ComponentEntry

Enum ComponentEntry 

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pub enum ComponentEntry<'w, 'a, T>
where T: Component,
{ Occupied(OccupiedComponentEntry<'w, 'a, T>), Vacant(VacantComponentEntry<'w, 'a, T>), }
Expand description

A view into a single entity and component in a world, which may either be vacant or occupied.

This enum can only be constructed from the entry method on EntityWorldMut.

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Occupied(OccupiedComponentEntry<'w, 'a, T>)

An occupied entry.

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Vacant(VacantComponentEntry<'w, 'a, T>)

A vacant entry.

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impl<'w, 'a, T> ComponentEntry<'w, 'a, T>
where T: Component<Mutability = Mutable>,

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pub fn and_modify<F>(self, f: F) -> ComponentEntry<'w, 'a, T>
where F: FnOnce(Mut<'_, T>),

Provides in-place mutable access to an occupied entry.

§Examples
#[derive(Component, Default, Clone, Copy, Debug, PartialEq)]
struct Comp(u32);

let mut entity = world.spawn(Comp(0));

entity.entry::<Comp>().and_modify(|mut c| c.0 += 1);
assert_eq!(world.query::<&Comp>().single(&world).unwrap().0, 1);
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impl<'w, 'a, T> ComponentEntry<'w, 'a, T>
where T: Component,

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pub fn insert_entry(self, component: T) -> OccupiedComponentEntry<'w, 'a, T>

Replaces the component of the entry, and returns an OccupiedComponentEntry.

§Examples
#[derive(Component, Default, Clone, Copy, Debug, PartialEq)]
struct Comp(u32);

let mut entity = world.spawn_empty();

let entry = entity.entry().insert_entry(Comp(4));
assert_eq!(entry.get(), &Comp(4));

let entry = entity.entry().insert_entry(Comp(2));
assert_eq!(entry.get(), &Comp(2));
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pub fn or_insert(self, default: T) -> OccupiedComponentEntry<'w, 'a, T>

Ensures the entry has this component by inserting the given default if empty, and returns a mutable reference to this component in the entry.

§Examples
#[derive(Component, Default, Clone, Copy, Debug, PartialEq)]
struct Comp(u32);

let mut entity = world.spawn_empty();

entity.entry().or_insert(Comp(4));
assert_eq!(world.query::<&Comp>().single(&world).unwrap().0, 4);

entity.entry().or_insert(Comp(15)).into_mut().0 *= 2;
assert_eq!(world.query::<&Comp>().single(&world).unwrap().0, 8);
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pub fn or_insert_with<F>(self, default: F) -> OccupiedComponentEntry<'w, 'a, T>
where F: FnOnce() -> T,

Ensures the entry has this component by inserting the result of the default function if empty, and returns a mutable reference to this component in the entry.

§Examples
#[derive(Component, Default, Clone, Copy, Debug, PartialEq)]
struct Comp(u32);

let mut entity = world.spawn_empty();

entity.entry().or_insert_with(|| Comp(4));
assert_eq!(world.query::<&Comp>().single(&world).unwrap().0, 4);
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impl<'w, 'a, T> ComponentEntry<'w, 'a, T>
where T: Component + Default,

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pub fn or_default(self) -> OccupiedComponentEntry<'w, 'a, T>

Ensures the entry has this component by inserting the default value if empty, and returns a mutable reference to this component in the entry.

§Examples
#[derive(Component, Default, Clone, Copy, Debug, PartialEq)]
struct Comp(u32);

let mut entity = world.spawn_empty();

entity.entry::<Comp>().or_default();
assert_eq!(world.query::<&Comp>().single(&world).unwrap().0, 0);

Auto Trait Implementations§

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impl<'w, 'a, T> Freeze for ComponentEntry<'w, 'a, T>

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impl<'w, 'a, T> !RefUnwindSafe for ComponentEntry<'w, 'a, T>

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impl<'w, 'a, T> Send for ComponentEntry<'w, 'a, T>

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impl<'w, 'a, T> Sync for ComponentEntry<'w, 'a, T>

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impl<'w, 'a, T> Unpin for ComponentEntry<'w, 'a, T>
where T: Unpin,

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impl<'w, 'a, T> !UnwindSafe for ComponentEntry<'w, 'a, T>

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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<GpuImage>) -> 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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where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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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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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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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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where T: Any + Send,

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Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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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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Returns the argument unchanged.

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The same type as Self, used to emulate type equality bounds (T == U) with associated type equality constraints (T: Identity<Type = U>).
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Performs the conversion.
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