Struct Arena 

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

A bump allocator for stable, arena-allocated references.

Values allocated in an arena live until the arena is dropped or reset. References remain valid across subsequent allocations, making this ideal for AST nodes that reference each other.

Implementations

impl<T> Arena<T>

pub fn new() -> Arena<T>

Creates an empty arena.

pub fn alloc(&self, value: T) -> &T

Allocates a value and returns a reference valid for the arena’s lifetime.

pub fn alloc_slice<I>(&self, items: I) -> &[T]

where I: IntoIterator<Item = T>, <I as IntoIterator>::IntoIter: ExactSizeIterator,

Allocates a slice from an iterator.

The iterator must implement ExactSizeIterator so the arena can pre-allocate the correct amount of space.

pub fn reset(&mut self)

Resets the arena, invalidating all references but keeping allocated capacity.

This enables zero-allocation REPL loops by reusing memory.

Trait Implementations

impl<T> Default for Arena<T>

fn default() -> Arena<T>

Returns the “default value” for a type.