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Subscribed

waterkit_core::subscribed

Struct Subscribed 

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pub struct Subscribed<T: Clone + 'static> { /* private fields */ }
Expand description

Read-only reactive view of a value updated from any thread.

See the module-level documentation for usage.

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impl<T: Clone + 'static> Subscribed<T>

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pub const fn from_binding(binding: Binding<T>) -> Self

Constructs a Subscribed from an existing nami::Binding<T>.

Useful when adapter code already holds a binding (e.g. inside a view’s local state) and wants to expose it as the Subscribed API. The returned view shares the binding — set calls on the binding notify watchers of this view, and vice versa.

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pub const fn as_binding(&self) -> &Binding<T>

Borrows the underlying binding.

Most consumers do not need this; prefer the Signal impl. Provided for adapters that need to plug a Subscribed<T> into APIs that specifically take a &Binding<T>.

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impl<T: Clone + 'static> Subscribed<T>

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pub fn get(&self) -> T

Synchronous snapshot of the current value.

Equivalent to <Self as nami::Signal>::get(&self).

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pub fn stream(&self) -> SignalStream<Binding<T>>

Wraps as a futures::Stream<Item = T>.

Each call returns a fresh stream; multiple stream consumers are independent and each see every update after the call.

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pub fn map<U, F>(&self, f: F) -> Subscribed<U>
where U: Clone + 'static, F: Fn(T) -> U + Clone + 'static,

Lazy map: derives a new Subscribed<U> whose value is f(upstream).

Zero spawn — uses nami::Binding::mapping directly. Composing a.map(f).map(g) does not allocate forwarding tasks.

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impl<T: Clone + 'static> Clone for Subscribed<T>

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fn clone(&self) -> Self

Returns a duplicate 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<T: Debug + Clone + 'static> Debug for Subscribed<T>

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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: Clone + 'static> Signal for Subscribed<T>

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type Output = T

The type of value produced by this computation.
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type Guard = <Binding<T> as Signal>::Guard

The guard type returned by the watch method that manages watcher lifecycle.
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fn get(&self) -> T

Execute the computation and return the current value.
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fn watch(&self, watcher: impl Fn(WatcherContext<T>) + 'static) -> Self::Guard

Register a watcher to be notified when the computed value changes. Read more
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fn identity(&self) -> Option<SignalIdentity>

Returns the stable semantic identity of this signal, when one exists. Read more

Auto Trait Implementations§

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impl<T> !RefUnwindSafe for Subscribed<T>

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impl<T> !Send for Subscribed<T>

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impl<T> !Sync for Subscribed<T>

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impl<T> !UnwindSafe for Subscribed<T>

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impl<T> Freeze for Subscribed<T>
where Binding<T>: Freeze,

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impl<T> Unpin for Subscribed<T>
where Binding<T>: Unpin,

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impl<T> UnsafeUnpin for Subscribed<T>
where Binding<T>: UnsafeUnpin,

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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, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<C, F, T1, T2, Output> FlattenMap<F, (T1, T2), Output> for C
where C: Signal<Output = (T1, T2)> + 'static, F: 'static + Clone + Fn(T1, T2) -> Output, T1: 'static, T2: 'static, Output: 'static,

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fn flatten_map(&self, f: F) -> Map<C, impl Clone + Fn((T1, T2)), Output>

Maps a function over the flattened elements of a nested tuple. Read more
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impl<C, F, T1, T2, T3, Output> FlattenMap<F, (T1, T2, T3), Output> for C
where C: Signal<Output = ((T1, T2), T3)> + 'static, F: 'static + Clone + Fn(T1, T2, T3) -> Output, Output: 'static,

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fn flatten_map(&self, f: F) -> Map<C, impl Clone + Fn(((T1, T2), T3)), Output>

Maps a function over the flattened elements of a nested tuple. Read more
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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, 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<C, Output> IntoComputed<Output> for C
where C: IntoSignal<Output> + 'static, <C as IntoSignal<Output>>::Signal: Clone + 'static,

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fn into_computed(self) -> Computed<Output>

Convert this value into a Computed<Output>.

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impl<C, Output> IntoSignal<Output> for C
where C: Signal, <C as Signal>::Output: 'static + Clone, Output: From<<C as Signal>::Output> + 'static,

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fn into_signal(self) -> <C as IntoSignal<Output>>::Signal

Convert this computation into one that produces the desired output type.

