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Provide map_ok and map_err method for Poll<Option<Result<T, E>>> #63512

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Aug 14, 2019
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Provide map_ok and map_err method for Poll<Option<Result<T, E>>> #63512

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28 changes: 28 additions & 0 deletions src/libcore/task/poll.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,34 @@ impl<T, E> Poll<Result<T, E>> {
}
}

impl<T, E> Poll<Option<Result<T, E>>> {
/// Changes the success value of this `Poll` with the closure provided.
#[unstable(feature = "poll_map", issue = "63514")]
pub fn map_ok<U, F>(self, f: F) -> Poll<Option<Result<U, E>>>
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where F: FnOnce(T) -> U
{
match self {
Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(f(t)))),
Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(e))),
Poll::Ready(None) => Poll::Ready(None),
Poll::Pending => Poll::Pending,
}
}

/// Changes the error value of this `Poll` with the closure provided.
#[unstable(feature = "poll_map", issue = "63514")]
pub fn map_err<U, F>(self, f: F) -> Poll<Option<Result<T, U>>>
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where F: FnOnce(E) -> U
{
match self {
Poll::Ready(Some(Ok(t))) => Poll::Ready(Some(Ok(t))),
Poll::Ready(Some(Err(e))) => Poll::Ready(Some(Err(f(e)))),
Poll::Ready(None) => Poll::Ready(None),
Poll::Pending => Poll::Pending,
}
}
}

#[stable(feature = "futures_api", since = "1.36.0")]
impl<T> From<T> for Poll<T> {
fn from(t: T) -> Poll<T> {
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