Struct Arena 

pub struct Arena { /* private fields */ }

A single epoch’s memory arena.

Allocates by bumping a pointer forward - extremely fast. You can’t free individual allocations; instead, drop the whole arena when the epoch is no longer needed.

Thread-safe: multiple threads can allocate concurrently using atomics.

Implementations

impl Arena

pub fn new(epoch: EpochId) -> Self

Creates a new arena for the given epoch.

pub fn with_chunk_size(epoch: EpochId, chunk_size: usize) -> Self

Creates a new arena with a custom chunk size.

pub fn epoch(&self) -> EpochId

Returns the epoch this arena belongs to.

pub fn alloc(&self, size: usize, align: usize) -> NonNull<u8>

Allocates size bytes with the given alignment.

Panics

Panics if allocation fails (out of memory).

pub fn alloc_value<T>(&self, value: T) -> &mut T

Allocates a value of type T.

pub fn alloc_slice<T: Copy>(&self, values: &[T]) -> &mut [T]

Allocates a slice of values.

pub fn total_allocated(&self) -> usize

Returns the total memory allocated by this arena.

pub fn total_used(&self) -> usize

Returns the total memory used (not just allocated capacity).

pub fn stats(&self) -> ArenaStats

Returns statistics about this arena.