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use {Async, Poll};
use Future;
use stream::Stream;
/// Future that forwards one element from the underlying future
/// (whether it is success of error) and emits EOF after that.
#[derive(Debug)]
pub struct IntoStream<F: Future> {
future: Option<F>
}
pub fn new<F: Future>(future: F) -> IntoStream<F> {
IntoStream {
future: Some(future)
}
}
impl<F: Future> Stream for IntoStream<F> {
type Item = F::Item;
type Error = F::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
let ret = match self.future {
None => return Ok(Async::Ready(None)),
Some(ref mut future) => {
match future.poll() {
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(e) => Err(e),
Ok(Async::Ready(r)) => Ok(r),
}
}
};
self.future = None;
ret.map(|r| Async::Ready(Some(r)))
}
}
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