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type Signal = Map<C, fn(<C as Signal>::Output) -> Output, Output>

The specific computation type that will be produced.
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impl<C> SignalExt for C
where C: Signal,

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fn map<F, Output>(&self, f: F) -> Map<Self, F, Output>
where F: 'static + Clone + Fn(Self::Output) -> Output, Output: 'static, Self: 'static,

Transforms the output of this signal using the provided function.
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fn zip<B>(&self, b: &B) -> Zip<Self, B>
where B: Signal, Self::Output: Clone, <B as Signal>::Output: Clone,

Combines this signal with another signal into a tuple.
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fn cached(&self) -> Cached<Self>
where Self::Output: Clone,

Wraps this signal with caching to avoid redundant computations.
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fn computed(&self) -> Computed<Self::Output>
where Self: 'static,

Converts this signal into a type-erased Computed container.
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fn with<T>(&self, metadata: T) -> WithMetadata<Self, T>
where T: 'static,

Attaches metadata to this signal’s watcher notifications.
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fn map_into<U>(&self) -> Map<Self, fn(Self::Output) -> U, U>
where Self: 'static, Self::Output: Into<U>, U: 'static,

Transforms the output using Into::into.
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fn inspect<F>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, Self::Output>
where Self: 'static, Self::Output: Clone + 'static, F: 'static + Clone + Fn(&Self::Output),

Applies a side-effect function and returns the original value.
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fn distinct(&self) -> Distinct<Self>
where Self::Output: PartialEq + Clone,

Creates a distinct signal that only notifies on value changes.
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fn equal_to( &self, other: Self::Output, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, Self::Output: Clone + PartialEq + 'static,

Returns true if the value equals the given value. Read more
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fn condition<F>( &self, predicate: F, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, F: 'static + Clone + Fn(&Self::Output) -> bool,

Returns true if the predicate returns true for the value.
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fn gt( &self, other: Self::Output, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, Self::Output: Clone + PartialOrd + 'static,

Returns true if the value is greater than the given value.
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fn lt( &self, other: Self::Output, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, Self::Output: Clone + PartialOrd + 'static,

Returns true if the value is less than the given value.
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fn ge( &self, other: Self::Output, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, Self::Output: Clone + PartialOrd + 'static,

Returns true if the value is greater than or equal to the given value.
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fn le( &self, other: Self::Output, ) -> Map<Self, impl Clone + Fn(Self::Output) + 'static, bool>
where Self: 'static, Self::Output: Clone + PartialOrd + 'static,

Returns true if the value is less than or equal to the given value.
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fn is_some<T>(&self) -> Map<Self, fn(Option<T>) -> bool, bool>
where Self: Signal<Output = Option<T>> + 'static, T: 'static,

Returns true if the Option is Some.
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fn is_none<T>(&self) -> Map<Self, fn(Option<T>) -> bool, bool>
where Self: Signal<Output = Option<T>> + 'static, T: 'static,

Returns true if the Option is None.
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fn unwrap_or<T>( &self, default: T, ) -> Map<Self, impl Clone + Fn(Option<T>) + 'static, T>
where Self: Signal<Output = Option<T>> + 'static, T: Clone + 'static,

Returns the contained value or a default.
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fn unwrap_or_else<T, F>( &self, default: F, ) -> Map<Self, impl Clone + Fn(Option<T>) + 'static, T>
where Self: Signal<Output = Option<T>> + 'static, T: 'static, F: 'static + Clone + Fn() -> T,

Returns the contained value or computes it from a closure.
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fn unwrap_or_default<T>(&self) -> Map<Self, fn(Option<T>) -> T, T>
where Self: Signal<Output = Option<T>> + 'static, T: Default + 'static,

Returns the contained value or the default value for that type.
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fn some_equal_to<T>( &self, value: T, ) -> Map<Self, impl Clone + Fn(Option<T>) + 'static, bool>
where Self: Signal<Output = Option<T>> + 'static, T: Clone + PartialEq + 'static,

Returns true if the Option is Some and the value equals the given value.
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fn flatten<T>(&self) -> Map<Self, fn(Option<Option<T>>) -> Option<T>, Option<T>>
where Self: Signal<Output = Option<Option<T>>> + 'static, T: 'static,

Flattens a nested Option<Option<T>> into Option<T>.
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fn map_some<T, U, F>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Option<T>) + 'static, Option<U>>
where Self: Signal<Output = Option<T>> + 'static, T: 'static, U: 'static, F: 'static + Clone + Fn(T) -> U,

Maps an Option<T> to Option<U> using the provided function.
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fn and_then_some<T, U, F>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Option<T>) + 'static, Option<U>>
where Self: Signal<Output = Option<T>> + 'static, T: 'static, U: 'static, F: 'static + Clone + Fn(T) -> Option<U>,

Returns None if the option is None, otherwise calls f with the wrapped value and returns the result.
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fn not(&self) -> Map<Self, fn(bool) -> bool, bool>
where Self: Signal<Output = bool> + 'static,

Returns the logical negation of the boolean value.
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fn and<B>(&self, other: &B) -> Map<Zip<Self, B>, fn((bool, bool)) -> bool, bool>
where Self: Signal<Output = bool> + 'static, B: Signal<Output = bool> + 'static,

