Struct freya::prelude::Memo

pub struct Memo<T>
where T: 'static,
{ /* private fields */ }
Expand description

A value that is memoized. This is useful for caching the result of a computation.

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impl<T> Memo<T>
where T: 'static,

pub fn new(f: impl FnMut() -> T + 'static) -> Memo<T>
where T: PartialEq,

Create a new memo

pub fn origin_scope(&self) -> ScopeId

Get the scope that the signal was created in.

pub fn id(&self) -> GenerationalBoxId

Get the id of the signal.

Trait Implementations§

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impl<T> Clone for Memo<T>
where T: 'static,

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fn clone(&self) -> Memo<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Debug for Memo<T>
where T: Debug + 'static + PartialEq,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<T> Deref for Memo<T>
where T: Clone + PartialEq,

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type Target = dyn Fn() -> T

The resulting type after dereferencing.
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fn deref(&self) -> &<Memo<T> as Deref>::Target

Dereferences the value.
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impl<T> Display for Memo<T>
where T: Display + 'static + PartialEq,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<T> From<Memo<T>> for ReadOnlySignal<T>
where T: PartialEq,

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fn from(val: Memo<T>) -> ReadOnlySignal<T>

Converts to this type from the input type.
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impl<T> IntoAttributeValue for Memo<T>

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fn into_value(self) -> AttributeValue

Convert into an attribute value
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impl<T> IntoDynNode for Memo<T>

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fn into_dyn_node(self) -> DynamicNode

Consume this item along with a scopestate and produce a DynamicNode Read more
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impl<T> PartialEq<T> for Memo<T>
where T: PartialEq + 'static,

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fn eq(&self, other: &T) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> PartialEq for Memo<T>
where T: 'static,

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fn eq(&self, other: &Memo<T>) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<T> Readable for Memo<T>
where T: PartialEq,

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fn peek_unchecked( &self ) -> <<Memo<T> as Readable>::Storage as AnyStorage>::Ref<'static, <Memo<T> as Readable>::Target>

Get the current value of the signal. Unlike read, this will not subscribe the current scope to the signal which can cause parts of your UI to not update.

If the signal has been dropped, this will panic.

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type Target = T

The target type of the reference.
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type Storage = UnsyncStorage

The type of the storage this readable uses.
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fn try_read_unchecked( &self ) -> Result<<<Memo<T> as Readable>::Storage as AnyStorage>::Ref<'static, <Memo<T> as Readable>::Target>, BorrowError>

Try to get a reference to the value without checking the lifetime. This will subscribe the current scope to the signal. Read more
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fn map<O>( self, f: impl Fn(&Self::Target) -> &O + 'static ) -> MappedSignal<O, Self::Storage>
where Self: Sized + Clone + 'static,

Map the readable type to a new type.
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fn read(&self) -> <Self::Storage as AnyStorage>::Ref<'_, Self::Target>

Get the current value of the state. If this is a signal, this will subscribe the current scope to the signal. If the value has been dropped, this will panic. Calling this on a Signal is the same as using the signal() syntax to read and subscribe to its value
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fn try_read( &self ) -> Result<<Self::Storage as AnyStorage>::Ref<'_, Self::Target>, BorrowError>

Try to get the current value of the state. If this is a signal, this will subscribe the current scope to the signal.
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fn read_unchecked( &self ) -> <Self::Storage as AnyStorage>::Ref<'static, Self::Target>

Get a reference to the value without checking the lifetime. This will subscribe the current scope to the signal. Read more
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fn peek(&self) -> <Self::Storage as AnyStorage>::Ref<'_, Self::Target>

Get the current value of the state without subscribing to updates. If the value has been dropped, this will panic.
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fn with<O>(&self, f: impl FnOnce(&Self::Target) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.
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fn with_peek<O>(&self, f: impl FnOnce(&Self::Target) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.
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fn index<I>( &self, index: I ) -> <Self::Storage as AnyStorage>::Ref<'_, <Self::Target as Index<I>>::Output>
where Self::Target: Index<I>,

Index into the inner value and return a reference to the result. If the value has been dropped or the index is invalid, this will panic.
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impl<T> Copy for Memo<T>
where T: 'static,

Auto Trait Implementations§

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impl<T> Freeze for Memo<T>

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impl<T> !RefUnwindSafe for Memo<T>

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impl<T> !Send for Memo<T>

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impl<T> !Sync for Memo<T>

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impl<T> Unpin for Memo<T>
where T: Unpin,

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impl<T> !UnwindSafe for Memo<T>

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

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.
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fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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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.
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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.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, R> ReadableOptionExt<T> for R
where T: 'static, R: Readable<Target = Option<T>>,

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fn unwrap(&self) -> T
where T: Clone,

Unwraps the inner value and clones it.
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fn as_ref(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Attempts to read the inner value of the Option.
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impl<T, R> ReadableVecExt<T> for R
where T: 'static, R: Readable<Target = Vec<T>>,

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fn len(&self) -> usize

Returns the length of the inner vector.
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fn is_empty(&self) -> bool

Returns true if the inner vector is empty.
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fn first(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the first element of the inner vector.
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fn last(&self) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the last element of the inner vector.
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fn get(&self, index: usize) -> Option<<Self::Storage as AnyStorage>::Ref<'_, T>>

Get the element at the given index of the inner vector.
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fn iter(&self) -> ReadableValueIterator<'_, Self>
where Self: Sized,

Get an iterator over the values of the inner vector.
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, O> SuperFrom<T> for O
where O: From<T>,

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fn super_from(input: T) -> O

Convert from a type to another type.
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impl<T, O, M> SuperInto<O, M> for T
where O: SuperFrom<T, M>,

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fn super_into(self) -> O

Convert from a type to another type.
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impl<T> To for T
where T: ?Sized,

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fn to<T>(self) -> T
where Self: Into<T>,

Converts to T by calling Into<T>::into.
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fn try_to<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Tries to convert to T by calling TryInto<T>::try_into.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> ToSmolStr for T
where T: Display + ?Sized,

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fn to_smolstr(&self) -> SmolStr

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impl<T> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<Cfg> TryIntoConfig for Cfg

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fn into_config(self) -> Option<Cfg>

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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impl<T> CloneAny for T
where T: Any + Clone,

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impl<T> DependencyElement for T
where T: 'static + PartialEq + Clone,