Module frappe::signal

The Signal type.

Signals are values that change over time. They represent shared mutable state, but exposed in a functional way. The value can be read using the Signal::sample method. Signals do all their work on the receiver side, so they're "lazy". Operations applied on a signal are applied to the value every time the signal is sampled.

Signals are usually constructed by stream operations like Stream::hold and Stream::fold. They can also take values from a custom function by using Signal::from_fn.

Example

use frappe::Sink;

let sink = Sink::new();
let sig1 = sink.stream().fold(0, |a, n| a + *n);
let sig2 = sig1.map(|x| x + 2);

sink.send(10);
assert_eq!(sig1.sample(), 10);
assert_eq!(sig2.sample(), 12);

sink.send(30);
assert_eq!(sig1.sample(), 40);
assert_eq!(sig2.sample(), 42);

Structs

Signal

Represents a value that changes over time.