Struct Arena 

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

An append-only arena of T, addressed by Idx<T>.

Implementations

impl<T> Arena<T>

pub fn new() -> Self

An empty arena.

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

Appends a value, returning a stable handle to it.

pub fn len(&self) -> usize

The number of allocated elements.

pub fn is_empty(&self) -> bool

Whether nothing has been allocated yet.

pub fn iter(&self) -> impl ExactSizeIterator<Item = (Idx<T>, &T)>

Iterates every (handle, value) pair 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<'de, T> Deserialize<'de> for Arena<T>

where T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T: Eq> Eq for Arena<T>

impl<T> Index<Idx<T>> for Arena<T>

type Output = T

The returned type after indexing.

fn index(&self, idx: Idx<T>) -> &T

Performs the indexing (container[index]) operation.

impl<T> IndexMut<Idx<T>> for Arena<T>

fn index_mut(&mut self, idx: Idx<T>) -> &mut T

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

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

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

Equality operator ==.

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

Inequality operator !=.

impl<T> Serialize for Arena<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

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