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Computed

oxiui_core::reactive

Struct Computed

pub struct Computed<T: Send + Sync + Clone + 'static> { /* private fields */ }

Expand description

A lazily evaluated reactive value derived from signals or other computeds.

Computed<T> is a lightweight handle; clone it to share access to the same derived node.

Implementations§

impl<T: Send + Sync + Clone + 'static> Computed<T>

pub fn get(&self) -> Result<T, ReactiveError>

Read the current value, recomputing if stale.

If called inside another computed thunk, registers the outer computed as a dependent of this one.

§Errors

ReactiveError::Cycle — this node is already on the evaluation stack (self-referential cycle).
ReactiveError::DependencyCycle — registering a dep edge would introduce a graph cycle.
ReactiveError::TypeMismatch — the cached value cannot be downcast to T (unreachable via the public API).

Trait Implementations§

impl<T: Send + Sync + Clone + 'static> Clone for Computed<T>

fn clone(&self) -> Self

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

Auto Trait Implementations§

impl<T> Freeze for Computed<T>

impl<T> RefUnwindSafe for Computed<T>
where T: RefUnwindSafe,

impl<T> Send for Computed<T>

impl<T> Sync for Computed<T>

impl<T> Unpin for Computed<T>
where T: Unpin,

impl<T> UnsafeUnpin for Computed<T>

impl<T> UnwindSafe for Computed<T>
where T: UnwindSafe,

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> CloneToUninit for T
where T: Clone,

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

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T, U> Into<U> for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> ToOwned for T
where T: Clone,

type Owned = T

The resulting type after obtaining ownership.

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more

impl<T, U> TryFrom<U> for T
where U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.