Struct naga::Arena

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

An arena holding some kind of component (e.g., type, constant, instruction, etc.) that can be referenced.

Adding new items to the arena produces a strongly-typed Handle. The arena can be indexed using the given handle to obtain a reference to the stored item.

Implementations

impl<T> Arena<T>

pub fn new() -> Self

Create a new arena with no initial capacity allocated.

pub fn len(&self) -> usize

Returns the current number of items stored in this arena.

pub fn is_empty(&self) -> bool

Returns true if the arena contains no elements.

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

Returns an iterator over the items stored in this arena, returning both the item's handle and a reference to it.

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

Adds a new value to the arena, returning a typed handle.

The value is not linked to any SPIR-V module.

pub fn fetch_if<F: Fn(&T) -> bool>(&self, fun: F) -> Option<Handle<T>>

Fetch a handle to an existing type.

pub fn fetch_if_or_append<F: Fn(&T, &T) -> bool>(
    &mut self,
    value: T,
    fun: F
) -> Handle<T>

Adds a value with a custom check for uniqueness: returns a handle pointing to an existing element if the check succeeds, or adds a new element otherwise.

pub fn fetch_or_append(&mut self, value: T) -> Handle<T> where
    T: PartialEq, 

Adds a value with a check for uniqueness, where the check is plain comparison.

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

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

Get a mutable reference to an element in the arena.

Trait Implementations

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.