jay-compositor 1.15.0

The Jay compositor
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#![allow(dead_code)]

use std::cell::Cell;

#[derive(Default)]
pub struct Once {
    done: Cell<bool>,
}

impl Once {
    pub fn set(&self) -> bool {
        !self.done.replace(true)
    }

    pub fn exec<F: FnOnce()>(&self, f: F) {
        if !self.done.replace(true) {
            f();
        }
    }

    async fn exec_async<G: Future<Output = ()>, F: FnOnce() -> G>(&self, f: F) {
        if !self.done.replace(true) {
            f().await;
        }
    }
}