Struct Components

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

Stores metadata associated with each kind of Component in a given World.

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impl Components

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pub fn len(&self) -> usize

Returns the number of components registered or queued with this instance.

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pub fn is_empty(&self) -> bool

Returns true if there are no components registered or queued with this instance. Otherwise, this returns false.

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pub fn num_queued(&self) -> usize

Returns the number of components registered with this instance.

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pub fn any_queued(&self) -> bool

Returns true if there are any components registered with this instance. Otherwise, this returns false.

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pub fn num_queued_mut(&mut self) -> usize

A faster version of Self::num_queued.

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pub fn any_queued_mut(&mut self) -> bool

A faster version of Self::any_queued.

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pub fn num_registered(&self) -> usize

Returns the number of components registered with this instance.

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pub fn any_registered(&self) -> bool

Returns true if there are any components registered with this instance. Otherwise, this returns false.

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pub fn get_info(&self, id: ComponentId) -> Option<&ComponentInfo>

Gets the metadata associated with the given component, if it is registered. This will return None if the id is not regiserted or is queued.

This will return an incorrect result if id did not come from the same world as self. It may return None or a garbage value.

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pub fn get_descriptor<'a>( &'a self, id: ComponentId, ) -> Option<Cow<'a, ComponentDescriptor>>

Gets the ComponentDescriptor of the component with this ComponentId if it is present. This will return None only if the id is neither regisered nor queued to be registered.

Currently, the Cow will be Cow::Owned if and only if the component is queued. It will be Cow::Borrowed otherwise.

This will return an incorrect result if id did not come from the same world as self. It may return None or a garbage value.

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pub fn get_name<'a>(&'a self, id: ComponentId) -> Option<Cow<'a, str>>

Gets the name of the component with this ComponentId if it is present. This will return None only if the id is neither regisered nor queued to be registered.

This will return an incorrect result if id did not come from the same world as self. It may return None or a garbage value.

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pub unsafe fn get_info_unchecked(&self, id: ComponentId) -> &ComponentInfo

Gets the metadata associated with the given component.

§Safety

id must be a valid and fully registered ComponentId.

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pub fn is_id_valid(&self, id: ComponentId) -> bool

Returns true if the ComponentId is fully registered and valid. Ids may be invalid if they are still queued to be registered. Those ids are still correct, but they are not usable in every context yet.

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pub fn get_valid_id(&self, type_id: TypeId) -> Option<ComponentId>

Type-erased equivalent of Components::valid_component_id().

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

Returns the ComponentId of the given Component type T if it is fully registered. If you want to include queued registration, see Components::component_id().

use bevy_ecs::prelude::*;

let mut world = World::new();

#[derive(Component)]
struct ComponentA;

let component_a_id = world.register_component::<ComponentA>();

assert_eq!(component_a_id, world.components().valid_component_id::<ComponentA>().unwrap())
§See also
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pub fn get_valid_resource_id(&self, type_id: TypeId) -> Option<ComponentId>

Type-erased equivalent of Components::valid_resource_id().

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pub fn valid_resource_id<T: Resource>(&self) -> Option<ComponentId>

Returns the ComponentId of the given Resource type T if it is fully registered. If you want to include queued registration, see Components::resource_id().

use bevy_ecs::prelude::*;

let mut world = World::new();

#[derive(Resource, Default)]
struct ResourceA;

let resource_a_id = world.init_resource::<ResourceA>();

assert_eq!(resource_a_id, world.components().valid_resource_id::<ResourceA>().unwrap())
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pub fn get_id(&self, type_id: TypeId) -> Option<ComponentId>

Type-erased equivalent of Components::component_id().

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

Returns the ComponentId of the given Component type T.

The returned ComponentId is specific to the Components instance it was retrieved from and should not be used with another Components instance.

Returns None if the Component type has not yet been initialized using ComponentsRegistrator::register_component() or ComponentsQueuedRegistrator::queue_register_component().

use bevy_ecs::prelude::*;

let mut world = World::new();

#[derive(Component)]
struct ComponentA;

let component_a_id = world.register_component::<ComponentA>();

assert_eq!(component_a_id, world.components().component_id::<ComponentA>().unwrap())
§See also
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pub fn get_resource_id(&self, type_id: TypeId) -> Option<ComponentId>

Type-erased equivalent of Components::resource_id().

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pub fn resource_id<T: Resource>(&self) -> Option<ComponentId>

Returns the ComponentId of the given Resource type T.

The returned ComponentId is specific to the Components instance it was retrieved from and should not be used with another Components instance.

Returns None if the Resource type has not yet been initialized using ComponentsRegistrator::register_resource() or ComponentsQueuedRegistrator::queue_register_resource().

use bevy_ecs::prelude::*;

let mut world = World::new();

#[derive(Resource, Default)]
struct ResourceA;

let resource_a_id = world.init_resource::<ResourceA>();

assert_eq!(resource_a_id, world.components().resource_id::<ResourceA>().unwrap())
§See also
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pub fn iter_registered(&self) -> impl Iterator<Item = &ComponentInfo> + '_

Gets an iterator over all components fully registered with this instance.

Trait Implementations§

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impl Debug for Components

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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 Default for Components

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fn default() -> Components

Returns the “default value” for a type. Read more
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impl<'a> SystemParam for &'a Components

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type State = ()

Used to store data which persists across invocations of a system.
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type Item<'w, 's> = &'w Components

The item type returned when constructing this system param. The value of this associated type should be Self, instantiated with new lifetimes. Read more
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fn init_state(_world: &mut World, _system_meta: &mut SystemMeta) -> Self::State

Registers any World access used by this SystemParam and creates a new instance of this param’s State.
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unsafe fn get_param<'w, 's>( _state: &'s mut Self::State, _system_meta: &SystemMeta, world: UnsafeWorldCell<'w>, _change_tick: Tick, ) -> Self::Item<'w, 's>

Creates a parameter to be passed into a SystemParamFunction. Read more
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unsafe fn new_archetype( state: &mut Self::State, archetype: &Archetype, system_meta: &mut SystemMeta, )

For the specified Archetype, registers the components accessed by this SystemParam (if applicable).a Read more
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fn apply(state: &mut Self::State, system_meta: &SystemMeta, world: &mut World)

Applies any deferred mutations stored in this SystemParam’s state. This is used to apply Commands during ApplyDeferred.
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fn queue( state: &mut Self::State, system_meta: &SystemMeta, world: DeferredWorld<'_>, )

Queues any deferred mutations to be applied at the next ApplyDeferred.
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unsafe fn validate_param( state: &Self::State, system_meta: &SystemMeta, world: UnsafeWorldCell<'_>, ) -> Result<(), SystemParamValidationError>

Validates that the param can be acquired by the get_param. Read more
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impl<'a> ReadOnlySystemParam for &'a Components

Auto Trait 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> Downcast for T
where T: Any,

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

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

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

Converts &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)

Converts &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<T> FromWorld for T
where T: Default,

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fn from_world(_world: &mut World) -> T

Creates Self using default().

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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, 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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