Struct freya::prelude::GlobalMemo

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

A signal that can be accessed from anywhere in the application and created in a static

Implementations

impl<T> GlobalMemo<T>where T: PartialEq + 'static,

pub const fn new(selector: fn() -> T) -> GlobalMemo<T>where T: PartialEq,

Create a new global signal

pub fn signal(&self) -> ReadOnlySignal<T>

Get the signal that backs this global.

pub fn origin_scope(&self) -> ScopeId

Get the scope the signal was created in.

pub fn id(&self) -> GenerationalBoxId

Get the generational id of the signal.

Trait Implementations

impl<T> Debug for GlobalMemo<T>where T: PartialEq + Debug + 'static,

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

Formats the value using the given formatter.

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

Allow calling a signal with signal() syntax

Currently only limited to copy types, though could probably specialize for string/arc/rc

type Target = dyn Fn() -> T

The resulting type after dereferencing.

fn deref(&self) -> &<GlobalMemo<T> as Deref>::Target

Dereferences the value.

impl<T> Display for GlobalMemo<T>where T: PartialEq + Display + 'static,

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

Formats the value using the given formatter.

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

fn into_value(self) -> AttributeValue

Convert into an attribute value

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

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

This method tests for self and other values to be equal, and is used by ==.

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.

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

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

This method tests for self and other values to be equal, and is used by ==.

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.

impl<T> Readable<T> for GlobalMemo<T>where T: PartialEq + 'static,

type Ref<R: 'static + ?Sized> = GenerationalRef<Ref<'static, R>>

The type of the reference.

fn map_ref<I, U, F>( ref_: <GlobalMemo<T> as Readable<T>>::Ref<I>, f: F ) -> <GlobalMemo<T> as Readable<T>>::Ref<U>where F: FnOnce(&I) -> &U, U: ?Sized,

Map the reference to a new type.

fn try_map_ref<I, U, F>( ref_: <GlobalMemo<T> as Readable<T>>::Ref<I>, f: F ) -> Option<<GlobalMemo<T> as Readable<T>>::Ref<U>>where F: FnOnce(&I) -> Option<&U>, U: ?Sized,

Try to map the reference to a new type.

fn try_read( &self ) -> Result<<GlobalMemo<T> as Readable<T>>::Ref<T>, BorrowError>

Try to 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.

fn peek(&self) -> <GlobalMemo<T> as Readable<T>>::Ref<T>

Get the current value of the state without subscribing to updates. If the value has been dropped, this will panic.

fn read(&self) -> Self::Ref<T>

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.

fn with<O>(&self, f: impl FnOnce(&T) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.

fn with_peek<O>(&self, f: impl FnOnce(&T) -> O) -> O

Run a function with a reference to the value. If the value has been dropped, this will panic.

fn index<I>(&self, index: I) -> Self::Ref<<T as Index<I>>::Output>where T: 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.