pub struct FilteredEntityRef<'w> { /* private fields */ }
Expand description

Provides read-only access to a single entity and some of its components defined by the contained Access.

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impl<'w> FilteredEntityRef<'w>

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pub fn id(&self) -> Entity

Returns the ID of the current entity.

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pub fn location(&self) -> EntityLocation

Gets metadata indicating the location where the current entity is stored.

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pub fn archetype(&self) -> &Archetype

Returns the archetype that the current entity belongs to.

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pub fn components(&self) -> impl Iterator<Item = ComponentId>

Returns an iterator over the component ids that are accessed by self.

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pub fn access(&self) -> &Access<ComponentId>

Returns a reference to the underlying Access.

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pub fn contains<T>(&self) -> bool
where T: Component,

Returns true if the current entity has a component of type T. Otherwise, this returns false.

Notes

If you do not know the concrete type of a component, consider using Self::contains_id or Self::contains_type_id.

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

Returns true if the current entity has a component identified by component_id. Otherwise, this returns false.

Notes
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pub fn contains_type_id(&self, type_id: TypeId) -> bool

Returns true if the current entity has a component with the type identified by type_id. Otherwise, this returns false.

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pub fn get<T>(&self) -> Option<&'w T>
where T: Component,

Gets access to the component of type T for the current entity. Returns None if the entity does not have a component of type T.

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pub fn get_ref<T>(&self) -> Option<Ref<'w, T>>
where T: Component,

Gets access to the component of type T for the current entity, including change detection information as a Ref.

Returns None if the entity does not have a component of type T.

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pub fn get_change_ticks<T>(&self) -> Option<ComponentTicks>
where T: Component,

Retrieves the change ticks for the given component. This can be useful for implementing change detection in custom runtimes.

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pub fn get_change_ticks_by_id( &self, component_id: ComponentId ) -> Option<ComponentTicks>

Retrieves the change ticks for the given ComponentId. This can be useful for implementing change detection in custom runtimes.

You should prefer to use the typed API Self::get_change_ticks where possible and only use this in cases where the actual component types are not known at compile time.

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pub fn get_by_id(&self, component_id: ComponentId) -> Option<Ptr<'w>>

Gets the component of the given ComponentId from the entity.

You should prefer to use the typed API Self::get where possible and only use this in cases where the actual component types are not known at compile time.

Unlike FilteredEntityRef::get, this returns a raw pointer to the component, which is only valid while the FilteredEntityRef is alive.

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impl<'w> Clone for FilteredEntityRef<'w>

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fn clone(&self) -> FilteredEntityRef<'w>

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<'a> From<&'a EntityMut<'_>> for FilteredEntityRef<'a>

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fn from(entity: &'a EntityMut<'_>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<&'a EntityRef<'_>> for FilteredEntityRef<'a>

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fn from(entity: &'a EntityRef<'_>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<&'a EntityWorldMut<'_>> for FilteredEntityRef<'a>

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fn from(entity: &'a EntityWorldMut<'_>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<&'a FilteredEntityMut<'_>> for FilteredEntityRef<'a>

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fn from(entity_mut: &'a FilteredEntityMut<'_>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<EntityMut<'a>> for FilteredEntityRef<'a>

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fn from(entity: EntityMut<'a>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<EntityRef<'a>> for FilteredEntityRef<'a>

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fn from(entity: EntityRef<'a>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'a> From<EntityWorldMut<'a>> for FilteredEntityRef<'a>

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fn from(entity: EntityWorldMut<'a>) -> FilteredEntityRef<'a>

Converts to this type from the input type.
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impl<'w> From<FilteredEntityMut<'w>> for FilteredEntityRef<'w>

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fn from(entity_mut: FilteredEntityMut<'w>) -> FilteredEntityRef<'w>

Converts to this type from the input type.
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impl<'a> QueryData for FilteredEntityRef<'a>

SAFETY: Self is the same as Self::ReadOnly

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type ReadOnly = FilteredEntityRef<'a>

The read-only variant of this QueryData, which satisfies the ReadOnlyQueryData trait.
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impl<'a> TryFrom<&'a FilteredEntityRef<'_>> for EntityRef<'a>

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type Error = TryFromFilteredError

The type returned in the event of a conversion error.
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fn try_from( value: &'a FilteredEntityRef<'_> ) -> Result<EntityRef<'a>, <EntityRef<'a> as TryFrom<&'a FilteredEntityRef<'_>>>::Error>

Performs the conversion.
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impl<'a> TryFrom<FilteredEntityRef<'a>> for EntityRef<'a>

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type Error = TryFromFilteredError

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

Performs the conversion.
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impl<'a> WorldQuery for FilteredEntityRef<'a>

