once::run

The once::run action executes a system exactly once and then completes. This is the most basic and versatile once action, allowing you to run any Bevy system as a one-time operation.

Usage

#![allow(unused)]
fn main() {
use bevy::prelude::*;
use bevy_flurx::prelude::*;

Reactor::schedule(|task| async move {
    task.will(Update, once::run(|world: &mut World| {
        // Your one-time logic here
    })).await;
});
}

Parameters

• system: Any valid Bevy system that can be converted using IntoSystem

Return Value

The action returns the value returned by the system.

Example: Sending an App Exit Event

#![allow(unused)]
fn main() {
use bevy::app::AppExit;
use bevy::prelude::*;
use bevy_flurx::prelude::*;

Reactor::schedule(|task| async move {
    task.will(Update, once::run(|mut ew: MessageWriter<AppExit>| {
        ew.write(AppExit::Success);
    })).await;
});
}

Example: Modifying a Resource

#![allow(unused)]
fn main() {
use bevy::prelude::*;
use bevy_flurx::prelude::*;

#[derive(Resource, Default)]
struct Score(u32);

Reactor::schedule(|task| async move {
    task.will(Update, once::run(|mut score: ResMut<Score>| {
        score.0 += 10;
    })).await;
});
}

When to Use

Use once::run when you need to:

• Execute arbitrary logic once
• Access multiple system parameters in a single action
• Return a custom value from your action

For more specific use cases, consider the specialized once actions like once::event or once::res.