Struct silkenweb_reactive::signal::ReadSignal [−][src]
pub struct ReadSignal<T>(_);
Receive changes from a signal.
Changes will stop being received when this is destroyed:
let x = Signal::new(1); let seen_by_y = Rc::new(Cell::new(0)); let y = x.read().map({ clone!(seen_by_y); move|&x| seen_by_y.set(x) }); assert_eq!(seen_by_y.get(), 1); x.write().set(2); assert_eq!(seen_by_y.get(), 2); mem::drop(y); // We won't see this update x.write().set(3); assert_eq!(seen_by_y.get(), 2);
Implementations
impl<T: 'static> ReadSignal<T>
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impl<T: 'static> ReadSignal<T>
[src]pub fn current(&self) -> Ref<'_, T>
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The current value of the signal
pub fn only_changes(&self) -> ReadSignal<T> where
T: Clone + Eq,
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T: Clone + Eq,
Only propagate actual changes to the signal value.
let all_updates_count = Rc::new(Cell::new(0)); let only_changes_count = Rc::new(Cell::new(0)); let x = Signal::new(0); let all_updates = x.read().map({ clone!(all_updates_count); move |_| all_updates_count.set(all_updates_count.get() + 1) }); let only_changes = x.read().only_changes().map({ clone!(only_changes_count); move |_| only_changes_count.set(only_changes_count.get() + 1) }); x.write().set(1); x.write().set(1); assert_eq!(all_updates_count.get(), 3, "One for init + 2 updates"); assert_eq!(only_changes_count.get(), 2, "One for init + 1 actual change");
pub fn map<Output, Generate>(&self, generate: Generate) -> ReadSignal<Output> where
Output: 'static,
Generate: 'static + Fn(&T) -> Output,
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Output: 'static,
Generate: 'static + Fn(&T) -> Output,
Map a function onto the inner value to produce a new ReadSignal
.
This only exists to make type inference easier, and just forwards its
arguments to map_to
.
pub fn map_to<Output>(
&self,
receiver: impl SignalReceiver<T, Output>
) -> ReadSignal<Output> where
Output: 'static,
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&self,
receiver: impl SignalReceiver<T, Output>
) -> ReadSignal<Output> where
Output: 'static,
Receive changes to a signal.
Trait Implementations
impl<T> Clone for ReadSignal<T>
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impl<T> Clone for ReadSignal<T>
[src]fn clone(&self) -> Self
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pub fn clone_from(&mut self, source: &Self)
1.0.0[src]
Auto Trait Implementations
impl<T> !RefUnwindSafe for ReadSignal<T>
impl<T> !RefUnwindSafe for ReadSignal<T>
impl<T> !Send for ReadSignal<T>
impl<T> !Send for ReadSignal<T>
impl<T> !Sync for ReadSignal<T>
impl<T> !Sync for ReadSignal<T>
impl<T> Unpin for ReadSignal<T>
impl<T> Unpin for ReadSignal<T>
impl<T> !UnwindSafe for ReadSignal<T>
impl<T> !UnwindSafe for ReadSignal<T>