Trait futures_option::OptionExt

pub trait OptionExt<T>: Sized {
    fn next(&mut self) -> Next<T>
    where
        T: Stream + Unpin;
    fn select_next_some(&mut self) -> SelectNextSome<T>
    where
        T: Stream + Unpin;
    fn current(&mut self) -> Current<T>
    where
        T: Future + Unpin;
}

Extension methods for Option of Streams or Futures.

Required methods

Important traits for Next<'a, T>

impl<'a, T> Future for Next<'a, T> where
    T: Stream + Unpin,  type Output = Option<T::Item>;

fn next(&mut self) -> Next<T> where
    T: Stream + Unpin, 

Convert Option into a Future that resolves to the next item in the Stream.

If the Option is None, the returned future also resolves to None.

Important traits for SelectNextSome<'a, T>

impl<'a, T> Future for SelectNextSome<'a, T> where
    T: Stream + Unpin,  type Output = T::Item;

fn select_next_some(&mut self) -> SelectNextSome<T> where
    T: Stream + Unpin, 

Returns a Future that resolves when the next item in this stream is ready.

If the Option is None, the returned future will always be pending.

Important traits for Current<'a, T>

impl<'a, T> Future for Current<'a, T> where
    T: Future + Unpin,  type Output = T::Output;

fn current(&mut self) -> Current<T> where
    T: Future + Unpin, 

Convert Option into a Future that resolves to the same value as the stored Future.

If the Option is None, the returned future also resolves to None.

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Implementations on Foreign Types

impl<T> OptionExt<T> for Option<T>

Important traits for Next<'a, T>

impl<'a, T> Future for Next<'a, T> where
    T: Stream + Unpin,  type Output = Option<T::Item>;

fn next(&mut self) -> Next<T> where
    T: Stream + Unpin, 

Important traits for SelectNextSome<'a, T>

impl<'a, T> Future for SelectNextSome<'a, T> where
    T: Stream + Unpin,  type Output = T::Item;

fn select_next_some(&mut self) -> SelectNextSome<T> where
    T: Stream + Unpin, 

Important traits for Current<'a, T>

impl<'a, T> Future for Current<'a, T> where
    T: Future + Unpin,  type Output = T::Output;

fn current(&mut self) -> Current<T> where
    T: Future + Unpin, 

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Implementors

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