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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::marker::PhantomData;
/// An event provider is able to generate a stream of events.
pub trait Provider {
type Event;
/// Get the next event.
#[must_use]
fn next_event(&mut self) -> Option<Self::Event>;
/// Determine whether there are pending events.
#[must_use]
fn has_events(&self) -> bool;
/// Construct an iterator that produces all events.
fn events(&'_ mut self) -> Iter<'_, Self, Self::Event> {
Iter::new(self)
}
}
pub struct Iter<'a, P, E>
where
P: ?Sized,
{
p: &'a mut P,
_e: PhantomData<E>,
}
impl<'a, P, E> Iter<'a, P, E>
where
P: Provider<Event = E> + ?Sized,
{
fn new(p: &'a mut P) -> Self {
Self { p, _e: PhantomData }
}
}
impl<P, E> Iterator for Iter<'_, P, E>
where
P: Provider<Event = E>,
{
type Item = E;
fn next(&mut self) -> Option<Self::Item> {
self.p.next_event()
}
}