Struct Arena 

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

An append-only arena with typed Handle-based access.

Implementations

impl<T> Arena<T>

pub fn new() -> Self

Creates an empty arena.

pub fn len(&self) -> usize

Returns the number of elements in the arena.

pub fn is_empty(&self) -> bool

Returns true if the arena contains no elements.

pub fn next_handle(&self) -> Handle<T>

Returns the handle that will be assigned to the next appended value.

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

Appends a value and returns its handle.

pub fn try_get(&self, handle: Handle<T>) -> Option<&T>

Returns a reference to the value if the handle is valid.

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

Iterates over (handle, &value) pairs.

pub fn iter_mut(&mut self) -> impl Iterator<Item = (Handle<T>, &mut T)>

Iterates over (handle, &mut value) pairs.

Trait Implementations

impl<T: Clone> Clone for Arena<T>

fn clone(&self) -> Arena<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Arena<T>

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

Formats the value using the given formatter.

impl<T> Default for Arena<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T> Index<Handle<T>> for Arena<T>

type Output = T

The returned type after indexing.

fn index(&self, handle: Handle<T>) -> &T

Performs the indexing (container[index]) operation.

impl<T> IndexMut<Handle<T>> for Arena<T>

fn index_mut(&mut self, handle: Handle<T>) -> &mut T

Performs the mutable indexing (container[index]) operation.