Struct Arena 

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

Typed append-only arena indexed by a strongly-typed ID.

The ID type must implement a constructor from u32; see the impl blocks below for each concrete instantiation.

Implementations

impl<T> Arena<T>

pub fn alloc(&mut self, value: T) -> u32

Push a value and return its index.

pub fn get(&self, index: u32) -> Option<&T>

Return a reference to the value at index.

Returns None if the index is out of bounds.

pub fn len(&self) -> usize

Return the number of allocated items.

pub fn is_empty(&self) -> bool

Return true when no items have been allocated.

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

Iterate over all allocated items in allocation order.

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: Eq> Eq for Arena<T>

impl<T: PartialEq> PartialEq for Arena<T>

fn eq(&self, other: &Arena<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: PartialEq> StructuralPartialEq for Arena<T>