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use super::{Reader, VectorReader};
use std::iter::{DoubleEndedIterator, ExactSizeIterator, FusedIterator, Iterator};
pub struct ReaderIterator<'de> {
pub(super) reader: VectorReader<'de>,
pub(super) front: usize,
end: usize,
}
impl<'de> ReaderIterator<'de> {
pub(super) fn new(reader: VectorReader<'de>) -> Self {
let end = reader.len();
ReaderIterator {
reader,
front: 0,
end,
}
}
}
impl<'de> Iterator for ReaderIterator<'de> {
type Item = Reader<'de>;
fn next(&mut self) -> Option<Self::Item> {
if self.front < self.end {
let r = self.reader.idx(self.front);
self.front += 1;
Some(r)
} else {
None
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
let remaining = self.end - self.front;
(remaining, Some(remaining))
}
}
impl<'de> DoubleEndedIterator for ReaderIterator<'de> {
fn next_back(&mut self) -> Option<Self::Item> {
if self.front < self.end {
self.end -= 1;
Some(self.reader.idx(self.end))
} else {
None
}
}
}
impl<'de> ExactSizeIterator for ReaderIterator<'de> {}
impl<'de> FusedIterator for ReaderIterator<'de> {}