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use super::assert_stream;
use core::pin::Pin;
use futures_core::stream::Stream;
use futures_core::task::{Context, Poll};
#[derive(Debug, Clone)]
#[must_use = "streams do nothing unless polled"]
pub struct Iter<I> {
iter: I,
}
impl<I> Unpin for Iter<I> {}
pub fn iter<I>(i: I) -> Iter<I::IntoIter>
where I: IntoIterator,
{
assert_stream::<I::Item, _>(Iter {
iter: i.into_iter(),
})
}
impl<I> Stream for Iter<I>
where I: Iterator,
{
type Item = I::Item;
fn poll_next(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<I::Item>> {
Poll::Ready(self.iter.next())
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.iter.size_hint()
}
}