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|
use std::any::TypeId;
use std::fmt::Debug;
use std::hash::{DefaultHasher, Hash, Hasher};
use seq_macro::seq;
pub mod component;
pub trait Event: Debug + 'static
{
/// Returns the ID of this event.
#[must_use]
fn id() -> Id
where
Self: Sized,
{
Id::new::<Self, ()>(None)
}
}
pub mod start;
/// The ID of a [`Event`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Id
{
inner: TypeId,
extra: Option<u64>,
}
impl Id
{
#[must_use]
pub fn new<EventT, Extra>(extra: Option<Extra>) -> Self
where
EventT: Event,
Extra: Hash,
{
Self {
inner: TypeId::of::<EventT>(),
extra: extra.map(|extra| {
let mut hasher = DefaultHasher::new();
extra.hash(&mut hasher);
hasher.finish()
}),
}
}
}
pub trait Ids
{
type Iter<'a>: Iterator<Item = &'a Id>
where
Self: 'a;
fn iter(&self) -> Self::Iter<'_>;
}
/// A sequence of events.
pub trait Sequence
{
type Ids: Ids;
fn ids() -> Self::Ids;
}
macro_rules! impl_sequence {
($c: tt) => {
seq!(I in 0..=$c {
impl Ids for [Id; $c + 1]
{
type Iter<'a> = std::slice::Iter<'a, Id>;
fn iter(&self) -> Self::Iter<'_> {
self.into_iter()
}
}
impl<#(Event~I: Event,)*> Sequence for (#(Event~I,)*) {
type Ids = [Id; $c + 1];
fn ids() -> Self::Ids {
[#(
Event~I::id(),
)*]
}
}
});
};
}
seq!(C in 0..=64 {
impl_sequence!(C);
});
|
