pub use std::sync::mpsc::TryRecvError;
use std::sync::mpsc::{self, Receiver};

pub struct Loader<T> {
    rx: Receiver<T>,
}

impl<T: Send + 'static> Loader<T> {
    pub fn new<F: FnOnce() -> T + Send + 'static>(f: F) -> Loader<T> {
        let (tx, rx) = mpsc::sync_channel(0);
        std::thread::spawn(move || tx.send(f()).unwrap());
        return Loader { rx };
    }
    #[inline(always)]
    pub fn try_recv(&self) -> Result<T, TryRecvError> {
        self.rx.try_recv()
    }
}