[][src]Struct moxie::Key

pub struct Key<State> { /* fields omitted */ }

A Key offers access to a state variable. The key allows reads of the state variable through a snapshot taken when the Key was created. Writes are supported with Key::update and Key::set.

They are created with the cache_state and state functions.

Implementations

impl<State> Key<State>[src]

pub fn id(&self) -> CallId[src]

Returns the topo::CallId at which the state variable is bound.

pub fn update(&self, updater: impl FnOnce(&State) -> Option<State>)[src]

Runs updater with a reference to the state variable's latest value, and enqueues a commit to the variable if updater returns Some. Returns the Revision at which the state variable was last rooted if the variable is live, otherwise returns None.

Enqueuing the commit invokes the state change waker registered with the Runtime (if any) to ensure that the code embedding the runtime schedules another call of run_once.

This should be called during event handlers or other code which executes outside of a Revision's execution, otherwise unpredictable waker behavior may be obtained.

impl<State> Key<State> where
    State: PartialEq
[src]

pub fn set(&self, new: State)[src]

Commits a new state value if it is unequal to the current value and the state variable is still live. Has the same properties as update regarding waking the runtime.

Trait Implementations

impl<State> Clone for Key<State>[src]

impl<State> Debug for Key<State> where
    State: Debug
[src]

impl<State> Deref for Key<State>[src]

type Target = State

The resulting type after dereferencing.

impl<State> Display for Key<State> where
    State: Display
[src]

impl<State> PartialEq<Key<State>> for Key<State>[src]

fn eq(&self, other: &Self) -> bool[src]

Keys are considered equal if they point to the same state variable. Importantly, they will compare as equal even if they contain different snapshots of the state variable due to having been initialized in different revisions.

Auto Trait Implementations

impl<State> !RefUnwindSafe for Key<State>

impl<State> Send for Key<State> where
    State: Send + Sync

impl<State> Sync for Key<State> where
    State: Send + Sync

impl<State> Unpin for Key<State>

impl<State> !UnwindSafe for Key<State>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Downcast for T where
    T: Any

impl<T> DowncastSync for T where
    T: Send + Sync + Any

impl<T> Erased for T

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> ToOwned for T where
    T: Clone
[src]

type Owned = T

The resulting type after obtaining ownership.

impl<T> ToString for T where
    T: Display + ?Sized
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

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

The type returned in the event of a conversion error.