Struct freya::prelude::Comparer

pub struct Comparer<R, S = UnsyncStorage>where
    R: 'static,
    S: Storage<SignalData<bool>>,{ /* private fields */ }

An object that can efficiently compare a value to a set of values.

Implementations

impl<R> Comparer<R>where R: Eq + Hash,

pub fn new(f: impl FnMut() -> R + 'static) -> Comparer<R>

Creates a new Comparer which efficiently tracks when a value changes to check if it is equal to a set of values.

Generally, you shouldn’t need to use this hook. Instead you can use crate::use_memo. If you have many values that you need to compare to a single value, this hook will change updates from O(n) to O(1) where n is the number of values you are comparing to.

impl<R, S> Comparer<R, S>where R: Eq + Hash, S: Storage<SignalData<bool>>,

pub fn new_maybe_sync(f: impl FnMut() -> R + 'static) -> Comparer<R>

Creates a new Comparer that may be Sync + Send which efficiently tracks when a value changes to check if it is equal to a set of values.

Generally, you shouldn’t need to use this hook. Instead you can use crate::use_memo. If you have many values that you need to compare to a single value, this hook will change updates from O(n) to O(1) where n is the number of values you are comparing to.

pub fn equal(&self, value: R) -> ReadOnlySignal<bool, S>

Returns a signal which is true when the value is equal to the value passed to this function.

Trait Implementations

impl<R, S> Clone for Comparer<R, S>where S: Storage<SignalData<bool>>,

fn clone(&self) -> Comparer<R, S>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<R, S> Debug for Comparer<R, S>where R: Debug + 'static, S: Debug + Storage<SignalData<bool>>,

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

Formats the value using the given formatter.

impl<R, S> Copy for Comparer<R, S>where S: Storage<SignalData<bool>>,