Struct widgetry::Cached[−][src]

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

Expand description

Store a cached key/value pair, only recalculating when the key changes.

Fields

contents: Option<(K, V)>

Implementations

Get the current key.

pub fn value(&self) -> Option<&V>

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Get the current value.

pub fn update<F: FnMut(K) -> V>(&mut self, key: Option<K>, produce_value: F)

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Update the value if the key has changed.

pub fn clear(&mut self)

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Trait Implementations

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

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fn default() -> Self

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Returns the “default value” for a type. Read more

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,

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pub fn type_id(&self) -> TypeId

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Gets the TypeId of self. Read more

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

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pub fn borrow(&self) -> &T

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Immutably borrows from an owned value. Read more

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

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

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Mutably borrows from an owned value. Read more

impl<T> Downcast for T where
T: Any,

pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more

pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more

pub fn as_any(&self) -> &(dyn Any + 'static)

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more

pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more

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

pub fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + 'static + Send + Sync>

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

impl<T> From<T> for T

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pub fn from(t: T) -> T

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Performs the conversion.

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

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pub fn into(self) -> U

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Performs the conversion.

impl<T> Same<T> for T

type Output = T

Should always be Self

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

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type Error = Infallible

The type returned in the event of a conversion error.

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

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Performs the conversion.

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

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type Error = >::Error

The type returned in the event of a conversion error.

pub fn try_into(self) -> Result<U, >::Error>

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Performs the conversion.

Struct widgetry::Cached[−][src]

Fields

Implementations

impl<K: PartialEq + Clone, V> Cached<K, V>

pub fn new() -> Cached<K, V>

pub fn key(&self) -> Option<K>

pub fn value(&self) -> Option<&V>

pub fn update<F: FnMut(K) -> V>(&mut self, key: Option<K>, produce_value: F)

pub fn clear(&mut self)

Trait Implementations

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

fn default() -> Self

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,

pub fn type_id(&self) -> TypeId

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

pub fn borrow(&self) -> &T

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

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

impl<T> Downcast for T where T: Any,

pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>

pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>

pub fn as_any(&self) -> &(dyn Any + 'static)

pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

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

pub fn into_any_arc(self: Arc<T>) -> Arc<dyn Any + 'static + Send + Sync>

impl<T> From<T> for T

pub fn from(t: T) -> T

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

pub fn into(self) -> U

impl<T> Same<T> for T

type Output = T

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

type Error = Infallible

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

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

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

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

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,

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

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

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

impl<T> Downcast for T where
T: Any,

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

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

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

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