Struct naga::Arena

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

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.

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impl<T> Arena<T>

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pub const fn new() -> Self

Create a new arena with no initial capacity allocated.

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pub fn into_inner(self) -> Vec<T>

Extracts the inner vector.

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pub fn len(&self) -> usize

Returns the current number of items stored in this arena.

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pub fn is_empty(&self) -> bool

Returns true if the arena contains no elements.

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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.

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

Drains the arena, returning an iterator over the items stored.

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

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

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

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

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

Fetch a handle to an existing type.

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pub fn fetch_if_or_append<F: Fn(&T, &T) -> bool>( &mut self, value: T, span: Span, 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.

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

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

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

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

Get a mutable reference to an element in the arena.

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pub fn range_from(&self, old_length: usize) -> Range<T>

Get the range of handles from a particular number of elements to the end.

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pub fn clear(&mut self)

Clears the arena keeping all allocations

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pub fn get_span(&self, handle: Handle<T>) -> Span

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pub fn check_contains_handle(&self, handle: Handle<T>) -> Result<(), BadHandle>

Assert that handle is valid for this arena.

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pub fn check_contains_range( &self, range: &Range<T> ) -> Result<(), BadRangeError>

Assert that range is valid for this arena.

Trait Implementations§

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

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for Arena<T>

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

Formats the value using the given formatter. Read more
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impl<T> Default for Arena<T>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T> Index<Handle<T>> for Arena<T>

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type Output = T

The returned type after indexing.
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fn index(&self, handle: Handle<T>) -> &T

Performs the indexing (container[index]) operation. Read more
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impl<T> Index<Range<T>> for Arena<T>

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type Output = [T]

The returned type after indexing.
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fn index(&self, range: Range<T>) -> &[T]

Performs the indexing (container[index]) operation. Read more
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impl<T> IndexMut<Handle<T>> for Arena<T>

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

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

Auto Trait Implementations§

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impl<T> Freeze for Arena<T>

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impl<T> RefUnwindSafe for Arena<T>
where T: RefUnwindSafe,

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impl<T> Send for Arena<T>
where T: Send,

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impl<T> Sync for Arena<T>
where T: Sync,

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impl<T> Unpin for Arena<T>
where T: Unpin,

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impl<T> UnwindSafe for Arena<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.