bevy_ecs::component

Struct ComponentId

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pub struct ComponentId(/* private fields */);
Expand description

A value which uniquely identifies the type of a Component of Resource within a World.

Each time a new Component type is registered within a World using e.g. World::init_component or World::init_component_with_descriptor or a Resource with e.g. World::init_resource, a corresponding ComponentId is created to track it.

While the distinction between ComponentId and TypeId may seem superficial, breaking them into two separate but related concepts allows components to exist outside of Rust’s type system. Each Rust type registered as a Component will have a corresponding ComponentId, but additional ComponentIds may exist in a World to track components which cannot be represented as Rust types for scripting or other advanced use-cases.

A ComponentId is tightly coupled to its parent World. Attempting to use a ComponentId from one World to access the metadata of a Component in a different World is undefined behavior and must not be attempted.

Given a type T which implements Component, the ComponentId for T can be retrieved from a World using World::component_id() or via Components::component_id(). Access to the ComponentId for a Resource is available via Components::resource_id().

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impl ComponentId

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pub const fn new(index: usize) -> ComponentId

Creates a new ComponentId.

The index is a unique value associated with each type of component in a given world. Usually, this value is taken from a counter incremented for each type of component registered with the world.

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pub fn index(self) -> usize

Returns the index of the current component.

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impl Clone for ComponentId

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fn clone(&self) -> ComponentId

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 Debug for ComponentId

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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: Component> From<ComponentIdFor<'_, T>> for ComponentId

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fn from(to_component_id: ComponentIdFor<'_, T>) -> ComponentId

Converts to this type from the input type.
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impl Hash for ComponentId

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for ComponentId

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fn cmp(&self, other: &ComponentId) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl PartialEq for ComponentId

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fn eq(&self, other: &ComponentId) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for ComponentId

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fn partial_cmp(&self, other: &ComponentId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl SparseSetIndex for ComponentId

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fn sparse_set_index(&self) -> usize

Gets the sparse set index corresponding to this instance.
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fn get_sparse_set_index(value: usize) -> Self

Creates a new instance of this type with the specified index.
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impl TriggerTargets for ComponentId

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

The components the trigger should target.
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fn entities(&self) -> impl ExactSizeIterator<Item = Entity>

The entities the trigger should target.
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impl Copy for ComponentId

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impl Eq for ComponentId

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impl StructuralPartialEq for ComponentId

Auto Trait Implementations§

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<T> DynEq for T
where T: Any + Eq,

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fn as_any(&self) -> &(dyn Any + 'static)

Casts the type to dyn Any.
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fn dyn_eq(&self, other: &(dyn DynEq + 'static)) -> bool

This method tests for self and other values to be equal. Read more
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impl<T> DynHash for T
where T: DynEq + Hash,

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fn as_dyn_eq(&self) -> &(dyn DynEq + 'static)

Casts the type to dyn Any.
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fn dyn_hash(&self, state: &mut dyn Hasher)

Feeds this value into the given Hasher.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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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> 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> 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> 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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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ConditionalSend for T
where T: Send,

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impl<N> NodeTrait for N
where N: Copy + Ord + Hash,