use core::marker::PhantomData;
use {Poll, Async};
use stream::Stream;
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Results<S: Stream, E> {
inner: S,
phantom: PhantomData<E>
}
pub fn new<S, E>(s: S) -> Results<S, E> where S: Stream {
Results {
inner: s,
phantom: PhantomData
}
}
impl<S: Stream, E> Stream for Results<S, E> {
type Item = Result<S::Item, S::Error>;
type Error = E;
fn poll(&mut self) -> Poll<Option<Result<S::Item, S::Error>>, E> {
match self.inner.poll() {
Ok(Async::Ready(Some(item))) => Ok(Async::Ready(Some(Ok(item)))),
Err(e) => Ok(Async::Ready(Some(Err(e)))),
Ok(Async::Ready(None)) => Ok(Async::Ready(None)),
Ok(Async::NotReady) => Ok(Async::NotReady)
}
}
}