pub struct Table { /* private fields */ }
Expand description

A column-oriented structure-of-arrays based storage for Components of entities in a World.

Conceptually, a Table can be thought of as an HashMap<ComponentId, Column>, where each Column is a type-erased Vec<T: Component>. Each row corresponds to a single entity (i.e. index 3 in Column A and index 3 in Column B point to different components on the same entity). Fetching components from a table involves fetching the associated column for a component type (via its ComponentId), then fetching the entity’s row within that column.

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impl Table

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pub fn entities(&self) -> &[Entity]

Fetches a read-only slice of the entities stored within the Table.

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pub fn get_column(&self, component_id: ComponentId) -> Option<&Column>

Fetches a read-only reference to the Column for a given Component within the table.

Returns None if the corresponding component does not belong to the table.

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pub fn has_column(&self, component_id: ComponentId) -> bool

Checks if the table contains a Column for a given Component.

Returns true if the column is present, false otherwise.

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pub fn entity_count(&self) -> usize

Gets the number of entities currently being stored in the table.

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pub fn component_count(&self) -> usize

Gets the number of components being stored in the table.

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pub fn entity_capacity(&self) -> usize

Gets the maximum number of entities the table can currently store without reallocating the underlying memory.

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pub fn is_empty(&self) -> bool

Checks if the Table is empty or not.

Returns true if the table contains no entities, false otherwise.

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

Iterates over the Columns of the Table.

Auto Trait Implementations§

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impl !RefUnwindSafe for Table

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impl !Send for Table

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impl !Sync for Table

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impl Unpin for Table

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impl UnwindSafe for Table

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, U> AsBindGroupShaderType<U> for T
where U: ShaderType, &'a T: for<'a> Into<U>,

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fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U

Return the T ShaderType for self. When used in AsBindGroup derives, it is safe to assume that all images in self exist.
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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
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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> Downcast<T> for T

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fn downcast(&self) -> &T

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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait.
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Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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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<S> FromSample<S> for S

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fn from_sample_(s: S) -> S

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
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Calls U::from(self).

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fn to_sample_(self) -> U

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