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use crate::*;
pub struct EntityIterator<'tok, 'brand, 'arena, T>(Option<(lens_t!(T), lens_t!(T))>);
impl<'tok, 'brand, 'arena, T> Clone for EntityIterator<'tok, 'brand, 'arena, T> {
fn clone(&self) -> Self {
*self
}
}
impl<'tok, 'brand, 'arena, T> Copy for EntityIterator<'tok, 'brand, 'arena, T> {}
impl<'tok, 'brand, 'arena, T: Entity<'brand, 'arena>> EntityIterator<'tok, 'brand, 'arena, T> {
pub(crate) fn new(
start: Option<ptr_t!(T)>,
token: &'tok impl ReflAsRef<GhostToken<'brand>>,
) -> Self {
Self(start.map(|s| {
let l = Lens::new(s, token);
(l, l.prev())
}))
}
}
impl<'tok, 'brand, 'arena, T: Entity<'brand, 'arena>> Iterator
for EntityIterator<'tok, 'brand, 'arena, T>
{
type Item = lens_t!(T);
fn next(&mut self) -> Option<Self::Item> {
let range = self.0.as_mut()?;
let ret = range.0;
if range.0 == range.1 {
self.0 = None;
} else {
range.0 = range.0.next();
}
Some(ret)
}
}
impl<'tok, 'brand, 'arena, T: Entity<'brand, 'arena>> DoubleEndedIterator
for EntityIterator<'tok, 'brand, 'arena, T>
{
fn next_back(&mut self) -> Option<Self::Item> {
let range = self.0.as_mut()?;
let ret = range.1;
if range.0 == range.1 {
self.0 = None;
} else {
range.1 = range.1.prev();
}
Some(ret)
}
}
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