default so the pool can mint fresh empty slabs when its reserve is exhausted.

Implementations

impl<T: Default> Slab<T>

pub fn new(cap: usize) -> Self

Create a new Slab that retains at most cap reusable slabs.

pub fn acquire(&self) -> Arc<T>

Pull a slab from the pool, or allocate a fresh one if the pool is empty (or every retained slab is still referenced elsewhere).

Returned slabs always have strong_count == 1, so the caller can mutate them in place via Arc::make_mut without the COW fork penalty.

pub fn release(&self, slab: Arc<T>)

Return a slab to the pool. If the pool is at its cap the slab is dropped instead so memory pressure does not grow without bound.

impl<T> Slab<T>

pub fn len(&self) -> usize

Number of slabs currently held in the pool. Primarily for tests.

pub fn is_empty(&self) -> bool

true if the pool is empty. Primarily for tests.