Trait ReadUntracked 

pub trait ReadUntracked: Sized + DefinedAt {
    type Value: Deref;

    // Required method
    fn try_read_untracked(&self) -> Option<Self::Value>;

    // Provided methods
    fn read_untracked(&self) -> Self::Value { ... }
    fn custom_try_read(&self) -> Option<Option<Self::Value>> { ... }
}

Give read-only access to a signal’s value by reference through a guard type, without tracking the value reactively.

Required Associated Types

type Value: Deref

The guard type that will be returned, which can be dereferenced to the value.

Required Methods

fn try_read_untracked(&self) -> Option<Self::Value>

Returns the guard, or None if the signal has already been disposed.

Provided Methods

fn read_untracked(&self) -> Self::Value

Returns the guard.

Panics

Panics if you try to access a signal that has been disposed.

fn custom_try_read(&self) -> Option<Option<Self::Value>>

This is a backdoor to allow overriding the Read::try_read implementation despite it being auto implemented.

If your type contains a Signal, call it’s ReadUntracked::custom_try_read here, else return None.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<Inner, Prev, K, T> ReadUntracked for AtKeyed<Inner, Prev, K, T>

where K: Clone + Debug + Send + Sync + PartialEq + Eq + Hash + 'static, KeyedSubfield<Inner, Prev, K, T>: Clone, &'a T: for<'a> IntoIterator, Inner: StoreField<Value = Prev>, Prev: 'static, T: KeyedAccess<K>, <T as KeyedAccess<K>>::Value: Sized,

type Value = <AtKeyed<Inner, Prev, K, T> as StoreField>::Reader

fn try_read_untracked( &self, ) -> Option<<AtKeyed<Inner, Prev, K, T> as ReadUntracked>::Value>

impl<Inner, Prev, K, T> ReadUntracked for KeyedSubfield<Inner, Prev, K, T>

where KeyedSubfield<Inner, Prev, K, T>: Clone, &'a T: for<'a> IntoIterator, Inner: StoreField<Value = Prev>, Prev: 'static, K: Debug + Send + Sync + PartialEq + Eq + Hash + 'static,

type Value = <KeyedSubfield<Inner, Prev, K, T> as StoreField>::Reader

fn try_read_untracked( &self, ) -> Option<<KeyedSubfield<Inner, Prev, K, T> as ReadUntracked>::Value>

impl<Inner, Prev, T> ReadUntracked for Subfield<Inner, Prev, T>

where Inner: StoreField<Value = Prev>, Prev: 'static,

type Value = <Subfield<Inner, Prev, T> as StoreField>::Reader

fn try_read_untracked( &self, ) -> Option<<Subfield<Inner, Prev, T> as ReadUntracked>::Value>

impl<Inner, Prev> ReadUntracked for AtIndex<Inner, Prev>

where Inner: StoreField<Value = Prev>, Prev: IndexMut<usize> + 'static, <Prev as Index<usize>>::Output: Sized,

type Value = <AtIndex<Inner, Prev> as StoreField>::Reader

fn try_read_untracked( &self, ) -> Option<<AtIndex<Inner, Prev> as ReadUntracked>::Value>

impl<S> ReadUntracked for DerefedField<S>

where S: StoreField, <S as StoreField>::Value: Deref + DerefMut, <<S as StoreField>::Value as Deref>::Target: Sized + 'static,

type Value = <DerefedField<S> as StoreField>::Reader

fn try_read_untracked( &self, ) -> Option<<DerefedField<S> as ReadUntracked>::Value>

impl<T, S> ReadUntracked for Field<T, S>

where S: Storage<ArcField<T>>,

type Value = StoreFieldReader<T>

fn try_read_untracked(&self) -> Option<<Field<T, S> as ReadUntracked>::Value>

impl<T, S> ReadUntracked for Store<T, S>

where T: 'static, S: Storage<ArcStore<T>>,

type Value = ReadGuard<T, Plain<T>>

fn try_read_untracked(&self) -> Option<<Store<T, S> as ReadUntracked>::Value>

impl<T> ReadUntracked for ArcField<T>

type Value = StoreFieldReader<T>

fn try_read_untracked(&self) -> Option<<ArcField<T> as ReadUntracked>::Value>

impl<T> ReadUntracked for ArcStore<T>

where T: 'static,

type Value = ReadGuard<T, Plain<T>>

fn try_read_untracked(&self) -> Option<<ArcStore<T> as ReadUntracked>::Value>

Implementors

impl<E> ReadUntracked for NodeRef<E>

where E: ElementType, <E as ElementType>::Output: JsCast + Clone + 'static,

type Value = ReadGuard<Option<<E as ElementType>::Output>, Derefable<Option<<E as ElementType>::Output>>>

