Struct FilteredEntityMut

pub struct FilteredEntityMut<'w> { /* private fields */ }

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

To define the access when used as a QueryData, use a QueryBuilder or QueryParamBuilder. The FilteredEntityMut must be the entire QueryData, and not nested inside a tuple with other data.

// This gives the `FilteredEntityMut` access to `&mut A`.
let mut query = QueryBuilder::<FilteredEntityMut>::new(&mut world)
    .data::<&mut A>()
    .build();

let mut filtered_entity: FilteredEntityMut = query.single_mut(&mut world);
let component: Mut<A> = filtered_entity.get_mut().unwrap();

// Here `FilteredEntityMut` is nested in a tuple, so it does not have access to `&mut A`.
let mut query = QueryBuilder::<(Entity, FilteredEntityMut)>::new(&mut world)
    .data::<&mut A>()
    .build();

let (_, mut filtered_entity) = query.single_mut(&mut world);
assert!(filtered_entity.get_mut::<A>().is_none());

Implementations

impl<'w> FilteredEntityMut<'w>

pub fn reborrow(&mut self) -> FilteredEntityMut<'_>

Returns a new instance with a shorter lifetime. This is useful if you have &mut FilteredEntityMut, but you need FilteredEntityMut.

pub fn as_readonly(&self) -> FilteredEntityRef<'_>

Gets read-only access to all of the entity’s components.

pub fn id(&self) -> Entity

Returns the ID of the current entity.

pub fn location(&self) -> EntityLocation

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

pub fn archetype(&self) -> &Archetype

Returns the archetype that the current entity belongs to.

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

Returns a reference to the underlying Access.

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

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.

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

• If you know the concrete type of the component, you should prefer Self::contains.
• If you know the component’s TypeId but not its ComponentId, consider using Self::contains_type_id.

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.

Notes

• If you know the concrete type of the component, you should prefer Self::contains.
• If you have a ComponentId instead of a TypeId, consider using Self::contains_id.

pub fn get<T: Component>(&self) -> Option<&T>

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.

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

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.

pub fn get_mut<T: Component>(&mut self) -> Option<Mut<'_, T>>

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

pub fn into_mut<T: Component>(self) -> Option<Mut<'w, T>>

Consumes self and gets mutable access to the component of type T with the world 'w lifetime for the current entity. Returns None if the entity does not have a component of type T.

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

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

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.

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

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

pub fn get_mut_by_id( &mut self, component_id: ComponentId, ) -> Option<MutUntyped<'_>>

Gets a MutUntyped of the component of the given ComponentId from the entity.

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

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

Trait Implementations

impl<'a> From<&'a FilteredEntityMut<'_>> for FilteredEntityRef<'a>

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

Converts to this type from the input type.

impl<'a> From<&'a mut EntityMut<'_>> for FilteredEntityMut<'a>

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

Converts to this type from the input type.

impl<'a> From<&'a mut EntityWorldMut<'_>> for FilteredEntityMut<'a>

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

Converts to this type from the input type.

impl<'a> From<EntityMut<'a>> for FilteredEntityMut<'a>

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

Converts to this type from the input type.

impl<'a> From<EntityWorldMut<'a>> for FilteredEntityMut<'a>

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

Converts to this type from the input type.

impl<'w> From<FilteredEntityMut<'w>> for FilteredEntityRef<'w>

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

Converts to this type from the input type.

impl<'a> QueryData for FilteredEntityMut<'a>

SAFETY: access of FilteredEntityRef is a subset of FilteredEntityMut

type ReadOnly = FilteredEntityRef<'a>

The read-only variant of this QueryData, which satisfies the ReadOnlyQueryData trait.

impl<'a> TryFrom<&'a FilteredEntityMut<'_>> for EntityRef<'a>

type Error = TryFromFilteredError

The type returned in the event of a conversion error.

fn try_from(value: &'a FilteredEntityMut<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryFrom<&'a mut FilteredEntityMut<'_>> for EntityMut<'a>

type Error = TryFromFilteredError

The type returned in the event of a conversion error.

fn try_from(value: &'a mut FilteredEntityMut<'_>) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryFrom<FilteredEntityMut<'a>> for EntityMut<'a>

type Error = TryFromFilteredError

The type returned in the event of a conversion error.

fn try_from(value: FilteredEntityMut<'a>) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> TryFrom<FilteredEntityMut<'a>> for EntityRef<'a>

type Error = TryFromFilteredError

The type returned in the event of a conversion error.

fn try_from(value: FilteredEntityMut<'a>) -> Result<Self, Self::Error>

Performs the conversion.

impl<'a> WorldQuery for FilteredEntityMut<'a>

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

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.

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

Per archetype/table state used by this WorldQuery to fetch Self::Item

type Item<'w> = FilteredEntityMut<'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.

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.

fn shrink<'wlong: 'wshort, 'wshort>( item: Self::Item<'wlong>, ) -> Self::Item<'wshort>

This function manually implements subtyping for the query items.

fn shrink_fetch<'wlong: 'wshort, 'wshort>( fetch: Self::Fetch<'wlong>, ) -> Self::Fetch<'wshort>

This function manually implements subtyping for the query fetches.

unsafe fn init_fetch<'w>( world: UnsafeWorldCell<'w>, _state: &Self::State, _last_run: Tick, _this_run: Tick, ) -> Self::Fetch<'w>

Creates a new instance of this fetch.

unsafe fn set_archetype<'w>( fetch: &mut Self::Fetch<'w>, state: &Self::State, _: &'w Archetype, _table: &Table, )

Adjusts internal state to account for the next Archetype. This will always be called on archetypes that match this WorldQuery.

unsafe fn set_table<'w>( fetch: &mut Self::Fetch<'w>, state: &Self::State, _: &'w Table, )

Adjusts internal state to account for the next Table. This will always be called on tables that match this WorldQuery.

fn set_access<'w>(state: &mut Self::State, access: &FilteredAccess<ComponentId>)

Sets available accesses for implementors with dynamic access such as FilteredEntityRef or FilteredEntityMut.

unsafe fn fetch<'w>( (world, access): &mut Self::Fetch<'w>, entity: Entity, _table_row: TableRow, ) -> Self::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.

fn update_component_access( state: &Self::State, filtered_access: &mut FilteredAccess<ComponentId>, )

Adds any component accesses used by this WorldQuery to access.

fn init_state(_world: &mut World) -> Self::State

Creates and initializes a State for this WorldQuery type.

fn get_state(_components: &Components) -> Option<Self::State>

Attempts to initialize a State for this WorldQuery type using read-only access to Components.

fn matches_component_set( _state: &Self::State, _set_contains_id: &impl Fn(ComponentId) -> bool, ) -> bool

Returns true if this query matches a set of components. Otherwise, returns false.