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use {Poll, Async};
use stream::Stream;
#[must_use = "streams do nothing unless polled"]
pub struct Skip<S> {
stream: S,
remaining: u64,
}
pub fn new<S>(s: S, amt: u64) -> Skip<S>
where S: Stream,
{
Skip {
stream: s,
remaining: amt,
}
}
impl<S> Stream for Skip<S>
where S: Stream,
{
type Item = S::Item;
type Error = S::Error;
fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
while self.remaining > 0 {
match try_ready!(self.stream.poll()) {
Some(_) => self.remaining -= 1,
None => return Ok(Async::Ready(None)),
}
}
self.stream.poll()
}
}