Struct WatchedCell 

pub struct WatchedCell<T: ?Sized> { /* private fields */ }

A Watched value which provides interior mutability. This provides correct behavior (triggering watch functions when changed) where Watched<Cell<T>> would not, with lower overhead than RefCell<Watched<T>>.

Implementations

impl<T: ?Sized> WatchedCell<T>

pub fn get_mut(&mut self) -> &mut T

Returns a mutable reference to the watched data.

This call borrows the WatchedCell mutably (at compile-time) which guarantees that we possess the only reference.

pub fn watched(&self)

Treat this WatchedCell as watched, without fetching the actual value.

impl<T> WatchedCell<T>

pub fn new(value: T) -> Self

Create a new WatchedCell

pub fn set(&self, value: T)

Sets the watched value

pub fn into_inner(self) -> T

Unwraps the WatchedCell, returning the contained value

pub fn replace(&self, value: T) -> T

Replaces the contained value and returns the previous value

pub fn get(&self) -> T

where T: Copy,

Returns a copy of the watched value

pub fn take(&self) -> T

where T: Default,

Takes the watched value, leaving Default::default() in its place

Trait Implementations

impl<T: Copy> Clone for WatchedCell<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Default + ?Sized> Default for WatchedCell<T>

fn default() -> WatchedCell<T>

Returns the “default value” for a type.

impl<T> From<T> for WatchedCell<T>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T> WatchedValueCore<'static, DefaultOwner> for &WatchedCell<T>

where T: Copy,

type Value = T

fn get(self, ctx: WatchArg<'_, 'static, DefaultOwner>) -> Self::Value

fn get_unwatched(self) -> Self::Value

fn map<F, U>(self, map_fn: F) -> impl WatchedValueCore<'ctx, O, Value = U>

where Self: Sized, F: FnOnce(Self::Value) -> U,