Struct widgetry::Cached[−][src]

pub struct Cached<K: PartialEq + Clone, V> {
    contents: Option<(K, V)>,
}

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]

Trait Implementations

impl<K: PartialEq + Clone, V> Default for Cached<K, V>[src]

Auto Trait Implementations

impl<K, V> RefUnwindSafe for Cached<K, V> where
    K: RefUnwindSafe,
    V: RefUnwindSafe, 

impl<K, V> Send for Cached<K, V> where
    K: Send,
    V: Send, 

impl<K, V> Sync for Cached<K, V> where
    K: Sync,
    V: Sync, 

impl<K, V> Unpin for Cached<K, V> where
    K: Unpin,
    V: Unpin, 

impl<K, V> UnwindSafe for Cached<K, V> where
    K: UnwindSafe,
    V: UnwindSafe, 

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: Any + Send + Sync, 

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

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

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]

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.