Struct bevy_ecs::change_detection::Res

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pub struct Res<'w, T: ?Sized + Resource> { /* private fields */ }
Expand description

Shared borrow of a Resource.

See the Resource documentation for usage.

If you need a unique mutable borrow, use ResMut instead.

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Panics when used as a SystemParameter if the resource does not exist.

Use Option<Res<T>> instead if the resource might not always exist.

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impl<'w, T: Resource> Res<'w, T>

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pub fn clone(this: &Self) -> Self

Copies a reference to a resource.

Note that unless you actually need an instance of Res<T>, you should prefer to just convert it to &T which can be freely copied.

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pub fn into_inner(self) -> &'w T

Due to lifetime limitations of the Deref trait, this method can be used to obtain a reference of the Resource with a lifetime bound to 'w instead of the lifetime of the struct itself.

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impl<'w, T: Resource> AsRef<T> for Res<'w, T>

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fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.
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impl<'w, T> Debug for Res<'w, T>
where T: Debug + ?Sized + Resource,

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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<'w, T: ?Sized + Resource> Deref for Res<'w, T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<'w, T: ?Sized + Resource> DetectChanges for Res<'w, T>

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fn is_added(&self) -> bool

Returns true if this value was added after the system last ran.
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fn is_changed(&self) -> bool

Returns true if this value was added or mutably dereferenced either since the last time the system ran or, if the system never ran, since the beginning of the program. Read more
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fn last_changed(&self) -> Tick

Returns the change tick recording the time this data was most recently changed. Read more
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impl<'w, T: Resource> From<ResMut<'w, T>> for Res<'w, T>

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fn from(res: ResMut<'w, T>) -> Self

Converts to this type from the input type.
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impl<'w, 'a, T: Resource> IntoIterator for &'a Res<'w, T>

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type Item = <&'a T as IntoIterator>::Item

The type of the elements being iterated over.
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type IntoIter = <&'a T as IntoIterator>::IntoIter

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more
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impl<'a, T: Resource> SystemParam for Res<'a, T>

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type State = ComponentId

Used to store data which persists across invocations of a system.
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type Item<'w, 's> = Res<'w, T>

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>( component_id: &'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 apply_deferred.
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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 apply_deferred.
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impl<'a, T: Resource> ReadOnlySystemParam for Res<'a, T>

Auto Trait Implementations§

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impl<'w, T> Freeze for Res<'w, T>
where T: ?Sized,

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impl<'w, T> RefUnwindSafe for Res<'w, T>
where T: RefUnwindSafe + ?Sized,

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impl<'w, T> Send for Res<'w, T>
where T: ?Sized,

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impl<'w, T> Sync for Res<'w, T>
where T: ?Sized,

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impl<'w, T> Unpin for Res<'w, T>
where T: ?Sized,

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impl<'w, T> UnwindSafe for Res<'w, T>
where T: RefUnwindSafe + ?Sized,

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> 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 + Sync + Send>

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<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<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,