impl<T, S> ReadUntracked for ArcMemo<T, S>

where T: 'static, S: Storage<T>,

type Value = ReadGuard<T, Mapped<Plain<Option<<S as Storage<T>>::Wrapped>>, T>>

impl<T, S> ReadUntracked for ArcSignal<T, S>

where S: Storage<T>,

type Value = ReadGuard<T, SignalReadGuard<T, S>>

impl<T, S> ReadUntracked for AsyncDerived<T, S>

where T: 'static, S: Storage<ArcAsyncDerived<T>>,

type Value = ReadGuard<Option<T>, Mapped<AsyncPlain<SendOption<T>>, Option<T>>>

impl<T, S> ReadUntracked for MaybeProp<T, S>

where S: Storage<Option<T>> + Storage<SignalTypes<Option<T>, S>>,

type Value = ReadGuard<Option<T>, SignalReadGuard<Option<T>, S>>

impl<T, S> ReadUntracked for MaybeSignal<T, S>

where T: Clone, S: Storage<SignalTypes<T, S>> + Storage<T>,

type Value = ReadGuard<T, SignalReadGuard<T, S>>

impl<T, S> ReadUntracked for Memo<T, S>

where T: 'static, S: Storage<ArcMemo<T, S>> + Storage<T>,

type Value = ReadGuard<T, Mapped<Plain<Option<<S as Storage<T>>::Wrapped>>, T>>

impl<T, S> ReadUntracked for ReadSignal<T, S>

where T: 'static, S: Storage<ArcReadSignal<T>>,

type Value = ReadGuard<T, Plain<T>>

impl<T, S> ReadUntracked for RwSignal<T, S>

where T: 'static, S: Storage<ArcRwSignal<T>>,

type Value = ReadGuard<T, Plain<T>>

impl<T, S> ReadUntracked for Signal<T, S>

where T: 'static, S: Storage<SignalTypes<T, S>> + Storage<T>,

type Value = ReadGuard<T, SignalReadGuard<T, S>>

impl<T, Ser> ReadUntracked for ArcOnceResource<T, Ser>

where T: 'static,

type Value = ReadGuard<Option<T>, Plain<Option<T>>>

impl<T, Ser> ReadUntracked for ArcResource<T, Ser>

where T: 'static,

type Value = <ArcAsyncDerived<T> as ReadUntracked>::Value

impl<T, Ser> ReadUntracked for OnceResource<T, Ser>

where T: Send + Sync + 'static, Ser: 'static,

type Value = ReadGuard<Option<T>, Plain<Option<T>>>

impl<T, Ser> ReadUntracked for Resource<T, Ser>

where T: Send + Sync + 'static,

type Value = <AsyncDerived<T> as ReadUntracked>::Value

impl<T> ReadUntracked for ArcAsyncDerived<T>

where T: 'static,

type Value = ReadGuard<Option<T>, Mapped<AsyncPlain<SendOption<T>>, Option<T>>>

impl<T> ReadUntracked for ArcLocalResource<T>

where T: 'static,

type Value = ReadGuard<Option<T>, Mapped<AsyncPlain<SendOption<T>>, Option<T>>>

impl<T> ReadUntracked for ArcMappedSignal<T>

type Value = DoubleDeref<Box<dyn Deref<Target = T>>>

impl<T> ReadUntracked for ArcReadSignal<T>

where T: 'static,

type Value = ReadGuard<T, Plain<T>>

impl<T> ReadUntracked for ArcRwSignal<T>

where T: 'static,

type Value = ReadGuard<T, Plain<T>>

impl<T> ReadUntracked for LocalResource<T>

where T: 'static,

type Value = ReadGuard<Option<T>, Mapped<AsyncPlain<SendOption<T>>, Option<T>>>

impl<T> ReadUntracked for MappedSignal<T>

where T: 'static,

type Value = DoubleDeref<Box<dyn Deref<Target = T>>>