use std::any::TypeId;
use std::fmt::Debug;
use std::hash::Hash;

pub trait Event: Debug + 'static
{
    fn id(&self) -> Id;
}

/// The ID of a [`Event`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Id
{
    inner: TypeId,
}

impl Id
{
    /// Returns the id of a [`Event`];
    pub fn of<EventT: Event>() -> Self
    {
        Self { inner: TypeId::of::<EventT>() }
    }
}