Struct Arena 

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

A minimal generational arena (house rule: 40 boring lines beat a dependency). Slots are reused; each reuse bumps the generation.

Implementations

impl<K, T> Arena<K, T>

pub fn insert(&mut self, value: T) -> Id<K>

pub fn get(&self, id: Id<K>) -> Option<&T>

None for a stale id — never the wrong document.

pub fn get_mut(&mut self, id: Id<K>) -> Option<&mut T>

pub fn remove(&mut self, id: Id<K>) -> Option<T>

Remove and return the value; stale ids get None.

pub fn iter(&self) -> impl Iterator<Item = (Id<K>, &T)>

pub fn len(&self) -> usize

pub fn clear(&mut self)

Drop every live value (slot reuse still bumps generations).

pub fn is_empty(&self) -> bool

Trait Implementations

impl<K, T> Default for Arena<K, T>

fn default() -> Self

Returns the “default value” for a type.