[−][src]Struct widgetry::Cached
Store a cached key/value pair, only recalculating when the key changes.
Fields
contents: Option<(K, V)>Implementations
impl<K: PartialEq + Clone, V> Cached<K, V>[src]
pub fn new() -> Cached<K, V>[src]
pub fn key(&self) -> Option<K>[src]
Get the current key.
pub fn value(&self) -> Option<&V>[src]
Get the current value.
pub fn update<F: FnMut(K) -> V>(&mut self, key: Option<K>, produce_value: F)[src]
Update the value if the key has changed.
pub fn clear(&mut self)[src]
Auto Trait Implementations
impl<K, V> RefUnwindSafe for Cached<K, V> where
K: RefUnwindSafe,
V: RefUnwindSafe,
K: RefUnwindSafe,
V: RefUnwindSafe,
impl<K, V> Send for Cached<K, V> where
K: Send,
V: Send,
K: Send,
V: Send,
impl<K, V> Sync for Cached<K, V> where
K: Sync,
V: Sync,
K: Sync,
V: Sync,
impl<K, V> Unpin for Cached<K, V> where
K: Unpin,
V: Unpin,
K: Unpin,
V: Unpin,
impl<K, V> UnwindSafe for Cached<K, V> where
K: UnwindSafe,
V: UnwindSafe,
K: UnwindSafe,
V: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized, [src]
T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized, [src]
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized, [src]
T: ?Sized,
fn borrow_mut(&mut self) -> &mut T[src]
impl<T> Downcast for T where
T: Any,
T: Any,
fn into_any(self: Box<T>) -> Box<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
impl<T> DowncastSync for T where
T: Send + Sync + Any,
T: Send + Sync + Any,
impl<T> From<T> for T[src]
impl<T, U> Into<U> for T where
U: From<T>, [src]
U: From<T>,
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<T, U> TryFrom<U> for T where
U: Into<T>, [src]
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>[src]
impl<T, U> TryInto<U> for T where
U: TryFrom<T>, [src]
U: TryFrom<T>,