use crate::*;

pub trait Exit: Send {
    fn exited (&self) -> bool;
    fn exit (&mut self);
    fn boxed (self) -> Box<dyn Exit> where Self: Sized + 'static {
        Box::new(self)
    }
}

#[macro_export] macro_rules! exit {
    ($T:ty) => {
        impl Exit for $T {
            fn exited (&self) -> bool {
                self.exited
            }
            fn exit (&mut self) {
                self.exited = true
            }
        }
    }
}

/// Marker trait for [Component]s that can [Exit]
pub trait ExitableComponent<E>: Exit + Component<E> where E: Engine {
    /// Perform type erasure for collecting heterogeneous components.
    fn boxed (self) -> Box<dyn ExitableComponent<E>> where Self: Sized + 'static {
        Box::new(self)
    }
}

impl<E: Engine, C: Component<E> + Exit> ExitableComponent<E> for C {}