Returns the logical AND of this signal with another boolean signal.
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fn or<B>(&self, other: &B) -> Map<Zip<Self, B>, fn((bool, bool)) -> bool, bool>
where Self: Signal<Output = bool> + 'static, B: Signal<Output = bool> + 'static,

Returns the logical OR of this signal with another boolean signal.
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fn then_some<T>( &self, value: T, ) -> Map<Self, impl Clone + Fn(bool) + 'static, Option<T>>
where Self: Signal<Output = bool> + 'static, T: Clone + 'static,

Returns Some(value) if true, otherwise None.
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fn select<T>( &self, if_true: T, if_false: T, ) -> Map<Self, impl Clone + Fn(bool) + 'static, T>
where Self: Signal<Output = bool> + 'static, T: Clone + 'static,

Returns if_true if true, otherwise if_false.
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fn negate<T>(&self) -> Map<Self, fn(T) -> T, T>
where Self: Signal<Output = T> + 'static, T: Signed + 'static,

Returns the negation of the value.
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fn abs<T>(&self) -> Map<Self, fn(T) -> T, T>
where Self: Signal<Output = T> + 'static, T: Signed + 'static,

Returns the absolute value.
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fn sign<T>(&self) -> Map<Self, fn(T) -> bool, bool>
where Self: Signal<Output = T> + 'static, T: Signed + 'static,

Returns true if the value is not negative (i.e., positive or zero).
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fn is_positive<T>(&self) -> Map<Self, fn(T) -> bool, bool>
where Self: Signal<Output = T> + 'static, T: Signed + 'static,

Returns true if the value is positive.
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fn is_negative<T>(&self) -> Map<Self, fn(T) -> bool, bool>
where Self: Signal<Output = T> + 'static, T: Signed + 'static,

Returns true if the value is negative.
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fn is_zero<T>(&self) -> Map<Self, fn(T) -> bool, bool>
where Self: Signal<Output = T> + 'static, T: Zero + 'static,

Returns true if the value is zero.
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fn is_ok<T, E>(&self) -> Map<Self, fn(Result<T, E>) -> bool, bool>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static,

Returns true if the Result is Ok.
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fn is_err<T, E>(&self) -> Map<Self, fn(Result<T, E>) -> bool, bool>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static,

Returns true if the Result is Err.
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fn ok<T, E>(&self) -> Map<Self, fn(Result<T, E>) -> Option<T>, Option<T>>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static,

Converts from Result<T, E> to Option<T>.
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fn err<T, E>(&self) -> Map<Self, fn(Result<T, E>) -> Option<E>, Option<E>>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static,

Converts from Result<T, E> to Option<E>.
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fn unwrap_or_result<T, E>( &self, default: T, ) -> Map<Self, impl Clone + Fn(Result<T, E>) + 'static, T>
where Self: Signal<Output = Result<T, E>> + 'static, T: Clone + 'static, E: 'static,

Returns the contained Ok value or a default.
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fn unwrap_or_else_result<T, E, F>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Result<T, E>) + 'static, T>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static, F: 'static + Clone + Fn(E) -> T,

Returns the contained Ok value or computes it from the error.
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fn map_ok<T, E, U, F>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Result<T, E>) + 'static, Result<U, E>>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static, U: 'static, F: 'static + Clone + Fn(T) -> U,

Maps a Result<T, E> to Result<U, E> using the provided function.
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fn map_err<T, E, F, U>( &self, f: F, ) -> Map<Self, impl Clone + Fn(Result<T, E>) + 'static, Result<T, U>>
where Self: Signal<Output = Result<T, E>> + 'static, T: 'static, E: 'static, U: 'static, F: 'static + Clone + Fn(E) -> U,

Maps a Result<T, E> to Result<T, F> using the provided function.
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fn debounce(&self, duration: Duration) -> Debounce<Self, DefaultExecutor>
where Self::Output: Clone,

Creates a debounced version of this signal. Read more
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fn throttle(&self, duration: Duration) -> Throttle<Self, DefaultExecutor>
where Self::Output: Clone,

Creates a throttled version of this signal. Read more
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fn str_is_empty<T>(&self) -> Map<Self, fn(T) -> bool, bool>
where Self: Signal<Output = T> + 'static, T: AsRef<str> + 'static,

Returns true if the string is empty. Read more
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fn str_len<T>(&self) -> Map<Self, fn(T) -> usize, usize>
where Self: Signal<Output = T> + 'static, T: AsRef<str> + 'static,

Returns the length of the string in bytes.
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fn str_contains<T>( &self, pattern: impl Into<String>, ) -> Map<Self, impl Clone + Fn(T) + 'static, bool>
where Self: Signal<Output = T> + 'static, T: AsRef<str> + 'static,

Returns true if the string contains the given pattern. Read more
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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 = !

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, !>

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.