SAFETY: The accesses of Self::ReadOnly are a subset of the accesses of Self

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type Fetch<'w> = (UnsafeWorldCell<'w>, Access<ComponentId>)

Per archetype/table state used by this WorldQuery to fetch Self::Item
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type Item<'w> = FilteredEntityRef<'w>

The item returned by this WorldQuery For QueryData this will be the item returned by the query. For QueryFilter this will be either (), or a bool indicating whether the entity should be included or a tuple of such things.
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type State = FilteredAccess<ComponentId>

State used to construct a Self::Fetch. This will be cached inside QueryState, so it is best to move as much data / computation here as possible to reduce the cost of constructing Self::Fetch.
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fn shrink<'wlong, 'wshort>( item: <FilteredEntityRef<'a> as WorldQuery>::Item<'wlong> ) -> <FilteredEntityRef<'a> as WorldQuery>::Item<'wshort>
where 'wlong: 'wshort,

This function manually implements subtyping for the query items.
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const IS_DENSE: bool = false

Returns true if (and only if) every table of every archetype matched by this fetch contains all of the matched components. This is used to select a more efficient “table iterator” for “dense” queries. If this returns true, WorldQuery::set_table must be used before WorldQuery::fetch can be called for iterators. If this returns false, WorldQuery::set_archetype must be used before WorldQuery::fetch can be called for iterators.
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unsafe fn init_fetch<'w>( world: UnsafeWorldCell<'w>, _state: &<FilteredEntityRef<'a> as WorldQuery>::State, _last_run: Tick, _this_run: Tick ) -> <FilteredEntityRef<'a> as WorldQuery>::Fetch<'w>

Creates a new instance of this fetch. Read more
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unsafe fn set_archetype<'w>( fetch: &mut <FilteredEntityRef<'a> as WorldQuery>::Fetch<'w>, state: &<FilteredEntityRef<'a> as WorldQuery>::State, archetype: &'w Archetype, _table: &Table )

Adjusts internal state to account for the next Archetype. This will always be called on archetypes that match this WorldQuery. Read more
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unsafe fn set_table<'w>( fetch: &mut <FilteredEntityRef<'a> as WorldQuery>::Fetch<'w>, state: &<FilteredEntityRef<'a> as WorldQuery>::State, table: &'w Table )

Adjusts internal state to account for the next Table. This will always be called on tables that match this WorldQuery. Read more
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fn set_access<'w>( state: &mut <FilteredEntityRef<'a> as WorldQuery>::State, access: &FilteredAccess<ComponentId> )

Sets available accesses for implementors with dynamic access such as FilteredEntityRef or FilteredEntityMut. Read more
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unsafe fn fetch<'w>( _: &mut <FilteredEntityRef<'a> as WorldQuery>::Fetch<'w>, entity: Entity, _table_row: TableRow ) -> <FilteredEntityRef<'a> as WorldQuery>::Item<'w>

Fetch Self::Item for either the given entity in the current Table, or for the given entity in the current Archetype. This must always be called after WorldQuery::set_table with a table_row in the range of the current Table or after WorldQuery::set_archetype with a entity in the current archetype. Read more
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fn update_component_access( state: &<FilteredEntityRef<'a> as WorldQuery>::State, filtered_access: &mut FilteredAccess<ComponentId> )

Adds any component accesses used by this WorldQuery to access.
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fn init_state( _world: &mut World ) -> <FilteredEntityRef<'a> as WorldQuery>::State

Creates and initializes a State for this WorldQuery type.
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fn get_state( _world: &World ) -> Option<<FilteredEntityRef<'a> as WorldQuery>::State>

Attempts to initializes a State for this WorldQuery type.
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fn matches_component_set( _state: &<FilteredEntityRef<'a> as WorldQuery>::State, _set_contains_id: &impl Fn(ComponentId) -> bool ) -> bool

Returns true if this query matches a set of components. Otherwise, returns false.
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impl ReadOnlyQueryData for FilteredEntityRef<'_>

SAFETY: Access is read-only.

Auto Trait Implementations§

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impl<'w> !RefUnwindSafe for FilteredEntityRef<'w>

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impl<'w> Send for FilteredEntityRef<'w>

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impl<'w> Sync for FilteredEntityRef<'w>

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impl<'w> Unpin for FilteredEntityRef<'w>

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impl<'w> !UnwindSafe for FilteredEntityRef<'w>

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
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> 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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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

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> DowncastSync for T
where T: Any + Send + Sync,

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fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait.
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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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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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> ToSample<U> for T
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fn to_sample_(self) -> U

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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.
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impl<T> TypeData for T
where T: 'static + Send + Sync + Clone,

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impl<T> Upcast<T> for T

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fn upcast(&self) -> Option<&T>

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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