Struct Derived 

pub struct Derived<T> { /* private fields */ }

A cached value computed from other reactive values. It recomputes lazily, on the first read after a dependency changed, and notifies its own readers when that happens.

Implementations

impl<T> Derived<T>

where T: Clone + 'static,

pub fn new(compute: impl Fn() -> T + 'static) -> Derived<T>

Creates a derived value from compute, which runs on the first read.

use ravenrs_reactive::{Derived, State};

let count = State::new(2);
let c = count.clone();
let doubled = Derived::new(move || c.get() * 2);
assert_eq!(doubled.get(), 4);
count.set(5);
assert_eq!(doubled.get(), 10);

pub fn get(&self) -> T

Returns the cached value, recomputing it first if a dependency changed, and records the read.

Trait Implementations

impl<T> Clone for Derived<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T> Debug for Derived<T>

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

Formats the value using the given formatter.